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authorMarcelo Tosatti <mtosatti@redhat.com>2010-05-28 12:44:59 (GMT)
committerAvi Kivity <avi@redhat.com>2010-06-09 15:48:36 (GMT)
commit3be2264be3c00865116f997dc53ebcc90fe7fc4b (patch)
treef048924efa8c802db5b3f7a60eb80142bddbe303 /arch
parent67ec66077799f2fef84b21a643912b179c422281 (diff)
downloadlinux-3be2264be3c00865116f997dc53ebcc90fe7fc4b.tar.xz
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kvm/mmu.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 81563e7..6fbcb48 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1870,6 +1870,8 @@ 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);