linux-kernel - [PATCH 4.19 38/50] KVM: SEV: fix double locking due to incorrect backport

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Date:   Mon, 22 Feb 2021 13:13:29 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dov Murik <dovmurik@...ux.vnet.ibm.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 38/50] KVM: SEV: fix double locking due to incorrect backport

From: Paolo Bonzini <pbonzini@...hat.com>

Fix an incorrect line in the 5.4.y and 4.19.y backports of commit
19a23da53932bc ("Fix unsynchronized access to sev members through
svm_register_enc_region"), first applied to 5.4.98 and 4.19.176.

Fixes: 1e80fdc09d12 ("KVM: SVM: Pin guest memory when SEV is active")
Reported-by: Dov Murik <dovmurik@...ux.vnet.ibm.com>
Cc: stable@...r.kernel.org # 5.4.x
Cc: stable@...r.kernel.org # 4.19.x
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/x86/kvm/svm.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index b34d11f22213f..8cb9277aa6ff2 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -7097,7 +7097,6 @@ static int svm_register_enc_region(struct kvm *kvm,
 	region->uaddr = range->addr;
 	region->size = range->size;
 
-	mutex_lock(&kvm->lock);
 	list_add_tail(&region->list, &sev->regions_list);
 	mutex_unlock(&kvm->lock);
 
-- 
2.27.0