KVM: SVM: Limit PFERR_NESTED_GUEST_PAGE error_code check to L1 guest

Commit 147277540bbc ("kvm: svm: Add support for additional SVM NPF error
codes", 2016-11-23) added a new error code to aid nested page fault
handling.  The commit unprotects (kvm_mmu_unprotect_page) the page when
we get a NPF due to guest page table walk where the page was marked RO.

However, if an L0->L2 shadow nested page table can also be marked read-only
when a page is read only in L1's nested page table.  If such a page
is accessed by L2 while walking page tables it can cause a nested
page fault (page table walks are write accesses).  However, after
kvm_mmu_unprotect_page we may get another page fault, and again in an
endless stream.

To cover this use case, we qualify the new error_code check with
vcpu->arch.mmu_direct_map so that the error_code check would run on L1
guest, and not the L2 guest.  This avoids hitting the above scenario.

Fixes: 147277540bbc54119172481c8ef6d930cc9fbfc2
Cc: stable@vger.kernel.org
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Thomas Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 2fac6f7..454d81d 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -4840,7 +4840,8 @@ int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t cr2, u64 error_code,
         * Note: AMD only (since it supports the PFERR_GUEST_PAGE_MASK used
         *       in PFERR_NEXT_GUEST_PAGE)
         */
-       if (error_code == PFERR_NESTED_GUEST_PAGE) {
+       if (vcpu->arch.mmu.direct_map &&
+               error_code == PFERR_NESTED_GUEST_PAGE) {
                kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(cr2));
                return 1;
        }