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kvm: x86: Propagate guest PCIDs to host PCIDs 

When using shadow paging mode, propagate the guest's PCID value to
the shadow CR3 in the host instead of always using PCID 0.

Signed-off-by: Junaid Shahid <junaids@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Junaid Shahid 2018-06-27 14:59:13 -07:00 committed by Paolo Bonzini
parent afe828d1de
commit c9470a2e28
1 changed files with 16 additions and 1 deletions
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17
arch/x86/kvm/mmu.h
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@ -86,10 +86,25 @@ static inline int kvm_mmu_reload(struct kvm_vcpu *vcpu)
return kvm_mmu_load(vcpu);
}
static inline unsigned long kvm_get_pcid(struct kvm_vcpu *vcpu, gpa_t cr3)
{
BUILD_BUG_ON((X86_CR3_PCID_MASK & PAGE_MASK) != 0);
return kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE)
? cr3 & X86_CR3_PCID_MASK
: 0;
}
static inline unsigned long kvm_get_active_pcid(struct kvm_vcpu *vcpu)
{
return kvm_get_pcid(vcpu, kvm_read_cr3(vcpu));
}
static inline void kvm_mmu_load_cr3(struct kvm_vcpu *vcpu)
{
if (VALID_PAGE(vcpu->arch.mmu.root_hpa))
vcpu->arch.mmu.set_cr3(vcpu, vcpu->arch.mmu.root_hpa);
vcpu->arch.mmu.set_cr3(vcpu, vcpu->arch.mmu.root_hpa |
kvm_get_active_pcid(vcpu));
}
/*