linux-kernel - [RFC 29/33] KVM: VMX: Save instruction length on EPT violation

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Message-ID: <20231108111806.92604-30-nsaenz@amazon.com>
Date:   Wed, 8 Nov 2023 11:18:02 +0000
From:   Nicolas Saenz Julienne <nsaenz@...zon.com>
To:     <kvm@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-hyperv@...r.kernel.org>,
        <pbonzini@...hat.com>, <seanjc@...gle.com>, <vkuznets@...hat.com>,
        <anelkz@...zon.com>, <graf@...zon.com>, <dwmw@...zon.co.uk>,
        <jgowans@...zon.com>, <corbert@....net>, <kys@...rosoft.com>,
        <haiyangz@...rosoft.com>, <decui@...rosoft.com>, <x86@...nel.org>,
        <linux-doc@...r.kernel.org>,
        Nicolas Saenz Julienne <nsaenz@...zon.com>
Subject: [RFC 29/33] KVM: VMX: Save instruction length on EPT violation

Save the length of the instruction that triggered an EPT violation in
struct kvm_vcpu_arch. This will be used to populate Hyper-V VSM memory
intercept messages.

Signed-off-by: Nicolas Saenz Julienne <nsaenz@...zon.com>
---
 arch/x86/include/asm/kvm_host.h | 2 ++
 arch/x86/kvm/vmx/vmx.c          | 1 +
 2 files changed, 3 insertions(+)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 1f5a85d461ce..1a854776d91e 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -967,6 +967,8 @@ struct kvm_vcpu_arch {
 	/* set at EPT violation at this point */
 	unsigned long exit_qualification;
 
+	u32 exit_instruction_len;
+
 	/* pv related host specific info */
 	struct {
 		bool pv_unhalted;
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 6e502ba93141..9c83ee3a293d 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -5773,6 +5773,7 @@ static int handle_ept_violation(struct kvm_vcpu *vcpu)
 	       PFERR_GUEST_FINAL_MASK : PFERR_GUEST_PAGE_MASK;
 
 	vcpu->arch.exit_qualification = exit_qualification;
+	vcpu->arch.exit_instruction_len = vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
 
 	/*
 	 * Check that the GPA doesn't exceed physical memory limits, as that is
-- 
2.40.1