diff options
| -rw-r--r-- | arch/x86/kvm/mmu.c | 9 | ||||
| -rw-r--r-- | arch/x86/kvm/paging_tmpl.h | 5 |
2 files changed, 11 insertions, 3 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 812770c..d2ea9ca 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -2697,6 +2697,9 @@ static void mmu_pte_write_new_pte(struct kvm_vcpu *vcpu, return; } + if (is_rsvd_bits_set(vcpu, *(u64 *)new, PT_PAGE_TABLE_LEVEL)) + return; + ++vcpu->kvm->stat.mmu_pte_updated; if (!sp->role.cr4_pae) paging32_update_pte(vcpu, sp, spte, new); @@ -2775,6 +2778,7 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, bool guest_initiated) { gfn_t gfn = gpa >> PAGE_SHIFT; + union kvm_mmu_page_role mask = { .word = 0 }; struct kvm_mmu_page *sp; struct hlist_node *node; LIST_HEAD(invalid_list); @@ -2849,6 +2853,7 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, } } + mask.cr0_wp = mask.cr4_pae = mask.nxe = 1; for_each_gfn_indirect_valid_sp(vcpu->kvm, sp, gfn, node) { pte_size = sp->role.cr4_pae ? 8 : 4; misaligned = (offset ^ (offset + bytes - 1)) & ~(pte_size - 1); @@ -2896,7 +2901,9 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, while (npte--) { entry = *spte; mmu_pte_write_zap_pte(vcpu, sp, spte); - if (gentry) + if (gentry && + !((sp->role.word ^ vcpu->arch.mmu.base_role.word) + & mask.word)) mmu_pte_write_new_pte(vcpu, sp, spte, &gentry); if (!remote_flush && need_remote_flush(entry, *spte)) remote_flush = true; diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h index d9a2742..51ef909 100644 --- a/arch/x86/kvm/paging_tmpl.h +++ b/arch/x86/kvm/paging_tmpl.h @@ -638,8 +638,9 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp, return -EINVAL; gfn = gpte_to_gfn(gpte); - if (gfn != sp->gfns[i] || - !is_present_gpte(gpte) || !(gpte & PT_ACCESSED_MASK)) { + if (is_rsvd_bits_set(vcpu, gpte, PT_PAGE_TABLE_LEVEL) + || gfn != sp->gfns[i] || !is_present_gpte(gpte) + || !(gpte & PT_ACCESSED_MASK)) { u64 nonpresent; if (is_present_gpte(gpte) || !clear_unsync) |