linux-kernel - [PATCH 1/6] KVM: x86: add an emulation_reason to x86_emulate

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Date:   Mon, 12 Apr 2021 14:09:32 +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 1/6] KVM: x86: add an emulation_reason to x86_emulate_instruction()

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

Emulation can happen for a variety of reasons, yet on error we have no
idea exactly what triggered it. Expand x86_emulate_instruction() to
carry an @emulation_reason argument.

Signed-off-by: Joao Martins <joao.m.martins@...cle.com>
Signed-off-by: David Edmondson <david.edmondson@...cle.com>
---
 arch/x86/kvm/mmu/mmu.c | 4 ++--
 arch/x86/kvm/x86.c     | 7 ++++---
 arch/x86/kvm/x86.h     | 3 ++-
 3 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 951dae4e7175..515ff790b7c5 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -5056,8 +5056,8 @@ int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, u64 error_code,
 	if (!mmio_info_in_cache(vcpu, cr2_or_gpa, direct) && !is_guest_mode(vcpu))
 		emulation_type |= EMULTYPE_ALLOW_RETRY_PF;
 emulate:
-	return x86_emulate_instruction(vcpu, cr2_or_gpa, emulation_type, insn,
-				       insn_len);
+	return x86_emulate_instruction(vcpu, cr2_or_gpa, emulation_type, 0,
+				       insn, insn_len);
 }
 EXPORT_SYMBOL_GPL(kvm_mmu_page_fault);
 
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index eca63625aee4..87e76f3aee64 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7445,7 +7445,8 @@ int x86_decode_emulated_instruction(struct kvm_vcpu *vcpu, int emulation_type,
 EXPORT_SYMBOL_GPL(x86_decode_emulated_instruction);
 
 int x86_emulate_instruction(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
-			    int emulation_type, void *insn, int insn_len)
+			    int emulation_type, int emulation_reason,
+			    void *insn, int insn_len)
 {
 	int r;
 	struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt;
@@ -7604,14 +7605,14 @@ int x86_emulate_instruction(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
 
 int kvm_emulate_instruction(struct kvm_vcpu *vcpu, int emulation_type)
 {
-	return x86_emulate_instruction(vcpu, 0, emulation_type, NULL, 0);
+	return x86_emulate_instruction(vcpu, 0, emulation_type, 0, NULL, 0);
 }
 EXPORT_SYMBOL_GPL(kvm_emulate_instruction);
 
 int kvm_emulate_instruction_from_buffer(struct kvm_vcpu *vcpu,
 					void *insn, int insn_len)
 {
-	return x86_emulate_instruction(vcpu, 0, 0, insn, insn_len);
+	return x86_emulate_instruction(vcpu, 0, 0, 0, insn, insn_len);
 }
 EXPORT_SYMBOL_GPL(kvm_emulate_instruction_from_buffer);
 
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index 9035e34aa156..5686436c99da 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -276,7 +276,8 @@ void kvm_fixup_and_inject_pf_error(struct kvm_vcpu *vcpu, gva_t gva, u16 error_c
 int x86_decode_emulated_instruction(struct kvm_vcpu *vcpu, int emulation_type,
 				    void *insn, int insn_len);
 int x86_emulate_instruction(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
-			    int emulation_type, void *insn, int insn_len);
+			    int emulation_type, int emulation_reason,
+			    void *insn, int insn_len);
 fastpath_t handle_fastpath_set_msr_irqoff(struct kvm_vcpu *vcpu);
 
 extern u64 host_xcr0;
-- 
2.30.2