linux-kernel - [PATCH 3/6] KVM: SEV: use mutex guard in sev_mem_enc_register

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Message-ID: <20251219114238.3797364-4-clopez@suse.de>
Date: Fri, 19 Dec 2025 12:41:58 +0100
From: Carlos López <clopez@...e.de>
To: kvm@...r.kernel.org,
	seanjc@...gle.com,
	pbonzini@...hat.com
Cc: tglx@...utronix.de,
	mingo@...hat.com,
	bp@...en8.de,
	dave.hansen@...ux.intel.com,
	x86@...nel.org,
	hpa@...or.com,
	linux-kernel@...r.kernel.org,
	Carlos López <clopez@...e.de>
Subject: [PATCH 3/6] KVM: SEV: use mutex guard in sev_mem_enc_register_region()

Simplify the error paths in sev_mem_enc_register_region() by using a
mutex guard, allowing early return instead of using a goto.

Signed-off-by: Carlos López <clopez@...e.de>
---
 arch/x86/kvm/svm/sev.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index 0ee1b77aeec5..253f2ae24bfc 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -2691,13 +2691,13 @@ int sev_mem_enc_register_region(struct kvm *kvm,
 	if (!region)
 		return -ENOMEM;
 
-	mutex_lock(&kvm->lock);
+	guard(mutex)(&kvm->lock);
 	region->pages = sev_pin_memory(kvm, range->addr, range->size, &region->npages,
 				       FOLL_WRITE | FOLL_LONGTERM);
 	if (IS_ERR(region->pages)) {
 		ret = PTR_ERR(region->pages);
-		mutex_unlock(&kvm->lock);
-		goto e_free;
+		kfree(region);
+		return ret;
 	}
 
 	/*
@@ -2714,13 +2714,8 @@ int sev_mem_enc_register_region(struct kvm *kvm,
 	region->size = range->size;
 
 	list_add_tail(&region->list, &sev->regions_list);
-	mutex_unlock(&kvm->lock);
 
 	return ret;
-
-e_free:
-	kfree(region);
-	return ret;
 }
 
 static struct enc_region *
-- 
2.51.0