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KVM: x86: Handle emulation failure directly in kvm_task_switch()

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Consolidate the reporting of emulation failure into kvm_task_switch()
so that it can return EMULATE_USER_EXIT.  This helps pave the way for
removing EMULATE_FAIL altogether.

This also fixes a theoretical bug where task switch interception could
suppress an EMULATE_USER_EXIT return.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson
2019-08-27 14:40:35 -07:00
committed by Paolo Bonzini
parent 738fece46d
commit 1051778f6e
3 changed files with 11 additions and 23 deletions
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11
arch/x86/kvm/svm.c
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@@ -3892,17 +3892,10 @@ static int task_switch_interception(struct vcpu_svm *svm)
if (int_type != SVM_EXITINTINFO_TYPE_SOFT)
int_vec = -1;
if (kvm_task_switch(&svm->vcpu, tss_selector, int_vec, reason,
has_error_code, error_code) == EMULATE_FAIL)
goto fail;
return 1;
fail:
svm->vcpu.run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
svm->vcpu.run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
svm->vcpu.run->internal.ndata = 0;
return 0;
return kvm_task_switch(&svm->vcpu, tss_selector, int_vec, reason,
has_error_code, error_code) != EMULATE_USER_EXIT;
}
static int cpuid_interception(struct vcpu_svm *svm)