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KVM: MMU: Introduce kvm_pdptr_read_mmu

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This function is implemented to load the pdptr pointers of
the currently running guest (l1 or l2 guest). Therefore it
takes care about the current paging mode and can read pdptrs
out of l2 guest physical memory.

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 17:30:58 +02:00 committed by Avi Kivity
parent ff03a073e7
commit d41d1895eb
3 changed files with 9 additions and 2 deletions
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7
arch/x86/kvm/kvm_cache_regs.h
View File

@ -45,6 +45,13 @@ static inline u64 kvm_pdptr_read(struct kvm_vcpu *vcpu, int index)
return vcpu->arch.walk_mmu->pdptrs[index];
}
static inline u64 kvm_pdptr_read_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, int index)
{
load_pdptrs(vcpu, mmu, mmu->get_cr3(vcpu));
return mmu->pdptrs[index];
}
static inline ulong kvm_read_cr0_bits(struct kvm_vcpu *vcpu, ulong mask)
{
ulong tmask = mask & KVM_POSSIBLE_CR0_GUEST_BITS;

2
arch/x86/kvm/mmu.c
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@ -2398,7 +2398,7 @@ static int mmu_alloc_roots(struct kvm_vcpu *vcpu)
ASSERT(!VALID_PAGE(root));
if (vcpu->arch.mmu.root_level == PT32E_ROOT_LEVEL) {
pdptr = kvm_pdptr_read(vcpu, i);
pdptr = kvm_pdptr_read_mmu(vcpu, &vcpu->arch.mmu, i);
if (!is_present_gpte(pdptr)) {
vcpu->arch.mmu.pae_root[i] = 0;
continue;

2
arch/x86/kvm/paging_tmpl.h
View File

@ -137,7 +137,7 @@ walk:
#if PTTYPE == 64
if (walker->level == PT32E_ROOT_LEVEL) {
pte = kvm_pdptr_read(vcpu, (addr >> 30) & 3);
pte = kvm_pdptr_read_mmu(vcpu, mmu, (addr >> 30) & 3);
trace_kvm_mmu_paging_element(pte, walker->level);
if (!is_present_gpte(pte)) {
present = false;