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KVM: MMU: Make walk_addr_generic capable for two-level walking

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This patch uses kvm_read_guest_page_tdp to make the
walk_addr_generic functions suitable for two-level page
table walking.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Joerg Roedel 2010-09-10 17:30:52 +02:00 committed by Avi Kivity
parent ec92fe44e7
commit 2329d46d21
1 changed files with 23 additions and 7 deletions
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30
arch/x86/kvm/paging_tmpl.h
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@ -124,6 +124,8 @@ static int FNAME(walk_addr_generic)(struct guest_walker *walker,
unsigned index, pt_access, uninitialized_var(pte_access);
gpa_t pte_gpa;
bool eperm, present, rsvd_fault;
int offset;
u32 access = 0;
trace_kvm_mmu_pagetable_walk(addr, write_fault, user_fault,
fetch_fault);
@ -153,12 +155,14 @@ walk:
index = PT_INDEX(addr, walker->level);
table_gfn = gpte_to_gfn(pte);
pte_gpa = gfn_to_gpa(table_gfn);
pte_gpa += index * sizeof(pt_element_t);
offset = index * sizeof(pt_element_t);
pte_gpa = gfn_to_gpa(table_gfn) + offset;
walker->table_gfn[walker->level - 1] = table_gfn;
walker->pte_gpa[walker->level - 1] = pte_gpa;
if (kvm_read_guest(vcpu->kvm, pte_gpa, &pte, sizeof(pte))) {
if (kvm_read_guest_page_mmu(vcpu, mmu, table_gfn, &pte,
offset, sizeof(pte),
PFERR_USER_MASK|PFERR_WRITE_MASK)) {
present = false;
break;
}
@ -209,15 +213,27 @@ walk:
is_large_pte(pte) &&
mmu->root_level == PT64_ROOT_LEVEL)) {
int lvl = walker->level;
gpa_t real_gpa;
gfn_t gfn;
walker->gfn = gpte_to_gfn_lvl(pte, lvl);
walker->gfn += (addr & PT_LVL_OFFSET_MASK(lvl))
>> PAGE_SHIFT;
gfn = gpte_to_gfn_lvl(pte, lvl);
gfn += (addr & PT_LVL_OFFSET_MASK(lvl)) >> PAGE_SHIFT;
if (PTTYPE == 32 &&
walker->level == PT_DIRECTORY_LEVEL &&
is_cpuid_PSE36())
walker->gfn += pse36_gfn_delta(pte);
gfn += pse36_gfn_delta(pte);
access |= write_fault ? PFERR_WRITE_MASK : 0;
access |= fetch_fault ? PFERR_FETCH_MASK : 0;
access |= user_fault ? PFERR_USER_MASK : 0;
real_gpa = mmu->translate_gpa(vcpu, gfn_to_gpa(gfn),
access);
if (real_gpa == UNMAPPED_GVA)
return 0;
walker->gfn = real_gpa >> PAGE_SHIFT;
break;
}