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kvm: nVMX: Add support for fast unprotection of nested guest page tables 

This is the same as commit 147277540b ("kvm: svm: Add support for
additional SVM NPF error codes", 2016-11-23), but for Intel processors.
In this case, the exit qualification field's bit 8 says whether the
EPT violation occurred while translating the guest's final physical
address or rather while translating the guest page tables.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-11-28 14:39:58 +01:00
parent 64531a3b70
commit eebed24389
3 changed files with 5 additions and 6 deletions
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1
arch/x86/include/asm/kvm_host.h
View File

@ -204,7 +204,6 @@ enum {
#define PFERR_GUEST_PAGE_MASK (1ULL << PFERR_GUEST_PAGE_BIT)
#define PFERR_NESTED_GUEST_PAGE (PFERR_GUEST_PAGE_MASK | \
PFERR_USER_MASK | \
PFERR_WRITE_MASK | \
PFERR_PRESENT_MASK)

5
arch/x86/kvm/mmu.c
View File

@ -4836,12 +4836,9 @@ int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t cr2, u64 error_code,
* This can occur when using nested virtualization with nested
* paging in both guests. If true, we simply unprotect the page
* and resume the guest.
*
* Note: AMD only (since it supports the PFERR_GUEST_PAGE_MASK used
* in PFERR_NEXT_GUEST_PAGE)
*/
if (vcpu->arch.mmu.direct_map &&
error_code == PFERR_NESTED_GUEST_PAGE) {
(error_code & PFERR_NESTED_GUEST_PAGE) == PFERR_NESTED_GUEST_PAGE) {
kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(cr2));
return 1;
}

5
arch/x86/kvm/vmx.c
View File

@ -6358,7 +6358,7 @@ static int handle_ept_violation(struct kvm_vcpu *vcpu)
{
unsigned long exit_qualification;
gpa_t gpa;
u32 error_code;
u64 error_code;
exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
@ -6390,6 +6390,9 @@ static int handle_ept_violation(struct kvm_vcpu *vcpu)
EPT_VIOLATION_EXECUTABLE))
? PFERR_PRESENT_MASK : 0;
error_code |= (exit_qualification & 0x100) != 0 ?
PFERR_GUEST_FINAL_MASK : PFERR_GUEST_PAGE_MASK;
vcpu->arch.gpa_available = true;
vcpu->arch.exit_qualification = exit_qualification;