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Message-Id: <014bd803709f234942f0bcff754115489c4ffdb0.1673539699.git.isaku.yamahata@intel.com>
Date: Thu, 12 Jan 2023 08:32:36 -0800
From: isaku.yamahata@...el.com
To: kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: isaku.yamahata@...el.com, isaku.yamahata@...il.com,
Paolo Bonzini <pbonzini@...hat.com>, erdemaktas@...gle.com,
Sean Christopherson <seanjc@...gle.com>,
Sagi Shahar <sagis@...gle.com>,
David Matlack <dmatlack@...gle.com>
Subject: [PATCH v11 088/113] KVM: TDX: handle EXCEPTION_NMI and EXTERNAL_INTERRUPT
From: Isaku Yamahata <isaku.yamahata@...el.com>
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@...el.com>
Reviewed-by: Paolo Bonzini <pbonzini@...hat.com>
---
arch/x86/kvm/vmx/tdx.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index 2bea7c96536b..d3181e191adf 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -742,6 +742,25 @@ 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(exit_reason 0x%llx qual 0x%lx)\n",
+ intr_info,
+ to_tdx(vcpu)->exit_reason.full, tdexit_exit_qual(vcpu));
+ 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;
@@ -1161,6 +1180,10 @@ 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:
--
2.25.1
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