linux-kernel - [PATCH 1/3] KVM: x86: move kvm_inject_gp up from kvm_set

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Date:   Tue,  2 Feb 2021 11:51:39 -0500
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     seanjc@...gle.com
Subject: [PATCH 1/3] KVM: x86: move kvm_inject_gp up from kvm_set_xcr 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 |  7 ++-----
 arch/x86/kvm/vmx/vmx.c |  5 ++---
 arch/x86/kvm/x86.c     | 10 ++++------
 3 files changed, 8 insertions(+), 14 deletions(-)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 687876211ebe..65d70b9691b4 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -2337,11 +2337,8 @@ static int xsetbv_interception(struct vcpu_svm *svm)
 	u64 new_bv = kvm_read_edx_eax(&svm->vcpu);
 	u32 index = kvm_rcx_read(&svm->vcpu);
 
-	if (kvm_set_xcr(&svm->vcpu, index, new_bv) == 0) {
-		return kvm_skip_emulated_instruction(&svm->vcpu);
-	}
-
-	return 1;
+	int err = kvm_set_xcr(&svm->vcpu, index, new_bv);
+	return kvm_complete_insn_gp(&svm->vcpu, err);
 }
 
 static int rdpru_interception(struct vcpu_svm *svm)
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 9986a59f71a4..28daceb4f70d 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -5227,9 +5227,8 @@ static int handle_xsetbv(struct kvm_vcpu *vcpu)
 	u64 new_bv = kvm_read_edx_eax(vcpu);
 	u32 index = kvm_rcx_read(vcpu);
 
-	if (kvm_set_xcr(vcpu, index, new_bv) == 0)
-		return kvm_skip_emulated_instruction(vcpu);
-	return 1;
+	int err = kvm_set_xcr(vcpu, index, new_bv);
+	return kvm_complete_insn_gp(vcpu, err);
 }
 
 static int handle_apic_access(struct kvm_vcpu *vcpu)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index d14230dd38d8..08568c47337c 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -986,12 +986,10 @@ static int __kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
 
 int kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
 {
-	if (static_call(kvm_x86_get_cpl)(vcpu) != 0 ||
-	    __kvm_set_xcr(vcpu, index, xcr)) {
-		kvm_inject_gp(vcpu, 0);
-		return 1;
-	}
-	return 0;
+	if (static_call(kvm_x86_get_cpl)(vcpu) == 0)
+		return __kvm_set_xcr(vcpu, index, xcr);
+
+	return 1;
 }
 EXPORT_SYMBOL_GPL(kvm_set_xcr);
 
-- 
2.26.2