KVM: x86: remove exit_int_info warning in svm_handle_exit

It is valid to receive external interrupt and have broken IDT entry,
which will lead to #GP with exit_int_into that will contain the index of
the IDT entry (e.g any value).

Other exceptions can happen as well, like #NP or #SS
(if stack switch fails).

Thus this warning can be user triggred and has very little value.

Cc: stable@vger.kernel.org
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20221103141351.50662-10-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 098f04b..c0950ae 100644 (file)
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -346,12 +346,6 @@ int svm_set_efer(struct kvm_vcpu *vcpu, u64 efer)
        return 0;
 }
 
-static int is_external_interrupt(u32 info)
-{
-       info &= SVM_EVTINJ_TYPE_MASK | SVM_EVTINJ_VALID;
-       return info == (SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_INTR);
-}
-
 static u32 svm_get_interrupt_shadow(struct kvm_vcpu *vcpu)
 {
        struct vcpu_svm *svm = to_svm(vcpu);
@@ -3426,15 +3420,6 @@ static int svm_handle_exit(struct kvm_vcpu *vcpu, fastpath_t exit_fastpath)
                return 0;
        }
 
-       if (is_external_interrupt(svm->vmcb->control.exit_int_info) &&
-           exit_code != SVM_EXIT_EXCP_BASE + PF_VECTOR &&
-           exit_code != SVM_EXIT_NPF && exit_code != SVM_EXIT_TASK_SWITCH &&
-           exit_code != SVM_EXIT_INTR && exit_code != SVM_EXIT_NMI)
-               printk(KERN_ERR "%s: unexpected exit_int_info 0x%x "
-                      "exit_code 0x%x\n",
-                      __func__, svm->vmcb->control.exit_int_info,
-                      exit_code);
-
        if (exit_fastpath != EXIT_FASTPATH_NONE)
                return 1;