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authorAvi Kivity <avi@redhat.com>2008-12-21 19:27:36 +0200
committerAvi Kivity <avi@redhat.com>2009-03-24 11:02:51 +0200
commit2f0b3d60b2c43aef7cd10169c425c052169c622a (patch)
tree4a2afc6eee48522e380f69fc4c28abde314d3edb /arch/x86/kvm
parenta770f6f28b1a9287189f3dc8333eb694d9a2f0ab (diff)
KVM: MMU: Segregate mmu pages created with different cr4.pge settings
Don't allow a vcpu with cr4.pge cleared to use a shadow page created with cr4.pge set; this might cause a cr3 switch not to sync ptes that have the global bit set (the global bit has no effect if !cr4.pge). This can only occur on smp with different cr4.pge settings for different vcpus (since a cr4 change will resync the shadow ptes), but there's no cost to being correct here. Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/kvm')
-rw-r--r--arch/x86/kvm/x86.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 2477e87b2f8..873602b5edf 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -364,6 +364,7 @@ void kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
}
kvm_x86_ops->set_cr4(vcpu, cr4);
vcpu->arch.cr4 = cr4;
+ vcpu->arch.mmu.base_role.cr4_pge = !!(cr4 & X86_CR4_PGE);
kvm_mmu_sync_global(vcpu);
kvm_mmu_reset_context(vcpu);
}