[PATCH 0/6] grub-xen: support booting huge pv-domains

[PATCH 0/6] grub-xen: support booting huge pv-domains

[Juergen Gross]

The Xen hypervisor supports starting a dom0 with large memory (up to
the TB range) by not including the initrd and p2m list in the initial
kernel mapping. Especially the p2m list can grow larger than the
available virtual space in the initial mapping.

The started kernel is indicating the support of each feature via
elf notes.

This series enables grub-xen to do the same as the hypervisor.

Tested with:
- 32 bit domU (kernel not supporting unmapped initrd)
- 32 bit domU (kernel supporting unmapped initrd)
- 1 GB 64 bit domU (kernel supporting unmapped initrd, not p2m)
- 1 GB 64 bit domU (kernel supporting unmapped initrd and p2m)
- 900GB 64 bit domU (kernel supporting unmapped initrd and p2m)


Juergen Gross (6):
  xen: factor out p2m list allocation into separate function
  xen: factor out allocation of special pages into separate function
  xen: factor out allocation of page tables into separate function
  xen: add capability to load initrd outside of initial mapping
  xen: modify page table construction
  xen: add capability to load p2m list outside of kernel mapping

 grub-core/lib/i386/xen/relocator.S   |  47 ++--
 grub-core/lib/x86_64/xen/relocator.S |  41 ++-
 grub-core/lib/xen/relocator.c        |  22 +-
 grub-core/loader/i386/xen.c          | 521 +++++++++++++++++++++++++----------
 grub-core/loader/i386/xen_fileXX.c   |   7 +
 include/grub/xen/relocator.h         |   6 +-
 include/grub/xen_file.h              |   3 +
 7 files changed, 446 insertions(+), 201 deletions(-)

-- 
2.1.4

[PATCH 1/6] xen: factor out p2m list allocation into separate function

[Juergen Gross]

Do the p2m list allocation of the to be loaded kernel in a separate
function. This will allow doing the p2m list allocation at different
times of the boot preparations depending on the features the kernel
is supporting.

While at this remove superfluous setting of first_p2m_pfn and
nr_p2m_frames as those are needed only in case of the p2m list not
being mapped by the initial kernel mapping.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
 grub-core/loader/i386/xen.c | 70 ++++++++++++++++++++++++++-------------------
 1 file changed, 40 insertions(+), 30 deletions(-)

diff --git a/grub-core/loader/i386/xen.c b/grub-core/loader/i386/xen.c
index c4d9689..42ed7c7 100644
--- a/grub-core/loader/i386/xen.c
+++ b/grub-core/loader/i386/xen.c
@@ -52,6 +52,8 @@ static struct grub_xen_file_info xen_inf;
 static struct xen_multiboot_mod_list *xen_module_info_page;
 static grub_uint64_t modules_target_start;
 static grub_size_t n_modules;
+static struct grub_relocator_xen_state state;
+static grub_xen_mfn_t *virt_mfn_list;
 
 #define PAGE_SIZE 4096
 #define MAX_MODULES (PAGE_SIZE / sizeof (struct xen_multiboot_mod_list))
@@ -166,7 +168,7 @@ generate_page_table (grub_uint64_t *where, grub_uint64_t paging_start,
 }
 
 static grub_err_t
-set_mfns (grub_xen_mfn_t * new_mfn_list, grub_xen_mfn_t pfn)
+set_mfns (grub_xen_mfn_t pfn)
 {
   grub_xen_mfn_t i, t;
   grub_xen_mfn_t cn_pfn = -1, st_pfn = -1;
@@ -175,32 +177,32 @@ set_mfns (grub_xen_mfn_t * new_mfn_list, grub_xen_mfn_t pfn)
 
   for (i = 0; i < grub_xen_start_page_addr->nr_pages; i++)
     {
-      if (new_mfn_list[i] == grub_xen_start_page_addr->console.domU.mfn)
+      if (virt_mfn_list[i] == grub_xen_start_page_addr->console.domU.mfn)
 	cn_pfn = i;
-      if (new_mfn_list[i] == grub_xen_start_page_addr->store_mfn)
+      if (virt_mfn_list[i] == grub_xen_start_page_addr->store_mfn)
 	st_pfn = i;
     }
   if (cn_pfn == (grub_xen_mfn_t)-1)
     return grub_error (GRUB_ERR_BUG, "no console");
   if (st_pfn == (grub_xen_mfn_t)-1)
     return grub_error (GRUB_ERR_BUG, "no store");
-  t = new_mfn_list[pfn];
-  new_mfn_list[pfn] = new_mfn_list[cn_pfn];
-  new_mfn_list[cn_pfn] = t;
-  t = new_mfn_list[pfn + 1];
-  new_mfn_list[pfn + 1] = new_mfn_list[st_pfn];
-  new_mfn_list[st_pfn] = t;
-
-  m2p_updates[0].ptr = page2offset (new_mfn_list[pfn]) | MMU_MACHPHYS_UPDATE;
+  t = virt_mfn_list[pfn];
+  virt_mfn_list[pfn] = virt_mfn_list[cn_pfn];
+  virt_mfn_list[cn_pfn] = t;
+  t = virt_mfn_list[pfn + 1];
+  virt_mfn_list[pfn + 1] = virt_mfn_list[st_pfn];
+  virt_mfn_list[st_pfn] = t;
+
+  m2p_updates[0].ptr = page2offset (virt_mfn_list[pfn]) | MMU_MACHPHYS_UPDATE;
   m2p_updates[0].val = pfn;
   m2p_updates[1].ptr =
-    page2offset (new_mfn_list[pfn + 1]) | MMU_MACHPHYS_UPDATE;
+    page2offset (virt_mfn_list[pfn + 1]) | MMU_MACHPHYS_UPDATE;
   m2p_updates[1].val = pfn + 1;
   m2p_updates[2].ptr =
-    page2offset (new_mfn_list[cn_pfn]) | MMU_MACHPHYS_UPDATE;
+    page2offset (virt_mfn_list[cn_pfn]) | MMU_MACHPHYS_UPDATE;
   m2p_updates[2].val = cn_pfn;
   m2p_updates[3].ptr =
-    page2offset (new_mfn_list[st_pfn]) | MMU_MACHPHYS_UPDATE;
+    page2offset (virt_mfn_list[st_pfn]) | MMU_MACHPHYS_UPDATE;
   m2p_updates[3].val = st_pfn;
 
   grub_xen_mmu_update (m2p_updates, 4, NULL, DOMID_SELF);
@@ -209,34 +211,43 @@ set_mfns (grub_xen_mfn_t * new_mfn_list, grub_xen_mfn_t pfn)
 }
 
 static grub_err_t
+grub_xen_p2m_alloc (void)
+{
+  grub_relocator_chunk_t ch;
+  grub_size_t p2msize;
+  grub_err_t err;
+
+  state.mfn_list = max_addr;
+  next_start.mfn_list = max_addr + xen_inf.virt_base;
+  p2msize = sizeof (grub_xen_mfn_t) * grub_xen_start_page_addr->nr_pages;
+  err = grub_relocator_alloc_chunk_addr (relocator, &ch, max_addr, p2msize);
+  if (err)
+    return err;
+  virt_mfn_list = get_virtual_current_address (ch);
+  grub_memcpy (virt_mfn_list,
+	       (void *) grub_xen_start_page_addr->mfn_list, p2msize);
+  max_addr = ALIGN_UP (max_addr + p2msize, PAGE_SIZE);
+
+  return GRUB_ERR_NONE;
+}
+
+static grub_err_t
 grub_xen_boot (void)
 {
-  struct grub_relocator_xen_state state;
   grub_relocator_chunk_t ch;
   grub_err_t err;
-  grub_size_t pgtsize;
   struct start_info *nst;
   grub_uint64_t nr_info_pages;
   grub_uint64_t nr_pages, nr_pt_pages, nr_need_pages;
   struct gnttab_set_version gnttab_setver;
-  grub_xen_mfn_t *new_mfn_list;
   grub_size_t i;
 
   if (grub_xen_n_allocated_shared_pages)
     return grub_error (GRUB_ERR_BUG, "active grants");
 
-  state.mfn_list = max_addr;
-  next_start.mfn_list = max_addr + xen_inf.virt_base;
-  next_start.first_p2m_pfn = max_addr >> PAGE_SHIFT;	/* Is this right? */
-  pgtsize = sizeof (grub_xen_mfn_t) * grub_xen_start_page_addr->nr_pages;
-  err = grub_relocator_alloc_chunk_addr (relocator, &ch, max_addr, pgtsize);
-  next_start.nr_p2m_frames = (pgtsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
+  err = grub_xen_p2m_alloc ();
   if (err)
     return err;
-  new_mfn_list = get_virtual_current_address (ch);
-  grub_memcpy (new_mfn_list,
-	       (void *) grub_xen_start_page_addr->mfn_list, pgtsize);
-  max_addr = ALIGN_UP (max_addr + pgtsize, PAGE_SIZE);
 
   err = grub_relocator_alloc_chunk_addr (relocator, &ch,
 					 max_addr, sizeof (next_start));
@@ -254,7 +265,7 @@ grub_xen_boot (void)
   next_start.console.domU = grub_xen_start_page_addr->console.domU;
   next_start.shared_info = grub_xen_start_page_addr->shared_info;
 
-  err = set_mfns (new_mfn_list, max_addr >> PAGE_SHIFT);
+  err = set_mfns (max_addr >> PAGE_SHIFT);
   if (err)
     return err;
   max_addr += 2 * PAGE_SIZE;
@@ -288,13 +299,12 @@ grub_xen_boot (void)
 
   generate_page_table (get_virtual_current_address (ch),
 		       max_addr >> PAGE_SHIFT, nr_pages,
-		       xen_inf.virt_base, new_mfn_list);
+		       xen_inf.virt_base, virt_mfn_list);
 
   max_addr += page2offset (nr_pt_pages);
   state.stack = max_addr + STACK_SIZE + xen_inf.virt_base;
   state.entry_point = xen_inf.entry_point;
 
-  next_start.nr_p2m_frames += nr_pt_pages;
   next_start.nr_pt_frames = nr_pt_pages;
   state.paging_size = nr_pt_pages;
 
-- 
2.1.4

[PATCH 2/6] xen: factor out allocation of special pages into separate function

[Juergen Gross]

Do the allocation of special pages (start info, console and xenbus
ring buffers) in a separate function. This will allow to do the
allocation at different times of the boot preparations depending on
the features the kernel is supporting.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
 grub-core/loader/i386/xen.c | 50 +++++++++++++++++++++++++++++----------------
 1 file changed, 32 insertions(+), 18 deletions(-)

diff --git a/grub-core/loader/i386/xen.c b/grub-core/loader/i386/xen.c
index 42ed7c7..e48cc3f 100644
--- a/grub-core/loader/i386/xen.c
+++ b/grub-core/loader/i386/xen.c
@@ -54,6 +54,8 @@ static grub_uint64_t modules_target_start;
 static grub_size_t n_modules;
 static struct grub_relocator_xen_state state;
 static grub_xen_mfn_t *virt_mfn_list;
+static struct start_info *virt_start_info;
+static grub_xen_mfn_t console_pfn;
 
 #define PAGE_SIZE 4096
 #define MAX_MODULES (PAGE_SIZE / sizeof (struct xen_multiboot_mod_list))
@@ -232,43 +234,51 @@ grub_xen_p2m_alloc (void)
 }
 
 static grub_err_t
-grub_xen_boot (void)
+grub_xen_special_alloc (void)
 {
   grub_relocator_chunk_t ch;
   grub_err_t err;
-  struct start_info *nst;
-  grub_uint64_t nr_info_pages;
-  grub_uint64_t nr_pages, nr_pt_pages, nr_need_pages;
-  struct gnttab_set_version gnttab_setver;
-  grub_size_t i;
-
-  if (grub_xen_n_allocated_shared_pages)
-    return grub_error (GRUB_ERR_BUG, "active grants");
-
-  err = grub_xen_p2m_alloc ();
-  if (err)
-    return err;
 
   err = grub_relocator_alloc_chunk_addr (relocator, &ch,
 					 max_addr, sizeof (next_start));
   if (err)
     return err;
   state.start_info = max_addr + xen_inf.virt_base;
-  nst = get_virtual_current_address (ch);
+  virt_start_info = get_virtual_current_address (ch);
   max_addr = ALIGN_UP (max_addr + sizeof (next_start), PAGE_SIZE);
+  console_pfn = max_addr >> PAGE_SHIFT;
+  max_addr += 2 * PAGE_SIZE;
 
   next_start.nr_pages = grub_xen_start_page_addr->nr_pages;
   grub_memcpy (next_start.magic, grub_xen_start_page_addr->magic,
 	       sizeof (next_start.magic));
+  next_start.shared_info = grub_xen_start_page_addr->shared_info;
   next_start.store_mfn = grub_xen_start_page_addr->store_mfn;
   next_start.store_evtchn = grub_xen_start_page_addr->store_evtchn;
   next_start.console.domU = grub_xen_start_page_addr->console.domU;
-  next_start.shared_info = grub_xen_start_page_addr->shared_info;
 
-  err = set_mfns (max_addr >> PAGE_SHIFT);
+  return GRUB_ERR_NONE;
+}
+
+static grub_err_t
+grub_xen_boot (void)
+{
+  grub_relocator_chunk_t ch;
+  grub_err_t err;
+  grub_uint64_t nr_info_pages;
+  grub_uint64_t nr_pages, nr_pt_pages, nr_need_pages;
+  struct gnttab_set_version gnttab_setver;
+  grub_size_t i;
+
+  if (grub_xen_n_allocated_shared_pages)
+    return grub_error (GRUB_ERR_BUG, "active grants");
+
+  err = grub_xen_p2m_alloc ();
+  if (err)
+    return err;
+  err = grub_xen_special_alloc ();
   if (err)
     return err;
-  max_addr += 2 * PAGE_SIZE;
 
   next_start.pt_base = max_addr + xen_inf.virt_base;
   state.paging_start = max_addr >> PAGE_SHIFT;
@@ -297,6 +307,10 @@ grub_xen_boot (void)
   if (err)
     return err;
 
+  err = set_mfns (console_pfn);
+  if (err)
+    return err;
+
   generate_page_table (get_virtual_current_address (ch),
 		       max_addr >> PAGE_SHIFT, nr_pages,
 		       xen_inf.virt_base, virt_mfn_list);
@@ -308,7 +322,7 @@ grub_xen_boot (void)
   next_start.nr_pt_frames = nr_pt_pages;
   state.paging_size = nr_pt_pages;
 
-  *nst = next_start;
+  *virt_start_info = next_start;
 
   grub_memset (&gnttab_setver, 0, sizeof (gnttab_setver));
 
-- 
2.1.4

[PATCH 3/6] xen: factor out allocation of page tables into separate function

[Juergen Gross]

Do the allocation of page tables in a separate function. This will
allow to do the allocation at different times of the boot preparations
depending on the features the kernel is supporting.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
 grub-core/loader/i386/xen.c | 82 ++++++++++++++++++++++++++++-----------------
 1 file changed, 51 insertions(+), 31 deletions(-)

diff --git a/grub-core/loader/i386/xen.c b/grub-core/loader/i386/xen.c
index e48cc3f..65cec27 100644
--- a/grub-core/loader/i386/xen.c
+++ b/grub-core/loader/i386/xen.c
@@ -56,6 +56,9 @@ static struct grub_relocator_xen_state state;
 static grub_xen_mfn_t *virt_mfn_list;
 static struct start_info *virt_start_info;
 static grub_xen_mfn_t console_pfn;
+static grub_uint64_t *virt_pgtable;
+static grub_uint64_t pgtbl_start;
+static grub_uint64_t pgtbl_end;
 
 #define PAGE_SIZE 4096
 #define MAX_MODULES (PAGE_SIZE / sizeof (struct xen_multiboot_mod_list))
@@ -106,17 +109,17 @@ get_pgtable_size (grub_uint64_t total_pages, grub_uint64_t virt_base)
 
 static void
 generate_page_table (grub_uint64_t *where, grub_uint64_t paging_start,
-		     grub_uint64_t total_pages, grub_uint64_t virt_base,
-		     grub_xen_mfn_t *mfn_list)
+		     grub_uint64_t paging_end, grub_uint64_t total_pages,
+		     grub_uint64_t virt_base, grub_xen_mfn_t *mfn_list)
 {
   if (!virt_base)
-    total_pages++;
+    paging_end++;
 
   grub_uint64_t lx[NUMBER_OF_LEVELS], lxs[NUMBER_OF_LEVELS];
   grub_uint64_t nlx, nls, sz = 0;
   int l;
 
-  nlx = total_pages;
+  nlx = paging_end;
   nls = virt_base >> PAGE_SHIFT;
   for (l = 0; l < NUMBER_OF_LEVELS; l++)
     {
@@ -160,7 +163,7 @@ generate_page_table (grub_uint64_t *where, grub_uint64_t paging_start,
   if (pr)
     pg += POINTERS_PER_PAGE;
 
-  for (j = 0; j < total_pages; j++)
+  for (j = 0; j < paging_end; j++)
     {
       if (j >= paging_start && j < lp)
 	pg[j + lxs[0]] = page2offset (mfn_list[j]) | 5;
@@ -261,24 +264,12 @@ grub_xen_special_alloc (void)
 }
 
 static grub_err_t
-grub_xen_boot (void)
+grub_xen_pt_alloc (void)
 {
   grub_relocator_chunk_t ch;
   grub_err_t err;
   grub_uint64_t nr_info_pages;
   grub_uint64_t nr_pages, nr_pt_pages, nr_need_pages;
-  struct gnttab_set_version gnttab_setver;
-  grub_size_t i;
-
-  if (grub_xen_n_allocated_shared_pages)
-    return grub_error (GRUB_ERR_BUG, "active grants");
-
-  err = grub_xen_p2m_alloc ();
-  if (err)
-    return err;
-  err = grub_xen_special_alloc ();
-  if (err)
-    return err;
 
   next_start.pt_base = max_addr + xen_inf.virt_base;
   state.paging_start = max_addr >> PAGE_SHIFT;
@@ -298,30 +289,59 @@ grub_xen_boot (void)
       nr_pages = nr_need_pages;
     }
 
-  grub_dprintf ("xen", "bootstrap domain %llx+%llx\n",
-		(unsigned long long) xen_inf.virt_base,
-		(unsigned long long) page2offset (nr_pages));
-
   err = grub_relocator_alloc_chunk_addr (relocator, &ch,
 					 max_addr, page2offset (nr_pt_pages));
   if (err)
     return err;
 
+  virt_pgtable = get_virtual_current_address (ch);
+  pgtbl_start = max_addr >> PAGE_SHIFT;
+  max_addr += page2offset (nr_pt_pages);
+  state.stack = max_addr + STACK_SIZE + xen_inf.virt_base;
+  state.paging_size = nr_pt_pages;
+  next_start.nr_pt_frames = nr_pt_pages;
+  max_addr = page2offset (nr_pages);
+  pgtbl_end = nr_pages;
+
+  return GRUB_ERR_NONE;
+}
+
+static grub_err_t
+grub_xen_boot (void)
+{
+  grub_err_t err;
+  grub_uint64_t nr_pages;
+  struct gnttab_set_version gnttab_setver;
+  grub_size_t i;
+
+  if (grub_xen_n_allocated_shared_pages)
+    return grub_error (GRUB_ERR_BUG, "active grants");
+
+  err = grub_xen_p2m_alloc ();
+  if (err)
+    return err;
+  err = grub_xen_special_alloc ();
+  if (err)
+    return err;
+  err = grub_xen_pt_alloc ();
+  if (err)
+    return err;
+
   err = set_mfns (console_pfn);
   if (err)
     return err;
 
-  generate_page_table (get_virtual_current_address (ch),
-		       max_addr >> PAGE_SHIFT, nr_pages,
+  nr_pages = max_addr >> PAGE_SHIFT;
+
+  grub_dprintf ("xen", "bootstrap domain %llx+%llx\n",
+		(unsigned long long) xen_inf.virt_base,
+		(unsigned long long) page2offset (nr_pages));
+
+  generate_page_table (virt_pgtable, pgtbl_start, pgtbl_end, nr_pages,
 		       xen_inf.virt_base, virt_mfn_list);
 
-  max_addr += page2offset (nr_pt_pages);
-  state.stack = max_addr + STACK_SIZE + xen_inf.virt_base;
   state.entry_point = xen_inf.entry_point;
 
-  next_start.nr_pt_frames = nr_pt_pages;
-  state.paging_size = nr_pt_pages;
-
   *virt_start_info = next_start;
 
   grub_memset (&gnttab_setver, 0, sizeof (gnttab_setver));
@@ -335,8 +355,8 @@ grub_xen_boot (void)
   return grub_relocator_xen_boot (relocator, state, nr_pages,
 				  xen_inf.virt_base <
 				  PAGE_SIZE ? page2offset (nr_pages) : 0,
-				  nr_pages - 1,
-				  page2offset (nr_pages - 1) +
+				  pgtbl_end - 1,
+				  page2offset (pgtbl_end - 1) +
 				  xen_inf.virt_base);
 }
 
-- 
2.1.4

[PATCH 4/6] xen: add capability to load initrd outside of initial mapping

[Juergen Gross]

Modern pvops linux kernels support an initrd not covered by the initial
mapping. This capability is flagged by an elf-note.

In case the elf-note is set by the kernel don't place the initrd into
the initial mapping. This will allow to load larger initrds and/or
support domains with larger memory, as the initial mapping is limited
to 2GB and it is containing the p2m list.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
 grub-core/loader/i386/xen.c        | 56 ++++++++++++++++++++++++++++++--------
 grub-core/loader/i386/xen_fileXX.c |  3 ++
 include/grub/xen_file.h            |  1 +
 3 files changed, 49 insertions(+), 11 deletions(-)

diff --git a/grub-core/loader/i386/xen.c b/grub-core/loader/i386/xen.c
index 65cec27..0f41048 100644
--- a/grub-core/loader/i386/xen.c
+++ b/grub-core/loader/i386/xen.c
@@ -307,15 +307,14 @@ grub_xen_pt_alloc (void)
 }
 
 static grub_err_t
-grub_xen_boot (void)
+grub_xen_alloc_end (void)
 {
   grub_err_t err;
-  grub_uint64_t nr_pages;
-  struct gnttab_set_version gnttab_setver;
-  grub_size_t i;
+  static int called = 0;
 
-  if (grub_xen_n_allocated_shared_pages)
-    return grub_error (GRUB_ERR_BUG, "active grants");
+  if (called)
+    return GRUB_ERR_NONE;
+  called = 1;
 
   err = grub_xen_p2m_alloc ();
   if (err)
@@ -327,6 +326,24 @@ grub_xen_boot (void)
   if (err)
     return err;
 
+  return GRUB_ERR_NONE;
+}
+
+static grub_err_t
+grub_xen_boot (void)
+{
+  grub_err_t err;
+  grub_uint64_t nr_pages;
+  struct gnttab_set_version gnttab_setver;
+  grub_size_t i;
+
+  if (grub_xen_n_allocated_shared_pages)
+    return grub_error (GRUB_ERR_BUG, "active grants");
+
+  err = grub_xen_alloc_end ();
+  if (err)
+    return err;
+
   err = set_mfns (console_pfn);
   if (err)
     return err;
@@ -587,6 +604,13 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
       goto fail;
     }
 
+  if (xen_inf.unmapped_initrd)
+    {
+      err = grub_xen_alloc_end ();
+      if (err)
+        goto fail;
+    }
+
   if (grub_initrd_init (argc, argv, &initrd_ctx))
     goto fail;
 
@@ -603,13 +627,22 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
 	goto fail;
     }
 
-  next_start.mod_start = max_addr + xen_inf.virt_base;
-  next_start.mod_len = size;
-
-  max_addr = ALIGN_UP (max_addr + size, PAGE_SIZE);
+  if (xen_inf.unmapped_initrd)
+    {
+      next_start.flags |= SIF_MOD_START_PFN;
+      next_start.mod_start = max_addr >> PAGE_SHIFT;
+      next_start.mod_len = size;
+    }
+  else
+    {
+      next_start.mod_start = max_addr + xen_inf.virt_base;
+      next_start.mod_len = size;
+    }
 
   grub_dprintf ("xen", "Initrd, addr=0x%x, size=0x%x\n",
-		(unsigned) next_start.mod_start, (unsigned) size);
+		(unsigned) (max_addr + xen_inf.virt_base), (unsigned) size);
+
+  max_addr = ALIGN_UP (max_addr + size, PAGE_SIZE);
 
 fail:
   grub_initrd_close (&initrd_ctx);
@@ -660,6 +693,7 @@ grub_cmd_module (grub_command_t cmd __attribute__ ((unused)),
 
   if (!xen_module_info_page)
     {
+      xen_inf.unmapped_initrd = 0;
       n_modules = 0;
       max_addr = ALIGN_UP (max_addr, PAGE_SIZE);
       modules_target_start = max_addr;
diff --git a/grub-core/loader/i386/xen_fileXX.c b/grub-core/loader/i386/xen_fileXX.c
index 1ba5649..69fccd2 100644
--- a/grub-core/loader/i386/xen_fileXX.c
+++ b/grub-core/loader/i386/xen_fileXX.c
@@ -253,6 +253,9 @@ parse_note (grub_elf_t elf, struct grub_xen_file_info *xi,
 					  descsz == 2 ? 2 : 3) == 0)
 	    xi->arch = GRUB_XEN_FILE_I386;
 	  break;
+	case 16:
+	  xi->unmapped_initrd = !!grub_le_to_cpu32(*(grub_uint32_t *) desc);
+	  break;
 	default:
 	  grub_dprintf ("xen", "unknown note type %d\n", nh->n_type);
 	  break;
diff --git a/include/grub/xen_file.h b/include/grub/xen_file.h
index 4b2ccba..ed749fa 100644
--- a/include/grub/xen_file.h
+++ b/include/grub/xen_file.h
@@ -36,6 +36,7 @@ struct grub_xen_file_info
   int has_note;
   int has_xen_guest;
   int extended_cr3;
+  int unmapped_initrd;
   enum
   {
     GRUB_XEN_FILE_I386 = 1,
-- 
2.1.4

[PATCH 5/6] xen: modify page table construction

[Juergen Gross]

Modify the page table construction to allow multiple virtual regions
to be mapped. This is done as preparation for removing the p2m list
from the initial kernel mapping in order to support huge pv domains.

This allows a cleaner approach for mapping the relocator page by
using this capability.

The interface to the assembler level of the relocator has to be changed
in order to be able to process multiple page table areas.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
 grub-core/lib/i386/xen/relocator.S   |  47 +++---
 grub-core/lib/x86_64/xen/relocator.S |  41 +++--
 grub-core/lib/xen/relocator.c        |  22 ++-
 grub-core/loader/i386/xen.c          | 313 +++++++++++++++++++++++------------
 include/grub/xen/relocator.h         |   6 +-
 5 files changed, 276 insertions(+), 153 deletions(-)

diff --git a/grub-core/lib/i386/xen/relocator.S b/grub-core/lib/i386/xen/relocator.S
index 694a54c..c23b405 100644
--- a/grub-core/lib/i386/xen/relocator.S
+++ b/grub-core/lib/i386/xen/relocator.S
@@ -50,41 +50,45 @@ VARIABLE(grub_relocator_xen_remapper_map_high)
 	jmp *%ebx
 
 LOCAL(cont):
-	xorl	%eax, %eax
-	movl	%eax, %ebp
+	/* mov imm32, %eax */
+	.byte	0xb8
+VARIABLE(grub_relocator_xen_paging_areas_addr)
+	.long	0
+	movl	%eax, %ebx
 1:
-
+	movl	0(%ebx), %ebp
+	movl	4(%ebx), %ecx
+	testl	%ecx, %ecx
+	jz	3f
+	addl	$8, %ebx
+	movl	%ebx, %esp
+
+2:
+	movl	%ecx, %edi
 	/* mov imm32, %eax */
 	.byte	0xb8
 VARIABLE(grub_relocator_xen_mfn_list)
 	.long	0
-	movl	%eax, %edi
-	movl	%ebp, %eax
-	movl    0(%edi, %eax, 4), %ecx
-
-	/* mov imm32, %ebx */
-	.byte	0xbb
-VARIABLE(grub_relocator_xen_paging_start)
-	.long	0
-	shll	$12, %eax
-	addl	%eax, %ebx
+	movl    0(%eax, %ebp, 4), %ecx
+	movl	%ebp, %ebx
+	shll	$12, %ebx
 	movl    %ecx, %edx
 	shll    $12,  %ecx
 	shrl    $20,  %edx
 	orl     $5, %ecx
 	movl    $2, %esi
 	movl    $__HYPERVISOR_update_va_mapping, %eax
-	int     $0x82
+	int     $0x82	/* parameters: eax, ebx, ecx, edx, esi */
 
 	incl	%ebp
-	/* mov imm32, %ecx */
-	.byte	0xb9
-VARIABLE(grub_relocator_xen_paging_size)
-	.long	0
-	cmpl	%ebp, %ecx
+	movl	%edi, %ecx
+
+	loop	2b
 
-	ja	1b
+	mov	%esp, %ebx
+	jmp	1b
 
+3:
 	/* mov imm32, %ebx */
 	.byte	0xbb
 VARIABLE(grub_relocator_xen_mmu_op_addr)
@@ -102,6 +106,9 @@ VARIABLE(grub_relocator_xen_remap_continue)
 
 	jmp *%eax
 
+VARIABLE(grub_relocator_xen_paging_areas)
+	.long	0, 0, 0, 0, 0, 0, 0, 0
+
 VARIABLE(grub_relocator_xen_mmu_op)
 	.space 256
 
diff --git a/grub-core/lib/x86_64/xen/relocator.S b/grub-core/lib/x86_64/xen/relocator.S
index 78c1233..dbb90c7 100644
--- a/grub-core/lib/x86_64/xen/relocator.S
+++ b/grub-core/lib/x86_64/xen/relocator.S
@@ -50,31 +50,24 @@ VARIABLE(grub_relocator_xen_remapper_map)
 
 LOCAL(cont):
 	
-	/* mov imm64, %rcx */
-	.byte 	0x48
-	.byte	0xb9
-VARIABLE(grub_relocator_xen_paging_size)
-	.quad	0
-
-	/* mov imm64, %rax */
-	.byte 	0x48
-	.byte	0xb8
-VARIABLE(grub_relocator_xen_paging_start)
-	.quad	0
-
-	movq	%rax, %r12
-
 	/* mov imm64, %rax */
 	.byte 	0x48
 	.byte	0xb8
 VARIABLE(grub_relocator_xen_mfn_list)
 	.quad	0
 
-	movq	%rax, %rsi
+	movq	%rax, %rbx
+	leaq	EXT_C(grub_relocator_xen_paging_areas) (%rip), %r8
+
 1:
+	movq	0(%r8), %r12
+	movq	8(%r8), %rcx
+	testq	%rcx, %rcx
+	jz	3f
+2:
 	movq	%r12, %rdi
-	movq    %rsi, %rbx
-	movq    0(%rsi), %rsi
+	shlq	$12, %rdi
+	movq    (%rbx, %r12, 8), %rsi
 	shlq    $12,  %rsi
 	orq     $5, %rsi
 	movq    $2, %rdx
@@ -83,12 +76,14 @@ VARIABLE(grub_relocator_xen_mfn_list)
 	syscall
 
 	movq    %r9, %rcx
-	addq    $8, %rbx
-	addq    $4096, %r12
-	movq    %rbx, %rsi
+	incq	%r12
+
+	loop 2b
 
-	loop 1b
+	addq	$16, %r8
+	jmp	1b
 
+3:
 	leaq   EXT_C(grub_relocator_xen_mmu_op) (%rip), %rdi
 	movq   $3, %rsi
 	movq   $0, %rdx
@@ -104,6 +99,10 @@ VARIABLE(grub_relocator_xen_remap_continue)
 
 	jmp *%rax
 
+VARIABLE(grub_relocator_xen_paging_areas)
+	/* array of start, size pairs, size 0 is end marker */
+	.quad	0, 0, 0, 0, 0, 0, 0, 0
+
 VARIABLE(grub_relocator_xen_mmu_op)
 	.space 256
 
diff --git a/grub-core/lib/xen/relocator.c b/grub-core/lib/xen/relocator.c
index 8f427d3..bc29055 100644
--- a/grub-core/lib/xen/relocator.c
+++ b/grub-core/lib/xen/relocator.c
@@ -36,15 +36,15 @@ extern grub_uint8_t grub_relocator_xen_remap_end;
 extern grub_xen_reg_t grub_relocator_xen_stack;
 extern grub_xen_reg_t grub_relocator_xen_start_info;
 extern grub_xen_reg_t grub_relocator_xen_entry_point;
-extern grub_xen_reg_t grub_relocator_xen_paging_start;
-extern grub_xen_reg_t grub_relocator_xen_paging_size;
 extern grub_xen_reg_t grub_relocator_xen_remapper_virt;
 extern grub_xen_reg_t grub_relocator_xen_remapper_virt2;
 extern grub_xen_reg_t grub_relocator_xen_remapper_map;
 extern grub_xen_reg_t grub_relocator_xen_mfn_list;
+extern grub_xen_reg_t grub_relocator_xen_paging_areas[2 * XEN_MAX_MAPPINGS];
 extern grub_xen_reg_t grub_relocator_xen_remap_continue;
 #ifdef __i386__
 extern grub_xen_reg_t grub_relocator_xen_mmu_op_addr;
+extern grub_xen_reg_t grub_relocator_xen_paging_areas_addr;
 extern grub_xen_reg_t grub_relocator_xen_remapper_map_high;
 #endif
 extern mmuext_op_t grub_relocator_xen_mmu_op[3];
@@ -61,6 +61,7 @@ grub_relocator_xen_boot (struct grub_relocator *rel,
 {
   grub_err_t err;
   void *relst;
+  int i;
   grub_relocator_chunk_t ch, ch_tramp;
   grub_xen_mfn_t *mfn_list =
     (grub_xen_mfn_t *) grub_xen_start_page_addr->mfn_list;
@@ -77,8 +78,11 @@ grub_relocator_xen_boot (struct grub_relocator *rel,
   grub_relocator_xen_stack = state.stack;
   grub_relocator_xen_start_info = state.start_info;
   grub_relocator_xen_entry_point = state.entry_point;
-  grub_relocator_xen_paging_start = state.paging_start << 12;
-  grub_relocator_xen_paging_size = state.paging_size;
+  for (i = 0; i < XEN_MAX_MAPPINGS; i++)
+    {
+      grub_relocator_xen_paging_areas[2 * i] = state.paging_start[i];
+      grub_relocator_xen_paging_areas[2 * i + 1] = state.paging_size[i];
+    }
   grub_relocator_xen_remapper_virt = remapper_virt;
   grub_relocator_xen_remapper_virt2 = remapper_virt;
   grub_relocator_xen_remap_continue = trampoline_virt;
@@ -88,10 +92,12 @@ grub_relocator_xen_boot (struct grub_relocator *rel,
   grub_relocator_xen_remapper_map_high = (mfn_list[remapper_pfn] >> 20);
   grub_relocator_xen_mmu_op_addr = (char *) &grub_relocator_xen_mmu_op
     - (char *) &grub_relocator_xen_remap_start + remapper_virt;
+  grub_relocator_xen_paging_areas_addr =
+    (char *) &grub_relocator_xen_paging_areas
+    - (char *) &grub_relocator_xen_remap_start + remapper_virt;
 #endif
 
-  grub_relocator_xen_mfn_list = state.mfn_list
-    + state.paging_start * sizeof (grub_addr_t);
+  grub_relocator_xen_mfn_list = state.mfn_list;
 
   grub_memset (grub_relocator_xen_mmu_op, 0,
 	       sizeof (grub_relocator_xen_mmu_op));
@@ -100,9 +106,9 @@ grub_relocator_xen_boot (struct grub_relocator *rel,
 #else
   grub_relocator_xen_mmu_op[0].cmd = MMUEXT_PIN_L4_TABLE;
 #endif
-  grub_relocator_xen_mmu_op[0].arg1.mfn = mfn_list[state.paging_start];
+  grub_relocator_xen_mmu_op[0].arg1.mfn = mfn_list[state.paging_start[0]];
   grub_relocator_xen_mmu_op[1].cmd = MMUEXT_NEW_BASEPTR;
-  grub_relocator_xen_mmu_op[1].arg1.mfn = mfn_list[state.paging_start];
+  grub_relocator_xen_mmu_op[1].arg1.mfn = mfn_list[state.paging_start[0]];
   grub_relocator_xen_mmu_op[2].cmd = MMUEXT_UNPIN_TABLE;
   grub_relocator_xen_mmu_op[2].arg1.mfn =
     mfn_list[grub_xen_start_page_addr->pt_base >> 12];
diff --git a/grub-core/loader/i386/xen.c b/grub-core/loader/i386/xen.c
index 0f41048..5e10420 100644
--- a/grub-core/loader/i386/xen.c
+++ b/grub-core/loader/i386/xen.c
@@ -42,6 +42,29 @@
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
+#ifdef __x86_64__
+#define NUMBER_OF_LEVELS 4
+#define INTERMEDIATE_OR 7
+#define VIRT_MASK 0x0000ffffffffffffULL
+#else
+#define NUMBER_OF_LEVELS 3
+#define INTERMEDIATE_OR 3
+#define VIRT_MASK 0x00000000ffffffffULL
+#endif
+
+struct grub_xen_mapping_lvl {
+  grub_uint64_t virt_start;
+  grub_uint64_t virt_end;
+  grub_uint64_t pfn_start;
+  grub_uint64_t n_pt_pages;
+};
+
+struct grub_xen_mapping {
+  grub_uint64_t *where;
+  struct grub_xen_mapping_lvl area;
+  struct grub_xen_mapping_lvl lvls[NUMBER_OF_LEVELS];
+};
+
 static struct grub_relocator *relocator = NULL;
 static grub_uint64_t max_addr;
 static grub_dl_t my_mod;
@@ -56,9 +79,10 @@ static struct grub_relocator_xen_state state;
 static grub_xen_mfn_t *virt_mfn_list;
 static struct start_info *virt_start_info;
 static grub_xen_mfn_t console_pfn;
-static grub_uint64_t *virt_pgtable;
-static grub_uint64_t pgtbl_start;
 static grub_uint64_t pgtbl_end;
+static struct grub_xen_mapping mappings[XEN_MAX_MAPPINGS];
+static int n_mappings;
+static struct grub_xen_mapping *map_reloc;
 
 #define PAGE_SIZE 4096
 #define MAX_MODULES (PAGE_SIZE / sizeof (struct xen_multiboot_mod_list))
@@ -75,100 +99,162 @@ page2offset (grub_uint64_t page)
   return page << PAGE_SHIFT;
 }
 
-#ifdef __x86_64__
-#define NUMBER_OF_LEVELS 4
-#define INTERMEDIATE_OR 7
-#else
-#define NUMBER_OF_LEVELS 3
-#define INTERMEDIATE_OR 3
-#endif
-
-static grub_uint64_t
-get_pgtable_size (grub_uint64_t total_pages, grub_uint64_t virt_base)
+static grub_err_t
+get_pgtable_size (grub_uint64_t from, grub_uint64_t to, grub_uint64_t pfn)
 {
-  if (!virt_base)
-    total_pages++;
-  grub_uint64_t ret = 0;
-  grub_uint64_t ll = total_pages;
-  int i;
-  for (i = 0; i < NUMBER_OF_LEVELS; i++)
-    {
-      ll = (ll + POINTERS_PER_PAGE - 1) >> LOG_POINTERS_PER_PAGE;
-      /* PAE wants all 4 root directories present.  */
-#ifdef __i386__
-      if (i == 1)
-	ll = 4;
-#endif
-      ret += ll;
-    }
-  for (i = 1; i < NUMBER_OF_LEVELS; i++)
-    if (virt_base >> (PAGE_SHIFT + i * LOG_POINTERS_PER_PAGE))
-      ret++;
-  return ret;
-}
+  struct grub_xen_mapping *map, *map_cmp;
+  grub_uint64_t mask, bits;
+  int i, m;
 
-static void
-generate_page_table (grub_uint64_t *where, grub_uint64_t paging_start,
-		     grub_uint64_t paging_end, grub_uint64_t total_pages,
-		     grub_uint64_t virt_base, grub_xen_mfn_t *mfn_list)
-{
-  if (!virt_base)
-    paging_end++;
+  if (n_mappings == XEN_MAX_MAPPINGS)
+    return grub_error (GRUB_ERR_BUG, "too many mapped areas");
+
+  grub_dprintf ("xen", "get_pgtable_size %d from=%llx, to=%llx, pfn=%llx\n",
+		n_mappings, (unsigned long long) from, (unsigned long long) to,
+		(unsigned long long) pfn);
 
-  grub_uint64_t lx[NUMBER_OF_LEVELS], lxs[NUMBER_OF_LEVELS];
-  grub_uint64_t nlx, nls, sz = 0;
-  int l;
+  map = mappings + n_mappings;
+  grub_memset (map, 0, sizeof (*map));
 
-  nlx = paging_end;
-  nls = virt_base >> PAGE_SHIFT;
-  for (l = 0; l < NUMBER_OF_LEVELS; l++)
+  map->area.virt_start = from & VIRT_MASK;
+  map->area.virt_end = (to - 1) & VIRT_MASK;
+  map->area.n_pt_pages = 0;
+
+  for (i = NUMBER_OF_LEVELS - 1; i >= 0; i--)
     {
-      nlx = (nlx + POINTERS_PER_PAGE - 1) >> LOG_POINTERS_PER_PAGE;
-      /* PAE wants all 4 root directories present.  */
+      map->lvls[i].pfn_start = pfn + map->area.n_pt_pages;
+      if (i == NUMBER_OF_LEVELS - 1)
+	{
+	  if (n_mappings == 0)
+	    {
+	      map->lvls[i].virt_start = 0;
+	      map->lvls[i].virt_end = VIRT_MASK;
+	      map->lvls[i].n_pt_pages = 1;
+	      map->area.n_pt_pages++;
+	    }
+	  continue;
+	}
+
+      bits = PAGE_SHIFT + (i + 1) * LOG_POINTERS_PER_PAGE;
+      mask = (1ULL << bits) - 1;
+      map->lvls[i].virt_start = map->area.virt_start & ~mask;
+      map->lvls[i].virt_end = map->area.virt_end | mask;
 #ifdef __i386__
-      if (l == 1)
-	nlx = 4;
+      /* PAE wants last root directory present. */
+      if (i == 1 && to <= 0xc0000000 && n_mappings == 0)
+	map->lvls[i].virt_end = VIRT_MASK;
 #endif
-      lx[l] = nlx;
-      sz += lx[l];
-      lxs[l] = nls & (POINTERS_PER_PAGE - 1);
-      if (nls && l != 0)
-	sz++;
-      nls >>= LOG_POINTERS_PER_PAGE;
+      for (m = 0; m < n_mappings; m++)
+	{
+	  map_cmp = mappings + m;
+	  if (map_cmp->lvls[i].virt_start == map_cmp->lvls[i].virt_end)
+	    continue;
+	  if (map->lvls[i].virt_start >= map_cmp->lvls[i].virt_start &&
+	      map->lvls[i].virt_end <= map_cmp->lvls[i].virt_end)
+	   {
+	     map->lvls[i].virt_start = 0;
+	     map->lvls[i].virt_end = 0;
+	     break;
+	   }
+	   if (map->lvls[i].virt_start >= map_cmp->lvls[i].virt_start &&
+	       map->lvls[i].virt_start <= map_cmp->lvls[i].virt_end)
+	     map->lvls[i].virt_start = map_cmp->lvls[i].virt_end + 1;
+	   if (map->lvls[i].virt_end >= map_cmp->lvls[i].virt_start &&
+	       map->lvls[i].virt_end <= map_cmp->lvls[i].virt_end)
+	     map->lvls[i].virt_end = map_cmp->lvls[i].virt_start - 1;
+	}
+      if (map->lvls[i].virt_start < map->lvls[i].virt_end)
+	map->lvls[i].n_pt_pages =
+	  ((map->lvls[i].virt_end - map->lvls[i].virt_start) >> bits) + 1;
+      map->area.n_pt_pages += map->lvls[i].n_pt_pages;
+      grub_dprintf ("xen", "get_pgtable_size level %d: virt %llx-%llx %d pts\n",
+		    i, (unsigned long long)  map->lvls[i].virt_start,
+		    (unsigned long long)  map->lvls[i].virt_end,
+		    (int) map->lvls[i].n_pt_pages);
     }
 
-  grub_uint64_t lp;
-  grub_uint64_t j;
-  grub_uint64_t *pg = (grub_uint64_t *) where;
-  int pr = 0;
+  grub_dprintf ("xen", "get_pgtable_size return: %d page tables\n",
+		(int) map->area.n_pt_pages);
+
+  state.paging_start[n_mappings] = pfn;
+  state.paging_size[n_mappings] = map->area.n_pt_pages;
+
+  return GRUB_ERR_NONE;
+}
+
+static grub_uint64_t *
+get_pg_table_virt (int mapping, int level)
+{
+  grub_uint64_t pfn;
+  struct grub_xen_mapping *map;
+
+  map = mappings + mapping;
+  pfn = map->lvls[level].pfn_start - map->lvls[NUMBER_OF_LEVELS - 1].pfn_start;
+  return map->where + pfn * POINTERS_PER_PAGE;
+}
 
-  grub_memset (pg, 0, sz * PAGE_SIZE);
+static grub_uint64_t
+get_pg_table_prot (int level, grub_uint64_t pfn)
+{
+  int m;
+  grub_uint64_t pfn_s, pfn_e;
 
-  lp = paging_start + lx[NUMBER_OF_LEVELS - 1];
-  for (l = NUMBER_OF_LEVELS - 1; l >= 1; l--)
+  if (level > 0)
+    return INTERMEDIATE_OR;
+  for (m = 0; m < n_mappings; m++)
     {
-      if (lxs[l] || pr)
-	pg[0] = page2offset (mfn_list[lp++]) | INTERMEDIATE_OR;
-      if (pr)
-	pg += POINTERS_PER_PAGE;
-      for (j = 0; j < lx[l - 1]; j++)
-	pg[j + lxs[l]] = page2offset (mfn_list[lp++]) | INTERMEDIATE_OR;
-      pg += lx[l] * POINTERS_PER_PAGE;
-      if (lxs[l])
-	pr = 1;
+      pfn_s = mappings[m].lvls[NUMBER_OF_LEVELS - 1].pfn_start;
+      pfn_e = mappings[m].area.n_pt_pages + pfn_s;
+      if (pfn >= pfn_s && pfn < pfn_e)
+	return 5;
     }
+  return 7;
+}
+
+static void
+generate_page_table (grub_xen_mfn_t *mfn_list)
+{
+  int l, m1, m2;
+  long p, p_s, p_e;
+  grub_uint64_t start, end, pfn;
+  grub_uint64_t *pg;
+  struct grub_xen_mapping_lvl *lvl;
 
-  if (lxs[0] || pr)
-    pg[0] = page2offset (mfn_list[total_pages]) | 5;
-  if (pr)
-    pg += POINTERS_PER_PAGE;
+  for (m1 = 0; m1 < n_mappings; m1++)
+    grub_memset (mappings[m1].where, 0,
+		 mappings[m1].area.n_pt_pages * PAGE_SIZE);
 
-  for (j = 0; j < paging_end; j++)
+  for (l = NUMBER_OF_LEVELS - 1; l >= 0; l--)
     {
-      if (j >= paging_start && j < lp)
-	pg[j + lxs[0]] = page2offset (mfn_list[j]) | 5;
-      else
-	pg[j + lxs[0]] = page2offset (mfn_list[j]) | 7;
+      for (m1 = 0; m1 < n_mappings; m1++)
+	{
+	  start = mappings[m1].lvls[l].virt_start;
+	  end = mappings[m1].lvls[l].virt_end;
+	  pg = get_pg_table_virt(m1, l);
+	  for (m2 = 0; m2 < n_mappings; m2++)
+	    {
+	      lvl = (l > 0) ? mappings[m2].lvls + l - 1 : &mappings[m2].area;
+	      if (l > 0 && lvl->n_pt_pages == 0)
+		continue;
+	      if (lvl->virt_start >= end || lvl->virt_end <= start)
+		continue;
+	      p_s = (grub_max (start, lvl->virt_start) - start) >>
+		    (PAGE_SHIFT + l * LOG_POINTERS_PER_PAGE);
+	      p_e = (grub_min (end, lvl->virt_end) - start) >>
+		    (PAGE_SHIFT + l * LOG_POINTERS_PER_PAGE);
+	      pfn = ((grub_max (start, lvl->virt_start) - lvl->virt_start) >>
+		     (PAGE_SHIFT + l * LOG_POINTERS_PER_PAGE)) + lvl->pfn_start;
+	      grub_dprintf ("xen", "write page table entries level %d pg %p "
+			    "mapping %d/%d index %lx-%lx pfn %llx\n",
+			    l, pg, m1, m2, p_s, p_e, (unsigned long long) pfn);
+	      for (p = p_s; p <= p_e; p++)
+		{
+		  pg[p] = page2offset (mfn_list[pfn]) |
+			  get_pg_table_prot (l, pfn);
+		  pfn++;
+		}
+	    }
+	}
     }
 }
 
@@ -269,39 +355,62 @@ grub_xen_pt_alloc (void)
   grub_relocator_chunk_t ch;
   grub_err_t err;
   grub_uint64_t nr_info_pages;
-  grub_uint64_t nr_pages, nr_pt_pages, nr_need_pages;
+  grub_uint64_t nr_need_pages;
+  grub_uint64_t try_virt_end;
+  struct grub_xen_mapping *map;
 
-  next_start.pt_base = max_addr + xen_inf.virt_base;
-  state.paging_start = max_addr >> PAGE_SHIFT;
+  map = mappings + n_mappings;
+  map_reloc = map + 1;
 
+  next_start.pt_base = max_addr + xen_inf.virt_base;
   nr_info_pages = max_addr >> PAGE_SHIFT;
-  nr_pages = nr_info_pages;
+  nr_need_pages = nr_info_pages;
 
   while (1)
     {
-      nr_pages = ALIGN_UP (nr_pages, (ALIGN_SIZE >> PAGE_SHIFT));
-      nr_pt_pages = get_pgtable_size (nr_pages, xen_inf.virt_base);
-      nr_need_pages =
-	nr_info_pages + nr_pt_pages +
-	((ADDITIONAL_SIZE + STACK_SIZE) >> PAGE_SHIFT);
-      if (nr_pages >= nr_need_pages)
+      try_virt_end = ALIGN_UP (xen_inf.virt_base + page2offset (nr_need_pages) +
+			       ADDITIONAL_SIZE + STACK_SIZE, ALIGN_SIZE);
+      if (!xen_inf.virt_base)
+	try_virt_end += PAGE_SIZE;
+
+      err = get_pgtable_size (xen_inf.virt_base, try_virt_end, nr_info_pages);
+      if (err)
+	return err;
+      n_mappings++;
+
+      /* Map the relocator page either at virtual 0 or after end of area. */
+      nr_need_pages = nr_info_pages + map->area.n_pt_pages;
+      if (xen_inf.virt_base)
+	err = get_pgtable_size (0, PAGE_SIZE, nr_need_pages);
+      else
+	err = get_pgtable_size (try_virt_end - PAGE_SIZE, try_virt_end,
+				nr_need_pages);
+      if (err)
+	return err;
+      nr_need_pages += map_reloc->area.n_pt_pages;
+
+      if (xen_inf.virt_base + page2offset (nr_need_pages) <= try_virt_end)
 	break;
-      nr_pages = nr_need_pages;
+
+      n_mappings--;
     }
 
-  err = grub_relocator_alloc_chunk_addr (relocator, &ch,
-					 max_addr, page2offset (nr_pt_pages));
+  n_mappings++;
+  nr_need_pages = map->area.n_pt_pages + map_reloc->area.n_pt_pages;
+  err = grub_relocator_alloc_chunk_addr (relocator, &ch, max_addr,
+					 page2offset (nr_need_pages));
   if (err)
     return err;
 
-  virt_pgtable = get_virtual_current_address (ch);
-  pgtbl_start = max_addr >> PAGE_SHIFT;
-  max_addr += page2offset (nr_pt_pages);
+  map->where = get_virtual_current_address (ch);
+  map->area.pfn_start = 0;
+  max_addr += page2offset (nr_need_pages);
   state.stack = max_addr + STACK_SIZE + xen_inf.virt_base;
-  state.paging_size = nr_pt_pages;
-  next_start.nr_pt_frames = nr_pt_pages;
-  max_addr = page2offset (nr_pages);
-  pgtbl_end = nr_pages;
+  next_start.nr_pt_frames = nr_need_pages;
+  max_addr = try_virt_end - xen_inf.virt_base;
+  pgtbl_end = max_addr >> PAGE_SHIFT;
+  map_reloc->where = (grub_uint64_t *) ((char *) map->where +
+					page2offset (map->area.n_pt_pages));
 
   return GRUB_ERR_NONE;
 }
@@ -354,8 +463,8 @@ grub_xen_boot (void)
 		(unsigned long long) xen_inf.virt_base,
 		(unsigned long long) page2offset (nr_pages));
 
-  generate_page_table (virt_pgtable, pgtbl_start, pgtbl_end, nr_pages,
-		       xen_inf.virt_base, virt_mfn_list);
+  map_reloc->area.pfn_start = nr_pages;
+  generate_page_table (virt_mfn_list);
 
   state.entry_point = xen_inf.entry_point;
 
diff --git a/include/grub/xen/relocator.h b/include/grub/xen/relocator.h
index ae45dce..35a0ad9 100644
--- a/include/grub/xen/relocator.h
+++ b/include/grub/xen/relocator.h
@@ -23,11 +23,13 @@
 #include <grub/err.h>
 #include <grub/relocator.h>
 
+#define XEN_MAX_MAPPINGS 3
+
 struct grub_relocator_xen_state
 {
   grub_addr_t start_info;
-  grub_addr_t paging_start;
-  grub_addr_t paging_size;
+  grub_addr_t paging_start[XEN_MAX_MAPPINGS];
+  grub_addr_t paging_size[XEN_MAX_MAPPINGS];
   grub_addr_t mfn_list;
   grub_addr_t stack;
   grub_addr_t entry_point;
-- 
2.1.4

[PATCH 6/6] xen: add capability to load p2m list outside of kernel mapping

[Juergen Gross]

Modern pvops linux kernels support a p2m list not covered by the
kernel mapping. This capability is flagged by an elf-note specifying
the virtual address the kernel is expecting the p2m list to be mapped
to.

In case the elf-note is set by the kernel don't place the p2m list
into the kernel mapping, but map it to the given address. This will
allow to support domains with larger memory, as the kernel mapping is
limited to 2GB and a domain with huge memory in the TB range will have
a p2m list larger than this.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
 grub-core/loader/i386/xen.c        | 50 ++++++++++++++++++++++++++++++++------
 grub-core/loader/i386/xen_fileXX.c |  4 +++
 include/grub/xen_file.h            |  2 ++
 3 files changed, 48 insertions(+), 8 deletions(-)

diff --git a/grub-core/loader/i386/xen.c b/grub-core/loader/i386/xen.c
index 5e10420..9ddc6c2 100644
--- a/grub-core/loader/i386/xen.c
+++ b/grub-core/loader/i386/xen.c
@@ -305,19 +305,44 @@ static grub_err_t
 grub_xen_p2m_alloc (void)
 {
   grub_relocator_chunk_t ch;
-  grub_size_t p2msize;
+  grub_size_t p2msize, p2malloc;
   grub_err_t err;
+  struct grub_xen_mapping *map;
+
+  map = mappings + n_mappings;
+  p2msize = ALIGN_UP (sizeof (grub_xen_mfn_t) *
+		      grub_xen_start_page_addr->nr_pages, PAGE_SIZE);
+  if (xen_inf.has_p2m_base)
+    {
+      err = get_pgtable_size (xen_inf.p2m_base, xen_inf.p2m_base + p2msize,
+			      (max_addr + p2msize) >> PAGE_SHIFT);
+      if (err)
+	return err;
+
+      map->area.pfn_start = max_addr >> PAGE_SHIFT;
+      p2malloc = p2msize + page2offset (map->area.n_pt_pages);
+      n_mappings++;
+      next_start.mfn_list = xen_inf.p2m_base;
+      next_start.first_p2m_pfn = map->area.pfn_start;
+      next_start.nr_p2m_frames = p2malloc >> PAGE_SHIFT;
+    }
+  else
+    {
+      next_start.mfn_list = max_addr + xen_inf.virt_base;
+      p2malloc = p2msize;
+    }
 
   state.mfn_list = max_addr;
-  next_start.mfn_list = max_addr + xen_inf.virt_base;
-  p2msize = sizeof (grub_xen_mfn_t) * grub_xen_start_page_addr->nr_pages;
-  err = grub_relocator_alloc_chunk_addr (relocator, &ch, max_addr, p2msize);
+  err = grub_relocator_alloc_chunk_addr (relocator, &ch, max_addr, p2malloc);
   if (err)
     return err;
   virt_mfn_list = get_virtual_current_address (ch);
+  if (xen_inf.has_p2m_base)
+    map->where = (grub_uint64_t *) virt_mfn_list +
+		 p2msize / sizeof (grub_uint64_t);
   grub_memcpy (virt_mfn_list,
 	       (void *) grub_xen_start_page_addr->mfn_list, p2msize);
-  max_addr = ALIGN_UP (max_addr + p2msize, PAGE_SIZE);
+  max_addr += p2malloc;
 
   return GRUB_ERR_NONE;
 }
@@ -425,9 +450,12 @@ grub_xen_alloc_end (void)
     return GRUB_ERR_NONE;
   called = 1;
 
-  err = grub_xen_p2m_alloc ();
-  if (err)
-    return err;
+  if (!xen_inf.has_p2m_base)
+    {
+      err = grub_xen_p2m_alloc ();
+      if (err)
+	return err;
+    }
   err = grub_xen_special_alloc ();
   if (err)
     return err;
@@ -452,6 +480,12 @@ grub_xen_boot (void)
   err = grub_xen_alloc_end ();
   if (err)
     return err;
+  if (xen_inf.has_p2m_base)
+    {
+      err = grub_xen_p2m_alloc ();
+      if (err)
+	return err;
+    }
 
   err = set_mfns (console_pfn);
   if (err)
diff --git a/grub-core/loader/i386/xen_fileXX.c b/grub-core/loader/i386/xen_fileXX.c
index 69fccd2..8d01adb 100644
--- a/grub-core/loader/i386/xen_fileXX.c
+++ b/grub-core/loader/i386/xen_fileXX.c
@@ -253,6 +253,10 @@ parse_note (grub_elf_t elf, struct grub_xen_file_info *xi,
 					  descsz == 2 ? 2 : 3) == 0)
 	    xi->arch = GRUB_XEN_FILE_I386;
 	  break;
+	case 15:
+	  xi->p2m_base = grub_le_to_cpu_addr (*(Elf_Addr *) desc);
+	  xi->has_p2m_base = 1;
+	  break;
 	case 16:
 	  xi->unmapped_initrd = !!grub_le_to_cpu32(*(grub_uint32_t *) desc);
 	  break;
diff --git a/include/grub/xen_file.h b/include/grub/xen_file.h
index ed749fa..6587999 100644
--- a/include/grub/xen_file.h
+++ b/include/grub/xen_file.h
@@ -32,9 +32,11 @@ struct grub_xen_file_info
   grub_uint64_t entry_point;
   grub_uint64_t hypercall_page;
   grub_uint64_t paddr_offset;
+  grub_uint64_t p2m_base;
   int has_hypercall_page;
   int has_note;
   int has_xen_guest;
+  int has_p2m_base;
   int extended_cr3;
   int unmapped_initrd;
   enum
-- 
2.1.4

Re: [PATCH 0/6] grub-xen: support booting huge pv-domains

[Juergen Gross]

Ping?

On 11/02/2015 06:51 AM, Juergen Gross wrote:
> The Xen hypervisor supports starting a dom0 with large memory (up to
> the TB range) by not including the initrd and p2m list in the initial
> kernel mapping. Especially the p2m list can grow larger than the
> available virtual space in the initial mapping.
>
> The started kernel is indicating the support of each feature via
> elf notes.
>
> This series enables grub-xen to do the same as the hypervisor.
>
> Tested with:
> - 32 bit domU (kernel not supporting unmapped initrd)
> - 32 bit domU (kernel supporting unmapped initrd)
> - 1 GB 64 bit domU (kernel supporting unmapped initrd, not p2m)
> - 1 GB 64 bit domU (kernel supporting unmapped initrd and p2m)
> - 900GB 64 bit domU (kernel supporting unmapped initrd and p2m)
>
>
> Juergen Gross (6):
>    xen: factor out p2m list allocation into separate function
>    xen: factor out allocation of special pages into separate function
>    xen: factor out allocation of page tables into separate function
>    xen: add capability to load initrd outside of initial mapping
>    xen: modify page table construction
>    xen: add capability to load p2m list outside of kernel mapping
>
>   grub-core/lib/i386/xen/relocator.S   |  47 ++--
>   grub-core/lib/x86_64/xen/relocator.S |  41 ++-
>   grub-core/lib/xen/relocator.c        |  22 +-
>   grub-core/loader/i386/xen.c          | 521 +++++++++++++++++++++++++----------
>   grub-core/loader/i386/xen_fileXX.c   |   7 +
>   include/grub/xen/relocator.h         |   6 +-
>   include/grub/xen_file.h              |   3 +
>   7 files changed, 446 insertions(+), 201 deletions(-)
>

Re: [PATCH 0/6] grub-xen: support booting huge pv-domains

[Juergen Gross]

Ping?

On 11/02/2015 06:51 AM, Juergen Gross wrote:
> The Xen hypervisor supports starting a dom0 with large memory (up to
> the TB range) by not including the initrd and p2m list in the initial
> kernel mapping. Especially the p2m list can grow larger than the
> available virtual space in the initial mapping.
>
> The started kernel is indicating the support of each feature via
> elf notes.
>
> This series enables grub-xen to do the same as the hypervisor.
>
> Tested with:
> - 32 bit domU (kernel not supporting unmapped initrd)
> - 32 bit domU (kernel supporting unmapped initrd)
> - 1 GB 64 bit domU (kernel supporting unmapped initrd, not p2m)
> - 1 GB 64 bit domU (kernel supporting unmapped initrd and p2m)
> - 900GB 64 bit domU (kernel supporting unmapped initrd and p2m)
>
>
> Juergen Gross (6):
>    xen: factor out p2m list allocation into separate function
>    xen: factor out allocation of special pages into separate function
>    xen: factor out allocation of page tables into separate function
>    xen: add capability to load initrd outside of initial mapping
>    xen: modify page table construction
>    xen: add capability to load p2m list outside of kernel mapping
>
>   grub-core/lib/i386/xen/relocator.S   |  47 ++--
>   grub-core/lib/x86_64/xen/relocator.S |  41 ++-
>   grub-core/lib/xen/relocator.c        |  22 +-
>   grub-core/loader/i386/xen.c          | 521 +++++++++++++++++++++++++----------
>   grub-core/loader/i386/xen_fileXX.c   |   7 +
>   include/grub/xen/relocator.h         |   6 +-
>   include/grub/xen_file.h              |   3 +
>   7 files changed, 446 insertions(+), 201 deletions(-)
>

Re: [PATCH 0/6] grub-xen: support booting huge pv-domains

[Juergen Gross]

On 02/11/15 06:51, Juergen Gross wrote:
> The Xen hypervisor supports starting a dom0 with large memory (up to
> the TB range) by not including the initrd and p2m list in the initial
> kernel mapping. Especially the p2m list can grow larger than the
> available virtual space in the initial mapping.
> 
> The started kernel is indicating the support of each feature via
> elf notes.
> 
> This series enables grub-xen to do the same as the hypervisor.
> 
> Tested with:
> - 32 bit domU (kernel not supporting unmapped initrd)
> - 32 bit domU (kernel supporting unmapped initrd)
> - 1 GB 64 bit domU (kernel supporting unmapped initrd, not p2m)
> - 1 GB 64 bit domU (kernel supporting unmapped initrd and p2m)
> - 900GB 64 bit domU (kernel supporting unmapped initrd and p2m)
> 
> 
> Juergen Gross (6):
>   xen: factor out p2m list allocation into separate function
>   xen: factor out allocation of special pages into separate function
>   xen: factor out allocation of page tables into separate function
>   xen: add capability to load initrd outside of initial mapping
>   xen: modify page table construction
>   xen: add capability to load p2m list outside of kernel mapping
> 
>  grub-core/lib/i386/xen/relocator.S   |  47 ++--
>  grub-core/lib/x86_64/xen/relocator.S |  41 ++-
>  grub-core/lib/xen/relocator.c        |  22 +-
>  grub-core/loader/i386/xen.c          | 521 +++++++++++++++++++++++++----------
>  grub-core/loader/i386/xen_fileXX.c   |   7 +
>  include/grub/xen/relocator.h         |   6 +-
>  include/grub/xen_file.h              |   3 +
>  7 files changed, 446 insertions(+), 201 deletions(-)
> 

I'd really appreciate some kind of reaction.

Is the general approach acceptable?


Juergen

Re: [PATCH 0/6] grub-xen: support booting huge pv-domains

[Vladimir 'phcoder' Serbinenko]

[-- Attachment #1: Type: text/plain, Size: 2051 bytes --]

Sorry for delay. Just this patch series is more difficult to review for me
but I'm definitely not ignoring it. I'll try to get to it this week
Le 16 nov. 2015 6:47 AM, "Juergen Gross" <jgross@suse.com> a écrit :

> On 02/11/15 06:51, Juergen Gross wrote:
> > The Xen hypervisor supports starting a dom0 with large memory (up to
> > the TB range) by not including the initrd and p2m list in the initial
> > kernel mapping. Especially the p2m list can grow larger than the
> > available virtual space in the initial mapping.
> >
> > The started kernel is indicating the support of each feature via
> > elf notes.
> >
> > This series enables grub-xen to do the same as the hypervisor.
> >
> > Tested with:
> > - 32 bit domU (kernel not supporting unmapped initrd)
> > - 32 bit domU (kernel supporting unmapped initrd)
> > - 1 GB 64 bit domU (kernel supporting unmapped initrd, not p2m)
> > - 1 GB 64 bit domU (kernel supporting unmapped initrd and p2m)
> > - 900GB 64 bit domU (kernel supporting unmapped initrd and p2m)
> >
> >
> > Juergen Gross (6):
> >   xen: factor out p2m list allocation into separate function
> >   xen: factor out allocation of special pages into separate function
> >   xen: factor out allocation of page tables into separate function
> >   xen: add capability to load initrd outside of initial mapping
> >   xen: modify page table construction
> >   xen: add capability to load p2m list outside of kernel mapping
> >
> >  grub-core/lib/i386/xen/relocator.S   |  47 ++--
> >  grub-core/lib/x86_64/xen/relocator.S |  41 ++-
> >  grub-core/lib/xen/relocator.c        |  22 +-
> >  grub-core/loader/i386/xen.c          | 521
> +++++++++++++++++++++++++----------
> >  grub-core/loader/i386/xen_fileXX.c   |   7 +
> >  include/grub/xen/relocator.h         |   6 +-
> >  include/grub/xen_file.h              |   3 +
> >  7 files changed, 446 insertions(+), 201 deletions(-)
> >
>
> I'd really appreciate some kind of reaction.
>
> Is the general approach acceptable?
>
>
> Juergen
>

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Re: [PATCH 0/6] grub-xen: support booting huge pv-domains

[Vladimir 'phcoder' Serbinenko]

[-- Attachment #1.1: Type: text/plain, Size: 2051 bytes --]

Sorry for delay. Just this patch series is more difficult to review for me
but I'm definitely not ignoring it. I'll try to get to it this week
Le 16 nov. 2015 6:47 AM, "Juergen Gross" <jgross@suse.com> a écrit :

> On 02/11/15 06:51, Juergen Gross wrote:
> > The Xen hypervisor supports starting a dom0 with large memory (up to
> > the TB range) by not including the initrd and p2m list in the initial
> > kernel mapping. Especially the p2m list can grow larger than the
> > available virtual space in the initial mapping.
> >
> > The started kernel is indicating the support of each feature via
> > elf notes.
> >
> > This series enables grub-xen to do the same as the hypervisor.
> >
> > Tested with:
> > - 32 bit domU (kernel not supporting unmapped initrd)
> > - 32 bit domU (kernel supporting unmapped initrd)
> > - 1 GB 64 bit domU (kernel supporting unmapped initrd, not p2m)
> > - 1 GB 64 bit domU (kernel supporting unmapped initrd and p2m)
> > - 900GB 64 bit domU (kernel supporting unmapped initrd and p2m)
> >
> >
> > Juergen Gross (6):
> >   xen: factor out p2m list allocation into separate function
> >   xen: factor out allocation of special pages into separate function
> >   xen: factor out allocation of page tables into separate function
> >   xen: add capability to load initrd outside of initial mapping
> >   xen: modify page table construction
> >   xen: add capability to load p2m list outside of kernel mapping
> >
> >  grub-core/lib/i386/xen/relocator.S   |  47 ++--
> >  grub-core/lib/x86_64/xen/relocator.S |  41 ++-
> >  grub-core/lib/xen/relocator.c        |  22 +-
> >  grub-core/loader/i386/xen.c          | 521
> +++++++++++++++++++++++++----------
> >  grub-core/loader/i386/xen_fileXX.c   |   7 +
> >  include/grub/xen/relocator.h         |   6 +-
> >  include/grub/xen_file.h              |   3 +
> >  7 files changed, 446 insertions(+), 201 deletions(-)
> >
>
> I'd really appreciate some kind of reaction.
>
> Is the general approach acceptable?
>
>
> Juergen
>

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Re: [PATCH 0/6] grub-xen: support booting huge pv-domains

[Juergen Gross]

On 16/11/15 08:08, Vladimir 'phcoder' Serbinenko wrote:
> Sorry for delay. Just this patch series is more difficult to review for
> me but I'm definitely not ignoring it. I'll try to get to it this week

Thanks for the reply. I just wanted to be sure the patches aren't
bitrotting in some spam folder.


Juergen

> 
> Le 16 nov. 2015 6:47 AM, "Juergen Gross" <jgross@suse.com
> <mailto:jgross@suse.com>> a écrit :
> 
>     On 02/11/15 06:51, Juergen Gross wrote:
>     > The Xen hypervisor supports starting a dom0 with large memory (up to
>     > the TB range) by not including the initrd and p2m list in the initial
>     > kernel mapping. Especially the p2m list can grow larger than the
>     > available virtual space in the initial mapping.
>     >
>     > The started kernel is indicating the support of each feature via
>     > elf notes.
>     >
>     > This series enables grub-xen to do the same as the hypervisor.
>     >
>     > Tested with:
>     > - 32 bit domU (kernel not supporting unmapped initrd)
>     > - 32 bit domU (kernel supporting unmapped initrd)
>     > - 1 GB 64 bit domU (kernel supporting unmapped initrd, not p2m)
>     > - 1 GB 64 bit domU (kernel supporting unmapped initrd and p2m)
>     > - 900GB 64 bit domU (kernel supporting unmapped initrd and p2m)
>     >
>     >
>     > Juergen Gross (6):
>     >   xen: factor out p2m list allocation into separate function
>     >   xen: factor out allocation of special pages into separate function
>     >   xen: factor out allocation of page tables into separate function
>     >   xen: add capability to load initrd outside of initial mapping
>     >   xen: modify page table construction
>     >   xen: add capability to load p2m list outside of kernel mapping
>     >
>     >  grub-core/lib/i386/xen/relocator.S   |  47 ++--
>     >  grub-core/lib/x86_64/xen/relocator.S |  41 ++-
>     >  grub-core/lib/xen/relocator.c        |  22 +-
>     >  grub-core/loader/i386/xen.c          | 521
>     +++++++++++++++++++++++++----------
>     >  grub-core/loader/i386/xen_fileXX.c   |   7 +
>     >  include/grub/xen/relocator.h         |   6 +-
>     >  include/grub/xen_file.h              |   3 +
>     >  7 files changed, 446 insertions(+), 201 deletions(-)
>     >
> 
>     I'd really appreciate some kind of reaction.
> 
>     Is the general approach acceptable?
> 
> 
>     Juergen
> 

Re: [PATCH 0/6] grub-xen: support booting huge pv-domains

[Juergen Gross]

On 16/11/15 08:08, Vladimir 'phcoder' Serbinenko wrote:
> Sorry for delay. Just this patch series is more difficult to review for
> me but I'm definitely not ignoring it. I'll try to get to it this week

Thanks for the reply. I just wanted to be sure the patches aren't
bitrotting in some spam folder.


Juergen

> 
> Le 16 nov. 2015 6:47 AM, "Juergen Gross" <jgross@suse.com
> <mailto:jgross@suse.com>> a écrit :
> 
>     On 02/11/15 06:51, Juergen Gross wrote:
>     > The Xen hypervisor supports starting a dom0 with large memory (up to
>     > the TB range) by not including the initrd and p2m list in the initial
>     > kernel mapping. Especially the p2m list can grow larger than the
>     > available virtual space in the initial mapping.
>     >
>     > The started kernel is indicating the support of each feature via
>     > elf notes.
>     >
>     > This series enables grub-xen to do the same as the hypervisor.
>     >
>     > Tested with:
>     > - 32 bit domU (kernel not supporting unmapped initrd)
>     > - 32 bit domU (kernel supporting unmapped initrd)
>     > - 1 GB 64 bit domU (kernel supporting unmapped initrd, not p2m)
>     > - 1 GB 64 bit domU (kernel supporting unmapped initrd and p2m)
>     > - 900GB 64 bit domU (kernel supporting unmapped initrd and p2m)
>     >
>     >
>     > Juergen Gross (6):
>     >   xen: factor out p2m list allocation into separate function
>     >   xen: factor out allocation of special pages into separate function
>     >   xen: factor out allocation of page tables into separate function
>     >   xen: add capability to load initrd outside of initial mapping
>     >   xen: modify page table construction
>     >   xen: add capability to load p2m list outside of kernel mapping
>     >
>     >  grub-core/lib/i386/xen/relocator.S   |  47 ++--
>     >  grub-core/lib/x86_64/xen/relocator.S |  41 ++-
>     >  grub-core/lib/xen/relocator.c        |  22 +-
>     >  grub-core/loader/i386/xen.c          | 521
>     +++++++++++++++++++++++++----------
>     >  grub-core/loader/i386/xen_fileXX.c   |   7 +
>     >  include/grub/xen/relocator.h         |   6 +-
>     >  include/grub/xen_file.h              |   3 +
>     >  7 files changed, 446 insertions(+), 201 deletions(-)
>     >
> 
>     I'd really appreciate some kind of reaction.
> 
>     Is the general approach acceptable?
> 
> 
>     Juergen
> 


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Re: [PATCH 0/6] grub-xen: support booting huge pv-domains

[Juergen Gross]

On 02/11/15 06:51, Juergen Gross wrote:
> The Xen hypervisor supports starting a dom0 with large memory (up to
> the TB range) by not including the initrd and p2m list in the initial
> kernel mapping. Especially the p2m list can grow larger than the
> available virtual space in the initial mapping.
> 
> The started kernel is indicating the support of each feature via
> elf notes.
> 
> This series enables grub-xen to do the same as the hypervisor.
> 
> Tested with:
> - 32 bit domU (kernel not supporting unmapped initrd)
> - 32 bit domU (kernel supporting unmapped initrd)
> - 1 GB 64 bit domU (kernel supporting unmapped initrd, not p2m)
> - 1 GB 64 bit domU (kernel supporting unmapped initrd and p2m)
> - 900GB 64 bit domU (kernel supporting unmapped initrd and p2m)
> 
> 
> Juergen Gross (6):
>   xen: factor out p2m list allocation into separate function
>   xen: factor out allocation of special pages into separate function
>   xen: factor out allocation of page tables into separate function
>   xen: add capability to load initrd outside of initial mapping
>   xen: modify page table construction
>   xen: add capability to load p2m list outside of kernel mapping
> 
>  grub-core/lib/i386/xen/relocator.S   |  47 ++--
>  grub-core/lib/x86_64/xen/relocator.S |  41 ++-
>  grub-core/lib/xen/relocator.c        |  22 +-
>  grub-core/loader/i386/xen.c          | 521 +++++++++++++++++++++++++----------
>  grub-core/loader/i386/xen_fileXX.c   |   7 +
>  include/grub/xen/relocator.h         |   6 +-
>  include/grub/xen_file.h              |   3 +
>  7 files changed, 446 insertions(+), 201 deletions(-)

Can I help in some way to get this patchset into grub2?


Juergen

Re: [PATCH 0/6] grub-xen: support booting huge pv-domains

[Juergen Gross]

On 02/11/15 06:51, Juergen Gross wrote:
> The Xen hypervisor supports starting a dom0 with large memory (up to
> the TB range) by not including the initrd and p2m list in the initial
> kernel mapping. Especially the p2m list can grow larger than the
> available virtual space in the initial mapping.
> 
> The started kernel is indicating the support of each feature via
> elf notes.
> 
> This series enables grub-xen to do the same as the hypervisor.
> 
> Tested with:
> - 32 bit domU (kernel not supporting unmapped initrd)
> - 32 bit domU (kernel supporting unmapped initrd)
> - 1 GB 64 bit domU (kernel supporting unmapped initrd, not p2m)
> - 1 GB 64 bit domU (kernel supporting unmapped initrd and p2m)
> - 900GB 64 bit domU (kernel supporting unmapped initrd and p2m)
> 
> 
> Juergen Gross (6):
>   xen: factor out p2m list allocation into separate function
>   xen: factor out allocation of special pages into separate function
>   xen: factor out allocation of page tables into separate function
>   xen: add capability to load initrd outside of initial mapping
>   xen: modify page table construction
>   xen: add capability to load p2m list outside of kernel mapping
> 
>  grub-core/lib/i386/xen/relocator.S   |  47 ++--
>  grub-core/lib/x86_64/xen/relocator.S |  41 ++-
>  grub-core/lib/xen/relocator.c        |  22 +-
>  grub-core/loader/i386/xen.c          | 521 +++++++++++++++++++++++++----------
>  grub-core/loader/i386/xen_fileXX.c   |   7 +
>  include/grub/xen/relocator.h         |   6 +-
>  include/grub/xen_file.h              |   3 +
>  7 files changed, 446 insertions(+), 201 deletions(-)

Can I help in some way to get this patchset into grub2?


Juergen