linux-kernel - [RFC PATCH v5 070/104] KVM: TDX: complete interrupts after tdexit

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Message-Id: <45507ecee0a0d23229e9e7f8bb74077034a40bcd.1646422845.git.isaku.yamahata@intel.com>
Date:   Fri,  4 Mar 2022 11:49:26 -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>,
        Jim Mattson <jmattson@...gle.com>, erdemaktas@...gle.com,
        Connor Kuehl <ckuehl@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>
Subject: [RFC PATCH v5 070/104] KVM: TDX: complete interrupts after tdexit

From: Isaku Yamahata <isaku.yamahata@...el.com>

This corresponds to VMX __vmx_complete_interrupts().  Because TDX
virtualize vAPIC, KVM only needs to care NMI injection.

Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
---
 arch/x86/kvm/vmx/tdx.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index c1366aac7d96..3cb2fbd1c12c 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -550,6 +550,14 @@ void tdx_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
 	vcpu->kvm->vm_bugged = true;
 }
 
+static void tdx_complete_interrupts(struct kvm_vcpu *vcpu)
+{
+	/* Avoid costly SEAMCALL if no nmi was injected */
+	if (vcpu->arch.nmi_injected)
+		vcpu->arch.nmi_injected = td_management_read8(to_tdx(vcpu),
+							      TD_VCPU_PEND_NMI);
+}
+
 struct tdx_uret_msr {
 	u32 msr;
 	unsigned int slot;
@@ -618,6 +626,8 @@ fastpath_t tdx_vcpu_run(struct kvm_vcpu *vcpu)
 	vcpu->arch.regs_avail &= ~VMX_REGS_LAZY_LOAD_SET;
 	trace_kvm_exit(vcpu, KVM_ISA_VMX);
 
+	tdx_complete_interrupts(vcpu);
+
 	if (tdx->exit_reason.error || tdx->exit_reason.non_recoverable)
 		return EXIT_FASTPATH_NONE;
 	return EXIT_FASTPATH_NONE;
-- 
2.25.1