* [PATCH v2 2/4] x86: split PV dom0 builder to pv/dom0_builder.c
2017-03-16 17:54 [PATCH v2 0/4] Refactor x86 dom0 builder Wei Liu
2017-03-16 17:54 ` [PATCH v2 1/4] x86: rename domain_build.c to dom0_build.c Wei Liu
@ 2017-03-16 17:54 ` Wei Liu
2017-03-16 18:12 ` Roger Pau Monné
` (2 more replies)
2017-03-16 17:54 ` [PATCH v2 3/4] x86: split PVH dom0 builder to hvm/dom0_build.c Wei Liu
2017-03-16 17:54 ` [PATCH v2 4/4] x86: clean up header files in dom0_build.c Wei Liu
3 siblings, 3 replies; 18+ messages in thread
From: Wei Liu @ 2017-03-16 17:54 UTC (permalink / raw)
To: Xen-devel; +Cc: Andrew Cooper, Wei Liu, Jan Beulich, Roger Pau Monné
Long term we want to be able to disentangle PV and HVM code. Move the PV
domain builder to a dedicated file.
This in turn requires exposing a few functions and variables via a new
header dom0_build.h. These functions and variables are now prefixed with
"dom0_" if they weren't already so.
No functional change.
Signed-off-by: Wei Liu <wei.liu2@citrix.com>
---
v2:
1. put file under pv directory
2. use dom0_ prefix
3. header now in asm-x86
---
xen/arch/x86/dom0_build.c | 911 +--------------------------------------
xen/arch/x86/pv/Makefile | 1 +
xen/arch/x86/pv/dom0_build.c | 910 ++++++++++++++++++++++++++++++++++++++
xen/include/asm-x86/dom0_build.h | 32 ++
4 files changed, 960 insertions(+), 894 deletions(-)
create mode 100644 xen/arch/x86/pv/dom0_build.c
create mode 100644 xen/include/asm-x86/dom0_build.h
diff --git a/xen/arch/x86/dom0_build.c b/xen/arch/x86/dom0_build.c
index 1c723c9ef1..c74f9b52e0 100644
--- a/xen/arch/x86/dom0_build.c
+++ b/xen/arch/x86/dom0_build.c
@@ -28,6 +28,7 @@
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/desc.h>
+#include <asm/dom0_build.h>
#include <asm/i387.h>
#include <asm/paging.h>
#include <asm/p2m.h>
@@ -154,11 +155,11 @@ static void __init parse_dom0_nodes(const char *s)
}
custom_param("dom0_nodes", parse_dom0_nodes);
-static cpumask_t __initdata dom0_cpus;
+cpumask_t __initdata dom0_cpus;
-static struct vcpu *__init setup_dom0_vcpu(struct domain *d,
- unsigned int vcpu_id,
- unsigned int cpu)
+struct vcpu *__init dom0_setup_vcpu(struct domain *d,
+ unsigned int vcpu_id,
+ unsigned int cpu)
{
struct vcpu *v = alloc_vcpu(d, vcpu_id, cpu);
@@ -215,7 +216,7 @@ struct vcpu *__init alloc_dom0_vcpu0(struct domain *dom0)
return NULL;
dom0->max_vcpus = max_vcpus;
- return setup_dom0_vcpu(dom0, 0, cpumask_first(&dom0_cpus));
+ return dom0_setup_vcpu(dom0, 0, cpumask_first(&dom0_cpus));
}
#ifdef CONFIG_SHADOW_PAGING
@@ -258,66 +259,7 @@ string_param("dom0_ioports_disable", opt_dom0_ioports_disable);
static bool_t __initdata ro_hpet = 1;
boolean_param("ro-hpet", ro_hpet);
-/* Allow ring-3 access in long mode as guest cannot use ring 1 ... */
-#define BASE_PROT (_PAGE_PRESENT|_PAGE_RW|_PAGE_ACCESSED|_PAGE_USER)
-#define L1_PROT (BASE_PROT|_PAGE_GUEST_KERNEL)
-/* ... except for compatibility mode guests. */
-#define COMPAT_L1_PROT (_PAGE_PRESENT|_PAGE_RW|_PAGE_ACCESSED)
-#define L2_PROT (BASE_PROT|_PAGE_DIRTY)
-#define L3_PROT (BASE_PROT|_PAGE_DIRTY)
-#define L4_PROT (BASE_PROT|_PAGE_DIRTY)
-
-static unsigned int __initdata memflags = MEMF_no_dma|MEMF_exact_node;
-
-static struct page_info * __init alloc_chunk(
- struct domain *d, unsigned long max_pages)
-{
- static unsigned int __initdata last_order = MAX_ORDER;
- struct page_info *page;
- unsigned int order = get_order_from_pages(max_pages), free_order;
-
- if ( order > last_order )
- order = last_order;
- else if ( max_pages & (max_pages - 1) )
- --order;
- while ( (page = alloc_domheap_pages(d, order, memflags)) == NULL )
- if ( order-- == 0 )
- break;
- if ( page )
- last_order = order;
- else if ( memflags )
- {
- /*
- * Allocate up to 2MB at a time: It prevents allocating very large
- * chunks from DMA pools before the >4GB pool is fully depleted.
- */
- last_order = 21 - PAGE_SHIFT;
- memflags = 0;
- return alloc_chunk(d, max_pages);
- }
-
- /*
- * Make a reasonable attempt at finding a smaller chunk at a higher
- * address, to avoid allocating from low memory as much as possible.
- */
- for ( free_order = order; !memflags && page && order--; )
- {
- struct page_info *pg2;
-
- if ( d->tot_pages + (1 << order) > d->max_pages )
- continue;
- pg2 = alloc_domheap_pages(d, order, MEMF_exact_node);
- if ( pg2 > page )
- {
- free_domheap_pages(page, free_order);
- page = pg2;
- free_order = order;
- }
- else if ( pg2 )
- free_domheap_pages(pg2, order);
- }
- return page;
-}
+unsigned int __initdata dom0_memflags = MEMF_no_dma|MEMF_exact_node;
static unsigned long __init dom0_paging_pages(const struct domain *d,
unsigned long nr_pages)
@@ -330,7 +272,7 @@ static unsigned long __init dom0_paging_pages(const struct domain *d,
return ((memkb + 1023) / 1024) << (20 - PAGE_SHIFT);
}
-static unsigned long __init compute_dom0_nr_pages(
+unsigned long __init dom0_compute_nr_pages(
struct domain *d, struct elf_dom_parms *parms, unsigned long initrd_len)
{
nodeid_t node;
@@ -467,199 +409,7 @@ static void __init process_dom0_ioports_disable(struct domain *dom0)
}
}
-static __init void dom0_update_physmap(struct domain *d, unsigned long pfn,
- unsigned long mfn, unsigned long vphysmap_s)
-{
- if ( !is_pv_32bit_domain(d) )
- ((unsigned long *)vphysmap_s)[pfn] = mfn;
- else
- ((unsigned int *)vphysmap_s)[pfn] = mfn;
-
- set_gpfn_from_mfn(mfn, pfn);
-}
-
-static __init void mark_pv_pt_pages_rdonly(struct domain *d,
- l4_pgentry_t *l4start,
- unsigned long vpt_start,
- unsigned long nr_pt_pages)
-{
- unsigned long count;
- struct page_info *page;
- l4_pgentry_t *pl4e;
- l3_pgentry_t *pl3e;
- l2_pgentry_t *pl2e;
- l1_pgentry_t *pl1e;
-
- pl4e = l4start + l4_table_offset(vpt_start);
- pl3e = l4e_to_l3e(*pl4e);
- pl3e += l3_table_offset(vpt_start);
- pl2e = l3e_to_l2e(*pl3e);
- pl2e += l2_table_offset(vpt_start);
- pl1e = l2e_to_l1e(*pl2e);
- pl1e += l1_table_offset(vpt_start);
- for ( count = 0; count < nr_pt_pages; count++ )
- {
- l1e_remove_flags(*pl1e, _PAGE_RW);
- page = mfn_to_page(l1e_get_pfn(*pl1e));
-
- /* Read-only mapping + PGC_allocated + page-table page. */
- page->count_info = PGC_allocated | 3;
- page->u.inuse.type_info |= PGT_validated | 1;
-
- /* Top-level p.t. is pinned. */
- if ( (page->u.inuse.type_info & PGT_type_mask) ==
- (!is_pv_32bit_domain(d) ?
- PGT_l4_page_table : PGT_l3_page_table) )
- {
- page->count_info += 1;
- page->u.inuse.type_info += 1 | PGT_pinned;
- }
-
- /* Iterate. */
- if ( !((unsigned long)++pl1e & (PAGE_SIZE - 1)) )
- {
- if ( !((unsigned long)++pl2e & (PAGE_SIZE - 1)) )
- {
- if ( !((unsigned long)++pl3e & (PAGE_SIZE - 1)) )
- pl3e = l4e_to_l3e(*++pl4e);
- pl2e = l3e_to_l2e(*pl3e);
- }
- pl1e = l2e_to_l1e(*pl2e);
- }
- }
-}
-
-static __init void setup_pv_physmap(struct domain *d, unsigned long pgtbl_pfn,
- unsigned long v_start, unsigned long v_end,
- unsigned long vphysmap_start,
- unsigned long vphysmap_end,
- unsigned long nr_pages)
-{
- struct page_info *page = NULL;
- l4_pgentry_t *pl4e, *l4start = map_domain_page(_mfn(pgtbl_pfn));
- l3_pgentry_t *pl3e = NULL;
- l2_pgentry_t *pl2e = NULL;
- l1_pgentry_t *pl1e = NULL;
-
- if ( v_start <= vphysmap_end && vphysmap_start <= v_end )
- panic("DOM0 P->M table overlaps initial mapping");
-
- while ( vphysmap_start < vphysmap_end )
- {
- if ( d->tot_pages + ((round_pgup(vphysmap_end) - vphysmap_start)
- >> PAGE_SHIFT) + 3 > nr_pages )
- panic("Dom0 allocation too small for initial P->M table");
-
- if ( pl1e )
- {
- unmap_domain_page(pl1e);
- pl1e = NULL;
- }
- if ( pl2e )
- {
- unmap_domain_page(pl2e);
- pl2e = NULL;
- }
- if ( pl3e )
- {
- unmap_domain_page(pl3e);
- pl3e = NULL;
- }
- pl4e = l4start + l4_table_offset(vphysmap_start);
- if ( !l4e_get_intpte(*pl4e) )
- {
- page = alloc_domheap_page(d, 0);
- if ( !page )
- break;
-
- /* No mapping, PGC_allocated + page-table page. */
- page->count_info = PGC_allocated | 2;
- page->u.inuse.type_info = PGT_l3_page_table | PGT_validated | 1;
- pl3e = __map_domain_page(page);
- clear_page(pl3e);
- *pl4e = l4e_from_page(page, L4_PROT);
- } else
- pl3e = map_domain_page(_mfn(l4e_get_pfn(*pl4e)));
-
- pl3e += l3_table_offset(vphysmap_start);
- if ( !l3e_get_intpte(*pl3e) )
- {
- if ( cpu_has_page1gb &&
- !(vphysmap_start & ((1UL << L3_PAGETABLE_SHIFT) - 1)) &&
- vphysmap_end >= vphysmap_start + (1UL << L3_PAGETABLE_SHIFT) &&
- (page = alloc_domheap_pages(d,
- L3_PAGETABLE_SHIFT - PAGE_SHIFT,
- 0)) != NULL )
- {
- *pl3e = l3e_from_page(page, L1_PROT|_PAGE_DIRTY|_PAGE_PSE);
- vphysmap_start += 1UL << L3_PAGETABLE_SHIFT;
- continue;
- }
- if ( (page = alloc_domheap_page(d, 0)) == NULL )
- break;
-
- /* No mapping, PGC_allocated + page-table page. */
- page->count_info = PGC_allocated | 2;
- page->u.inuse.type_info = PGT_l2_page_table | PGT_validated | 1;
- pl2e = __map_domain_page(page);
- clear_page(pl2e);
- *pl3e = l3e_from_page(page, L3_PROT);
- }
- else
- pl2e = map_domain_page(_mfn(l3e_get_pfn(*pl3e)));
-
- pl2e += l2_table_offset(vphysmap_start);
- if ( !l2e_get_intpte(*pl2e) )
- {
- if ( !(vphysmap_start & ((1UL << L2_PAGETABLE_SHIFT) - 1)) &&
- vphysmap_end >= vphysmap_start + (1UL << L2_PAGETABLE_SHIFT) &&
- (page = alloc_domheap_pages(d,
- L2_PAGETABLE_SHIFT - PAGE_SHIFT,
- 0)) != NULL )
- {
- *pl2e = l2e_from_page(page, L1_PROT|_PAGE_DIRTY|_PAGE_PSE);
- if ( opt_allow_superpage )
- get_superpage(page_to_mfn(page), d);
- vphysmap_start += 1UL << L2_PAGETABLE_SHIFT;
- continue;
- }
- if ( (page = alloc_domheap_page(d, 0)) == NULL )
- break;
-
- /* No mapping, PGC_allocated + page-table page. */
- page->count_info = PGC_allocated | 2;
- page->u.inuse.type_info = PGT_l1_page_table | PGT_validated | 1;
- pl1e = __map_domain_page(page);
- clear_page(pl1e);
- *pl2e = l2e_from_page(page, L2_PROT);
- }
- else
- pl1e = map_domain_page(_mfn(l2e_get_pfn(*pl2e)));
-
- pl1e += l1_table_offset(vphysmap_start);
- BUG_ON(l1e_get_intpte(*pl1e));
- page = alloc_domheap_page(d, 0);
- if ( !page )
- break;
-
- *pl1e = l1e_from_page(page, L1_PROT|_PAGE_DIRTY);
- vphysmap_start += PAGE_SIZE;
- vphysmap_start &= PAGE_MASK;
- }
- if ( !page )
- panic("Not enough RAM for DOM0 P->M table");
-
- if ( pl1e )
- unmap_domain_page(pl1e);
- if ( pl2e )
- unmap_domain_page(pl2e);
- if ( pl3e )
- unmap_domain_page(pl3e);
-
- unmap_domain_page(l4start);
-}
-
-static int __init setup_permissions(struct domain *d)
+int __init dom0_setup_permissions(struct domain *d)
{
unsigned long mfn;
unsigned int i;
@@ -741,633 +491,6 @@ static int __init setup_permissions(struct domain *d)
return rc;
}
-static int __init construct_dom0_pv(
- struct domain *d,
- const module_t *image, unsigned long image_headroom,
- module_t *initrd,
- void *(*bootstrap_map)(const module_t *),
- char *cmdline)
-{
- int i, cpu, rc, compatible, compat32, order, machine;
- struct cpu_user_regs *regs;
- unsigned long pfn, mfn;
- unsigned long nr_pages;
- unsigned long nr_pt_pages;
- unsigned long alloc_spfn;
- unsigned long alloc_epfn;
- unsigned long initrd_pfn = -1, initrd_mfn = 0;
- unsigned long count;
- struct page_info *page = NULL;
- start_info_t *si;
- struct vcpu *v = d->vcpu[0];
- unsigned long long value;
- void *image_base = bootstrap_map(image);
- unsigned long image_len = image->mod_end;
- void *image_start = image_base + image_headroom;
- unsigned long initrd_len = initrd ? initrd->mod_end : 0;
- l4_pgentry_t *l4tab = NULL, *l4start = NULL;
- l3_pgentry_t *l3tab = NULL, *l3start = NULL;
- l2_pgentry_t *l2tab = NULL, *l2start = NULL;
- l1_pgentry_t *l1tab = NULL, *l1start = NULL;
-
- /*
- * This fully describes the memory layout of the initial domain. All
- * *_start address are page-aligned, except v_start (and v_end) which are
- * superpage-aligned.
- */
- struct elf_binary elf;
- struct elf_dom_parms parms;
- unsigned long vkern_start;
- unsigned long vkern_end;
- unsigned long vinitrd_start;
- unsigned long vinitrd_end;
- unsigned long vphysmap_start;
- unsigned long vphysmap_end;
- unsigned long vstartinfo_start;
- unsigned long vstartinfo_end;
- unsigned long vstack_start;
- unsigned long vstack_end;
- unsigned long vpt_start;
- unsigned long vpt_end;
- unsigned long v_start;
- unsigned long v_end;
-
- /* Machine address of next candidate page-table page. */
- paddr_t mpt_alloc;
-
- printk("*** LOADING DOMAIN 0 ***\n");
-
- d->max_pages = ~0U;
-
- if ( (rc = bzimage_parse(image_base, &image_start, &image_len)) != 0 )
- return rc;
-
- if ( (rc = elf_init(&elf, image_start, image_len)) != 0 )
- return rc;
-#ifdef CONFIG_VERBOSE_DEBUG
- elf_set_verbose(&elf);
-#endif
- elf_parse_binary(&elf);
- if ( (rc = elf_xen_parse(&elf, &parms)) != 0 )
- goto out;
-
- /* compatibility check */
- compatible = 0;
- compat32 = 0;
- machine = elf_uval(&elf, elf.ehdr, e_machine);
- printk(" Xen kernel: 64-bit, lsb, compat32\n");
- if (elf_32bit(&elf) && parms.pae == XEN_PAE_BIMODAL)
- parms.pae = XEN_PAE_EXTCR3;
- if (elf_32bit(&elf) && parms.pae && machine == EM_386)
- {
- compat32 = 1;
- compatible = 1;
- }
- if (elf_64bit(&elf) && machine == EM_X86_64)
- compatible = 1;
- printk(" Dom0 kernel: %s%s, %s, paddr %#" PRIx64 " -> %#" PRIx64 "\n",
- elf_64bit(&elf) ? "64-bit" : "32-bit",
- parms.pae ? ", PAE" : "",
- elf_msb(&elf) ? "msb" : "lsb",
- elf.pstart, elf.pend);
- if ( elf.bsd_symtab_pstart )
- printk(" Dom0 symbol map %#" PRIx64 " -> %#" PRIx64 "\n",
- elf.bsd_symtab_pstart, elf.bsd_symtab_pend);
-
- if ( !compatible )
- {
- printk("Mismatch between Xen and DOM0 kernel\n");
- rc = -EINVAL;
- goto out;
- }
-
- if ( parms.elf_notes[XEN_ELFNOTE_SUPPORTED_FEATURES].type != XEN_ENT_NONE )
- {
- if ( !test_bit(XENFEAT_dom0, parms.f_supported) )
- {
- printk("Kernel does not support Dom0 operation\n");
- rc = -EINVAL;
- goto out;
- }
- }
-
- if ( compat32 )
- {
- d->arch.is_32bit_pv = d->arch.has_32bit_shinfo = 1;
- v->vcpu_info = (void *)&d->shared_info->compat.vcpu_info[0];
- if ( setup_compat_arg_xlat(v) != 0 )
- BUG();
- }
-
- nr_pages = compute_dom0_nr_pages(d, &parms, initrd_len);
-
- if ( parms.pae == XEN_PAE_EXTCR3 )
- set_bit(VMASST_TYPE_pae_extended_cr3, &d->vm_assist);
-
- if ( (parms.virt_hv_start_low != UNSET_ADDR) && elf_32bit(&elf) )
- {
- unsigned long mask = (1UL << L2_PAGETABLE_SHIFT) - 1;
- value = (parms.virt_hv_start_low + mask) & ~mask;
- BUG_ON(!is_pv_32bit_domain(d));
- if ( value > __HYPERVISOR_COMPAT_VIRT_START )
- panic("Domain 0 expects too high a hypervisor start address");
- HYPERVISOR_COMPAT_VIRT_START(d) =
- max_t(unsigned int, m2p_compat_vstart, value);
- }
-
- if ( (parms.p2m_base != UNSET_ADDR) && elf_32bit(&elf) )
- {
- printk(XENLOG_WARNING "P2M table base ignored\n");
- parms.p2m_base = UNSET_ADDR;
- }
-
- domain_set_alloc_bitsize(d);
-
- /*
- * Why do we need this? The number of page-table frames depends on the
- * size of the bootstrap address space. But the size of the address space
- * depends on the number of page-table frames (since each one is mapped
- * read-only). We have a pair of simultaneous equations in two unknowns,
- * which we solve by exhaustive search.
- */
- v_start = parms.virt_base;
- vkern_start = parms.virt_kstart;
- vkern_end = parms.virt_kend;
- if ( parms.unmapped_initrd )
- {
- vinitrd_start = vinitrd_end = 0;
- vphysmap_start = round_pgup(vkern_end);
- }
- else
- {
- vinitrd_start = round_pgup(vkern_end);
- vinitrd_end = vinitrd_start + initrd_len;
- vphysmap_start = round_pgup(vinitrd_end);
- }
- vphysmap_end = vphysmap_start + (nr_pages * (!is_pv_32bit_domain(d) ?
- sizeof(unsigned long) :
- sizeof(unsigned int)));
- if ( parms.p2m_base != UNSET_ADDR )
- vphysmap_end = vphysmap_start;
- vstartinfo_start = round_pgup(vphysmap_end);
- vstartinfo_end = (vstartinfo_start +
- sizeof(struct start_info) +
- sizeof(struct dom0_vga_console_info));
-
- vpt_start = round_pgup(vstartinfo_end);
- for ( nr_pt_pages = 2; ; nr_pt_pages++ )
- {
- vpt_end = vpt_start + (nr_pt_pages * PAGE_SIZE);
- vstack_start = vpt_end;
- vstack_end = vstack_start + PAGE_SIZE;
- v_end = (vstack_end + (1UL<<22)-1) & ~((1UL<<22)-1);
- if ( (v_end - vstack_end) < (512UL << 10) )
- v_end += 1UL << 22; /* Add extra 4MB to get >= 512kB padding. */
-#define NR(_l,_h,_s) \
- (((((_h) + ((1UL<<(_s))-1)) & ~((1UL<<(_s))-1)) - \
- ((_l) & ~((1UL<<(_s))-1))) >> (_s))
- if ( (!is_pv_32bit_domain(d) + /* # L4 */
- NR(v_start, v_end, L4_PAGETABLE_SHIFT) + /* # L3 */
- (!is_pv_32bit_domain(d) ?
- NR(v_start, v_end, L3_PAGETABLE_SHIFT) : /* # L2 */
- 4) + /* # compat L2 */
- NR(v_start, v_end, L2_PAGETABLE_SHIFT)) /* # L1 */
- <= nr_pt_pages )
- break;
- }
-
- count = v_end - v_start;
- if ( vinitrd_start )
- count -= PAGE_ALIGN(initrd_len);
- order = get_order_from_bytes(count);
- if ( (1UL << order) + PFN_UP(initrd_len) > nr_pages )
- panic("Domain 0 allocation is too small for kernel image");
-
- if ( parms.p2m_base != UNSET_ADDR )
- {
- vphysmap_start = parms.p2m_base;
- vphysmap_end = vphysmap_start + nr_pages * sizeof(unsigned long);
- }
- page = alloc_domheap_pages(d, order, 0);
- if ( page == NULL )
- panic("Not enough RAM for domain 0 allocation");
- alloc_spfn = page_to_mfn(page);
- alloc_epfn = alloc_spfn + d->tot_pages;
-
- if ( initrd_len )
- {
- initrd_pfn = vinitrd_start ?
- (vinitrd_start - v_start) >> PAGE_SHIFT :
- d->tot_pages;
- initrd_mfn = mfn = initrd->mod_start;
- count = PFN_UP(initrd_len);
- if ( d->arch.physaddr_bitsize &&
- ((mfn + count - 1) >> (d->arch.physaddr_bitsize - PAGE_SHIFT)) )
- {
- order = get_order_from_pages(count);
- page = alloc_domheap_pages(d, order, 0);
- if ( !page )
- panic("Not enough RAM for domain 0 initrd");
- for ( count = -count; order--; )
- if ( count & (1UL << order) )
- {
- free_domheap_pages(page, order);
- page += 1UL << order;
- }
- memcpy(page_to_virt(page), mfn_to_virt(initrd->mod_start),
- initrd_len);
- mpt_alloc = (paddr_t)initrd->mod_start << PAGE_SHIFT;
- init_domheap_pages(mpt_alloc,
- mpt_alloc + PAGE_ALIGN(initrd_len));
- initrd->mod_start = initrd_mfn = page_to_mfn(page);
- }
- else
- {
- while ( count-- )
- if ( assign_pages(d, mfn_to_page(mfn++), 0, 0) )
- BUG();
- }
- initrd->mod_end = 0;
- }
-
- printk("PHYSICAL MEMORY ARRANGEMENT:\n"
- " Dom0 alloc.: %"PRIpaddr"->%"PRIpaddr,
- pfn_to_paddr(alloc_spfn), pfn_to_paddr(alloc_epfn));
- if ( d->tot_pages < nr_pages )
- printk(" (%lu pages to be allocated)",
- nr_pages - d->tot_pages);
- if ( initrd )
- {
- mpt_alloc = (paddr_t)initrd->mod_start << PAGE_SHIFT;
- printk("\n Init. ramdisk: %"PRIpaddr"->%"PRIpaddr,
- mpt_alloc, mpt_alloc + initrd_len);
- }
- printk("\nVIRTUAL MEMORY ARRANGEMENT:\n"
- " Loaded kernel: %p->%p\n"
- " Init. ramdisk: %p->%p\n"
- " Phys-Mach map: %p->%p\n"
- " Start info: %p->%p\n"
- " Page tables: %p->%p\n"
- " Boot stack: %p->%p\n"
- " TOTAL: %p->%p\n",
- _p(vkern_start), _p(vkern_end),
- _p(vinitrd_start), _p(vinitrd_end),
- _p(vphysmap_start), _p(vphysmap_end),
- _p(vstartinfo_start), _p(vstartinfo_end),
- _p(vpt_start), _p(vpt_end),
- _p(vstack_start), _p(vstack_end),
- _p(v_start), _p(v_end));
- printk(" ENTRY ADDRESS: %p\n", _p(parms.virt_entry));
-
- process_pending_softirqs();
-
- mpt_alloc = (vpt_start - v_start) + pfn_to_paddr(alloc_spfn);
- if ( vinitrd_start )
- mpt_alloc -= PAGE_ALIGN(initrd_len);
-
- /* Overlap with Xen protected area? */
- if ( !is_pv_32bit_domain(d) ?
- ((v_start < HYPERVISOR_VIRT_END) &&
- (v_end > HYPERVISOR_VIRT_START)) :
- (v_end > HYPERVISOR_COMPAT_VIRT_START(d)) )
- {
- printk("DOM0 image overlaps with Xen private area.\n");
- rc = -EINVAL;
- goto out;
- }
-
- if ( is_pv_32bit_domain(d) )
- {
- v->arch.pv_vcpu.failsafe_callback_cs = FLAT_COMPAT_KERNEL_CS;
- v->arch.pv_vcpu.event_callback_cs = FLAT_COMPAT_KERNEL_CS;
- }
-
- /* WARNING: The new domain must have its 'processor' field filled in! */
- if ( !is_pv_32bit_domain(d) )
- {
- maddr_to_page(mpt_alloc)->u.inuse.type_info = PGT_l4_page_table;
- l4start = l4tab = __va(mpt_alloc); mpt_alloc += PAGE_SIZE;
- }
- else
- {
- page = alloc_domheap_page(d, MEMF_no_owner);
- if ( !page )
- panic("Not enough RAM for domain 0 PML4");
- page->u.inuse.type_info = PGT_l4_page_table|PGT_validated|1;
- l4start = l4tab = page_to_virt(page);
- maddr_to_page(mpt_alloc)->u.inuse.type_info = PGT_l3_page_table;
- l3start = __va(mpt_alloc); mpt_alloc += PAGE_SIZE;
- }
- clear_page(l4tab);
- init_guest_l4_table(l4tab, d, 0);
- v->arch.guest_table = pagetable_from_paddr(__pa(l4start));
- if ( is_pv_32bit_domain(d) )
- v->arch.guest_table_user = v->arch.guest_table;
-
- l4tab += l4_table_offset(v_start);
- pfn = alloc_spfn;
- for ( count = 0; count < ((v_end-v_start)>>PAGE_SHIFT); count++ )
- {
- if ( !((unsigned long)l1tab & (PAGE_SIZE-1)) )
- {
- maddr_to_page(mpt_alloc)->u.inuse.type_info = PGT_l1_page_table;
- l1start = l1tab = __va(mpt_alloc); mpt_alloc += PAGE_SIZE;
- clear_page(l1tab);
- if ( count == 0 )
- l1tab += l1_table_offset(v_start);
- if ( !((unsigned long)l2tab & (PAGE_SIZE-1)) )
- {
- maddr_to_page(mpt_alloc)->u.inuse.type_info = PGT_l2_page_table;
- l2start = l2tab = __va(mpt_alloc); mpt_alloc += PAGE_SIZE;
- clear_page(l2tab);
- if ( count == 0 )
- l2tab += l2_table_offset(v_start);
- if ( !((unsigned long)l3tab & (PAGE_SIZE-1)) )
- {
- if ( count || !l3start )
- {
- maddr_to_page(mpt_alloc)->u.inuse.type_info =
- PGT_l3_page_table;
- l3start = __va(mpt_alloc); mpt_alloc += PAGE_SIZE;
- }
- l3tab = l3start;
- clear_page(l3tab);
- if ( count == 0 )
- l3tab += l3_table_offset(v_start);
- *l4tab = l4e_from_paddr(__pa(l3start), L4_PROT);
- l4tab++;
- }
- *l3tab = l3e_from_paddr(__pa(l2start), L3_PROT);
- l3tab++;
- }
- *l2tab = l2e_from_paddr(__pa(l1start), L2_PROT);
- l2tab++;
- }
- if ( count < initrd_pfn || count >= initrd_pfn + PFN_UP(initrd_len) )
- mfn = pfn++;
- else
- mfn = initrd_mfn++;
- *l1tab = l1e_from_pfn(mfn, (!is_pv_32bit_domain(d) ?
- L1_PROT : COMPAT_L1_PROT));
- l1tab++;
-
- if ( !paging_mode_translate(d) )
- {
- page = mfn_to_page(mfn);
- if ( !page->u.inuse.type_info &&
- !get_page_and_type(page, d, PGT_writable_page) )
- BUG();
- }
- }
-
- if ( is_pv_32bit_domain(d) )
- {
- /* Ensure the first four L3 entries are all populated. */
- for ( i = 0, l3tab = l3start; i < 4; ++i, ++l3tab )
- {
- if ( !l3e_get_intpte(*l3tab) )
- {
- maddr_to_page(mpt_alloc)->u.inuse.type_info = PGT_l2_page_table;
- l2tab = __va(mpt_alloc); mpt_alloc += PAGE_SIZE;
- clear_page(l2tab);
- *l3tab = l3e_from_paddr(__pa(l2tab), L3_PROT);
- }
- if ( i == 3 )
- l3e_get_page(*l3tab)->u.inuse.type_info |= PGT_pae_xen_l2;
- }
- /* Install read-only guest visible MPT mapping. */
- l2tab = l3e_to_l2e(l3start[3]);
- memcpy(&l2tab[COMPAT_L2_PAGETABLE_FIRST_XEN_SLOT(d)],
- &compat_idle_pg_table_l2[l2_table_offset(HIRO_COMPAT_MPT_VIRT_START)],
- COMPAT_L2_PAGETABLE_XEN_SLOTS(d) * sizeof(*l2tab));
- }
-
- /* Pages that are part of page tables must be read only. */
- if ( is_pv_domain(d) )
- mark_pv_pt_pages_rdonly(d, l4start, vpt_start, nr_pt_pages);
-
- /* Mask all upcalls... */
- for ( i = 0; i < XEN_LEGACY_MAX_VCPUS; i++ )
- shared_info(d, vcpu_info[i].evtchn_upcall_mask) = 1;
-
- printk("Dom0 has maximum %u VCPUs\n", d->max_vcpus);
-
- cpu = v->processor;
- for ( i = 1; i < d->max_vcpus; i++ )
- {
- cpu = cpumask_cycle(cpu, &dom0_cpus);
- setup_dom0_vcpu(d, i, cpu);
- }
-
- d->arch.paging.mode = 0;
-
- /* Set up CR3 value for write_ptbase */
- if ( paging_mode_enabled(d) )
- paging_update_paging_modes(v);
- else
- update_cr3(v);
-
- /* We run on dom0's page tables for the final part of the build process. */
- write_ptbase(v);
- mapcache_override_current(v);
-
- /* Copy the OS image and free temporary buffer. */
- elf.dest_base = (void*)vkern_start;
- elf.dest_size = vkern_end - vkern_start;
- elf_set_vcpu(&elf, v);
- rc = elf_load_binary(&elf);
- if ( rc < 0 )
- {
- printk("Failed to load the kernel binary\n");
- goto out;
- }
- bootstrap_map(NULL);
-
- if ( UNSET_ADDR != parms.virt_hypercall )
- {
- if ( (parms.virt_hypercall < v_start) ||
- (parms.virt_hypercall >= v_end) )
- {
- mapcache_override_current(NULL);
- write_ptbase(current);
- printk("Invalid HYPERCALL_PAGE field in ELF notes.\n");
- rc = -1;
- goto out;
- }
- hypercall_page_initialise(
- d, (void *)(unsigned long)parms.virt_hypercall);
- }
-
- /* Free temporary buffers. */
- discard_initial_images();
-
- /* Set up start info area. */
- si = (start_info_t *)vstartinfo_start;
- clear_page(si);
- si->nr_pages = nr_pages;
-
- si->shared_info = virt_to_maddr(d->shared_info);
-
- si->flags = SIF_PRIVILEGED | SIF_INITDOMAIN;
- if ( !vinitrd_start && initrd_len )
- si->flags |= SIF_MOD_START_PFN;
- si->flags |= (xen_processor_pmbits << 8) & SIF_PM_MASK;
- si->pt_base = vpt_start;
- si->nr_pt_frames = nr_pt_pages;
- si->mfn_list = vphysmap_start;
- snprintf(si->magic, sizeof(si->magic), "xen-3.0-x86_%d%s",
- elf_64bit(&elf) ? 64 : 32, parms.pae ? "p" : "");
-
- count = d->tot_pages;
-
- /* Set up the phys->machine table if not part of the initial mapping. */
- if ( is_pv_domain(d) && parms.p2m_base != UNSET_ADDR )
- {
- pfn = pagetable_get_pfn(v->arch.guest_table);
- setup_pv_physmap(d, pfn, v_start, v_end, vphysmap_start, vphysmap_end,
- nr_pages);
- }
-
- /* Write the phys->machine and machine->phys table entries. */
- for ( pfn = 0; pfn < count; pfn++ )
- {
- mfn = pfn + alloc_spfn;
- if ( pfn >= initrd_pfn )
- {
- if ( pfn < initrd_pfn + PFN_UP(initrd_len) )
- mfn = initrd->mod_start + (pfn - initrd_pfn);
- else
- mfn -= PFN_UP(initrd_len);
- }
-#ifndef NDEBUG
-#define REVERSE_START ((v_end - v_start) >> PAGE_SHIFT)
- if ( pfn > REVERSE_START && (vinitrd_start || pfn < initrd_pfn) )
- mfn = alloc_epfn - (pfn - REVERSE_START);
-#endif
- dom0_update_physmap(d, pfn, mfn, vphysmap_start);
- if (!(pfn & 0xfffff))
- process_pending_softirqs();
- }
- si->first_p2m_pfn = pfn;
- si->nr_p2m_frames = d->tot_pages - count;
- page_list_for_each ( page, &d->page_list )
- {
- mfn = page_to_mfn(page);
- BUG_ON(SHARED_M2P(get_gpfn_from_mfn(mfn)));
- if ( get_gpfn_from_mfn(mfn) >= count )
- {
- BUG_ON(is_pv_32bit_domain(d));
- if ( !paging_mode_translate(d) && !page->u.inuse.type_info &&
- !get_page_and_type(page, d, PGT_writable_page) )
- BUG();
-
- dom0_update_physmap(d, pfn, mfn, vphysmap_start);
- ++pfn;
- if (!(pfn & 0xfffff))
- process_pending_softirqs();
- }
- }
- BUG_ON(pfn != d->tot_pages);
-#ifndef NDEBUG
- alloc_epfn += PFN_UP(initrd_len) + si->nr_p2m_frames;
-#endif
- while ( pfn < nr_pages )
- {
- if ( (page = alloc_chunk(d, nr_pages - d->tot_pages)) == NULL )
- panic("Not enough RAM for DOM0 reservation");
- while ( pfn < d->tot_pages )
- {
- mfn = page_to_mfn(page);
-#ifndef NDEBUG
-#define pfn (nr_pages - 1 - (pfn - (alloc_epfn - alloc_spfn)))
-#endif
- dom0_update_physmap(d, pfn, mfn, vphysmap_start);
-#undef pfn
- page++; pfn++;
- if (!(pfn & 0xfffff))
- process_pending_softirqs();
- }
- }
-
- if ( initrd_len != 0 )
- {
- si->mod_start = vinitrd_start ?: initrd_pfn;
- si->mod_len = initrd_len;
- }
-
- memset(si->cmd_line, 0, sizeof(si->cmd_line));
- if ( cmdline != NULL )
- strlcpy((char *)si->cmd_line, cmdline, sizeof(si->cmd_line));
-
- if ( fill_console_start_info((void *)(si + 1)) )
- {
- si->console.dom0.info_off = sizeof(struct start_info);
- si->console.dom0.info_size = sizeof(struct dom0_vga_console_info);
- }
-
- if ( is_pv_32bit_domain(d) )
- xlat_start_info(si, XLAT_start_info_console_dom0);
-
- /* Return to idle domain's page tables. */
- mapcache_override_current(NULL);
- write_ptbase(current);
-
- update_domain_wallclock_time(d);
-
- v->is_initialised = 1;
- clear_bit(_VPF_down, &v->pause_flags);
-
- /*
- * Initial register values:
- * DS,ES,FS,GS = FLAT_KERNEL_DS
- * CS:rIP = FLAT_KERNEL_CS:start_pc
- * SS:rSP = FLAT_KERNEL_SS:start_stack
- * rSI = start_info
- * [rAX,rBX,rCX,rDX,rDI,rBP,R8-R15 are zero]
- */
- regs = &v->arch.user_regs;
- regs->ds = regs->es = regs->fs = regs->gs =
- !is_pv_32bit_domain(d) ? FLAT_KERNEL_DS : FLAT_COMPAT_KERNEL_DS;
- regs->ss = (!is_pv_32bit_domain(d) ?
- FLAT_KERNEL_SS : FLAT_COMPAT_KERNEL_SS);
- regs->cs = (!is_pv_32bit_domain(d) ?
- FLAT_KERNEL_CS : FLAT_COMPAT_KERNEL_CS);
- regs->rip = parms.virt_entry;
- regs->rsp = vstack_end;
- regs->rsi = vstartinfo_start;
- regs->eflags = X86_EFLAGS_IF;
-
-#ifdef CONFIG_SHADOW_PAGING
- if ( opt_dom0_shadow && paging_enable(d, PG_SH_enable) == 0 )
- paging_update_paging_modes(v);
-#endif
-
- /*
- * PVH Fixme: XENFEAT_supervisor_mode_kernel has been reused in PVH with a
- * different meaning.
- */
- if ( test_bit(XENFEAT_supervisor_mode_kernel, parms.f_required) )
- panic("Dom0 requires supervisor-mode execution");
-
- rc = setup_permissions(d);
- BUG_ON(rc != 0);
-
- if ( elf_check_broken(&elf) )
- printk(" Xen warning: dom0 kernel broken ELF: %s\n",
- elf_check_broken(&elf));
-
- if ( d->domain_id == hardware_domid )
- iommu_hwdom_init(d);
-
- return 0;
-
-out:
- if ( elf_check_broken(&elf) )
- printk(" Xen dom0 kernel broken ELF: %s\n",
- elf_check_broken(&elf));
-
- return rc;
-}
static int __init modify_identity_mmio(struct domain *d, unsigned long pfn,
unsigned long nr_pages, const bool map)
@@ -1411,13 +534,13 @@ static int __init pvh_populate_memory_range(struct domain *d,
unsigned int range_order = get_order_from_pages(nr_pages + 1);
order = min(range_order ? range_order - 1 : 0, order);
- page = alloc_domheap_pages(d, order, memflags);
+ page = alloc_domheap_pages(d, order, dom0_memflags);
if ( page == NULL )
{
- if ( order == 0 && memflags )
+ if ( order == 0 && dom0_memflags )
{
- /* Try again without any memflags. */
- memflags = 0;
+ /* Try again without any dom0_memflags. */
+ dom0_memflags = 0;
order = MAX_ORDER;
continue;
}
@@ -1691,7 +814,7 @@ static int __init pvh_setup_p2m(struct domain *d)
bool preempted;
#define MB1_PAGES PFN_DOWN(MB(1))
- nr_pages = compute_dom0_nr_pages(d, NULL, 0);
+ nr_pages = dom0_compute_nr_pages(d, NULL, 0);
pvh_setup_e820(d, nr_pages);
do {
@@ -1903,7 +1026,7 @@ static int __init pvh_setup_cpus(struct domain *d, paddr_t entry,
for ( i = 1; i < d->max_vcpus; i++ )
{
cpu = cpumask_cycle(cpu, &dom0_cpus);
- setup_dom0_vcpu(d, i, cpu);
+ dom0_setup_vcpu(d, i, cpu);
}
rc = arch_set_info_hvm_guest(v, &cpu_ctx);
@@ -1913,7 +1036,7 @@ static int __init pvh_setup_cpus(struct domain *d, paddr_t entry,
return rc;
}
- rc = setup_permissions(d);
+ rc = dom0_setup_permissions(d);
if ( rc )
{
panic("Unable to setup Dom0 permissions: %d\n", rc);
@@ -2423,7 +1546,7 @@ int __init construct_dom0(struct domain *d, const module_t *image,
process_pending_softirqs();
- return (is_hvm_domain(d) ? construct_dom0_pvh : construct_dom0_pv)
+ return (is_hvm_domain(d) ? construct_dom0_pvh : dom0_construct_pv)
(d, image, image_headroom, initrd,bootstrap_map, cmdline);
}
diff --git a/xen/arch/x86/pv/Makefile b/xen/arch/x86/pv/Makefile
index de21937129..ea94599438 100644
--- a/xen/arch/x86/pv/Makefile
+++ b/xen/arch/x86/pv/Makefile
@@ -1 +1,2 @@
obj-y += hypercall.o
+obj-bin-y += dom0_build.init.o
diff --git a/xen/arch/x86/pv/dom0_build.c b/xen/arch/x86/pv/dom0_build.c
new file mode 100644
index 0000000000..bb82c33a4c
--- /dev/null
+++ b/xen/arch/x86/pv/dom0_build.c
@@ -0,0 +1,910 @@
+/******************************************************************************
+ * pv/dom0_build.c
+ *
+ * Copyright (c) 2002-2005, K A Fraser
+ */
+
+#include <xen/console.h>
+#include <xen/domain.h>
+#include <xen/domain_page.h>
+#include <xen/init.h>
+#include <xen/libelf.h>
+#include <xen/multiboot.h>
+#include <xen/paging.h>
+#include <xen/pfn.h>
+#include <xen/sched.h>
+#include <xen/softirq.h>
+
+#include <asm/bzimage.h>
+#include <asm/dom0_build.h>
+#include <asm/page.h>
+#include <asm/setup.h>
+
+/* Allow ring-3 access in long mode as guest cannot use ring 1 ... */
+#define BASE_PROT (_PAGE_PRESENT|_PAGE_RW|_PAGE_ACCESSED|_PAGE_USER)
+#define L1_PROT (BASE_PROT|_PAGE_GUEST_KERNEL)
+/* ... except for compatibility mode guests. */
+#define COMPAT_L1_PROT (_PAGE_PRESENT|_PAGE_RW|_PAGE_ACCESSED)
+#define L2_PROT (BASE_PROT|_PAGE_DIRTY)
+#define L3_PROT (BASE_PROT|_PAGE_DIRTY)
+#define L4_PROT (BASE_PROT|_PAGE_DIRTY)
+
+static __init void dom0_update_physmap(struct domain *d, unsigned long pfn,
+ unsigned long mfn, unsigned long vphysmap_s)
+{
+ if ( !is_pv_32bit_domain(d) )
+ ((unsigned long *)vphysmap_s)[pfn] = mfn;
+ else
+ ((unsigned int *)vphysmap_s)[pfn] = mfn;
+
+ set_gpfn_from_mfn(mfn, pfn);
+}
+
+static __init void mark_pv_pt_pages_rdonly(struct domain *d,
+ l4_pgentry_t *l4start,
+ unsigned long vpt_start,
+ unsigned long nr_pt_pages)
+{
+ unsigned long count;
+ struct page_info *page;
+ l4_pgentry_t *pl4e;
+ l3_pgentry_t *pl3e;
+ l2_pgentry_t *pl2e;
+ l1_pgentry_t *pl1e;
+
+ pl4e = l4start + l4_table_offset(vpt_start);
+ pl3e = l4e_to_l3e(*pl4e);
+ pl3e += l3_table_offset(vpt_start);
+ pl2e = l3e_to_l2e(*pl3e);
+ pl2e += l2_table_offset(vpt_start);
+ pl1e = l2e_to_l1e(*pl2e);
+ pl1e += l1_table_offset(vpt_start);
+ for ( count = 0; count < nr_pt_pages; count++ )
+ {
+ l1e_remove_flags(*pl1e, _PAGE_RW);
+ page = mfn_to_page(l1e_get_pfn(*pl1e));
+
+ /* Read-only mapping + PGC_allocated + page-table page. */
+ page->count_info = PGC_allocated | 3;
+ page->u.inuse.type_info |= PGT_validated | 1;
+
+ /* Top-level p.t. is pinned. */
+ if ( (page->u.inuse.type_info & PGT_type_mask) ==
+ (!is_pv_32bit_domain(d) ?
+ PGT_l4_page_table : PGT_l3_page_table) )
+ {
+ page->count_info += 1;
+ page->u.inuse.type_info += 1 | PGT_pinned;
+ }
+
+ /* Iterate. */
+ if ( !((unsigned long)++pl1e & (PAGE_SIZE - 1)) )
+ {
+ if ( !((unsigned long)++pl2e & (PAGE_SIZE - 1)) )
+ {
+ if ( !((unsigned long)++pl3e & (PAGE_SIZE - 1)) )
+ pl3e = l4e_to_l3e(*++pl4e);
+ pl2e = l3e_to_l2e(*pl3e);
+ }
+ pl1e = l2e_to_l1e(*pl2e);
+ }
+ }
+}
+
+static __init void setup_pv_physmap(struct domain *d, unsigned long pgtbl_pfn,
+ unsigned long v_start, unsigned long v_end,
+ unsigned long vphysmap_start,
+ unsigned long vphysmap_end,
+ unsigned long nr_pages)
+{
+ struct page_info *page = NULL;
+ l4_pgentry_t *pl4e, *l4start = map_domain_page(_mfn(pgtbl_pfn));
+ l3_pgentry_t *pl3e = NULL;
+ l2_pgentry_t *pl2e = NULL;
+ l1_pgentry_t *pl1e = NULL;
+
+ if ( v_start <= vphysmap_end && vphysmap_start <= v_end )
+ panic("DOM0 P->M table overlaps initial mapping");
+
+ while ( vphysmap_start < vphysmap_end )
+ {
+ if ( d->tot_pages + ((round_pgup(vphysmap_end) - vphysmap_start)
+ >> PAGE_SHIFT) + 3 > nr_pages )
+ panic("Dom0 allocation too small for initial P->M table");
+
+ if ( pl1e )
+ {
+ unmap_domain_page(pl1e);
+ pl1e = NULL;
+ }
+ if ( pl2e )
+ {
+ unmap_domain_page(pl2e);
+ pl2e = NULL;
+ }
+ if ( pl3e )
+ {
+ unmap_domain_page(pl3e);
+ pl3e = NULL;
+ }
+ pl4e = l4start + l4_table_offset(vphysmap_start);
+ if ( !l4e_get_intpte(*pl4e) )
+ {
+ page = alloc_domheap_page(d, 0);
+ if ( !page )
+ break;
+
+ /* No mapping, PGC_allocated + page-table page. */
+ page->count_info = PGC_allocated | 2;
+ page->u.inuse.type_info = PGT_l3_page_table | PGT_validated | 1;
+ pl3e = __map_domain_page(page);
+ clear_page(pl3e);
+ *pl4e = l4e_from_page(page, L4_PROT);
+ } else
+ pl3e = map_domain_page(_mfn(l4e_get_pfn(*pl4e)));
+
+ pl3e += l3_table_offset(vphysmap_start);
+ if ( !l3e_get_intpte(*pl3e) )
+ {
+ if ( cpu_has_page1gb &&
+ !(vphysmap_start & ((1UL << L3_PAGETABLE_SHIFT) - 1)) &&
+ vphysmap_end >= vphysmap_start + (1UL << L3_PAGETABLE_SHIFT) &&
+ (page = alloc_domheap_pages(d,
+ L3_PAGETABLE_SHIFT - PAGE_SHIFT,
+ 0)) != NULL )
+ {
+ *pl3e = l3e_from_page(page, L1_PROT|_PAGE_DIRTY|_PAGE_PSE);
+ vphysmap_start += 1UL << L3_PAGETABLE_SHIFT;
+ continue;
+ }
+ if ( (page = alloc_domheap_page(d, 0)) == NULL )
+ break;
+
+ /* No mapping, PGC_allocated + page-table page. */
+ page->count_info = PGC_allocated | 2;
+ page->u.inuse.type_info = PGT_l2_page_table | PGT_validated | 1;
+ pl2e = __map_domain_page(page);
+ clear_page(pl2e);
+ *pl3e = l3e_from_page(page, L3_PROT);
+ }
+ else
+ pl2e = map_domain_page(_mfn(l3e_get_pfn(*pl3e)));
+
+ pl2e += l2_table_offset(vphysmap_start);
+ if ( !l2e_get_intpte(*pl2e) )
+ {
+ if ( !(vphysmap_start & ((1UL << L2_PAGETABLE_SHIFT) - 1)) &&
+ vphysmap_end >= vphysmap_start + (1UL << L2_PAGETABLE_SHIFT) &&
+ (page = alloc_domheap_pages(d,
+ L2_PAGETABLE_SHIFT - PAGE_SHIFT,
+ 0)) != NULL )
+ {
+ *pl2e = l2e_from_page(page, L1_PROT|_PAGE_DIRTY|_PAGE_PSE);
+ if ( opt_allow_superpage )
+ get_superpage(page_to_mfn(page), d);
+ vphysmap_start += 1UL << L2_PAGETABLE_SHIFT;
+ continue;
+ }
+ if ( (page = alloc_domheap_page(d, 0)) == NULL )
+ break;
+
+ /* No mapping, PGC_allocated + page-table page. */
+ page->count_info = PGC_allocated | 2;
+ page->u.inuse.type_info = PGT_l1_page_table | PGT_validated | 1;
+ pl1e = __map_domain_page(page);
+ clear_page(pl1e);
+ *pl2e = l2e_from_page(page, L2_PROT);
+ }
+ else
+ pl1e = map_domain_page(_mfn(l2e_get_pfn(*pl2e)));
+
+ pl1e += l1_table_offset(vphysmap_start);
+ BUG_ON(l1e_get_intpte(*pl1e));
+ page = alloc_domheap_page(d, 0);
+ if ( !page )
+ break;
+
+ *pl1e = l1e_from_page(page, L1_PROT|_PAGE_DIRTY);
+ vphysmap_start += PAGE_SIZE;
+ vphysmap_start &= PAGE_MASK;
+ }
+ if ( !page )
+ panic("Not enough RAM for DOM0 P->M table");
+
+ if ( pl1e )
+ unmap_domain_page(pl1e);
+ if ( pl2e )
+ unmap_domain_page(pl2e);
+ if ( pl3e )
+ unmap_domain_page(pl3e);
+
+ unmap_domain_page(l4start);
+}
+
+static struct page_info * __init alloc_chunk(
+ struct domain *d, unsigned long max_pages)
+{
+ static unsigned int __initdata last_order = MAX_ORDER;
+ struct page_info *page;
+ unsigned int order = get_order_from_pages(max_pages), free_order;
+
+ if ( order > last_order )
+ order = last_order;
+ else if ( max_pages & (max_pages - 1) )
+ --order;
+ while ( (page = alloc_domheap_pages(d, order, dom0_memflags)) == NULL )
+ if ( order-- == 0 )
+ break;
+ if ( page )
+ last_order = order;
+ else if ( dom0_memflags )
+ {
+ /*
+ * Allocate up to 2MB at a time: It prevents allocating very large
+ * chunks from DMA pools before the >4GB pool is fully depleted.
+ */
+ last_order = 21 - PAGE_SHIFT;
+ dom0_memflags = 0;
+ return alloc_chunk(d, max_pages);
+ }
+
+ /*
+ * Make a reasonable attempt at finding a smaller chunk at a higher
+ * address, to avoid allocating from low memory as much as possible.
+ */
+ for ( free_order = order; !dom0_memflags && page && order--; )
+ {
+ struct page_info *pg2;
+
+ if ( d->tot_pages + (1 << order) > d->max_pages )
+ continue;
+ pg2 = alloc_domheap_pages(d, order, MEMF_exact_node);
+ if ( pg2 > page )
+ {
+ free_domheap_pages(page, free_order);
+ page = pg2;
+ free_order = order;
+ }
+ else if ( pg2 )
+ free_domheap_pages(pg2, order);
+ }
+ return page;
+}
+
+int __init dom0_construct_pv(
+ struct domain *d,
+ const module_t *image, unsigned long image_headroom,
+ module_t *initrd,
+ void *(*bootstrap_map)(const module_t *),
+ char *cmdline)
+{
+ int i, cpu, rc, compatible, compat32, order, machine;
+ struct cpu_user_regs *regs;
+ unsigned long pfn, mfn;
+ unsigned long nr_pages;
+ unsigned long nr_pt_pages;
+ unsigned long alloc_spfn;
+ unsigned long alloc_epfn;
+ unsigned long initrd_pfn = -1, initrd_mfn = 0;
+ unsigned long count;
+ struct page_info *page = NULL;
+ start_info_t *si;
+ struct vcpu *v = d->vcpu[0];
+ unsigned long long value;
+ void *image_base = bootstrap_map(image);
+ unsigned long image_len = image->mod_end;
+ void *image_start = image_base + image_headroom;
+ unsigned long initrd_len = initrd ? initrd->mod_end : 0;
+ l4_pgentry_t *l4tab = NULL, *l4start = NULL;
+ l3_pgentry_t *l3tab = NULL, *l3start = NULL;
+ l2_pgentry_t *l2tab = NULL, *l2start = NULL;
+ l1_pgentry_t *l1tab = NULL, *l1start = NULL;
+
+ /*
+ * This fully describes the memory layout of the initial domain. All
+ * *_start address are page-aligned, except v_start (and v_end) which are
+ * superpage-aligned.
+ */
+ struct elf_binary elf;
+ struct elf_dom_parms parms;
+ unsigned long vkern_start;
+ unsigned long vkern_end;
+ unsigned long vinitrd_start;
+ unsigned long vinitrd_end;
+ unsigned long vphysmap_start;
+ unsigned long vphysmap_end;
+ unsigned long vstartinfo_start;
+ unsigned long vstartinfo_end;
+ unsigned long vstack_start;
+ unsigned long vstack_end;
+ unsigned long vpt_start;
+ unsigned long vpt_end;
+ unsigned long v_start;
+ unsigned long v_end;
+
+ /* Machine address of next candidate page-table page. */
+ paddr_t mpt_alloc;
+
+ printk("*** LOADING DOMAIN 0 ***\n");
+
+ d->max_pages = ~0U;
+
+ if ( (rc = bzimage_parse(image_base, &image_start, &image_len)) != 0 )
+ return rc;
+
+ if ( (rc = elf_init(&elf, image_start, image_len)) != 0 )
+ return rc;
+#ifdef CONFIG_VERBOSE_DEBUG
+ elf_set_verbose(&elf);
+#endif
+ elf_parse_binary(&elf);
+ if ( (rc = elf_xen_parse(&elf, &parms)) != 0 )
+ goto out;
+
+ /* compatibility check */
+ compatible = 0;
+ compat32 = 0;
+ machine = elf_uval(&elf, elf.ehdr, e_machine);
+ printk(" Xen kernel: 64-bit, lsb, compat32\n");
+ if (elf_32bit(&elf) && parms.pae == XEN_PAE_BIMODAL)
+ parms.pae = XEN_PAE_EXTCR3;
+ if (elf_32bit(&elf) && parms.pae && machine == EM_386)
+ {
+ compat32 = 1;
+ compatible = 1;
+ }
+ if (elf_64bit(&elf) && machine == EM_X86_64)
+ compatible = 1;
+ printk(" Dom0 kernel: %s%s, %s, paddr %#" PRIx64 " -> %#" PRIx64 "\n",
+ elf_64bit(&elf) ? "64-bit" : "32-bit",
+ parms.pae ? ", PAE" : "",
+ elf_msb(&elf) ? "msb" : "lsb",
+ elf.pstart, elf.pend);
+ if ( elf.bsd_symtab_pstart )
+ printk(" Dom0 symbol map %#" PRIx64 " -> %#" PRIx64 "\n",
+ elf.bsd_symtab_pstart, elf.bsd_symtab_pend);
+
+ if ( !compatible )
+ {
+ printk("Mismatch between Xen and DOM0 kernel\n");
+ rc = -EINVAL;
+ goto out;
+ }
+
+ if ( parms.elf_notes[XEN_ELFNOTE_SUPPORTED_FEATURES].type != XEN_ENT_NONE )
+ {
+ if ( !test_bit(XENFEAT_dom0, parms.f_supported) )
+ {
+ printk("Kernel does not support Dom0 operation\n");
+ rc = -EINVAL;
+ goto out;
+ }
+ }
+
+ if ( compat32 )
+ {
+ d->arch.is_32bit_pv = d->arch.has_32bit_shinfo = 1;
+ v->vcpu_info = (void *)&d->shared_info->compat.vcpu_info[0];
+ if ( setup_compat_arg_xlat(v) != 0 )
+ BUG();
+ }
+
+ nr_pages = dom0_compute_nr_pages(d, &parms, initrd_len);
+
+ if ( parms.pae == XEN_PAE_EXTCR3 )
+ set_bit(VMASST_TYPE_pae_extended_cr3, &d->vm_assist);
+
+ if ( (parms.virt_hv_start_low != UNSET_ADDR) && elf_32bit(&elf) )
+ {
+ unsigned long mask = (1UL << L2_PAGETABLE_SHIFT) - 1;
+ value = (parms.virt_hv_start_low + mask) & ~mask;
+ BUG_ON(!is_pv_32bit_domain(d));
+ if ( value > __HYPERVISOR_COMPAT_VIRT_START )
+ panic("Domain 0 expects too high a hypervisor start address");
+ HYPERVISOR_COMPAT_VIRT_START(d) =
+ max_t(unsigned int, m2p_compat_vstart, value);
+ }
+
+ if ( (parms.p2m_base != UNSET_ADDR) && elf_32bit(&elf) )
+ {
+ printk(XENLOG_WARNING "P2M table base ignored\n");
+ parms.p2m_base = UNSET_ADDR;
+ }
+
+ domain_set_alloc_bitsize(d);
+
+ /*
+ * Why do we need this? The number of page-table frames depends on the
+ * size of the bootstrap address space. But the size of the address space
+ * depends on the number of page-table frames (since each one is mapped
+ * read-only). We have a pair of simultaneous equations in two unknowns,
+ * which we solve by exhaustive search.
+ */
+ v_start = parms.virt_base;
+ vkern_start = parms.virt_kstart;
+ vkern_end = parms.virt_kend;
+ if ( parms.unmapped_initrd )
+ {
+ vinitrd_start = vinitrd_end = 0;
+ vphysmap_start = round_pgup(vkern_end);
+ }
+ else
+ {
+ vinitrd_start = round_pgup(vkern_end);
+ vinitrd_end = vinitrd_start + initrd_len;
+ vphysmap_start = round_pgup(vinitrd_end);
+ }
+ vphysmap_end = vphysmap_start + (nr_pages * (!is_pv_32bit_domain(d) ?
+ sizeof(unsigned long) :
+ sizeof(unsigned int)));
+ if ( parms.p2m_base != UNSET_ADDR )
+ vphysmap_end = vphysmap_start;
+ vstartinfo_start = round_pgup(vphysmap_end);
+ vstartinfo_end = (vstartinfo_start +
+ sizeof(struct start_info) +
+ sizeof(struct dom0_vga_console_info));
+
+ vpt_start = round_pgup(vstartinfo_end);
+ for ( nr_pt_pages = 2; ; nr_pt_pages++ )
+ {
+ vpt_end = vpt_start + (nr_pt_pages * PAGE_SIZE);
+ vstack_start = vpt_end;
+ vstack_end = vstack_start + PAGE_SIZE;
+ v_end = (vstack_end + (1UL<<22)-1) & ~((1UL<<22)-1);
+ if ( (v_end - vstack_end) < (512UL << 10) )
+ v_end += 1UL << 22; /* Add extra 4MB to get >= 512kB padding. */
+#define NR(_l,_h,_s) \
+ (((((_h) + ((1UL<<(_s))-1)) & ~((1UL<<(_s))-1)) - \
+ ((_l) & ~((1UL<<(_s))-1))) >> (_s))
+ if ( (!is_pv_32bit_domain(d) + /* # L4 */
+ NR(v_start, v_end, L4_PAGETABLE_SHIFT) + /* # L3 */
+ (!is_pv_32bit_domain(d) ?
+ NR(v_start, v_end, L3_PAGETABLE_SHIFT) : /* # L2 */
+ 4) + /* # compat L2 */
+ NR(v_start, v_end, L2_PAGETABLE_SHIFT)) /* # L1 */
+ <= nr_pt_pages )
+ break;
+ }
+
+ count = v_end - v_start;
+ if ( vinitrd_start )
+ count -= PAGE_ALIGN(initrd_len);
+ order = get_order_from_bytes(count);
+ if ( (1UL << order) + PFN_UP(initrd_len) > nr_pages )
+ panic("Domain 0 allocation is too small for kernel image");
+
+ if ( parms.p2m_base != UNSET_ADDR )
+ {
+ vphysmap_start = parms.p2m_base;
+ vphysmap_end = vphysmap_start + nr_pages * sizeof(unsigned long);
+ }
+ page = alloc_domheap_pages(d, order, 0);
+ if ( page == NULL )
+ panic("Not enough RAM for domain 0 allocation");
+ alloc_spfn = page_to_mfn(page);
+ alloc_epfn = alloc_spfn + d->tot_pages;
+
+ if ( initrd_len )
+ {
+ initrd_pfn = vinitrd_start ?
+ (vinitrd_start - v_start) >> PAGE_SHIFT :
+ d->tot_pages;
+ initrd_mfn = mfn = initrd->mod_start;
+ count = PFN_UP(initrd_len);
+ if ( d->arch.physaddr_bitsize &&
+ ((mfn + count - 1) >> (d->arch.physaddr_bitsize - PAGE_SHIFT)) )
+ {
+ order = get_order_from_pages(count);
+ page = alloc_domheap_pages(d, order, 0);
+ if ( !page )
+ panic("Not enough RAM for domain 0 initrd");
+ for ( count = -count; order--; )
+ if ( count & (1UL << order) )
+ {
+ free_domheap_pages(page, order);
+ page += 1UL << order;
+ }
+ memcpy(page_to_virt(page), mfn_to_virt(initrd->mod_start),
+ initrd_len);
+ mpt_alloc = (paddr_t)initrd->mod_start << PAGE_SHIFT;
+ init_domheap_pages(mpt_alloc,
+ mpt_alloc + PAGE_ALIGN(initrd_len));
+ initrd->mod_start = initrd_mfn = page_to_mfn(page);
+ }
+ else
+ {
+ while ( count-- )
+ if ( assign_pages(d, mfn_to_page(mfn++), 0, 0) )
+ BUG();
+ }
+ initrd->mod_end = 0;
+ }
+
+ printk("PHYSICAL MEMORY ARRANGEMENT:\n"
+ " Dom0 alloc.: %"PRIpaddr"->%"PRIpaddr,
+ pfn_to_paddr(alloc_spfn), pfn_to_paddr(alloc_epfn));
+ if ( d->tot_pages < nr_pages )
+ printk(" (%lu pages to be allocated)",
+ nr_pages - d->tot_pages);
+ if ( initrd )
+ {
+ mpt_alloc = (paddr_t)initrd->mod_start << PAGE_SHIFT;
+ printk("\n Init. ramdisk: %"PRIpaddr"->%"PRIpaddr,
+ mpt_alloc, mpt_alloc + initrd_len);
+ }
+ printk("\nVIRTUAL MEMORY ARRANGEMENT:\n"
+ " Loaded kernel: %p->%p\n"
+ " Init. ramdisk: %p->%p\n"
+ " Phys-Mach map: %p->%p\n"
+ " Start info: %p->%p\n"
+ " Page tables: %p->%p\n"
+ " Boot stack: %p->%p\n"
+ " TOTAL: %p->%p\n",
+ _p(vkern_start), _p(vkern_end),
+ _p(vinitrd_start), _p(vinitrd_end),
+ _p(vphysmap_start), _p(vphysmap_end),
+ _p(vstartinfo_start), _p(vstartinfo_end),
+ _p(vpt_start), _p(vpt_end),
+ _p(vstack_start), _p(vstack_end),
+ _p(v_start), _p(v_end));
+ printk(" ENTRY ADDRESS: %p\n", _p(parms.virt_entry));
+
+ process_pending_softirqs();
+
+ mpt_alloc = (vpt_start - v_start) + pfn_to_paddr(alloc_spfn);
+ if ( vinitrd_start )
+ mpt_alloc -= PAGE_ALIGN(initrd_len);
+
+ /* Overlap with Xen protected area? */
+ if ( !is_pv_32bit_domain(d) ?
+ ((v_start < HYPERVISOR_VIRT_END) &&
+ (v_end > HYPERVISOR_VIRT_START)) :
+ (v_end > HYPERVISOR_COMPAT_VIRT_START(d)) )
+ {
+ printk("DOM0 image overlaps with Xen private area.\n");
+ rc = -EINVAL;
+ goto out;
+ }
+
+ if ( is_pv_32bit_domain(d) )
+ {
+ v->arch.pv_vcpu.failsafe_callback_cs = FLAT_COMPAT_KERNEL_CS;
+ v->arch.pv_vcpu.event_callback_cs = FLAT_COMPAT_KERNEL_CS;
+ }
+
+ /* WARNING: The new domain must have its 'processor' field filled in! */
+ if ( !is_pv_32bit_domain(d) )
+ {
+ maddr_to_page(mpt_alloc)->u.inuse.type_info = PGT_l4_page_table;
+ l4start = l4tab = __va(mpt_alloc); mpt_alloc += PAGE_SIZE;
+ }
+ else
+ {
+ page = alloc_domheap_page(d, MEMF_no_owner);
+ if ( !page )
+ panic("Not enough RAM for domain 0 PML4");
+ page->u.inuse.type_info = PGT_l4_page_table|PGT_validated|1;
+ l4start = l4tab = page_to_virt(page);
+ maddr_to_page(mpt_alloc)->u.inuse.type_info = PGT_l3_page_table;
+ l3start = __va(mpt_alloc); mpt_alloc += PAGE_SIZE;
+ }
+ clear_page(l4tab);
+ init_guest_l4_table(l4tab, d, 0);
+ v->arch.guest_table = pagetable_from_paddr(__pa(l4start));
+ if ( is_pv_32bit_domain(d) )
+ v->arch.guest_table_user = v->arch.guest_table;
+
+ l4tab += l4_table_offset(v_start);
+ pfn = alloc_spfn;
+ for ( count = 0; count < ((v_end-v_start)>>PAGE_SHIFT); count++ )
+ {
+ if ( !((unsigned long)l1tab & (PAGE_SIZE-1)) )
+ {
+ maddr_to_page(mpt_alloc)->u.inuse.type_info = PGT_l1_page_table;
+ l1start = l1tab = __va(mpt_alloc); mpt_alloc += PAGE_SIZE;
+ clear_page(l1tab);
+ if ( count == 0 )
+ l1tab += l1_table_offset(v_start);
+ if ( !((unsigned long)l2tab & (PAGE_SIZE-1)) )
+ {
+ maddr_to_page(mpt_alloc)->u.inuse.type_info = PGT_l2_page_table;
+ l2start = l2tab = __va(mpt_alloc); mpt_alloc += PAGE_SIZE;
+ clear_page(l2tab);
+ if ( count == 0 )
+ l2tab += l2_table_offset(v_start);
+ if ( !((unsigned long)l3tab & (PAGE_SIZE-1)) )
+ {
+ if ( count || !l3start )
+ {
+ maddr_to_page(mpt_alloc)->u.inuse.type_info =
+ PGT_l3_page_table;
+ l3start = __va(mpt_alloc); mpt_alloc += PAGE_SIZE;
+ }
+ l3tab = l3start;
+ clear_page(l3tab);
+ if ( count == 0 )
+ l3tab += l3_table_offset(v_start);
+ *l4tab = l4e_from_paddr(__pa(l3start), L4_PROT);
+ l4tab++;
+ }
+ *l3tab = l3e_from_paddr(__pa(l2start), L3_PROT);
+ l3tab++;
+ }
+ *l2tab = l2e_from_paddr(__pa(l1start), L2_PROT);
+ l2tab++;
+ }
+ if ( count < initrd_pfn || count >= initrd_pfn + PFN_UP(initrd_len) )
+ mfn = pfn++;
+ else
+ mfn = initrd_mfn++;
+ *l1tab = l1e_from_pfn(mfn, (!is_pv_32bit_domain(d) ?
+ L1_PROT : COMPAT_L1_PROT));
+ l1tab++;
+
+ if ( !paging_mode_translate(d) )
+ {
+ page = mfn_to_page(mfn);
+ if ( !page->u.inuse.type_info &&
+ !get_page_and_type(page, d, PGT_writable_page) )
+ BUG();
+ }
+ }
+
+ if ( is_pv_32bit_domain(d) )
+ {
+ /* Ensure the first four L3 entries are all populated. */
+ for ( i = 0, l3tab = l3start; i < 4; ++i, ++l3tab )
+ {
+ if ( !l3e_get_intpte(*l3tab) )
+ {
+ maddr_to_page(mpt_alloc)->u.inuse.type_info = PGT_l2_page_table;
+ l2tab = __va(mpt_alloc); mpt_alloc += PAGE_SIZE;
+ clear_page(l2tab);
+ *l3tab = l3e_from_paddr(__pa(l2tab), L3_PROT);
+ }
+ if ( i == 3 )
+ l3e_get_page(*l3tab)->u.inuse.type_info |= PGT_pae_xen_l2;
+ }
+ /* Install read-only guest visible MPT mapping. */
+ l2tab = l3e_to_l2e(l3start[3]);
+ memcpy(&l2tab[COMPAT_L2_PAGETABLE_FIRST_XEN_SLOT(d)],
+ &compat_idle_pg_table_l2[l2_table_offset(HIRO_COMPAT_MPT_VIRT_START)],
+ COMPAT_L2_PAGETABLE_XEN_SLOTS(d) * sizeof(*l2tab));
+ }
+
+ /* Pages that are part of page tables must be read only. */
+ if ( is_pv_domain(d) )
+ mark_pv_pt_pages_rdonly(d, l4start, vpt_start, nr_pt_pages);
+
+ /* Mask all upcalls... */
+ for ( i = 0; i < XEN_LEGACY_MAX_VCPUS; i++ )
+ shared_info(d, vcpu_info[i].evtchn_upcall_mask) = 1;
+
+ printk("Dom0 has maximum %u VCPUs\n", d->max_vcpus);
+
+ cpu = v->processor;
+ for ( i = 1; i < d->max_vcpus; i++ )
+ {
+ cpu = cpumask_cycle(cpu, &dom0_cpus);
+ dom0_setup_vcpu(d, i, cpu);
+ }
+
+ d->arch.paging.mode = 0;
+
+ /* Set up CR3 value for write_ptbase */
+ if ( paging_mode_enabled(d) )
+ paging_update_paging_modes(v);
+ else
+ update_cr3(v);
+
+ /* We run on dom0's page tables for the final part of the build process. */
+ write_ptbase(v);
+ mapcache_override_current(v);
+
+ /* Copy the OS image and free temporary buffer. */
+ elf.dest_base = (void*)vkern_start;
+ elf.dest_size = vkern_end - vkern_start;
+ elf_set_vcpu(&elf, v);
+ rc = elf_load_binary(&elf);
+ if ( rc < 0 )
+ {
+ printk("Failed to load the kernel binary\n");
+ goto out;
+ }
+ bootstrap_map(NULL);
+
+ if ( UNSET_ADDR != parms.virt_hypercall )
+ {
+ if ( (parms.virt_hypercall < v_start) ||
+ (parms.virt_hypercall >= v_end) )
+ {
+ mapcache_override_current(NULL);
+ write_ptbase(current);
+ printk("Invalid HYPERCALL_PAGE field in ELF notes.\n");
+ rc = -1;
+ goto out;
+ }
+ hypercall_page_initialise(
+ d, (void *)(unsigned long)parms.virt_hypercall);
+ }
+
+ /* Free temporary buffers. */
+ discard_initial_images();
+
+ /* Set up start info area. */
+ si = (start_info_t *)vstartinfo_start;
+ clear_page(si);
+ si->nr_pages = nr_pages;
+
+ si->shared_info = virt_to_maddr(d->shared_info);
+
+ si->flags = SIF_PRIVILEGED | SIF_INITDOMAIN;
+ if ( !vinitrd_start && initrd_len )
+ si->flags |= SIF_MOD_START_PFN;
+ si->flags |= (xen_processor_pmbits << 8) & SIF_PM_MASK;
+ si->pt_base = vpt_start;
+ si->nr_pt_frames = nr_pt_pages;
+ si->mfn_list = vphysmap_start;
+ snprintf(si->magic, sizeof(si->magic), "xen-3.0-x86_%d%s",
+ elf_64bit(&elf) ? 64 : 32, parms.pae ? "p" : "");
+
+ count = d->tot_pages;
+
+ /* Set up the phys->machine table if not part of the initial mapping. */
+ if ( is_pv_domain(d) && parms.p2m_base != UNSET_ADDR )
+ {
+ pfn = pagetable_get_pfn(v->arch.guest_table);
+ setup_pv_physmap(d, pfn, v_start, v_end, vphysmap_start, vphysmap_end,
+ nr_pages);
+ }
+
+ /* Write the phys->machine and machine->phys table entries. */
+ for ( pfn = 0; pfn < count; pfn++ )
+ {
+ mfn = pfn + alloc_spfn;
+ if ( pfn >= initrd_pfn )
+ {
+ if ( pfn < initrd_pfn + PFN_UP(initrd_len) )
+ mfn = initrd->mod_start + (pfn - initrd_pfn);
+ else
+ mfn -= PFN_UP(initrd_len);
+ }
+#ifndef NDEBUG
+#define REVERSE_START ((v_end - v_start) >> PAGE_SHIFT)
+ if ( pfn > REVERSE_START && (vinitrd_start || pfn < initrd_pfn) )
+ mfn = alloc_epfn - (pfn - REVERSE_START);
+#endif
+ dom0_update_physmap(d, pfn, mfn, vphysmap_start);
+ if (!(pfn & 0xfffff))
+ process_pending_softirqs();
+ }
+ si->first_p2m_pfn = pfn;
+ si->nr_p2m_frames = d->tot_pages - count;
+ page_list_for_each ( page, &d->page_list )
+ {
+ mfn = page_to_mfn(page);
+ BUG_ON(SHARED_M2P(get_gpfn_from_mfn(mfn)));
+ if ( get_gpfn_from_mfn(mfn) >= count )
+ {
+ BUG_ON(is_pv_32bit_domain(d));
+ if ( !paging_mode_translate(d) && !page->u.inuse.type_info &&
+ !get_page_and_type(page, d, PGT_writable_page) )
+ BUG();
+
+ dom0_update_physmap(d, pfn, mfn, vphysmap_start);
+ ++pfn;
+ if (!(pfn & 0xfffff))
+ process_pending_softirqs();
+ }
+ }
+ BUG_ON(pfn != d->tot_pages);
+#ifndef NDEBUG
+ alloc_epfn += PFN_UP(initrd_len) + si->nr_p2m_frames;
+#endif
+ while ( pfn < nr_pages )
+ {
+ if ( (page = alloc_chunk(d, nr_pages - d->tot_pages)) == NULL )
+ panic("Not enough RAM for DOM0 reservation");
+ while ( pfn < d->tot_pages )
+ {
+ mfn = page_to_mfn(page);
+#ifndef NDEBUG
+#define pfn (nr_pages - 1 - (pfn - (alloc_epfn - alloc_spfn)))
+#endif
+ dom0_update_physmap(d, pfn, mfn, vphysmap_start);
+#undef pfn
+ page++; pfn++;
+ if (!(pfn & 0xfffff))
+ process_pending_softirqs();
+ }
+ }
+
+ if ( initrd_len != 0 )
+ {
+ si->mod_start = vinitrd_start ?: initrd_pfn;
+ si->mod_len = initrd_len;
+ }
+
+ memset(si->cmd_line, 0, sizeof(si->cmd_line));
+ if ( cmdline != NULL )
+ strlcpy((char *)si->cmd_line, cmdline, sizeof(si->cmd_line));
+
+ if ( fill_console_start_info((void *)(si + 1)) )
+ {
+ si->console.dom0.info_off = sizeof(struct start_info);
+ si->console.dom0.info_size = sizeof(struct dom0_vga_console_info);
+ }
+
+ if ( is_pv_32bit_domain(d) )
+ xlat_start_info(si, XLAT_start_info_console_dom0);
+
+ /* Return to idle domain's page tables. */
+ mapcache_override_current(NULL);
+ write_ptbase(current);
+
+ update_domain_wallclock_time(d);
+
+ v->is_initialised = 1;
+ clear_bit(_VPF_down, &v->pause_flags);
+
+ /*
+ * Initial register values:
+ * DS,ES,FS,GS = FLAT_KERNEL_DS
+ * CS:rIP = FLAT_KERNEL_CS:start_pc
+ * SS:rSP = FLAT_KERNEL_SS:start_stack
+ * rSI = start_info
+ * [rAX,rBX,rCX,rDX,rDI,rBP,R8-R15 are zero]
+ */
+ regs = &v->arch.user_regs;
+ regs->ds = regs->es = regs->fs = regs->gs =
+ !is_pv_32bit_domain(d) ? FLAT_KERNEL_DS : FLAT_COMPAT_KERNEL_DS;
+ regs->ss = (!is_pv_32bit_domain(d) ?
+ FLAT_KERNEL_SS : FLAT_COMPAT_KERNEL_SS);
+ regs->cs = (!is_pv_32bit_domain(d) ?
+ FLAT_KERNEL_CS : FLAT_COMPAT_KERNEL_CS);
+ regs->rip = parms.virt_entry;
+ regs->rsp = vstack_end;
+ regs->rsi = vstartinfo_start;
+ regs->eflags = X86_EFLAGS_IF;
+
+#ifdef CONFIG_SHADOW_PAGING
+ if ( opt_dom0_shadow && paging_enable(d, PG_SH_enable) == 0 )
+ paging_update_paging_modes(v);
+#endif
+
+ /*
+ * PVH Fixme: XENFEAT_supervisor_mode_kernel has been reused in PVH with a
+ * different meaning.
+ */
+ if ( test_bit(XENFEAT_supervisor_mode_kernel, parms.f_required) )
+ panic("Dom0 requires supervisor-mode execution");
+
+ rc = dom0_setup_permissions(d);
+ BUG_ON(rc != 0);
+
+ if ( elf_check_broken(&elf) )
+ printk(" Xen warning: dom0 kernel broken ELF: %s\n",
+ elf_check_broken(&elf));
+
+ if ( d->domain_id == hardware_domid )
+ iommu_hwdom_init(d);
+
+ return 0;
+
+out:
+ if ( elf_check_broken(&elf) )
+ printk(" Xen dom0 kernel broken ELF: %s\n",
+ elf_check_broken(&elf));
+
+ return rc;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/include/asm-x86/dom0_build.h b/xen/include/asm-x86/dom0_build.h
new file mode 100644
index 0000000000..2ba349e445
--- /dev/null
+++ b/xen/include/asm-x86/dom0_build.h
@@ -0,0 +1,32 @@
+#ifndef _DOM0_BUILD_H_
+#define _DOM0_BUILD_H_
+
+#include <asm/setup.h>
+
+extern unsigned int dom0_memflags;
+extern cpumask_t dom0_cpus;
+
+unsigned long dom0_compute_nr_pages(
+ struct domain *d, struct elf_dom_parms *parms, unsigned long initrd_len);
+struct vcpu *dom0_setup_vcpu(struct domain *d, unsigned int vcpu_id,
+ unsigned int cpu);
+int dom0_setup_permissions(struct domain *d);
+
+int dom0_construct_pv(
+ struct domain *d,
+ const module_t *image, unsigned long image_headroom,
+ module_t *initrd,
+ void *(*bootstrap_map)(const module_t *),
+ char *cmdline);
+
+#endif /* _DOM0_BUILD_H_ */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
--
2.11.0
_______________________________________________
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Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply related [flat|nested] 18+ messages in thread* [PATCH v2 3/4] x86: split PVH dom0 builder to hvm/dom0_build.c
2017-03-16 17:54 [PATCH v2 0/4] Refactor x86 dom0 builder Wei Liu
2017-03-16 17:54 ` [PATCH v2 1/4] x86: rename domain_build.c to dom0_build.c Wei Liu
2017-03-16 17:54 ` [PATCH v2 2/4] x86: split PV dom0 builder to pv/dom0_builder.c Wei Liu
@ 2017-03-16 17:54 ` Wei Liu
2017-03-16 18:16 ` Roger Pau Monné
2017-03-16 17:54 ` [PATCH v2 4/4] x86: clean up header files in dom0_build.c Wei Liu
3 siblings, 1 reply; 18+ messages in thread
From: Wei Liu @ 2017-03-16 17:54 UTC (permalink / raw)
To: Xen-devel; +Cc: Andrew Cooper, Wei Liu, Jan Beulich, Roger Pau Monné
Long term we want to be able to disentangle PV and HVM code. Move
the PVH domain builder to a dedicated file.
Lift function declarations to dom0_build.h and rename them when
necessary.
No functional change.
Signed-off-by: Wei Liu <wei.liu2@citrix.com>
---
v2:
1. add copyright header
---
xen/arch/x86/dom0_build.c | 1069 +-----------------------------------
xen/arch/x86/hvm/Makefile | 1 +
xen/arch/x86/hvm/dom0_build.c | 1112 ++++++++++++++++++++++++++++++++++++++
xen/include/asm-x86/dom0_build.h | 9 +
4 files changed, 1125 insertions(+), 1066 deletions(-)
create mode 100644 xen/arch/x86/hvm/dom0_build.c
diff --git a/xen/arch/x86/dom0_build.c b/xen/arch/x86/dom0_build.c
index c74f9b52e0..772f077d5a 100644
--- a/xen/arch/x86/dom0_build.c
+++ b/xen/arch/x86/dom0_build.c
@@ -50,27 +50,6 @@ static long __initdata dom0_nrpages;
static long __initdata dom0_min_nrpages;
static long __initdata dom0_max_nrpages = LONG_MAX;
-/*
- * Have the TSS cover the ISA port range, which makes it
- * - 104 bytes base structure
- * - 32 bytes interrupt redirection bitmap
- * - 128 bytes I/O bitmap
- * - one trailing byte
- * or a total of 265 bytes.
- *
- * NB: as PVHv2 Dom0 doesn't have legacy devices (ISA), it shouldn't have any
- * business in accessing the ISA port range, much less in real mode, and due to
- * the lack of firmware it shouldn't also execute any INT instruction. This is
- * done just for consistency with what hvmloader does.
- */
-#define HVM_VM86_TSS_SIZE 265
-
-static unsigned int __initdata acpi_intr_overrides;
-static struct acpi_madt_interrupt_override __initdata *intsrcovr;
-
-static unsigned int __initdata acpi_nmi_sources;
-static struct acpi_madt_nmi_source __initdata *nmisrc;
-
/*
* dom0_mem=[min:<min_amt>,][max:<max_amt>,][<amt>]
*
@@ -261,8 +240,8 @@ boolean_param("ro-hpet", ro_hpet);
unsigned int __initdata dom0_memflags = MEMF_no_dma|MEMF_exact_node;
-static unsigned long __init dom0_paging_pages(const struct domain *d,
- unsigned long nr_pages)
+unsigned long __init dom0_paging_pages(const struct domain *d,
+ unsigned long nr_pages)
{
/* Copied from: libxl_get_required_shadow_memory() */
unsigned long memkb = nr_pages * (PAGE_SIZE / 1024);
@@ -492,1048 +471,6 @@ int __init dom0_setup_permissions(struct domain *d)
}
-static int __init modify_identity_mmio(struct domain *d, unsigned long pfn,
- unsigned long nr_pages, const bool map)
-{
- int rc;
-
- for ( ; ; )
- {
- rc = (map ? map_mmio_regions : unmap_mmio_regions)
- (d, _gfn(pfn), nr_pages, _mfn(pfn));
- if ( rc == 0 )
- break;
- if ( rc < 0 )
- {
- printk(XENLOG_WARNING
- "Failed to identity %smap [%#lx,%#lx) for d%d: %d\n",
- map ? "" : "un", pfn, pfn + nr_pages, d->domain_id, rc);
- break;
- }
- nr_pages -= rc;
- pfn += rc;
- process_pending_softirqs();
- }
-
- return rc;
-}
-
-/* Populate a HVM memory range using the biggest possible order. */
-static int __init pvh_populate_memory_range(struct domain *d,
- unsigned long start,
- unsigned long nr_pages)
-{
- unsigned int order, i = 0;
- struct page_info *page;
- int rc;
-#define MAP_MAX_ITER 64
-
- order = MAX_ORDER;
- while ( nr_pages != 0 )
- {
- unsigned int range_order = get_order_from_pages(nr_pages + 1);
-
- order = min(range_order ? range_order - 1 : 0, order);
- page = alloc_domheap_pages(d, order, dom0_memflags);
- if ( page == NULL )
- {
- if ( order == 0 && dom0_memflags )
- {
- /* Try again without any dom0_memflags. */
- dom0_memflags = 0;
- order = MAX_ORDER;
- continue;
- }
- if ( order == 0 )
- {
- printk("Unable to allocate memory with order 0!\n");
- return -ENOMEM;
- }
- order--;
- continue;
- }
-
- rc = guest_physmap_add_page(d, _gfn(start), _mfn(page_to_mfn(page)),
- order);
- if ( rc != 0 )
- {
- printk("Failed to populate memory: [%#lx,%lx): %d\n",
- start, start + (1UL << order), rc);
- return -ENOMEM;
- }
- start += 1UL << order;
- nr_pages -= 1UL << order;
- if ( (++i % MAP_MAX_ITER) == 0 )
- process_pending_softirqs();
- }
-
- return 0;
-#undef MAP_MAX_ITER
-}
-
-/* Steal RAM from the end of a memory region. */
-static int __init pvh_steal_ram(struct domain *d, unsigned long size,
- unsigned long align, paddr_t limit,
- paddr_t *addr)
-{
- unsigned int i = d->arch.nr_e820;
-
- /*
- * Alignment 0 should be set to 1, so it doesn't wrap around in the
- * calculations below.
- */
- align = align ? : 1;
- while ( i-- )
- {
- struct e820entry *entry = &d->arch.e820[i];
-
- if ( entry->type != E820_RAM || entry->addr + entry->size > limit ||
- entry->addr < MB(1) )
- continue;
-
- *addr = (entry->addr + entry->size - size) & ~(align - 1);
- if ( *addr < entry->addr )
- continue;
-
- entry->size = *addr - entry->addr;
- return 0;
- }
-
- return -ENOMEM;
-}
-
-/* NB: memory map must be sorted at all times for this to work correctly. */
-static int __init pvh_add_mem_range(struct domain *d, uint64_t s, uint64_t e,
- unsigned int type)
-{
- struct e820entry *map;
- unsigned int i;
-
- for ( i = 0; i < d->arch.nr_e820; i++ )
- {
- uint64_t rs = d->arch.e820[i].addr;
- uint64_t re = rs + d->arch.e820[i].size;
-
- if ( rs == e && d->arch.e820[i].type == type )
- {
- d->arch.e820[i].addr = s;
- return 0;
- }
-
- if ( re == s && d->arch.e820[i].type == type &&
- (i + 1 == d->arch.nr_e820 || d->arch.e820[i + 1].addr >= e) )
- {
- d->arch.e820[i].size += e - s;
- return 0;
- }
-
- if ( rs >= e )
- break;
-
- if ( re > s )
- return -EEXIST;
- }
-
- map = xzalloc_array(struct e820entry, d->arch.nr_e820 + 1);
- if ( !map )
- {
- printk(XENLOG_WARNING "E820: out of memory to add region\n");
- return -ENOMEM;
- }
-
- memcpy(map, d->arch.e820, i * sizeof(*d->arch.e820));
- memcpy(map + i + 1, d->arch.e820 + i,
- (d->arch.nr_e820 - i) * sizeof(*d->arch.e820));
- map[i].addr = s;
- map[i].size = e - s;
- map[i].type = type;
- xfree(d->arch.e820);
- d->arch.e820 = map;
- d->arch.nr_e820++;
-
- return 0;
-}
-
-static int __init pvh_setup_vmx_realmode_helpers(struct domain *d)
-{
- p2m_type_t p2mt;
- uint32_t rc, *ident_pt;
- mfn_t mfn;
- paddr_t gaddr;
- struct vcpu *v = d->vcpu[0];
-
- /*
- * Steal some space from the last RAM region below 4GB and use it to
- * store the real-mode TSS. It needs to be aligned to 128 so that the
- * TSS structure (which accounts for the first 104b) doesn't cross
- * a page boundary.
- */
- if ( !pvh_steal_ram(d, HVM_VM86_TSS_SIZE, 128, GB(4), &gaddr) )
- {
- if ( hvm_copy_to_guest_phys(gaddr, NULL, HVM_VM86_TSS_SIZE, v) !=
- HVMCOPY_okay )
- printk("Unable to zero VM86 TSS area\n");
- d->arch.hvm_domain.params[HVM_PARAM_VM86_TSS_SIZED] =
- VM86_TSS_UPDATED | ((uint64_t)HVM_VM86_TSS_SIZE << 32) | gaddr;
- if ( pvh_add_mem_range(d, gaddr, gaddr + HVM_VM86_TSS_SIZE,
- E820_RESERVED) )
- printk("Unable to set VM86 TSS as reserved in the memory map\n");
- }
- else
- printk("Unable to allocate VM86 TSS area\n");
-
- /* Steal some more RAM for the identity page tables. */
- if ( pvh_steal_ram(d, PAGE_SIZE, PAGE_SIZE, GB(4), &gaddr) )
- {
- printk("Unable to find memory to stash the identity page tables\n");
- return -ENOMEM;
- }
-
- /*
- * Identity-map page table is required for running with CR0.PG=0
- * when using Intel EPT. Create a 32-bit non-PAE page directory of
- * superpages.
- */
- ident_pt = map_domain_gfn(p2m_get_hostp2m(d), _gfn(PFN_DOWN(gaddr)),
- &mfn, &p2mt, 0, &rc);
- if ( ident_pt == NULL )
- {
- printk("Unable to map identity page tables\n");
- return -ENOMEM;
- }
- write_32bit_pse_identmap(ident_pt);
- unmap_domain_page(ident_pt);
- put_page(mfn_to_page(mfn_x(mfn)));
- d->arch.hvm_domain.params[HVM_PARAM_IDENT_PT] = gaddr;
- if ( pvh_add_mem_range(d, gaddr, gaddr + PAGE_SIZE, E820_RESERVED) )
- printk("Unable to set identity page tables as reserved in the memory map\n");
-
- return 0;
-}
-
-/* Assign the low 1MB to Dom0. */
-static void __init pvh_steal_low_ram(struct domain *d, unsigned long start,
- unsigned long nr_pages)
-{
- unsigned long mfn;
-
- ASSERT(start + nr_pages <= PFN_DOWN(MB(1)));
-
- for ( mfn = start; mfn < start + nr_pages; mfn++ )
- {
- struct page_info *pg = mfn_to_page(mfn);
- int rc;
-
- rc = unshare_xen_page_with_guest(pg, dom_io);
- if ( rc )
- {
- printk("Unable to unshare Xen mfn %#lx: %d\n", mfn, rc);
- continue;
- }
-
- share_xen_page_with_guest(pg, d, XENSHARE_writable);
- rc = guest_physmap_add_entry(d, _gfn(mfn), _mfn(mfn), 0, p2m_ram_rw);
- if ( rc )
- printk("Unable to add mfn %#lx to p2m: %d\n", mfn, rc);
- }
-}
-
-static __init void pvh_setup_e820(struct domain *d, unsigned long nr_pages)
-{
- struct e820entry *entry, *entry_guest;
- unsigned int i;
- unsigned long pages, cur_pages = 0;
- uint64_t start, end;
-
- /*
- * Craft the e820 memory map for Dom0 based on the hardware e820 map.
- */
- d->arch.e820 = xzalloc_array(struct e820entry, e820.nr_map);
- if ( !d->arch.e820 )
- panic("Unable to allocate memory for Dom0 e820 map");
- entry_guest = d->arch.e820;
-
- /* Clamp e820 memory map to match the memory assigned to Dom0 */
- for ( i = 0, entry = e820.map; i < e820.nr_map; i++, entry++ )
- {
- if ( entry->type != E820_RAM )
- {
- *entry_guest = *entry;
- goto next;
- }
-
- if ( nr_pages == cur_pages )
- {
- /*
- * We already have all the assigned memory,
- * skip this entry
- */
- continue;
- }
-
- /*
- * Make sure the start and length are aligned to PAGE_SIZE, because
- * that's the minimum granularity of the 2nd stage translation. Since
- * the p2m code uses PAGE_ORDER_4K internally, also use it here in
- * order to prevent this code from getting out of sync.
- */
- start = ROUNDUP(entry->addr, PAGE_SIZE << PAGE_ORDER_4K);
- end = (entry->addr + entry->size) &
- ~((PAGE_SIZE << PAGE_ORDER_4K) - 1);
- if ( start >= end )
- continue;
-
- entry_guest->type = E820_RAM;
- entry_guest->addr = start;
- entry_guest->size = end - start;
- pages = PFN_DOWN(entry_guest->size);
- if ( (cur_pages + pages) > nr_pages )
- {
- /* Truncate region */
- entry_guest->size = (nr_pages - cur_pages) << PAGE_SHIFT;
- cur_pages = nr_pages;
- }
- else
- {
- cur_pages += pages;
- }
- next:
- d->arch.nr_e820++;
- entry_guest++;
- }
- ASSERT(cur_pages == nr_pages);
- ASSERT(d->arch.nr_e820 <= e820.nr_map);
-}
-
-static int __init pvh_setup_p2m(struct domain *d)
-{
- struct vcpu *v = d->vcpu[0];
- unsigned long nr_pages;
- unsigned int i;
- int rc;
- bool preempted;
-#define MB1_PAGES PFN_DOWN(MB(1))
-
- nr_pages = dom0_compute_nr_pages(d, NULL, 0);
-
- pvh_setup_e820(d, nr_pages);
- do {
- preempted = false;
- paging_set_allocation(d, dom0_paging_pages(d, nr_pages),
- &preempted);
- process_pending_softirqs();
- } while ( preempted );
-
- /*
- * Memory below 1MB is identity mapped.
- * NB: this only makes sense when booted from legacy BIOS.
- */
- rc = modify_identity_mmio(d, 0, MB1_PAGES, true);
- if ( rc )
- {
- printk("Failed to identity map low 1MB: %d\n", rc);
- return rc;
- }
-
- /* Populate memory map. */
- for ( i = 0; i < d->arch.nr_e820; i++ )
- {
- unsigned long addr, size;
-
- if ( d->arch.e820[i].type != E820_RAM )
- continue;
-
- addr = PFN_DOWN(d->arch.e820[i].addr);
- size = PFN_DOWN(d->arch.e820[i].size);
-
- if ( addr >= MB1_PAGES )
- rc = pvh_populate_memory_range(d, addr, size);
- else
- {
- ASSERT(addr + size < MB1_PAGES);
- pvh_steal_low_ram(d, addr, size);
- }
-
- if ( rc )
- return rc;
- }
-
- if ( cpu_has_vmx && paging_mode_hap(d) && !vmx_unrestricted_guest(v) )
- {
- /*
- * Since Dom0 cannot be migrated, we will only setup the
- * unrestricted guest helpers if they are needed by the current
- * hardware we are running on.
- */
- rc = pvh_setup_vmx_realmode_helpers(d);
- if ( rc )
- return rc;
- }
-
- return 0;
-#undef MB1_PAGES
-}
-
-static int __init pvh_load_kernel(struct domain *d, const module_t *image,
- unsigned long image_headroom,
- module_t *initrd, void *image_base,
- char *cmdline, paddr_t *entry,
- paddr_t *start_info_addr)
-{
- void *image_start = image_base + image_headroom;
- unsigned long image_len = image->mod_end;
- struct elf_binary elf;
- struct elf_dom_parms parms;
- paddr_t last_addr;
- struct hvm_start_info start_info = { 0 };
- struct hvm_modlist_entry mod = { 0 };
- struct vcpu *v = d->vcpu[0];
- int rc;
-
- if ( (rc = bzimage_parse(image_base, &image_start, &image_len)) != 0 )
- {
- printk("Error trying to detect bz compressed kernel\n");
- return rc;
- }
-
- if ( (rc = elf_init(&elf, image_start, image_len)) != 0 )
- {
- printk("Unable to init ELF\n");
- return rc;
- }
-#ifdef VERBOSE
- elf_set_verbose(&elf);
-#endif
- elf_parse_binary(&elf);
- if ( (rc = elf_xen_parse(&elf, &parms)) != 0 )
- {
- printk("Unable to parse kernel for ELFNOTES\n");
- return rc;
- }
-
- if ( parms.phys_entry == UNSET_ADDR32 )
- {
- printk("Unable to find XEN_ELFNOTE_PHYS32_ENTRY address\n");
- return -EINVAL;
- }
-
- printk("OS: %s version: %s loader: %s bitness: %s\n", parms.guest_os,
- parms.guest_ver, parms.loader,
- elf_64bit(&elf) ? "64-bit" : "32-bit");
-
- /* Copy the OS image and free temporary buffer. */
- elf.dest_base = (void *)(parms.virt_kstart - parms.virt_base);
- elf.dest_size = parms.virt_kend - parms.virt_kstart;
-
- elf_set_vcpu(&elf, v);
- rc = elf_load_binary(&elf);
- if ( rc < 0 )
- {
- printk("Failed to load kernel: %d\n", rc);
- printk("Xen dom0 kernel broken ELF: %s\n", elf_check_broken(&elf));
- return rc;
- }
-
- last_addr = ROUNDUP(parms.virt_kend - parms.virt_base, PAGE_SIZE);
-
- if ( initrd != NULL )
- {
- rc = hvm_copy_to_guest_phys(last_addr, mfn_to_virt(initrd->mod_start),
- initrd->mod_end, v);
- if ( rc )
- {
- printk("Unable to copy initrd to guest\n");
- return rc;
- }
-
- mod.paddr = last_addr;
- mod.size = initrd->mod_end;
- last_addr += ROUNDUP(initrd->mod_end, PAGE_SIZE);
- }
-
- /* Free temporary buffers. */
- discard_initial_images();
-
- if ( cmdline != NULL )
- {
- rc = hvm_copy_to_guest_phys(last_addr, cmdline, strlen(cmdline) + 1, v);
- if ( rc )
- {
- printk("Unable to copy guest command line\n");
- return rc;
- }
- start_info.cmdline_paddr = last_addr;
- /*
- * Round up to 32/64 bits (depending on the guest kernel bitness) so
- * the modlist/start_info is aligned.
- */
- last_addr += ROUNDUP(strlen(cmdline) + 1, elf_64bit(&elf) ? 8 : 4);
- }
- if ( initrd != NULL )
- {
- rc = hvm_copy_to_guest_phys(last_addr, &mod, sizeof(mod), v);
- if ( rc )
- {
- printk("Unable to copy guest modules\n");
- return rc;
- }
- start_info.modlist_paddr = last_addr;
- start_info.nr_modules = 1;
- last_addr += sizeof(mod);
- }
-
- start_info.magic = XEN_HVM_START_MAGIC_VALUE;
- start_info.flags = SIF_PRIVILEGED | SIF_INITDOMAIN;
- rc = hvm_copy_to_guest_phys(last_addr, &start_info, sizeof(start_info), v);
- if ( rc )
- {
- printk("Unable to copy start info to guest\n");
- return rc;
- }
-
- *entry = parms.phys_entry;
- *start_info_addr = last_addr;
-
- return 0;
-}
-
-static int __init pvh_setup_cpus(struct domain *d, paddr_t entry,
- paddr_t start_info)
-{
- struct vcpu *v = d->vcpu[0];
- unsigned int cpu, i;
- int rc;
- /*
- * This sets the vCPU state according to the state described in
- * docs/misc/hvmlite.markdown.
- */
- vcpu_hvm_context_t cpu_ctx = {
- .mode = VCPU_HVM_MODE_32B,
- .cpu_regs.x86_32.ebx = start_info,
- .cpu_regs.x86_32.eip = entry,
- .cpu_regs.x86_32.cr0 = X86_CR0_PE | X86_CR0_ET,
- .cpu_regs.x86_32.cs_limit = ~0u,
- .cpu_regs.x86_32.ds_limit = ~0u,
- .cpu_regs.x86_32.ss_limit = ~0u,
- .cpu_regs.x86_32.tr_limit = 0x67,
- .cpu_regs.x86_32.cs_ar = 0xc9b,
- .cpu_regs.x86_32.ds_ar = 0xc93,
- .cpu_regs.x86_32.ss_ar = 0xc93,
- .cpu_regs.x86_32.tr_ar = 0x8b,
- };
-
- cpu = v->processor;
- for ( i = 1; i < d->max_vcpus; i++ )
- {
- cpu = cpumask_cycle(cpu, &dom0_cpus);
- dom0_setup_vcpu(d, i, cpu);
- }
-
- rc = arch_set_info_hvm_guest(v, &cpu_ctx);
- if ( rc )
- {
- printk("Unable to setup Dom0 BSP context: %d\n", rc);
- return rc;
- }
-
- rc = dom0_setup_permissions(d);
- if ( rc )
- {
- panic("Unable to setup Dom0 permissions: %d\n", rc);
- return rc;
- }
-
- update_domain_wallclock_time(d);
-
- clear_bit(_VPF_down, &v->pause_flags);
-
- return 0;
-}
-
-static int __init acpi_count_intr_ovr(struct acpi_subtable_header *header,
- const unsigned long end)
-{
-
- acpi_intr_overrides++;
- return 0;
-}
-
-static int __init acpi_set_intr_ovr(struct acpi_subtable_header *header,
- const unsigned long end)
-{
- const struct acpi_madt_interrupt_override *intr =
- container_of(header, struct acpi_madt_interrupt_override, header);
-
- *intsrcovr = *intr;
- intsrcovr++;
-
- return 0;
-}
-
-static int __init acpi_count_nmi_src(struct acpi_subtable_header *header,
- const unsigned long end)
-{
-
- acpi_nmi_sources++;
- return 0;
-}
-
-static int __init acpi_set_nmi_src(struct acpi_subtable_header *header,
- const unsigned long end)
-{
- const struct acpi_madt_nmi_source *src =
- container_of(header, struct acpi_madt_nmi_source, header);
-
- *nmisrc = *src;
- nmisrc++;
-
- return 0;
-}
-
-static int __init pvh_setup_acpi_madt(struct domain *d, paddr_t *addr)
-{
- struct acpi_table_madt *madt;
- struct acpi_table_header *table;
- struct acpi_madt_io_apic *io_apic;
- struct acpi_madt_local_x2apic *x2apic;
- acpi_status status;
- unsigned long size;
- unsigned int i, max_vcpus;
- int rc;
-
- /* Count number of interrupt overrides in the MADT. */
- acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
- acpi_count_intr_ovr, UINT_MAX);
-
- /* Count number of NMI sources in the MADT. */
- acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_count_nmi_src,
- UINT_MAX);
-
- max_vcpus = dom0_max_vcpus();
- /* Calculate the size of the crafted MADT. */
- size = sizeof(*madt);
- /*
- * FIXME: the current vIO-APIC code just supports one IO-APIC instance
- * per domain. This must be fixed in order to provide the same amount of
- * IO APICs as available on bare metal.
- */
- size += sizeof(*io_apic);
- size += sizeof(*intsrcovr) * acpi_intr_overrides;
- size += sizeof(*nmisrc) * acpi_nmi_sources;
- size += sizeof(*x2apic) * max_vcpus;
-
- madt = xzalloc_bytes(size);
- if ( !madt )
- {
- printk("Unable to allocate memory for MADT table\n");
- rc = -ENOMEM;
- goto out;
- }
-
- /* Copy the native MADT table header. */
- status = acpi_get_table(ACPI_SIG_MADT, 0, &table);
- if ( !ACPI_SUCCESS(status) )
- {
- printk("Failed to get MADT ACPI table, aborting.\n");
- rc = -EINVAL;
- goto out;
- }
- madt->header = *table;
- madt->address = APIC_DEFAULT_PHYS_BASE;
- /*
- * NB: this is currently set to 4, which is the revision in the ACPI
- * spec 6.1. Sadly ACPICA doesn't provide revision numbers for the
- * tables described in the headers.
- */
- madt->header.revision = min_t(unsigned char, table->revision, 4);
-
- /*
- * Setup the IO APIC entry.
- * FIXME: the current vIO-APIC code just supports one IO-APIC instance
- * per domain. This must be fixed in order to provide the same amount of
- * IO APICs as available on bare metal, and with the same IDs as found in
- * the native IO APIC MADT entries.
- */
- if ( nr_ioapics > 1 )
- printk("WARNING: found %d IO APICs, Dom0 will only have access to 1 emulated IO APIC\n",
- nr_ioapics);
- io_apic = (void *)(madt + 1);
- io_apic->header.type = ACPI_MADT_TYPE_IO_APIC;
- io_apic->header.length = sizeof(*io_apic);
- io_apic->id = domain_vioapic(d)->id;
- io_apic->address = VIOAPIC_DEFAULT_BASE_ADDRESS;
-
- x2apic = (void *)(io_apic + 1);
- for ( i = 0; i < max_vcpus; i++ )
- {
- x2apic->header.type = ACPI_MADT_TYPE_LOCAL_X2APIC;
- x2apic->header.length = sizeof(*x2apic);
- x2apic->uid = i;
- x2apic->local_apic_id = i * 2;
- x2apic->lapic_flags = ACPI_MADT_ENABLED;
- x2apic++;
- }
-
- /* Setup interrupt overrides. */
- intsrcovr = (void *)x2apic;
- acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_set_intr_ovr,
- acpi_intr_overrides);
-
- /* Setup NMI sources. */
- nmisrc = (void *)intsrcovr;
- acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_set_nmi_src,
- acpi_nmi_sources);
-
- ASSERT(((void *)nmisrc - (void *)madt) == size);
- madt->header.length = size;
- /*
- * Calling acpi_tb_checksum here is a layering violation, but
- * introducing a wrapper for such simple usage seems overkill.
- */
- madt->header.checksum -= acpi_tb_checksum(ACPI_CAST_PTR(u8, madt), size);
-
- /* Place the new MADT in guest memory space. */
- if ( pvh_steal_ram(d, size, 0, GB(4), addr) )
- {
- printk("Unable to find allocate guest RAM for MADT\n");
- rc = -ENOMEM;
- goto out;
- }
-
- /* Mark this region as E820_ACPI. */
- if ( pvh_add_mem_range(d, *addr, *addr + size, E820_ACPI) )
- printk("Unable to add MADT region to memory map\n");
-
- rc = hvm_copy_to_guest_phys(*addr, madt, size, d->vcpu[0]);
- if ( rc )
- {
- printk("Unable to copy MADT into guest memory\n");
- goto out;
- }
-
- rc = 0;
-
- out:
- xfree(madt);
-
- return rc;
-}
-
-static bool __init acpi_memory_banned(unsigned long address,
- unsigned long size)
-{
- unsigned long mfn, nr_pages, i;
-
- mfn = PFN_DOWN(address);
- nr_pages = PFN_UP((address & ~PAGE_MASK) + size);
- for ( i = 0 ; i < nr_pages; i++ )
- if ( !page_is_ram_type(mfn + i, RAM_TYPE_RESERVED) &&
- !page_is_ram_type(mfn + i, RAM_TYPE_ACPI) )
- return true;
-
- return false;
-}
-
-static bool __init pvh_acpi_table_allowed(const char *sig)
-{
- static const char __initconst banned_tables[][ACPI_NAME_SIZE] = {
- ACPI_SIG_HPET, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_MPST,
- ACPI_SIG_PMTT, ACPI_SIG_MADT, ACPI_SIG_DMAR};
- unsigned int i;
-
- for ( i = 0 ; i < ARRAY_SIZE(banned_tables); i++ )
- if ( strncmp(sig, banned_tables[i], ACPI_NAME_SIZE) == 0 )
- return false;
-
- /* Make sure table doesn't reside in a RAM region. */
- if ( acpi_memory_banned(acpi_gbl_root_table_list.tables[i].address,
- acpi_gbl_root_table_list.tables[i].length) )
- {
- printk("Skipping table %.4s because resides in a non-ACPI, non-reserved region\n",
- sig);
- return false;
- }
-
- return true;
-}
-
-static int __init pvh_setup_acpi_xsdt(struct domain *d, paddr_t madt_addr,
- paddr_t *addr)
-{
- struct acpi_table_xsdt *xsdt;
- struct acpi_table_header *table;
- struct acpi_table_rsdp *rsdp;
- unsigned long size = sizeof(*xsdt);
- unsigned int i, j, num_tables = 0;
- paddr_t xsdt_paddr;
- int rc;
-
- /*
- * Restore original DMAR table signature, we are going to filter it from
- * the new XSDT that is presented to the guest, so it is no longer
- * necessary to have it's signature zapped.
- */
- acpi_dmar_reinstate();
-
- /* Count the number of tables that will be added to the XSDT. */
- for( i = 0; i < acpi_gbl_root_table_list.count; i++ )
- {
- const char *sig = acpi_gbl_root_table_list.tables[i].signature.ascii;
-
- if ( pvh_acpi_table_allowed(sig) )
- num_tables++;
- }
-
- /*
- * No need to add or subtract anything because struct acpi_table_xsdt
- * includes one array slot already, and we have filtered out the original
- * MADT and we are going to add a custom built MADT.
- */
- size += num_tables * sizeof(xsdt->table_offset_entry[0]);
-
- xsdt = xzalloc_bytes(size);
- if ( !xsdt )
- {
- printk("Unable to allocate memory for XSDT table\n");
- rc = -ENOMEM;
- goto out;
- }
-
- /* Copy the native XSDT table header. */
- rsdp = acpi_os_map_memory(acpi_os_get_root_pointer(), sizeof(*rsdp));
- if ( !rsdp )
- {
- printk("Unable to map RSDP\n");
- rc = -EINVAL;
- goto out;
- }
- xsdt_paddr = rsdp->xsdt_physical_address;
- acpi_os_unmap_memory(rsdp, sizeof(*rsdp));
- table = acpi_os_map_memory(xsdt_paddr, sizeof(*table));
- if ( !table )
- {
- printk("Unable to map XSDT\n");
- rc = -EINVAL;
- goto out;
- }
- xsdt->header = *table;
- acpi_os_unmap_memory(table, sizeof(*table));
-
- /* Add the custom MADT. */
- xsdt->table_offset_entry[0] = madt_addr;
-
- /* Copy the addresses of the rest of the allowed tables. */
- for( i = 0, j = 1; i < acpi_gbl_root_table_list.count; i++ )
- {
- const char *sig = acpi_gbl_root_table_list.tables[i].signature.ascii;
-
- if ( pvh_acpi_table_allowed(sig) )
- xsdt->table_offset_entry[j++] =
- acpi_gbl_root_table_list.tables[i].address;
- }
-
- xsdt->header.revision = 1;
- xsdt->header.length = size;
- /*
- * Calling acpi_tb_checksum here is a layering violation, but
- * introducing a wrapper for such simple usage seems overkill.
- */
- xsdt->header.checksum -= acpi_tb_checksum(ACPI_CAST_PTR(u8, xsdt), size);
-
- /* Place the new XSDT in guest memory space. */
- if ( pvh_steal_ram(d, size, 0, GB(4), addr) )
- {
- printk("Unable to find guest RAM for XSDT\n");
- rc = -ENOMEM;
- goto out;
- }
-
- /* Mark this region as E820_ACPI. */
- if ( pvh_add_mem_range(d, *addr, *addr + size, E820_ACPI) )
- printk("Unable to add XSDT region to memory map\n");
-
- rc = hvm_copy_to_guest_phys(*addr, xsdt, size, d->vcpu[0]);
- if ( rc )
- {
- printk("Unable to copy XSDT into guest memory\n");
- goto out;
- }
-
- rc = 0;
-
- out:
- xfree(xsdt);
-
- return rc;
-}
-
-static int __init pvh_setup_acpi(struct domain *d, paddr_t start_info)
-{
- unsigned long pfn, nr_pages;
- paddr_t madt_paddr, xsdt_paddr, rsdp_paddr;
- unsigned int i;
- int rc;
- struct acpi_table_rsdp *native_rsdp, rsdp = {
- .signature = ACPI_SIG_RSDP,
- .revision = 2,
- .length = sizeof(rsdp),
- };
-
-
- /* Scan top-level tables and add their regions to the guest memory map. */
- for( i = 0; i < acpi_gbl_root_table_list.count; i++ )
- {
- const char *sig = acpi_gbl_root_table_list.tables[i].signature.ascii;
- unsigned long addr = acpi_gbl_root_table_list.tables[i].address;
- unsigned long size = acpi_gbl_root_table_list.tables[i].length;
-
- /*
- * Make sure the original MADT is also mapped, so that Dom0 can
- * properly access the data returned by _MAT methods in case it's
- * re-using MADT memory.
- */
- if ( strncmp(sig, ACPI_SIG_MADT, ACPI_NAME_SIZE)
- ? pvh_acpi_table_allowed(sig)
- : !acpi_memory_banned(addr, size) )
- pvh_add_mem_range(d, addr, addr + size, E820_ACPI);
- }
-
- /* Identity map ACPI e820 regions. */
- for ( i = 0; i < d->arch.nr_e820; i++ )
- {
- if ( d->arch.e820[i].type != E820_ACPI &&
- d->arch.e820[i].type != E820_NVS )
- continue;
-
- pfn = PFN_DOWN(d->arch.e820[i].addr);
- nr_pages = PFN_UP((d->arch.e820[i].addr & ~PAGE_MASK) +
- d->arch.e820[i].size);
-
- rc = modify_identity_mmio(d, pfn, nr_pages, true);
- if ( rc )
- {
- printk("Failed to map ACPI region [%#lx, %#lx) into Dom0 memory map\n",
- pfn, pfn + nr_pages);
- return rc;
- }
- }
-
- rc = pvh_setup_acpi_madt(d, &madt_paddr);
- if ( rc )
- return rc;
-
- rc = pvh_setup_acpi_xsdt(d, madt_paddr, &xsdt_paddr);
- if ( rc )
- return rc;
-
- /* Craft a custom RSDP. */
- native_rsdp = acpi_os_map_memory(acpi_os_get_root_pointer(), sizeof(rsdp));
- if ( !native_rsdp )
- {
- printk("Failed to map native RSDP\n");
- return -ENOMEM;
- }
- memcpy(rsdp.oem_id, native_rsdp->oem_id, sizeof(rsdp.oem_id));
- acpi_os_unmap_memory(native_rsdp, sizeof(rsdp));
- rsdp.xsdt_physical_address = xsdt_paddr;
- /*
- * Calling acpi_tb_checksum here is a layering violation, but
- * introducing a wrapper for such simple usage seems overkill.
- */
- rsdp.checksum -= acpi_tb_checksum(ACPI_CAST_PTR(u8, &rsdp),
- ACPI_RSDP_REV0_SIZE);
- rsdp.extended_checksum -= acpi_tb_checksum(ACPI_CAST_PTR(u8, &rsdp),
- sizeof(rsdp));
-
- /*
- * Place the new RSDP in guest memory space.
- *
- * NB: this RSDP is not going to replace the original RSDP, which should
- * still be accessible to the guest. However that RSDP is going to point to
- * the native RSDT, and should not be used for the Dom0 kernel's boot
- * purposes (we keep it visible for post boot access).
- */
- if ( pvh_steal_ram(d, sizeof(rsdp), 0, GB(4), &rsdp_paddr) )
- {
- printk("Unable to allocate guest RAM for RSDP\n");
- return -ENOMEM;
- }
-
- /* Mark this region as E820_ACPI. */
- if ( pvh_add_mem_range(d, rsdp_paddr, rsdp_paddr + sizeof(rsdp),
- E820_ACPI) )
- printk("Unable to add RSDP region to memory map\n");
-
- /* Copy RSDP into guest memory. */
- rc = hvm_copy_to_guest_phys(rsdp_paddr, &rsdp, sizeof(rsdp), d->vcpu[0]);
- if ( rc )
- {
- printk("Unable to copy RSDP into guest memory\n");
- return rc;
- }
-
- /* Copy RSDP address to start_info. */
- rc = hvm_copy_to_guest_phys(start_info +
- offsetof(struct hvm_start_info, rsdp_paddr),
- &rsdp_paddr,
- sizeof(((struct hvm_start_info *)
- 0)->rsdp_paddr),
- d->vcpu[0]);
- if ( rc )
- {
- printk("Unable to copy RSDP into guest memory\n");
- return rc;
- }
-
- return 0;
-}
-
-static int __init construct_dom0_pvh(struct domain *d, const module_t *image,
- unsigned long image_headroom,
- module_t *initrd,
- void *(*bootstrap_map)(const module_t *),
- char *cmdline)
-{
- paddr_t entry, start_info;
- int rc;
-
- printk("** Building a PVH Dom0 **\n");
-
- iommu_hwdom_init(d);
-
- rc = pvh_setup_p2m(d);
- if ( rc )
- {
- printk("Failed to setup Dom0 physical memory map\n");
- return rc;
- }
-
- rc = pvh_load_kernel(d, image, image_headroom, initrd, bootstrap_map(image),
- cmdline, &entry, &start_info);
- if ( rc )
- {
- printk("Failed to load Dom0 kernel\n");
- return rc;
- }
-
- rc = pvh_setup_cpus(d, entry, start_info);
- if ( rc )
- {
- printk("Failed to setup Dom0 CPUs: %d\n", rc);
- return rc;
- }
-
- rc = pvh_setup_acpi(d, start_info);
- if ( rc )
- {
- printk("Failed to setup Dom0 ACPI tables: %d\n", rc);
- return rc;
- }
-
- panic("Building a PVHv2 Dom0 is not yet supported.");
- return 0;
-}
-
int __init construct_dom0(struct domain *d, const module_t *image,
unsigned long image_headroom, module_t *initrd,
void *(*bootstrap_map)(const module_t *),
@@ -1546,7 +483,7 @@ int __init construct_dom0(struct domain *d, const module_t *image,
process_pending_softirqs();
- return (is_hvm_domain(d) ? construct_dom0_pvh : dom0_construct_pv)
+ return (is_hvm_domain(d) ? dom0_construct_pvh : dom0_construct_pv)
(d, image, image_headroom, initrd,bootstrap_map, cmdline);
}
diff --git a/xen/arch/x86/hvm/Makefile b/xen/arch/x86/hvm/Makefile
index ec0daae0ea..0a3d0f4f7e 100644
--- a/xen/arch/x86/hvm/Makefile
+++ b/xen/arch/x86/hvm/Makefile
@@ -3,6 +3,7 @@ subdir-y += vmx
obj-y += asid.o
obj-y += dm.o
+obj-bin-y += dom0_build.init.o
obj-y += emulate.o
obj-y += hpet.o
obj-y += hvm.o
diff --git a/xen/arch/x86/hvm/dom0_build.c b/xen/arch/x86/hvm/dom0_build.c
new file mode 100644
index 0000000000..0256054e54
--- /dev/null
+++ b/xen/arch/x86/hvm/dom0_build.c
@@ -0,0 +1,1112 @@
+/*
+ * hvm/dom0_build.c
+ *
+ * Dom0 builder for PVH guest.
+ *
+ * Copyright (C) 2017 Citrix Systems R&D
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms and conditions of the GNU General Public
+ * License, version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <xen/acpi.h>
+#include <xen/init.h>
+#include <xen/libelf.h>
+#include <xen/multiboot.h>
+#include <xen/softirq.h>
+
+#include <acpi/actables.h>
+
+#include <asm/bzimage.h>
+#include <asm/dom0_build.h>
+#include <asm/hvm/support.h>
+#include <asm/io_apic.h>
+#include <asm/p2m.h>
+#include <asm/paging.h>
+#include <asm/setup.h>
+
+#include <public/arch-x86/hvm/start_info.h>
+#include <public/hvm/hvm_info_table.h>
+#include <public/hvm/hvm_vcpu.h>
+
+/*
+ * Have the TSS cover the ISA port range, which makes it
+ * - 104 bytes base structure
+ * - 32 bytes interrupt redirection bitmap
+ * - 128 bytes I/O bitmap
+ * - one trailing byte
+ * or a total of 265 bytes.
+ *
+ * NB: as PVHv2 Dom0 doesn't have legacy devices (ISA), it shouldn't have any
+ * business in accessing the ISA port range, much less in real mode, and due to
+ * the lack of firmware it shouldn't also execute any INT instruction. This is
+ * done just for consistency with what hvmloader does.
+ */
+#define HVM_VM86_TSS_SIZE 265
+
+static unsigned int __initdata acpi_intr_overrides;
+static struct acpi_madt_interrupt_override __initdata *intsrcovr;
+
+static unsigned int __initdata acpi_nmi_sources;
+static struct acpi_madt_nmi_source __initdata *nmisrc;
+
+static int __init modify_identity_mmio(struct domain *d, unsigned long pfn,
+ unsigned long nr_pages, const bool map)
+{
+ int rc;
+
+ for ( ; ; )
+ {
+ rc = (map ? map_mmio_regions : unmap_mmio_regions)
+ (d, _gfn(pfn), nr_pages, _mfn(pfn));
+ if ( rc == 0 )
+ break;
+ if ( rc < 0 )
+ {
+ printk(XENLOG_WARNING
+ "Failed to identity %smap [%#lx,%#lx) for d%d: %d\n",
+ map ? "" : "un", pfn, pfn + nr_pages, d->domain_id, rc);
+ break;
+ }
+ nr_pages -= rc;
+ pfn += rc;
+ process_pending_softirqs();
+ }
+
+ return rc;
+}
+
+/* Populate a HVM memory range using the biggest possible order. */
+static int __init pvh_populate_memory_range(struct domain *d,
+ unsigned long start,
+ unsigned long nr_pages)
+{
+ unsigned int order, i = 0;
+ struct page_info *page;
+ int rc;
+#define MAP_MAX_ITER 64
+
+ order = MAX_ORDER;
+ while ( nr_pages != 0 )
+ {
+ unsigned int range_order = get_order_from_pages(nr_pages + 1);
+
+ order = min(range_order ? range_order - 1 : 0, order);
+ page = alloc_domheap_pages(d, order, dom0_memflags);
+ if ( page == NULL )
+ {
+ if ( order == 0 && dom0_memflags )
+ {
+ /* Try again without any dom0_memflags. */
+ dom0_memflags = 0;
+ order = MAX_ORDER;
+ continue;
+ }
+ if ( order == 0 )
+ {
+ printk("Unable to allocate memory with order 0!\n");
+ return -ENOMEM;
+ }
+ order--;
+ continue;
+ }
+
+ rc = guest_physmap_add_page(d, _gfn(start), _mfn(page_to_mfn(page)),
+ order);
+ if ( rc != 0 )
+ {
+ printk("Failed to populate memory: [%#lx,%lx): %d\n",
+ start, start + (1UL << order), rc);
+ return -ENOMEM;
+ }
+ start += 1UL << order;
+ nr_pages -= 1UL << order;
+ if ( (++i % MAP_MAX_ITER) == 0 )
+ process_pending_softirqs();
+ }
+
+ return 0;
+#undef MAP_MAX_ITER
+}
+
+/* Steal RAM from the end of a memory region. */
+static int __init pvh_steal_ram(struct domain *d, unsigned long size,
+ unsigned long align, paddr_t limit,
+ paddr_t *addr)
+{
+ unsigned int i = d->arch.nr_e820;
+
+ /*
+ * Alignment 0 should be set to 1, so it doesn't wrap around in the
+ * calculations below.
+ */
+ align = align ? : 1;
+ while ( i-- )
+ {
+ struct e820entry *entry = &d->arch.e820[i];
+
+ if ( entry->type != E820_RAM || entry->addr + entry->size > limit ||
+ entry->addr < MB(1) )
+ continue;
+
+ *addr = (entry->addr + entry->size - size) & ~(align - 1);
+ if ( *addr < entry->addr )
+ continue;
+
+ entry->size = *addr - entry->addr;
+ return 0;
+ }
+
+ return -ENOMEM;
+}
+
+/* NB: memory map must be sorted at all times for this to work correctly. */
+static int __init pvh_add_mem_range(struct domain *d, uint64_t s, uint64_t e,
+ unsigned int type)
+{
+ struct e820entry *map;
+ unsigned int i;
+
+ for ( i = 0; i < d->arch.nr_e820; i++ )
+ {
+ uint64_t rs = d->arch.e820[i].addr;
+ uint64_t re = rs + d->arch.e820[i].size;
+
+ if ( rs == e && d->arch.e820[i].type == type )
+ {
+ d->arch.e820[i].addr = s;
+ return 0;
+ }
+
+ if ( re == s && d->arch.e820[i].type == type &&
+ (i + 1 == d->arch.nr_e820 || d->arch.e820[i + 1].addr >= e) )
+ {
+ d->arch.e820[i].size += e - s;
+ return 0;
+ }
+
+ if ( rs >= e )
+ break;
+
+ if ( re > s )
+ return -EEXIST;
+ }
+
+ map = xzalloc_array(struct e820entry, d->arch.nr_e820 + 1);
+ if ( !map )
+ {
+ printk(XENLOG_WARNING "E820: out of memory to add region\n");
+ return -ENOMEM;
+ }
+
+ memcpy(map, d->arch.e820, i * sizeof(*d->arch.e820));
+ memcpy(map + i + 1, d->arch.e820 + i,
+ (d->arch.nr_e820 - i) * sizeof(*d->arch.e820));
+ map[i].addr = s;
+ map[i].size = e - s;
+ map[i].type = type;
+ xfree(d->arch.e820);
+ d->arch.e820 = map;
+ d->arch.nr_e820++;
+
+ return 0;
+}
+
+static int __init pvh_setup_vmx_realmode_helpers(struct domain *d)
+{
+ p2m_type_t p2mt;
+ uint32_t rc, *ident_pt;
+ mfn_t mfn;
+ paddr_t gaddr;
+ struct vcpu *v = d->vcpu[0];
+
+ /*
+ * Steal some space from the last RAM region below 4GB and use it to
+ * store the real-mode TSS. It needs to be aligned to 128 so that the
+ * TSS structure (which accounts for the first 104b) doesn't cross
+ * a page boundary.
+ */
+ if ( !pvh_steal_ram(d, HVM_VM86_TSS_SIZE, 128, GB(4), &gaddr) )
+ {
+ if ( hvm_copy_to_guest_phys(gaddr, NULL, HVM_VM86_TSS_SIZE, v) !=
+ HVMCOPY_okay )
+ printk("Unable to zero VM86 TSS area\n");
+ d->arch.hvm_domain.params[HVM_PARAM_VM86_TSS_SIZED] =
+ VM86_TSS_UPDATED | ((uint64_t)HVM_VM86_TSS_SIZE << 32) | gaddr;
+ if ( pvh_add_mem_range(d, gaddr, gaddr + HVM_VM86_TSS_SIZE,
+ E820_RESERVED) )
+ printk("Unable to set VM86 TSS as reserved in the memory map\n");
+ }
+ else
+ printk("Unable to allocate VM86 TSS area\n");
+
+ /* Steal some more RAM for the identity page tables. */
+ if ( pvh_steal_ram(d, PAGE_SIZE, PAGE_SIZE, GB(4), &gaddr) )
+ {
+ printk("Unable to find memory to stash the identity page tables\n");
+ return -ENOMEM;
+ }
+
+ /*
+ * Identity-map page table is required for running with CR0.PG=0
+ * when using Intel EPT. Create a 32-bit non-PAE page directory of
+ * superpages.
+ */
+ ident_pt = map_domain_gfn(p2m_get_hostp2m(d), _gfn(PFN_DOWN(gaddr)),
+ &mfn, &p2mt, 0, &rc);
+ if ( ident_pt == NULL )
+ {
+ printk("Unable to map identity page tables\n");
+ return -ENOMEM;
+ }
+ write_32bit_pse_identmap(ident_pt);
+ unmap_domain_page(ident_pt);
+ put_page(mfn_to_page(mfn_x(mfn)));
+ d->arch.hvm_domain.params[HVM_PARAM_IDENT_PT] = gaddr;
+ if ( pvh_add_mem_range(d, gaddr, gaddr + PAGE_SIZE, E820_RESERVED) )
+ printk("Unable to set identity page tables as reserved in the memory map\n");
+
+ return 0;
+}
+
+/* Assign the low 1MB to Dom0. */
+static void __init pvh_steal_low_ram(struct domain *d, unsigned long start,
+ unsigned long nr_pages)
+{
+ unsigned long mfn;
+
+ ASSERT(start + nr_pages <= PFN_DOWN(MB(1)));
+
+ for ( mfn = start; mfn < start + nr_pages; mfn++ )
+ {
+ struct page_info *pg = mfn_to_page(mfn);
+ int rc;
+
+ rc = unshare_xen_page_with_guest(pg, dom_io);
+ if ( rc )
+ {
+ printk("Unable to unshare Xen mfn %#lx: %d\n", mfn, rc);
+ continue;
+ }
+
+ share_xen_page_with_guest(pg, d, XENSHARE_writable);
+ rc = guest_physmap_add_entry(d, _gfn(mfn), _mfn(mfn), 0, p2m_ram_rw);
+ if ( rc )
+ printk("Unable to add mfn %#lx to p2m: %d\n", mfn, rc);
+ }
+}
+
+static __init void pvh_setup_e820(struct domain *d, unsigned long nr_pages)
+{
+ struct e820entry *entry, *entry_guest;
+ unsigned int i;
+ unsigned long pages, cur_pages = 0;
+ uint64_t start, end;
+
+ /*
+ * Craft the e820 memory map for Dom0 based on the hardware e820 map.
+ */
+ d->arch.e820 = xzalloc_array(struct e820entry, e820.nr_map);
+ if ( !d->arch.e820 )
+ panic("Unable to allocate memory for Dom0 e820 map");
+ entry_guest = d->arch.e820;
+
+ /* Clamp e820 memory map to match the memory assigned to Dom0 */
+ for ( i = 0, entry = e820.map; i < e820.nr_map; i++, entry++ )
+ {
+ if ( entry->type != E820_RAM )
+ {
+ *entry_guest = *entry;
+ goto next;
+ }
+
+ if ( nr_pages == cur_pages )
+ {
+ /*
+ * We already have all the assigned memory,
+ * skip this entry
+ */
+ continue;
+ }
+
+ /*
+ * Make sure the start and length are aligned to PAGE_SIZE, because
+ * that's the minimum granularity of the 2nd stage translation. Since
+ * the p2m code uses PAGE_ORDER_4K internally, also use it here in
+ * order to prevent this code from getting out of sync.
+ */
+ start = ROUNDUP(entry->addr, PAGE_SIZE << PAGE_ORDER_4K);
+ end = (entry->addr + entry->size) &
+ ~((PAGE_SIZE << PAGE_ORDER_4K) - 1);
+ if ( start >= end )
+ continue;
+
+ entry_guest->type = E820_RAM;
+ entry_guest->addr = start;
+ entry_guest->size = end - start;
+ pages = PFN_DOWN(entry_guest->size);
+ if ( (cur_pages + pages) > nr_pages )
+ {
+ /* Truncate region */
+ entry_guest->size = (nr_pages - cur_pages) << PAGE_SHIFT;
+ cur_pages = nr_pages;
+ }
+ else
+ {
+ cur_pages += pages;
+ }
+ next:
+ d->arch.nr_e820++;
+ entry_guest++;
+ }
+ ASSERT(cur_pages == nr_pages);
+ ASSERT(d->arch.nr_e820 <= e820.nr_map);
+}
+
+static int __init pvh_setup_p2m(struct domain *d)
+{
+ struct vcpu *v = d->vcpu[0];
+ unsigned long nr_pages;
+ unsigned int i;
+ int rc;
+ bool preempted;
+#define MB1_PAGES PFN_DOWN(MB(1))
+
+ nr_pages = dom0_compute_nr_pages(d, NULL, 0);
+
+ pvh_setup_e820(d, nr_pages);
+ do {
+ preempted = false;
+ paging_set_allocation(d, dom0_paging_pages(d, nr_pages),
+ &preempted);
+ process_pending_softirqs();
+ } while ( preempted );
+
+ /*
+ * Memory below 1MB is identity mapped.
+ * NB: this only makes sense when booted from legacy BIOS.
+ */
+ rc = modify_identity_mmio(d, 0, MB1_PAGES, true);
+ if ( rc )
+ {
+ printk("Failed to identity map low 1MB: %d\n", rc);
+ return rc;
+ }
+
+ /* Populate memory map. */
+ for ( i = 0; i < d->arch.nr_e820; i++ )
+ {
+ unsigned long addr, size;
+
+ if ( d->arch.e820[i].type != E820_RAM )
+ continue;
+
+ addr = PFN_DOWN(d->arch.e820[i].addr);
+ size = PFN_DOWN(d->arch.e820[i].size);
+
+ if ( addr >= MB1_PAGES )
+ rc = pvh_populate_memory_range(d, addr, size);
+ else
+ {
+ ASSERT(addr + size < MB1_PAGES);
+ pvh_steal_low_ram(d, addr, size);
+ }
+
+ if ( rc )
+ return rc;
+ }
+
+ if ( cpu_has_vmx && paging_mode_hap(d) && !vmx_unrestricted_guest(v) )
+ {
+ /*
+ * Since Dom0 cannot be migrated, we will only setup the
+ * unrestricted guest helpers if they are needed by the current
+ * hardware we are running on.
+ */
+ rc = pvh_setup_vmx_realmode_helpers(d);
+ if ( rc )
+ return rc;
+ }
+
+ return 0;
+#undef MB1_PAGES
+}
+
+static int __init pvh_load_kernel(struct domain *d, const module_t *image,
+ unsigned long image_headroom,
+ module_t *initrd, void *image_base,
+ char *cmdline, paddr_t *entry,
+ paddr_t *start_info_addr)
+{
+ void *image_start = image_base + image_headroom;
+ unsigned long image_len = image->mod_end;
+ struct elf_binary elf;
+ struct elf_dom_parms parms;
+ paddr_t last_addr;
+ struct hvm_start_info start_info = { 0 };
+ struct hvm_modlist_entry mod = { 0 };
+ struct vcpu *v = d->vcpu[0];
+ int rc;
+
+ if ( (rc = bzimage_parse(image_base, &image_start, &image_len)) != 0 )
+ {
+ printk("Error trying to detect bz compressed kernel\n");
+ return rc;
+ }
+
+ if ( (rc = elf_init(&elf, image_start, image_len)) != 0 )
+ {
+ printk("Unable to init ELF\n");
+ return rc;
+ }
+#ifdef VERBOSE
+ elf_set_verbose(&elf);
+#endif
+ elf_parse_binary(&elf);
+ if ( (rc = elf_xen_parse(&elf, &parms)) != 0 )
+ {
+ printk("Unable to parse kernel for ELFNOTES\n");
+ return rc;
+ }
+
+ if ( parms.phys_entry == UNSET_ADDR32 )
+ {
+ printk("Unable to find XEN_ELFNOTE_PHYS32_ENTRY address\n");
+ return -EINVAL;
+ }
+
+ printk("OS: %s version: %s loader: %s bitness: %s\n", parms.guest_os,
+ parms.guest_ver, parms.loader,
+ elf_64bit(&elf) ? "64-bit" : "32-bit");
+
+ /* Copy the OS image and free temporary buffer. */
+ elf.dest_base = (void *)(parms.virt_kstart - parms.virt_base);
+ elf.dest_size = parms.virt_kend - parms.virt_kstart;
+
+ elf_set_vcpu(&elf, v);
+ rc = elf_load_binary(&elf);
+ if ( rc < 0 )
+ {
+ printk("Failed to load kernel: %d\n", rc);
+ printk("Xen dom0 kernel broken ELF: %s\n", elf_check_broken(&elf));
+ return rc;
+ }
+
+ last_addr = ROUNDUP(parms.virt_kend - parms.virt_base, PAGE_SIZE);
+
+ if ( initrd != NULL )
+ {
+ rc = hvm_copy_to_guest_phys(last_addr, mfn_to_virt(initrd->mod_start),
+ initrd->mod_end, v);
+ if ( rc )
+ {
+ printk("Unable to copy initrd to guest\n");
+ return rc;
+ }
+
+ mod.paddr = last_addr;
+ mod.size = initrd->mod_end;
+ last_addr += ROUNDUP(initrd->mod_end, PAGE_SIZE);
+ }
+
+ /* Free temporary buffers. */
+ discard_initial_images();
+
+ if ( cmdline != NULL )
+ {
+ rc = hvm_copy_to_guest_phys(last_addr, cmdline, strlen(cmdline) + 1, v);
+ if ( rc )
+ {
+ printk("Unable to copy guest command line\n");
+ return rc;
+ }
+ start_info.cmdline_paddr = last_addr;
+ /*
+ * Round up to 32/64 bits (depending on the guest kernel bitness) so
+ * the modlist/start_info is aligned.
+ */
+ last_addr += ROUNDUP(strlen(cmdline) + 1, elf_64bit(&elf) ? 8 : 4);
+ }
+ if ( initrd != NULL )
+ {
+ rc = hvm_copy_to_guest_phys(last_addr, &mod, sizeof(mod), v);
+ if ( rc )
+ {
+ printk("Unable to copy guest modules\n");
+ return rc;
+ }
+ start_info.modlist_paddr = last_addr;
+ start_info.nr_modules = 1;
+ last_addr += sizeof(mod);
+ }
+
+ start_info.magic = XEN_HVM_START_MAGIC_VALUE;
+ start_info.flags = SIF_PRIVILEGED | SIF_INITDOMAIN;
+ rc = hvm_copy_to_guest_phys(last_addr, &start_info, sizeof(start_info), v);
+ if ( rc )
+ {
+ printk("Unable to copy start info to guest\n");
+ return rc;
+ }
+
+ *entry = parms.phys_entry;
+ *start_info_addr = last_addr;
+
+ return 0;
+}
+
+static int __init pvh_setup_cpus(struct domain *d, paddr_t entry,
+ paddr_t start_info)
+{
+ struct vcpu *v = d->vcpu[0];
+ unsigned int cpu, i;
+ int rc;
+ /*
+ * This sets the vCPU state according to the state described in
+ * docs/misc/hvmlite.markdown.
+ */
+ vcpu_hvm_context_t cpu_ctx = {
+ .mode = VCPU_HVM_MODE_32B,
+ .cpu_regs.x86_32.ebx = start_info,
+ .cpu_regs.x86_32.eip = entry,
+ .cpu_regs.x86_32.cr0 = X86_CR0_PE | X86_CR0_ET,
+ .cpu_regs.x86_32.cs_limit = ~0u,
+ .cpu_regs.x86_32.ds_limit = ~0u,
+ .cpu_regs.x86_32.ss_limit = ~0u,
+ .cpu_regs.x86_32.tr_limit = 0x67,
+ .cpu_regs.x86_32.cs_ar = 0xc9b,
+ .cpu_regs.x86_32.ds_ar = 0xc93,
+ .cpu_regs.x86_32.ss_ar = 0xc93,
+ .cpu_regs.x86_32.tr_ar = 0x8b,
+ };
+
+ cpu = v->processor;
+ for ( i = 1; i < d->max_vcpus; i++ )
+ {
+ cpu = cpumask_cycle(cpu, &dom0_cpus);
+ dom0_setup_vcpu(d, i, cpu);
+ }
+
+ rc = arch_set_info_hvm_guest(v, &cpu_ctx);
+ if ( rc )
+ {
+ printk("Unable to setup Dom0 BSP context: %d\n", rc);
+ return rc;
+ }
+
+ rc = dom0_setup_permissions(d);
+ if ( rc )
+ {
+ panic("Unable to setup Dom0 permissions: %d\n", rc);
+ return rc;
+ }
+
+ update_domain_wallclock_time(d);
+
+ clear_bit(_VPF_down, &v->pause_flags);
+
+ return 0;
+}
+
+static int __init acpi_count_intr_ovr(struct acpi_subtable_header *header,
+ const unsigned long end)
+{
+
+ acpi_intr_overrides++;
+ return 0;
+}
+
+static int __init acpi_set_intr_ovr(struct acpi_subtable_header *header,
+ const unsigned long end)
+{
+ const struct acpi_madt_interrupt_override *intr =
+ container_of(header, struct acpi_madt_interrupt_override, header);
+
+ *intsrcovr = *intr;
+ intsrcovr++;
+
+ return 0;
+}
+
+static int __init acpi_count_nmi_src(struct acpi_subtable_header *header,
+ const unsigned long end)
+{
+
+ acpi_nmi_sources++;
+ return 0;
+}
+
+static int __init acpi_set_nmi_src(struct acpi_subtable_header *header,
+ const unsigned long end)
+{
+ const struct acpi_madt_nmi_source *src =
+ container_of(header, struct acpi_madt_nmi_source, header);
+
+ *nmisrc = *src;
+ nmisrc++;
+
+ return 0;
+}
+
+static int __init pvh_setup_acpi_madt(struct domain *d, paddr_t *addr)
+{
+ struct acpi_table_madt *madt;
+ struct acpi_table_header *table;
+ struct acpi_madt_io_apic *io_apic;
+ struct acpi_madt_local_x2apic *x2apic;
+ acpi_status status;
+ unsigned long size;
+ unsigned int i, max_vcpus;
+ int rc;
+
+ /* Count number of interrupt overrides in the MADT. */
+ acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
+ acpi_count_intr_ovr, UINT_MAX);
+
+ /* Count number of NMI sources in the MADT. */
+ acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_count_nmi_src,
+ UINT_MAX);
+
+ max_vcpus = dom0_max_vcpus();
+ /* Calculate the size of the crafted MADT. */
+ size = sizeof(*madt);
+ /*
+ * FIXME: the current vIO-APIC code just supports one IO-APIC instance
+ * per domain. This must be fixed in order to provide the same amount of
+ * IO APICs as available on bare metal.
+ */
+ size += sizeof(*io_apic);
+ size += sizeof(*intsrcovr) * acpi_intr_overrides;
+ size += sizeof(*nmisrc) * acpi_nmi_sources;
+ size += sizeof(*x2apic) * max_vcpus;
+
+ madt = xzalloc_bytes(size);
+ if ( !madt )
+ {
+ printk("Unable to allocate memory for MADT table\n");
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ /* Copy the native MADT table header. */
+ status = acpi_get_table(ACPI_SIG_MADT, 0, &table);
+ if ( !ACPI_SUCCESS(status) )
+ {
+ printk("Failed to get MADT ACPI table, aborting.\n");
+ rc = -EINVAL;
+ goto out;
+ }
+ madt->header = *table;
+ madt->address = APIC_DEFAULT_PHYS_BASE;
+ /*
+ * NB: this is currently set to 4, which is the revision in the ACPI
+ * spec 6.1. Sadly ACPICA doesn't provide revision numbers for the
+ * tables described in the headers.
+ */
+ madt->header.revision = min_t(unsigned char, table->revision, 4);
+
+ /*
+ * Setup the IO APIC entry.
+ * FIXME: the current vIO-APIC code just supports one IO-APIC instance
+ * per domain. This must be fixed in order to provide the same amount of
+ * IO APICs as available on bare metal, and with the same IDs as found in
+ * the native IO APIC MADT entries.
+ */
+ if ( nr_ioapics > 1 )
+ printk("WARNING: found %d IO APICs, Dom0 will only have access to 1 emulated IO APIC\n",
+ nr_ioapics);
+ io_apic = (void *)(madt + 1);
+ io_apic->header.type = ACPI_MADT_TYPE_IO_APIC;
+ io_apic->header.length = sizeof(*io_apic);
+ io_apic->id = domain_vioapic(d)->id;
+ io_apic->address = VIOAPIC_DEFAULT_BASE_ADDRESS;
+
+ x2apic = (void *)(io_apic + 1);
+ for ( i = 0; i < max_vcpus; i++ )
+ {
+ x2apic->header.type = ACPI_MADT_TYPE_LOCAL_X2APIC;
+ x2apic->header.length = sizeof(*x2apic);
+ x2apic->uid = i;
+ x2apic->local_apic_id = i * 2;
+ x2apic->lapic_flags = ACPI_MADT_ENABLED;
+ x2apic++;
+ }
+
+ /* Setup interrupt overrides. */
+ intsrcovr = (void *)x2apic;
+ acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_set_intr_ovr,
+ acpi_intr_overrides);
+
+ /* Setup NMI sources. */
+ nmisrc = (void *)intsrcovr;
+ acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_set_nmi_src,
+ acpi_nmi_sources);
+
+ ASSERT(((void *)nmisrc - (void *)madt) == size);
+ madt->header.length = size;
+ /*
+ * Calling acpi_tb_checksum here is a layering violation, but
+ * introducing a wrapper for such simple usage seems overkill.
+ */
+ madt->header.checksum -= acpi_tb_checksum(ACPI_CAST_PTR(u8, madt), size);
+
+ /* Place the new MADT in guest memory space. */
+ if ( pvh_steal_ram(d, size, 0, GB(4), addr) )
+ {
+ printk("Unable to find allocate guest RAM for MADT\n");
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ /* Mark this region as E820_ACPI. */
+ if ( pvh_add_mem_range(d, *addr, *addr + size, E820_ACPI) )
+ printk("Unable to add MADT region to memory map\n");
+
+ rc = hvm_copy_to_guest_phys(*addr, madt, size, d->vcpu[0]);
+ if ( rc )
+ {
+ printk("Unable to copy MADT into guest memory\n");
+ goto out;
+ }
+
+ rc = 0;
+
+ out:
+ xfree(madt);
+
+ return rc;
+}
+
+static bool __init acpi_memory_banned(unsigned long address,
+ unsigned long size)
+{
+ unsigned long mfn, nr_pages, i;
+
+ mfn = PFN_DOWN(address);
+ nr_pages = PFN_UP((address & ~PAGE_MASK) + size);
+ for ( i = 0 ; i < nr_pages; i++ )
+ if ( !page_is_ram_type(mfn + i, RAM_TYPE_RESERVED) &&
+ !page_is_ram_type(mfn + i, RAM_TYPE_ACPI) )
+ return true;
+
+ return false;
+}
+
+static bool __init pvh_acpi_table_allowed(const char *sig)
+{
+ static const char __initconst banned_tables[][ACPI_NAME_SIZE] = {
+ ACPI_SIG_HPET, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_MPST,
+ ACPI_SIG_PMTT, ACPI_SIG_MADT, ACPI_SIG_DMAR};
+ unsigned int i;
+
+ for ( i = 0 ; i < ARRAY_SIZE(banned_tables); i++ )
+ if ( strncmp(sig, banned_tables[i], ACPI_NAME_SIZE) == 0 )
+ return false;
+
+ /* Make sure table doesn't reside in a RAM region. */
+ if ( acpi_memory_banned(acpi_gbl_root_table_list.tables[i].address,
+ acpi_gbl_root_table_list.tables[i].length) )
+ {
+ printk("Skipping table %.4s because resides in a non-ACPI, non-reserved region\n",
+ sig);
+ return false;
+ }
+
+ return true;
+}
+
+static int __init pvh_setup_acpi_xsdt(struct domain *d, paddr_t madt_addr,
+ paddr_t *addr)
+{
+ struct acpi_table_xsdt *xsdt;
+ struct acpi_table_header *table;
+ struct acpi_table_rsdp *rsdp;
+ unsigned long size = sizeof(*xsdt);
+ unsigned int i, j, num_tables = 0;
+ paddr_t xsdt_paddr;
+ int rc;
+
+ /*
+ * Restore original DMAR table signature, we are going to filter it from
+ * the new XSDT that is presented to the guest, so it is no longer
+ * necessary to have it's signature zapped.
+ */
+ acpi_dmar_reinstate();
+
+ /* Count the number of tables that will be added to the XSDT. */
+ for( i = 0; i < acpi_gbl_root_table_list.count; i++ )
+ {
+ const char *sig = acpi_gbl_root_table_list.tables[i].signature.ascii;
+
+ if ( pvh_acpi_table_allowed(sig) )
+ num_tables++;
+ }
+
+ /*
+ * No need to add or subtract anything because struct acpi_table_xsdt
+ * includes one array slot already, and we have filtered out the original
+ * MADT and we are going to add a custom built MADT.
+ */
+ size += num_tables * sizeof(xsdt->table_offset_entry[0]);
+
+ xsdt = xzalloc_bytes(size);
+ if ( !xsdt )
+ {
+ printk("Unable to allocate memory for XSDT table\n");
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ /* Copy the native XSDT table header. */
+ rsdp = acpi_os_map_memory(acpi_os_get_root_pointer(), sizeof(*rsdp));
+ if ( !rsdp )
+ {
+ printk("Unable to map RSDP\n");
+ rc = -EINVAL;
+ goto out;
+ }
+ xsdt_paddr = rsdp->xsdt_physical_address;
+ acpi_os_unmap_memory(rsdp, sizeof(*rsdp));
+ table = acpi_os_map_memory(xsdt_paddr, sizeof(*table));
+ if ( !table )
+ {
+ printk("Unable to map XSDT\n");
+ rc = -EINVAL;
+ goto out;
+ }
+ xsdt->header = *table;
+ acpi_os_unmap_memory(table, sizeof(*table));
+
+ /* Add the custom MADT. */
+ xsdt->table_offset_entry[0] = madt_addr;
+
+ /* Copy the addresses of the rest of the allowed tables. */
+ for( i = 0, j = 1; i < acpi_gbl_root_table_list.count; i++ )
+ {
+ const char *sig = acpi_gbl_root_table_list.tables[i].signature.ascii;
+
+ if ( pvh_acpi_table_allowed(sig) )
+ xsdt->table_offset_entry[j++] =
+ acpi_gbl_root_table_list.tables[i].address;
+ }
+
+ xsdt->header.revision = 1;
+ xsdt->header.length = size;
+ /*
+ * Calling acpi_tb_checksum here is a layering violation, but
+ * introducing a wrapper for such simple usage seems overkill.
+ */
+ xsdt->header.checksum -= acpi_tb_checksum(ACPI_CAST_PTR(u8, xsdt), size);
+
+ /* Place the new XSDT in guest memory space. */
+ if ( pvh_steal_ram(d, size, 0, GB(4), addr) )
+ {
+ printk("Unable to find guest RAM for XSDT\n");
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ /* Mark this region as E820_ACPI. */
+ if ( pvh_add_mem_range(d, *addr, *addr + size, E820_ACPI) )
+ printk("Unable to add XSDT region to memory map\n");
+
+ rc = hvm_copy_to_guest_phys(*addr, xsdt, size, d->vcpu[0]);
+ if ( rc )
+ {
+ printk("Unable to copy XSDT into guest memory\n");
+ goto out;
+ }
+
+ rc = 0;
+
+ out:
+ xfree(xsdt);
+
+ return rc;
+}
+
+static int __init pvh_setup_acpi(struct domain *d, paddr_t start_info)
+{
+ unsigned long pfn, nr_pages;
+ paddr_t madt_paddr, xsdt_paddr, rsdp_paddr;
+ unsigned int i;
+ int rc;
+ struct acpi_table_rsdp *native_rsdp, rsdp = {
+ .signature = ACPI_SIG_RSDP,
+ .revision = 2,
+ .length = sizeof(rsdp),
+ };
+
+
+ /* Scan top-level tables and add their regions to the guest memory map. */
+ for( i = 0; i < acpi_gbl_root_table_list.count; i++ )
+ {
+ const char *sig = acpi_gbl_root_table_list.tables[i].signature.ascii;
+ unsigned long addr = acpi_gbl_root_table_list.tables[i].address;
+ unsigned long size = acpi_gbl_root_table_list.tables[i].length;
+
+ /*
+ * Make sure the original MADT is also mapped, so that Dom0 can
+ * properly access the data returned by _MAT methods in case it's
+ * re-using MADT memory.
+ */
+ if ( strncmp(sig, ACPI_SIG_MADT, ACPI_NAME_SIZE)
+ ? pvh_acpi_table_allowed(sig)
+ : !acpi_memory_banned(addr, size) )
+ pvh_add_mem_range(d, addr, addr + size, E820_ACPI);
+ }
+
+ /* Identity map ACPI e820 regions. */
+ for ( i = 0; i < d->arch.nr_e820; i++ )
+ {
+ if ( d->arch.e820[i].type != E820_ACPI &&
+ d->arch.e820[i].type != E820_NVS )
+ continue;
+
+ pfn = PFN_DOWN(d->arch.e820[i].addr);
+ nr_pages = PFN_UP((d->arch.e820[i].addr & ~PAGE_MASK) +
+ d->arch.e820[i].size);
+
+ rc = modify_identity_mmio(d, pfn, nr_pages, true);
+ if ( rc )
+ {
+ printk("Failed to map ACPI region [%#lx, %#lx) into Dom0 memory map\n",
+ pfn, pfn + nr_pages);
+ return rc;
+ }
+ }
+
+ rc = pvh_setup_acpi_madt(d, &madt_paddr);
+ if ( rc )
+ return rc;
+
+ rc = pvh_setup_acpi_xsdt(d, madt_paddr, &xsdt_paddr);
+ if ( rc )
+ return rc;
+
+ /* Craft a custom RSDP. */
+ native_rsdp = acpi_os_map_memory(acpi_os_get_root_pointer(), sizeof(rsdp));
+ if ( !native_rsdp )
+ {
+ printk("Failed to map native RSDP\n");
+ return -ENOMEM;
+ }
+ memcpy(rsdp.oem_id, native_rsdp->oem_id, sizeof(rsdp.oem_id));
+ acpi_os_unmap_memory(native_rsdp, sizeof(rsdp));
+ rsdp.xsdt_physical_address = xsdt_paddr;
+ /*
+ * Calling acpi_tb_checksum here is a layering violation, but
+ * introducing a wrapper for such simple usage seems overkill.
+ */
+ rsdp.checksum -= acpi_tb_checksum(ACPI_CAST_PTR(u8, &rsdp),
+ ACPI_RSDP_REV0_SIZE);
+ rsdp.extended_checksum -= acpi_tb_checksum(ACPI_CAST_PTR(u8, &rsdp),
+ sizeof(rsdp));
+
+ /*
+ * Place the new RSDP in guest memory space.
+ *
+ * NB: this RSDP is not going to replace the original RSDP, which should
+ * still be accessible to the guest. However that RSDP is going to point to
+ * the native RSDT, and should not be used for the Dom0 kernel's boot
+ * purposes (we keep it visible for post boot access).
+ */
+ if ( pvh_steal_ram(d, sizeof(rsdp), 0, GB(4), &rsdp_paddr) )
+ {
+ printk("Unable to allocate guest RAM for RSDP\n");
+ return -ENOMEM;
+ }
+
+ /* Mark this region as E820_ACPI. */
+ if ( pvh_add_mem_range(d, rsdp_paddr, rsdp_paddr + sizeof(rsdp),
+ E820_ACPI) )
+ printk("Unable to add RSDP region to memory map\n");
+
+ /* Copy RSDP into guest memory. */
+ rc = hvm_copy_to_guest_phys(rsdp_paddr, &rsdp, sizeof(rsdp), d->vcpu[0]);
+ if ( rc )
+ {
+ printk("Unable to copy RSDP into guest memory\n");
+ return rc;
+ }
+
+ /* Copy RSDP address to start_info. */
+ rc = hvm_copy_to_guest_phys(start_info +
+ offsetof(struct hvm_start_info, rsdp_paddr),
+ &rsdp_paddr,
+ sizeof(((struct hvm_start_info *)
+ 0)->rsdp_paddr),
+ d->vcpu[0]);
+ if ( rc )
+ {
+ printk("Unable to copy RSDP into guest memory\n");
+ return rc;
+ }
+
+ return 0;
+}
+
+int __init dom0_construct_pvh(struct domain *d, const module_t *image,
+ unsigned long image_headroom,
+ module_t *initrd,
+ void *(*bootstrap_map)(const module_t *),
+ char *cmdline)
+{
+ paddr_t entry, start_info;
+ int rc;
+
+ printk("** Building a PVH Dom0 **\n");
+
+ iommu_hwdom_init(d);
+
+ rc = pvh_setup_p2m(d);
+ if ( rc )
+ {
+ printk("Failed to setup Dom0 physical memory map\n");
+ return rc;
+ }
+
+ rc = pvh_load_kernel(d, image, image_headroom, initrd, bootstrap_map(image),
+ cmdline, &entry, &start_info);
+ if ( rc )
+ {
+ printk("Failed to load Dom0 kernel\n");
+ return rc;
+ }
+
+ rc = pvh_setup_cpus(d, entry, start_info);
+ if ( rc )
+ {
+ printk("Failed to setup Dom0 CPUs: %d\n", rc);
+ return rc;
+ }
+
+ rc = pvh_setup_acpi(d, start_info);
+ if ( rc )
+ {
+ printk("Failed to setup Dom0 ACPI tables: %d\n", rc);
+ return rc;
+ }
+
+ panic("Building a PVHv2 Dom0 is not yet supported.");
+ return 0;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/include/asm-x86/dom0_build.h b/xen/include/asm-x86/dom0_build.h
index 2ba349e445..09cd8cb240 100644
--- a/xen/include/asm-x86/dom0_build.h
+++ b/xen/include/asm-x86/dom0_build.h
@@ -19,6 +19,15 @@ int dom0_construct_pv(
void *(*bootstrap_map)(const module_t *),
char *cmdline);
+int dom0_construct_pvh(struct domain *d, const module_t *image,
+ unsigned long image_headroom,
+ module_t *initrd,
+ void *(*bootstrap_map)(const module_t *),
+ char *cmdline);
+
+unsigned long dom0_paging_pages(const struct domain *d,
+ unsigned long nr_pages);
+
#endif /* _DOM0_BUILD_H_ */
/*
--
2.11.0
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