linux-kernel - [Patch v4 08/13] KVM: x86: hyper-v: Use common code for hypercall userspace exit

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Date:   Mon, 12 Dec 2022 10:37:15 -0800
From:   Vipin Sharma <vipinsh@...gle.com>
To:     seanjc@...gle.com, pbonzini@...hat.com, vkuznets@...hat.com,
        dmatlack@...gle.com
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Vipin Sharma <vipinsh@...gle.com>
Subject: [Patch v4 08/13] KVM: x86: hyper-v: Use common code for hypercall
 userspace exit

Remove duplicate code to exit to userspace for hyper-v hypercalls and
use a common place to exit.

No functional change intended.

Signed-off-by: Vipin Sharma <vipinsh@...gle.com>
Suggested-by: Sean Christopherson <seanjc@...gle.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@...hat.com>

---
 arch/x86/kvm/hyperv.c | 27 +++++++++++----------------
 1 file changed, 11 insertions(+), 16 deletions(-)

diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index 283b6d179dbe..2eb68533d188 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -2521,14 +2521,7 @@ int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
 			ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
 			break;
 		}
-		vcpu->run->exit_reason = KVM_EXIT_HYPERV;
-		vcpu->run->hyperv.type = KVM_EXIT_HYPERV_HCALL;
-		vcpu->run->hyperv.u.hcall.input = hc.param;
-		vcpu->run->hyperv.u.hcall.params[0] = hc.ingpa;
-		vcpu->run->hyperv.u.hcall.params[1] = hc.outgpa;
-		vcpu->arch.complete_userspace_io =
-				kvm_hv_hypercall_complete_userspace;
-		return 0;
+		goto hypercall_userspace_exit;
 	case HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST:
 		if (unlikely(hc.var_cnt)) {
 			ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
@@ -2587,14 +2580,7 @@ int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
 			ret = HV_STATUS_OPERATION_DENIED;
 			break;
 		}
-		vcpu->run->exit_reason = KVM_EXIT_HYPERV;
-		vcpu->run->hyperv.type = KVM_EXIT_HYPERV_HCALL;
-		vcpu->run->hyperv.u.hcall.input = hc.param;
-		vcpu->run->hyperv.u.hcall.params[0] = hc.ingpa;
-		vcpu->run->hyperv.u.hcall.params[1] = hc.outgpa;
-		vcpu->arch.complete_userspace_io =
-				kvm_hv_hypercall_complete_userspace;
-		return 0;
+		goto hypercall_userspace_exit;
 	}
 	default:
 		ret = HV_STATUS_INVALID_HYPERCALL_CODE;
@@ -2603,6 +2589,15 @@ int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
 
 hypercall_complete:
 	return kvm_hv_hypercall_complete(vcpu, ret);
+
+hypercall_userspace_exit:
+	vcpu->run->exit_reason = KVM_EXIT_HYPERV;
+	vcpu->run->hyperv.type = KVM_EXIT_HYPERV_HCALL;
+	vcpu->run->hyperv.u.hcall.input = hc.param;
+	vcpu->run->hyperv.u.hcall.params[0] = hc.ingpa;
+	vcpu->run->hyperv.u.hcall.params[1] = hc.outgpa;
+	vcpu->arch.complete_userspace_io = kvm_hv_hypercall_complete_userspace;
+	return 0;
 }
 
 void kvm_hv_init_vm(struct kvm *kvm)
-- 
2.39.0.rc1.256.g54fd8350bd-goog