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| author | Junaid Shahid <junaids@google.com> | 2018-05-04 11:37:13 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2018-05-11 11:21:12 +0200 |
| commit | c19986fea873f3c745122bf79013a872a190f212 (patch) | |
| tree | 3d2dd64d5a9cd0d5ef154be7cce2ca944597a8c4 | |
| parent | bcb2b94ae01009db26d1ad0811975405149b14f0 (diff) | |
| download | linux-c19986fea873f3c745122bf79013a872a190f212.tar.gz linux-c19986fea873f3c745122bf79013a872a190f212.tar.bz2 linux-c19986fea873f3c745122bf79013a872a190f212.zip | |
kvm: x86: Suppress CR3_PCID_INVD bit only when PCIDs are enabled
If the PCIDE bit is not set in CR4, then the MSb of CR3 is a reserved
bit. If the guest tries to set it, that should cause a #GP fault. So
mask out the bit only when the PCIDE bit is set.
Signed-off-by: Junaid Shahid <junaids@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | arch/x86/kvm/x86.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 44bd4a23b59c..37dd9a9d050a 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -843,7 +843,10 @@ EXPORT_SYMBOL_GPL(kvm_set_cr4); int kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3) { #ifdef CONFIG_X86_64 - cr3 &= ~CR3_PCID_INVD; + bool pcid_enabled = kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE); + + if (pcid_enabled) + cr3 &= ~CR3_PCID_INVD; #endif if (cr3 == kvm_read_cr3(vcpu) && !pdptrs_changed(vcpu)) { |