diff options
Diffstat (limited to 'arch/x86/kvm/mmu/spte.c')
-rw-r--r-- | arch/x86/kvm/mmu/spte.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/arch/x86/kvm/mmu/spte.c b/arch/x86/kvm/mmu/spte.c index 8e8e8da740a0..246e61e0771e 100644 --- a/arch/x86/kvm/mmu/spte.c +++ b/arch/x86/kvm/mmu/spte.c @@ -147,13 +147,19 @@ int make_spte(struct kvm_vcpu *vcpu, unsigned int pte_access, int level, /* * Optimization: for pte sync, if spte was writable the hash * lookup is unnecessary (and expensive). Write protection - * is responsibility of mmu_get_page / kvm_sync_page. + * is responsibility of kvm_mmu_get_page / kvm_mmu_sync_roots. * Same reasoning can be applied to dirty page accounting. */ if (!can_unsync && is_writable_pte(old_spte)) goto out; - if (mmu_need_write_protect(vcpu, gfn, can_unsync)) { + /* + * Unsync shadow pages that are reachable by the new, writable + * SPTE. Write-protect the SPTE if the page can't be unsync'd, + * e.g. it's write-tracked (upper-level SPs) or has one or more + * shadow pages and unsync'ing pages is not allowed. + */ + if (mmu_try_to_unsync_pages(vcpu, gfn, can_unsync)) { pgprintk("%s: found shadow page for %llx, marking ro\n", __func__, gfn); ret |= SET_SPTE_WRITE_PROTECTED_PT; |