diff options
| author | Yu Zhang <yu.c.zhang@linux.intel.com> | 2017-08-24 15:27:53 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2017-08-24 19:09:16 +0300 |
| commit | d1cd3ce9004412949163bfaa062a4df98fe75a98 (patch) | |
| tree | 2e1f466ee6a60218518586f64058f23a0b3fb68f /arch/x86/kvm/x86.c | |
| parent | e911eb3b3414e62cbd9853e0a91c124f4a545c0f (diff) | |
| download | linux-d1cd3ce9004412949163bfaa062a4df98fe75a98.tar.xz | |
KVM: MMU: check guest CR3 reserved bits based on its physical address width.
Currently, KVM uses CR3_L_MODE_RESERVED_BITS to check the
reserved bits in CR3. Yet the length of reserved bits in
guest CR3 should be based on the physical address width
exposed to the VM. This patch changes CR3 check logic to
calculate the reserved bits at runtime.
Signed-off-by: Yu Zhang <yu.c.zhang@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/x86.c')
| -rw-r--r-- | arch/x86/kvm/x86.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index cc2c7e413e9c..79f5889f8c12 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -813,10 +813,10 @@ int kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3) return 0; } - if (is_long_mode(vcpu)) { - if (cr3 & CR3_L_MODE_RESERVED_BITS) - return 1; - } else if (is_pae(vcpu) && is_paging(vcpu) && + if (is_long_mode(vcpu) && + (cr3 & rsvd_bits(cpuid_maxphyaddr(vcpu), 62))) + return 1; + else if (is_pae(vcpu) && is_paging(vcpu) && !load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3)) return 1; |