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| author |   Marcelo Tosatti <mtosatti@redhat.com> | 2010-05-28 09:44:59 -0300 |
|---|---|---|
| committer |   Avi Kivity <avi@redhat.com> | 2010-06-09 18:48:36 +0300 |
| commit | 3be2264be3c00865116f997dc53ebcc90fe7fc4b (patch) | |
| tree | f048924efa8c802db5b3f7a60eb80142bddbe303 /arch/x86/kvm | |
| parent | KVM: SVM: Implement workaround for Erratum 383 (diff) | |
| download | linux-dev-3be2264be3c00865116f997dc53ebcc90fe7fc4b.tar.xz linux-dev-3be2264be3c00865116f997dc53ebcc90fe7fc4b.zip | |
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/x86/kvm')
| -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 81563e76e28f..6fbcb48d5a9b 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); |