linux-kernel - [PATCH 2/3] KVM: x86: move kvm_inject_gp up from kvm_handle

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Date:   Tue,  2 Feb 2021 11:51:40 -0500
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     seanjc@...gle.com
Subject: [PATCH 2/3] KVM: x86: move kvm_inject_gp up from kvm_handle_invpcid to callers

Push the injection of #GP up to the callers, so that they can just use
kvm_complete_insn_gp.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/kvm/svm/svm.c | 11 ++++++-----
 arch/x86/kvm/vmx/vmx.c | 11 ++++++-----
 arch/x86/kvm/x86.c     |  9 +++------
 3 files changed, 15 insertions(+), 16 deletions(-)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 65d70b9691b4..c0d41a6920f0 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -3057,6 +3057,7 @@ static int invpcid_interception(struct vcpu_svm *svm)
 	struct kvm_vcpu *vcpu = &svm->vcpu;
 	unsigned long type;
 	gva_t gva;
+	int err;
 
 	if (!guest_cpuid_has(vcpu, X86_FEATURE_INVPCID)) {
 		kvm_queue_exception(vcpu, UD_VECTOR);
@@ -3071,12 +3072,12 @@ static int invpcid_interception(struct vcpu_svm *svm)
 	type = svm->vmcb->control.exit_info_2;
 	gva = svm->vmcb->control.exit_info_1;
 
-	if (type > 3) {
-		kvm_inject_gp(vcpu, 0);
-		return 1;
-	}
+	if (type > 3)
+		err = 1;
+	else
+		err = kvm_handle_invpcid(vcpu, type, gva);
 
-	return kvm_handle_invpcid(vcpu, type, gva);
+	return kvm_complete_insn_gp(&svm->vcpu, err);
 }
 
 static int (*const svm_exit_handlers[])(struct vcpu_svm *svm) = {
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 28daceb4f70d..a07fce6d0bbb 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -5559,6 +5559,7 @@ static int handle_invpcid(struct kvm_vcpu *vcpu)
 		u64 pcid;
 		u64 gla;
 	} operand;
+	int err = 1;
 
 	if (!guest_cpuid_has(vcpu, X86_FEATURE_INVPCID)) {
 		kvm_queue_exception(vcpu, UD_VECTOR);
@@ -5568,10 +5569,8 @@ static int handle_invpcid(struct kvm_vcpu *vcpu)
 	vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
 	type = kvm_register_readl(vcpu, (vmx_instruction_info >> 28) & 0xf);
 
-	if (type > 3) {
-		kvm_inject_gp(vcpu, 0);
-		return 1;
-	}
+	if (type > 3)
+		goto out;
 
 	/* According to the Intel instruction reference, the memory operand
 	 * is read even if it isn't needed (e.g., for type==all)
@@ -5581,7 +5580,9 @@ static int handle_invpcid(struct kvm_vcpu *vcpu)
 				sizeof(operand), &gva))
 		return 1;
 
-	return kvm_handle_invpcid(vcpu, type, gva);
+	err = kvm_handle_invpcid(vcpu, type, gva);
+out:
+	return kvm_complete_insn_gp(vcpu, err);
 }
 
 static int handle_pml_full(struct kvm_vcpu *vcpu)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 08568c47337c..edbeb162012b 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -11375,7 +11375,6 @@ int kvm_handle_invpcid(struct kvm_vcpu *vcpu, unsigned long type, gva_t gva)
 		return kvm_handle_memory_failure(vcpu, r, &e);
 
 	if (operand.pcid >> 12 != 0) {
-		kvm_inject_gp(vcpu, 0);
 		return 1;
 	}
 
@@ -11385,15 +11384,13 @@ int kvm_handle_invpcid(struct kvm_vcpu *vcpu, unsigned long type, gva_t gva)
 	case INVPCID_TYPE_INDIV_ADDR:
 		if ((!pcid_enabled && (operand.pcid != 0)) ||
 		    is_noncanonical_address(operand.gla, vcpu)) {
-			kvm_inject_gp(vcpu, 0);
 			return 1;
 		}
 		kvm_mmu_invpcid_gva(vcpu, operand.gla, operand.pcid);
-		return kvm_skip_emulated_instruction(vcpu);
+		return 0;
 
 	case INVPCID_TYPE_SINGLE_CTXT:
 		if (!pcid_enabled && (operand.pcid != 0)) {
-			kvm_inject_gp(vcpu, 0);
 			return 1;
 		}
 
@@ -11414,7 +11411,7 @@ int kvm_handle_invpcid(struct kvm_vcpu *vcpu, unsigned long type, gva_t gva)
 		 * resync will happen anyway before switching to any other CR3.
 		 */
 
-		return kvm_skip_emulated_instruction(vcpu);
+		return 0;
 
 	case INVPCID_TYPE_ALL_NON_GLOBAL:
 		/*
@@ -11427,7 +11424,7 @@ int kvm_handle_invpcid(struct kvm_vcpu *vcpu, unsigned long type, gva_t gva)
 		fallthrough;
 	case INVPCID_TYPE_ALL_INCL_GLOBAL:
 		kvm_mmu_unload(vcpu);
-		return kvm_skip_emulated_instruction(vcpu);
+		return 0;
 
 	default:
 		BUG(); /* We have already checked above that type <= 3 */
-- 
2.26.2