linux-kernel - [PATCH 6/6] KVM: VMX: pass a proper reason in kvm_emulate

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Date:   Mon, 12 Apr 2021 14:09:37 +0100
From:   David Edmondson <david.edmondson@...cle.com>
To:     linux-kernel@...r.kernel.org
Cc:     kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Sean Christopherson <seanjc@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Joerg Roedel <joro@...tes.org>,
        Wanpeng Li <wanpengli@...cent.com>,
        Borislav Petkov <bp@...en8.de>,
        Jim Mattson <jmattson@...gle.com>,
        Ingo Molnar <mingo@...hat.com>,
        Joao Martins <joao.m.martins@...cle.com>,
        David Edmondson <david.edmondson@...cle.com>
Subject: [PATCH 6/6] KVM: VMX: pass a proper reason in kvm_emulate_instruction()

From: Joao Martins <joao.m.martins@...cle.com>

Declare various causes of emulation and use them as appropriate.

Signed-off-by: Joao Martins <joao.m.martins@...cle.com>
Signed-off-by: David Edmondson <david.edmondson@...cle.com>
---
 arch/x86/include/asm/kvm_host.h |  5 +++++
 arch/x86/kvm/vmx/vmx.c          | 17 +++++++++--------
 2 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index e1284680cbdc..f401e7c79ded 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1541,6 +1541,11 @@ enum {
 	EMULREASON_SVM_CR,
 	EMULREASON_SVM_DR,
 	EMULREASON_SVM_AVIC_UNACCEL,
+	EMULREASON_VMX_APIC_ACCESS,
+	EMULREASON_VMX_EPT_VIOLATION,
+	EMULREASON_VMX_DESC,
+	EMULREASON_VMX_INV_GUEST,
+	EMULREASON_VMX_RMODE_EX,
 };
 
 int kvm_emulate_instruction(struct kvm_vcpu *vcpu, int emulation_type,
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 037b01b5a54b..799eb0713b76 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -1600,7 +1600,7 @@ static int skip_emulated_instruction(struct kvm_vcpu *vcpu)
 #endif
 		kvm_rip_write(vcpu, rip);
 	} else {
-		if (!kvm_emulate_instruction(vcpu, EMULTYPE_SKIP, 0))
+		if (!kvm_emulate_instruction(vcpu, EMULTYPE_SKIP, EMULREASON_SKIP))
 			return 0;
 	}
 
@@ -4738,7 +4738,7 @@ static int handle_rmode_exception(struct kvm_vcpu *vcpu,
 	 * Cause the #SS fault with 0 error code in VM86 mode.
 	 */
 	if (((vec == GP_VECTOR) || (vec == SS_VECTOR)) && err_code == 0) {
-		if (kvm_emulate_instruction(vcpu, 0, 0)) {
+		if (kvm_emulate_instruction(vcpu, 0, EMULREASON_VMX_RMODE_EX)) {
 			if (vcpu->arch.halt_request) {
 				vcpu->arch.halt_request = 0;
 				return kvm_vcpu_halt(vcpu);
@@ -4816,7 +4816,8 @@ static int handle_exception_nmi(struct kvm_vcpu *vcpu)
 			kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
 			return 1;
 		}
-		return kvm_emulate_instruction(vcpu, EMULTYPE_VMWARE_GP, 0);
+		return kvm_emulate_instruction(vcpu, EMULTYPE_VMWARE_GP,
+					       EMULREASON_GP);
 	}
 
 	/*
@@ -4930,7 +4931,7 @@ static int handle_io(struct kvm_vcpu *vcpu)
 	++vcpu->stat.io_exits;
 
 	if (string)
-		return kvm_emulate_instruction(vcpu, 0, 0);
+		return kvm_emulate_instruction(vcpu, 0, EMULREASON_IO);
 
 	port = exit_qualification >> 16;
 	size = (exit_qualification & 7) + 1;
@@ -5004,7 +5005,7 @@ static int handle_set_cr4(struct kvm_vcpu *vcpu, unsigned long val)
 static int handle_desc(struct kvm_vcpu *vcpu)
 {
 	WARN_ON(!(vcpu->arch.cr4 & X86_CR4_UMIP));
-	return kvm_emulate_instruction(vcpu, 0, 0);
+	return kvm_emulate_instruction(vcpu, 0, EMULREASON_VMX_DESC);
 }
 
 static int handle_cr(struct kvm_vcpu *vcpu)
@@ -5244,7 +5245,7 @@ static int handle_apic_access(struct kvm_vcpu *vcpu)
 			return kvm_skip_emulated_instruction(vcpu);
 		}
 	}
-	return kvm_emulate_instruction(vcpu, 0, 0);
+	return kvm_emulate_instruction(vcpu, 0, EMULREASON_VMX_APIC_ACCESS);
 }
 
 static int handle_apic_eoi_induced(struct kvm_vcpu *vcpu)
@@ -5375,7 +5376,7 @@ static int handle_ept_violation(struct kvm_vcpu *vcpu)
 	 * reconstruct the page fault error code.
 	 */
 	if (unlikely(allow_smaller_maxphyaddr && kvm_vcpu_is_illegal_gpa(vcpu, gpa)))
-		return kvm_emulate_instruction(vcpu, 0, 0);
+		return kvm_emulate_instruction(vcpu, 0, EMULREASON_VMX_EPT_VIOLATION);
 
 	return kvm_mmu_page_fault(vcpu, gpa, error_code, NULL, 0);
 }
@@ -5424,7 +5425,7 @@ static int handle_invalid_guest_state(struct kvm_vcpu *vcpu)
 		if (kvm_test_request(KVM_REQ_EVENT, vcpu))
 			return 1;
 
-		if (!kvm_emulate_instruction(vcpu, 0, 0))
+		if (!kvm_emulate_instruction(vcpu, 0, EMULREASON_VMX_INV_GUEST))
 			return 0;
 
 		if (vmx->emulation_required && !vmx->rmode.vm86_active &&
-- 
2.30.2