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KVM: VMX: WARN on a MOV CR3 exit w/ unrestricted guest

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CR3 load/store exiting are always off when unrestricted guest
is enabled.  WARN on the associated CR3 VMEXIT to detect code
that would re-introduce CR3 load/store exiting for unrestricted
guest.

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 12:04:41 -08:00 committed by Paolo Bonzini
parent b4d185175b
commit e1de91ccab
1 changed files with 2 additions and 0 deletions
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2
arch/x86/kvm/vmx.c
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@ -6377,6 +6377,7 @@ static int handle_cr(struct kvm_vcpu *vcpu)
err = handle_set_cr0(vcpu, val);
return kvm_complete_insn_gp(vcpu, err);
case 3:
WARN_ON_ONCE(enable_unrestricted_guest);
err = kvm_set_cr3(vcpu, val);
return kvm_complete_insn_gp(vcpu, err);
case 4:
@ -6409,6 +6410,7 @@ static int handle_cr(struct kvm_vcpu *vcpu)
case 1: /*mov from cr*/
switch (cr) {
case 3:
WARN_ON_ONCE(enable_unrestricted_guest);
val = kvm_read_cr3(vcpu);
kvm_register_write(vcpu, reg, val);
trace_kvm_cr_read(cr, val);