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x86: KVM: svm: eliminate hardcoded RIP advancement from vmrun_interception()

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Just like we do with other intercepts, in vmrun_interception() we should be
doing kvm_skip_emulated_instruction() and not just RIP += 3. Also, it is
wrong to increment RIP before nested_svm_vmrun() as it can result in
kvm_inject_gp().

We can't call kvm_skip_emulated_instruction() after nested_svm_vmrun() so
move it inside.

Suggested-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2019-08-13 15:53:35 +02:00 committed by Paolo Bonzini
parent e7134c1bb5
commit c8e16b78c6
1 changed files with 10 additions and 10 deletions
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18
arch/x86/kvm/svm.c
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@ -3585,7 +3585,7 @@ static void enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb_gpa,
static int nested_svm_vmrun(struct vcpu_svm *svm)
{
int rc;
int ret;
struct vmcb *nested_vmcb;
struct vmcb *hsave = svm->nested.hsave;
struct vmcb *vmcb = svm->vmcb;
@ -3594,13 +3594,16 @@ static int nested_svm_vmrun(struct vcpu_svm *svm)
vmcb_gpa = svm->vmcb->save.rax;
rc = kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(vmcb_gpa), &map);
if (rc) {
if (rc == -EINVAL)
ret = kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(vmcb_gpa), &map);
if (ret == EINVAL) {
kvm_inject_gp(&svm->vcpu, 0);
return 1;
} else if (ret) {
return kvm_skip_emulated_instruction(&svm->vcpu);
}
ret = kvm_skip_emulated_instruction(&svm->vcpu);
nested_vmcb = map.hva;
if (!nested_vmcb_checks(nested_vmcb)) {
@ -3611,7 +3614,7 @@ static int nested_svm_vmrun(struct vcpu_svm *svm)
kvm_vcpu_unmap(&svm->vcpu, &map, true);
return 1;
return ret;
}
trace_kvm_nested_vmrun(svm->vmcb->save.rip, vmcb_gpa,
@ -3664,7 +3667,7 @@ static int nested_svm_vmrun(struct vcpu_svm *svm)
nested_svm_vmexit(svm);
}
return 1;
return ret;
}
static void nested_svm_vmloadsave(struct vmcb *from_vmcb, struct vmcb *to_vmcb)
@ -3740,9 +3743,6 @@ static int vmrun_interception(struct vcpu_svm *svm)
if (nested_svm_check_permissions(svm))
return 1;
/* Save rip after vmrun instruction */
kvm_rip_write(&svm->vcpu, kvm_rip_read(&svm->vcpu) + 3);
return nested_svm_vmrun(svm);
}