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KVM: VMX: don't configure EPT identity map for unrestricted guest

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An unrestricted guest can run with hardware CR0.PG==0, i.e.
IA32 paging disabled, in which case there is no need to load
the guest's CR3 with identity mapped IA32 page tables since
hardware will effectively ignore CR3.  If unrestricted guest
is enabled, don't configure the identity mapped IA32 page
table and always load the guest's desired CR3.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
This commit is contained in:
Sean Christopherson 2018-03-05 12:04:37 -08:00 committed by Paolo Bonzini
parent f7eaeb0ad8
commit e90008df16
1 changed files with 3 additions and 2 deletions
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5
arch/x86/kvm/vmx.c
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@ -4490,7 +4490,8 @@ static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
if (enable_ept) { if (enable_ept) {
eptp = construct_eptp(vcpu, cr3); eptp = construct_eptp(vcpu, cr3);
vmcs_write64(EPT_POINTER, eptp); vmcs_write64(EPT_POINTER, eptp);
if (is_paging(vcpu) || is_guest_mode(vcpu)) if (enable_unrestricted_guest || is_paging(vcpu) ||
is_guest_mode(vcpu))
guest_cr3 = kvm_read_cr3(vcpu); guest_cr3 = kvm_read_cr3(vcpu);
else else
guest_cr3 = vcpu->kvm->arch.ept_identity_map_addr; guest_cr3 = vcpu->kvm->arch.ept_identity_map_addr;
@ -9801,7 +9802,7 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
goto free_vmcs; goto free_vmcs;
} }
if (enable_ept) { if (enable_ept && !enable_unrestricted_guest) {
err = init_rmode_identity_map(kvm); err = init_rmode_identity_map(kvm);
if (err) if (err)
goto free_vmcs; goto free_vmcs;