[RFC PATCH v2 10/33] KVM: SVM: Prepare for SEV-ES exit handling in the sev.c file

[Tom Lendacky]

From: Tom Lendacky <thomas.lenda...@amd.com>

This is a pre-patch to consolidate some exit handling code into callable
functions. Follow-on patches for SEV-ES exit handling will then be able
to use them from the sev.c file.

Signed-off-by: Tom Lendacky <thomas.lenda...@amd.com>
---
 arch/x86/kvm/svm/svm.c | 64 +++++++++++++++++++++++++-----------------
 1 file changed, 38 insertions(+), 26 deletions(-)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 5fd77229fefc..ccae0f63e784 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -3156,6 +3156,43 @@ static void dump_vmcb(struct kvm_vcpu *vcpu)
               "excp_to:", save->last_excp_to);
 }
 
+static int svm_handle_invalid_exit(struct kvm_vcpu *vcpu, u64 exit_code)
+{
+       if (exit_code < ARRAY_SIZE(svm_exit_handlers) &&
+           svm_exit_handlers[exit_code])
+               return 0;
+
+       vcpu_unimpl(vcpu, "svm: unexpected exit reason 0x%llx\n", exit_code);
+       dump_vmcb(vcpu);
+       vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+       vcpu->run->internal.suberror = 
KVM_INTERNAL_ERROR_UNEXPECTED_EXIT_REASON;
+       vcpu->run->internal.ndata = 2;
+       vcpu->run->internal.data[0] = exit_code;
+       vcpu->run->internal.data[1] = vcpu->arch.last_vmentry_cpu;
+
+       return -EINVAL;
+}
+
+static int svm_invoke_exit_handler(struct vcpu_svm *svm, u64 exit_code)
+{
+       if (svm_handle_invalid_exit(&svm->vcpu, exit_code))
+               return 0;
+
+#ifdef CONFIG_RETPOLINE
+       if (exit_code == SVM_EXIT_MSR)
+               return msr_interception(svm);
+       else if (exit_code == SVM_EXIT_VINTR)
+               return interrupt_window_interception(svm);
+       else if (exit_code == SVM_EXIT_INTR)
+               return intr_interception(svm);
+       else if (exit_code == SVM_EXIT_HLT)
+               return halt_interception(svm);
+       else if (exit_code == SVM_EXIT_NPF)
+               return npf_interception(svm);
+#endif
+       return svm_exit_handlers[exit_code](svm);
+}
+
 static void svm_get_exit_info(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2,
                              u32 *intr_info, u32 *error_code)
 {
@@ -3222,32 +3259,7 @@ static int handle_exit(struct kvm_vcpu *vcpu, fastpath_t 
exit_fastpath)
        if (exit_fastpath != EXIT_FASTPATH_NONE)
                return 1;
 
-       if (exit_code >= ARRAY_SIZE(svm_exit_handlers)
-           || !svm_exit_handlers[exit_code]) {
-               vcpu_unimpl(vcpu, "svm: unexpected exit reason 0x%x\n", 
exit_code);
-               dump_vmcb(vcpu);
-               vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
-               vcpu->run->internal.suberror =
-                       KVM_INTERNAL_ERROR_UNEXPECTED_EXIT_REASON;
-               vcpu->run->internal.ndata = 2;
-               vcpu->run->internal.data[0] = exit_code;
-               vcpu->run->internal.data[1] = vcpu->arch.last_vmentry_cpu;
-               return 0;
-       }
-
-#ifdef CONFIG_RETPOLINE
-       if (exit_code == SVM_EXIT_MSR)
-               return msr_interception(svm);
-       else if (exit_code == SVM_EXIT_VINTR)
-               return interrupt_window_interception(svm);
-       else if (exit_code == SVM_EXIT_INTR)
-               return intr_interception(svm);
-       else if (exit_code == SVM_EXIT_HLT)
-               return halt_interception(svm);
-       else if (exit_code == SVM_EXIT_NPF)
-               return npf_interception(svm);
-#endif
-       return svm_exit_handlers[exit_code](svm);
+       return svm_invoke_exit_handler(svm, exit_code);
 }
 
 static void reload_tss(struct kvm_vcpu *vcpu)
-- 
2.28.0