linux-kernel - [PATCH v2] s390: vsie: Use effective CRYCBD.31 to check CRYCBD validity

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Date:   Mon, 11 Feb 2019 10:20:49 +0100
From:   Pierre Morel <pmorel@...ux.ibm.com>
To:     borntraeger@...ibm.com
Cc:     david@...hat.com, linux-kernel@...r.kernel.org, cohuck@...hat.com,
        linux-s390@...r.kernel.org, kvm@...r.kernel.org,
        frankja@...ux.ibm.com, akrowiak@...ux.ibm.com, pasic@...ux.ibm.com
Subject: [PATCH v2] s390: vsie: Use effective CRYCBD.31 to check CRYCBD validity

When facility.76 MSAX3 is present for the guest we must issue a validity
interception if the CRYCBD is not valid.

The bit CRYCBD.31 is an effective field and tested at each guest
level and has for effect to mask the facility.76

It follows that if CRYCBD.31 is clear and AP is not in use  we do not
have to test the CRYCBD validatity even facility.76 is present in the
host.

Fixes: 6ee74098201b ("KVM: s390: vsie: allow CRYCB FORMAT-0")
Cc: stable@...r.kernel.org

Signed-off-by: Pierre Morel <pmorel@...ux.ibm.com>
Reported-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>
Acked-by: David Hildenbrand <david@...hat.com>
---
 arch/s390/kvm/vsie.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c
index a153257..d62fa14 100644
--- a/arch/s390/kvm/vsie.c
+++ b/arch/s390/kvm/vsie.c
@@ -297,7 +297,7 @@ static int shadow_crycb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
 	scb_s->crycbd = 0;
 
 	apie_h = vcpu->arch.sie_block->eca & ECA_APIE;
-	if (!apie_h && !key_msk)
+	if (!apie_h && (!key_msk || fmt_o == CRYCB_FORMAT0))
 		return 0;
 
 	if (!crycb_addr)
-- 
2.7.4