linux-kernel - [PATCH 1/1] KVM: s390: vsie: fix the length of APCB bitmap

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Message-Id: <20230511094719.9691-2-pmorel@linux.ibm.com>
Date:   Thu, 11 May 2023 11:47:19 +0200
From:   Pierre Morel <pmorel@...ux.ibm.com>
To:     david@...hat.com
Cc:     kvm@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, borntraeger@...ibm.com,
        frankja@...ux.ibm.com, cohuck@...hat.com, thuth@...hat.com,
        imbrenda@...ux.ibm.com, hca@...ux.ibm.com, gor@...ux.ibm.com,
        svens@...ux.ibm.com
Subject: [PATCH 1/1] KVM: s390: vsie: fix the length of APCB bitmap

bit_and() uses the count of bits as the woking length.
Fix the previous implementation and effectively use
the right bitmap size.

Fixes: 19fd83a64718 ("KVM: s390: vsie: allow CRYCB FORMAT-1")
Fixes: 56019f9aca22 ("KVM: s390: vsie: Allow CRYCB FORMAT-2")

Signed-off-by: Pierre Morel <pmorel@...ux.ibm.com>
---
 arch/s390/kvm/vsie.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c
index 8d6b765abf29..0333ee482eb8 100644
--- a/arch/s390/kvm/vsie.c
+++ b/arch/s390/kvm/vsie.c
@@ -177,7 +177,8 @@ static int setup_apcb00(struct kvm_vcpu *vcpu, unsigned long *apcb_s,
 			    sizeof(struct kvm_s390_apcb0)))
 		return -EFAULT;
 
-	bitmap_and(apcb_s, apcb_s, apcb_h, sizeof(struct kvm_s390_apcb0));
+	bitmap_and(apcb_s, apcb_s, apcb_h,
+		   BITS_PER_BYTE * sizeof(struct kvm_s390_apcb0));
 
 	return 0;
 }
@@ -203,7 +204,8 @@ static int setup_apcb11(struct kvm_vcpu *vcpu, unsigned long *apcb_s,
 			    sizeof(struct kvm_s390_apcb1)))
 		return -EFAULT;
 
-	bitmap_and(apcb_s, apcb_s, apcb_h, sizeof(struct kvm_s390_apcb1));
+	bitmap_and(apcb_s, apcb_s, apcb_h,
+		   BITS_PER_BYTE * sizeof(struct kvm_s390_apcb1));
 
 	return 0;
 }
-- 
2.31.1