linux-kernel - [tip: x86/fred] KVM: VMX: Call fred_entry_from

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Date: Wed, 31 Jan 2024 21:14:40 -0000
From: "tip-bot2 for Xin Li" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Xin Li <xin3.li@...el.com>, Thomas Gleixner <tglx@...utronix.de>,
 "Borislav Petkov (AMD)" <bp@...en8.de>, Shan Kang <shan.kang@...el.com>,
 Paolo Bonzini <pbonzini@...hat.com>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject:
 [tip: x86/fred] KVM: VMX: Call fred_entry_from_kvm() for IRQ/NMI handling

The following commit has been merged into the x86/fred branch of tip:

Commit-ID:     70d0fe5d0923abfb28c26e71171944f4801f9f38
Gitweb:        https://git.kernel.org/tip/70d0fe5d0923abfb28c26e71171944f4801f9f38
Author:        Xin Li <xin3.li@...el.com>
AuthorDate:    Tue, 05 Dec 2023 02:50:21 -08:00
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Wed, 31 Jan 2024 22:03:20 +01:00

KVM: VMX: Call fred_entry_from_kvm() for IRQ/NMI handling

When FRED is enabled, call fred_entry_from_kvm() to handle IRQ/NMI in
IRQ/NMI induced VM exits.

Signed-off-by: Xin Li <xin3.li@...el.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Tested-by: Shan Kang <shan.kang@...el.com>
Acked-by: Paolo Bonzini <pbonzini@...hat.com>
Link: https://lore.kernel.org/r/20231205105030.8698-33-xin3.li@intel.com
---
 arch/x86/kvm/vmx/vmx.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index e262bc2..cce92f7 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -38,6 +38,7 @@
 #include <asm/desc.h>
 #include <asm/fpu/api.h>
 #include <asm/fpu/xstate.h>
+#include <asm/fred.h>
 #include <asm/idtentry.h>
 #include <asm/io.h>
 #include <asm/irq_remapping.h>
@@ -6960,14 +6961,16 @@ static void handle_external_interrupt_irqoff(struct kvm_vcpu *vcpu)
 {
 	u32 intr_info = vmx_get_intr_info(vcpu);
 	unsigned int vector = intr_info & INTR_INFO_VECTOR_MASK;
-	gate_desc *desc = (gate_desc *)host_idt_base + vector;
 
 	if (KVM_BUG(!is_external_intr(intr_info), vcpu->kvm,
 	    "unexpected VM-Exit interrupt info: 0x%x", intr_info))
 		return;
 
 	kvm_before_interrupt(vcpu, KVM_HANDLING_IRQ);
-	vmx_do_interrupt_irqoff(gate_offset(desc));
+	if (cpu_feature_enabled(X86_FEATURE_FRED))
+		fred_entry_from_kvm(EVENT_TYPE_EXTINT, vector);
+	else
+		vmx_do_interrupt_irqoff(gate_offset((gate_desc *)host_idt_base + vector));
 	kvm_after_interrupt(vcpu);
 
 	vcpu->arch.at_instruction_boundary = true;
@@ -7260,7 +7263,10 @@ static noinstr void vmx_vcpu_enter_exit(struct kvm_vcpu *vcpu,
 	if ((u16)vmx->exit_reason.basic == EXIT_REASON_EXCEPTION_NMI &&
 	    is_nmi(vmx_get_intr_info(vcpu))) {
 		kvm_before_interrupt(vcpu, KVM_HANDLING_NMI);
-		vmx_do_nmi_irqoff();
+		if (cpu_feature_enabled(X86_FEATURE_FRED))
+			fred_entry_from_kvm(EVENT_TYPE_NMI, NMI_VECTOR);
+		else
+			vmx_do_nmi_irqoff();
 		kvm_after_interrupt(vcpu);
 	}