linux-kernel - [PATCH v16 069/116] KVM: TDX: complete interrupts after tdexit

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Message-Id: <b4c03a8eb5dc68965fd9ccf5ceb0beacf4845c89.1697471314.git.isaku.yamahata@intel.com>
Date:   Mon, 16 Oct 2023 09:14:21 -0700
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>,
        Kai Huang <kai.huang@...el.com>,
        Zhi Wang <zhi.wang.linux@...il.com>, chen.bo@...el.com,
        hang.yuan@...el.com, tina.zhang@...el.com
Subject: [PATCH v16 069/116] 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>
Reviewed-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/kvm/vmx/tdx.c | 10 ++++++++++
 arch/x86/kvm/vmx/tdx.h |  2 ++
 2 files changed, 12 insertions(+)

diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index b5493d6c7cdd..e29df39630e8 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -509,6 +509,14 @@ void tdx_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
 	 */
 }
 
+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;
@@ -637,6 +645,8 @@ 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);
+
 	return EXIT_FASTPATH_NONE;
 }
 
diff --git a/arch/x86/kvm/vmx/tdx.h b/arch/x86/kvm/vmx/tdx.h
index 45f5c2744d78..c700792c08e2 100644
--- a/arch/x86/kvm/vmx/tdx.h
+++ b/arch/x86/kvm/vmx/tdx.h
@@ -200,6 +200,8 @@ TDX_BUILD_TDVPS_ACCESSORS(16, VMCS, vmcs);
 TDX_BUILD_TDVPS_ACCESSORS(32, VMCS, vmcs);
 TDX_BUILD_TDVPS_ACCESSORS(64, VMCS, vmcs);
 
+TDX_BUILD_TDVPS_ACCESSORS(8, MANAGEMENT, management);
+
 static __always_inline u64 td_tdcs_exec_read64(struct kvm_tdx *kvm_tdx, u32 field)
 {
 	struct tdx_module_args out;
-- 
2.25.1