[PATCH 35/58] KVM: MMU: Pass the guest pde to set_pte_common

Avi Kivity
2007-06-17T09:44:16Z

We will need the accessed bit (in addition to the dirty bit) and
also write access (for setting the dirty bit) in a future patch.

Signed-off-by: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
---
drivers/kvm/paging_tmpl.h | 29 +++++++++++++++--------------
1 files changed, 15 insertions(+), 14 deletions(-)

diff --git a/drivers/kvm/paging_tmpl.h b/drivers/kvm/paging_tmpl.h
index 6576300..7e998d1 100644
--- a/drivers/kvm/paging_tmpl.h
+++ b/drivers/kvm/paging_tmpl.h
@@ -195,11 +195,12 @@ static void FNAME(mark_pagetable_dirty)(struct kvm *kvm,
static void FNAME(set_pte_common)(struct kvm_vcpu *vcpu,
u64 *shadow_pte,
gpa_t gaddr,
- int dirty,
+ pt_element_t *gpte,
u64 access_bits,
gfn_t gfn)
{
hpa_t paddr;
+ int dirty = *gpte & PT_DIRTY_MASK;

*shadow_pte |= access_bits << PT_SHADOW_BITS_OFFSET;
if (!dirty)
@@ -240,14 +241,14 @@ static void FNAME(set_pte_common)(struct kvm_vcpu *vcpu,
rmap_add(vcpu, shadow_pte);
}

-static void FNAME(set_pte)(struct kvm_vcpu *vcpu, u64 guest_pte,
+static void FNAME(set_pte)(struct kvm_vcpu *vcpu, pt_element_t *gpte,
u64 *shadow_pte, u64 access_bits, gfn_t gfn)
{
ASSERT(*shadow_pte == 0);
- access_bits &= guest_pte;
- *shadow_pte = (guest_pte & PT_PTE_COPY_MASK);
- FNAME(set_pte_common)(vcpu, shadow_pte, guest_pte & PT_BASE_ADDR_MASK,
- guest_pte & PT_DIRTY_MASK, access_bits, gfn);
+ access_bits &= *gpte;
+ *shadow_pte = (*gpte & PT_PTE_COPY_MASK);
+ FNAME(set_pte_common)(vcpu, shadow_pte, *gpte & PT_BASE_ADDR_MASK,
+ gpte, access_bits, gfn);
}

static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *page,
@@ -261,24 +262,24 @@ static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *page,
if (~gpte & (PT_PRESENT_MASK | PT_ACCESSED_MASK))
return;
pgprintk("%s: gpte %llx spte %p\n", __FUNCTION__, (u64)gpte, spte);
- FNAME(set_pte)(vcpu, gpte, spte, PT_USER_MASK | PT_WRITABLE_MASK,
+ FNAME(set_pte)(vcpu, &gpte, spte, PT_USER_MASK | PT_WRITABLE_MASK,
(gpte & PT_BASE_ADDR_MASK) >> PAGE_SHIFT);
}

-static void FNAME(set_pde)(struct kvm_vcpu *vcpu, u64 guest_pde,
+static void FNAME(set_pde)(struct kvm_vcpu *vcpu, pt_element_t *gpde,
u64 *shadow_pte, u64 access_bits, gfn_t gfn)
{
gpa_t gaddr;

ASSERT(*shadow_pte == 0);
- access_bits &= guest_pde;
+ access_bits &= *gpde;
gaddr = (gpa_t)gfn << PAGE_SHIFT;
if (PTTYPE == 32 && is_cpuid_PSE36())
- gaddr |= (guest_pde & PT32_DIR_PSE36_MASK) <<
+ gaddr |= (*gpde & PT32_DIR_PSE36_MASK) <<
(32 - PT32_DIR_PSE36_SHIFT);
- *shadow_pte = guest_pde & PT_PTE_COPY_MASK;
+ *shadow_pte = *gpde & PT_PTE_COPY_MASK;
FNAME(set_pte_common)(vcpu, shadow_pte, gaddr,
- guest_pde & PT_DIRTY_MASK, access_bits, gfn);
+ gpde, access_bits, gfn);
}

/*
@@ -349,11 +350,11 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
if (walker->level == PT_DIRECTORY_LEVEL) {
if (prev_shadow_ent)
*prev_shadow_ent |= PT_SHADOW_PS_MARK;
- FNAME(set_pde)(vcpu, *guest_ent, shadow_ent,
+ FNAME(set_pde)(vcpu, guest_ent, shadow_ent,
walker->inherited_ar, walker->gfn);
} else {
ASSERT(walker->level == PT_PAGE_TABLE_LEVEL);
- FNAME(set_pte)(vcpu, *guest_ent, shadow_ent,
+ FNAME(set_pte)(vcpu, guest_ent, shadow_ent,
walker->inherited_ar,
walker->gfn);