linux-kernel - [PATCH v4 1/4] KVM: SVM: Set sev->asid in sev_asid

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Message-ID: <20240131235609.4161407-2-seanjc@google.com>
Date: Wed, 31 Jan 2024 15:56:06 -0800
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Ashish Kalra <ashish.kalra@....com>, Tom Lendacky <thomas.lendacky@....com>
Subject: [PATCH v4 1/4] KVM: SVM: Set sev->asid in sev_asid_new() instead of
 overloading the return

Explicitly set sev->asid in sev_asid_new() when a new ASID is successfully
allocated, and return '0' to indicate success instead of overloading the
return value to multiplex the ASID with error codes.  There is exactly one
caller of sev_asid_new(), and sev_asid_free() already consumes sev->asid,
i.e. returning the ASID isn't necessary for flexibility, nor does it
provide symmetry between related APIs.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/kvm/svm/sev.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index f760106c31f8..7c000088bca6 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -179,7 +179,8 @@ static int sev_asid_new(struct kvm_sev_info *sev)
 
 	mutex_unlock(&sev_bitmap_lock);
 
-	return asid;
+	sev->asid = asid;
+	return 0;
 e_uncharge:
 	sev_misc_cg_uncharge(sev);
 	put_misc_cg(sev->misc_cg);
@@ -246,7 +247,7 @@ static void sev_unbind_asid(struct kvm *kvm, unsigned int handle)
 static int sev_guest_init(struct kvm *kvm, struct kvm_sev_cmd *argp)
 {
 	struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
-	int asid, ret;
+	int ret;
 
 	if (kvm->created_vcpus)
 		return -EINVAL;
@@ -257,10 +258,9 @@ static int sev_guest_init(struct kvm *kvm, struct kvm_sev_cmd *argp)
 
 	sev->active = true;
 	sev->es_active = argp->id == KVM_SEV_ES_INIT;
-	asid = sev_asid_new(sev);
-	if (asid < 0)
+	ret = sev_asid_new(sev);
+	if (ret)
 		goto e_no_asid;
-	sev->asid = asid;
 
 	ret = sev_platform_init(&argp->error);
 	if (ret)
-- 
2.43.0.429.g432eaa2c6b-goog