On 3/4/22 20:49, isaku.yamahata@xxxxxxxxx wrote:
From: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
Because guest TD state is protected, exceptions in guest TDs can't be
intercepted. TDX VMM doesn't need to handle exceptions.
tdx_handle_exit_irqoff() handles NMI and machine check. Ignore NMI and
machine check and continue guest TD execution.
For external interrupt, increment stats same to the VMX case.
Signed-off-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
---
arch/x86/kvm/vmx/tdx.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index 2c35dcad077e..dc83414cb72a 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -800,6 +800,23 @@ void tdx_handle_exit_irqoff(struct kvm_vcpu *vcpu)
tdexit_intr_info(vcpu));
}
+static int tdx_handle_exception(struct kvm_vcpu *vcpu)
+{
+ u32 intr_info = tdexit_intr_info(vcpu);
+
+ if (is_nmi(intr_info) || is_machine_check(intr_info))
+ return 1;
+
+ kvm_pr_unimpl("unexpected exception 0x%x\n", intr_info);
+ return -EFAULT;
+}
+
+static int tdx_handle_external_interrupt(struct kvm_vcpu *vcpu)
+{
+ ++vcpu->stat.irq_exits;
+ return 1;
+}
+
static int tdx_handle_triple_fault(struct kvm_vcpu *vcpu)
{
vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN;
@@ -1131,6 +1148,10 @@ int tdx_handle_exit(struct kvm_vcpu *vcpu, fastpath_t fastpath)
WARN_ON_ONCE(fastpath != EXIT_FASTPATH_NONE);
switch (exit_reason.basic) {
+ case EXIT_REASON_EXCEPTION_NMI:
+ return tdx_handle_exception(vcpu);
+ case EXIT_REASON_EXTERNAL_INTERRUPT:
+ return tdx_handle_external_interrupt(vcpu);
case EXIT_REASON_EPT_VIOLATION:
return tdx_handle_ept_violation(vcpu);
case EXIT_REASON_EPT_MISCONFIG:
Reviewed-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
