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| author | Marcelo Tosatti <mtosatti@redhat.com> | 2008-07-10 20:54:29 -0300 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2008-07-20 12:42:40 +0300 |
| commit | 376c53c2b30d4a1955240f59f4ecd959aa118f92 (patch) | |
| tree | a4d7e1f1d26f30ba717d7331ec8e85c0faa4add3 /arch | |
| parent | 34d4cb8fca1f2a31be152b74797e6cd160ec9de6 (diff) | |
| download | op-kernel-dev-376c53c2b30d4a1955240f59f4ecd959aa118f92.zip op-kernel-dev-376c53c2b30d4a1955240f59f4ecd959aa118f92.tar.gz | |
KVM: MMU: improve invalid shadow root page handling
Harden kvm_mmu_zap_page() against invalid root pages that
had been shadowed from memslots that are gone.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/mmu.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index ff7cf63..7f57da6 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -930,14 +930,17 @@ static void kvm_mmu_zap_page(struct kvm *kvm, struct kvm_mmu_page *sp) } kvm_mmu_page_unlink_children(kvm, sp); if (!sp->root_count) { - if (!sp->role.metaphysical) + if (!sp->role.metaphysical && !sp->role.invalid) unaccount_shadowed(kvm, sp->gfn); hlist_del(&sp->hash_link); kvm_mmu_free_page(kvm, sp); } else { + int invalid = sp->role.invalid; list_move(&sp->link, &kvm->arch.active_mmu_pages); sp->role.invalid = 1; kvm_reload_remote_mmus(kvm); + if (!sp->role.metaphysical && !invalid) + unaccount_shadowed(kvm, sp->gfn); } kvm_mmu_reset_last_pte_updated(kvm); } |
