KVM: VMX: Add a helper to test for a valid error code given an intr info

Add a helper, is_exception_with_error_code(), to provide the simple but
difficult to read code of checking for a valid exception with an error
code given a vmcs.VM_EXIT_INTR_INFO value.  The helper will gain another
user, vmx_get_exit_info(), in a future patch.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200923201349.16097-4-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index d440d38..4e3c620 100644 (file)
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -5956,9 +5956,7 @@ bool nested_vmx_reflect_vmexit(struct kvm_vcpu *vcpu)
         * need to be synthesized by querying the in-kernel LAPIC, but external
         * interrupts are never reflected to L1 so it's a non-issue.
         */
-       if ((exit_intr_info &
-            (INTR_INFO_VALID_MASK | INTR_INFO_DELIVER_CODE_MASK)) ==
-           (INTR_INFO_VALID_MASK | INTR_INFO_DELIVER_CODE_MASK)) {
+       if (is_exception_with_error_code(exit_intr_info)) {
                struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
 
                vmcs12->vm_exit_intr_error_code =

diff --git a/arch/x86/kvm/vmx/vmcs.h b/arch/x86/kvm/vmx/vmcs.h
index 7a3675f..1472c6c 100644 (file)
--- a/arch/x86/kvm/vmx/vmcs.h
+++ b/arch/x86/kvm/vmx/vmcs.h
@@ -138,6 +138,13 @@ static inline bool is_external_intr(u32 intr_info)
        return is_intr_type(intr_info, INTR_TYPE_EXT_INTR);
 }
 
+static inline bool is_exception_with_error_code(u32 intr_info)
+{
+       const u32 mask = INTR_INFO_VALID_MASK | INTR_INFO_DELIVER_CODE_MASK;
+
+       return (intr_info & mask) == mask;
+}
+
 enum vmcs_field_width {
        VMCS_FIELD_WIDTH_U16 = 0,
        VMCS_FIELD_WIDTH_U64 = 1,