diff options
| author | Marcelo Tosatti <mtosatti@redhat.com> | 2010-05-28 09:44:59 -0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-08-02 10:26:44 -0700 |
| commit | 9a7c231ca5905895764203e97f87457ae045f2c0 (patch) | |
| tree | 495ef1eee4800805719f384bad661c6205e6e829 | |
| parent | e94be20611f9b27a47adb6b2b47105ee7dffbf74 (diff) | |
KVM: MMU: invalidate and flush on spte small->large page size change
Always invalidate spte and flush TLBs when changing page size, to make
sure different sized translations for the same address are never cached
in a CPU's TLB.
Currently the only case where this occurs is when a non-leaf spte pointer is
overwritten by a leaf, large spte entry. This can happen after dirty
logging is disabled on a memslot, for example.
Noticed by Andrea.
KVM-Stable-Tag
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
(cherry picked from commit 3be2264be3c00865116f997dc53ebcc90fe7fc4b)
| -rw-r--r-- | arch/x86/kvm/mmu.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 99f646f7c6a..ca7c5282add 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -1907,6 +1907,8 @@ static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep, child = page_header(pte & PT64_BASE_ADDR_MASK); mmu_page_remove_parent_pte(child, sptep); + __set_spte(sptep, shadow_trap_nonpresent_pte); + kvm_flush_remote_tlbs(vcpu->kvm); } else if (pfn != spte_to_pfn(*sptep)) { pgprintk("hfn old %lx new %lx\n", spte_to_pfn(*sptep), pfn); |