linux-kernel - [PATCH v2 3/5] KVM: s390: vsie: Allow support for a host without AP

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Message-Id: <1534956717-14087-4-git-send-email-pmorel@linux.ibm.com>
Date:   Wed, 22 Aug 2018 18:51:55 +0200
From:   Pierre Morel <pmorel@...ux.ibm.com>
To:     david@...hat.com
Cc:     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,
        borntraeger@...ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com
Subject: [PATCH v2 3/5] KVM: s390: vsie: Allow support for a host without AP

Currently the CRYCB format used in the host for the
shadowed CRYCB is FORMAT2 while no check is done if
AP instructions are supported in the host.

We better use the format the host calculated for the
guest 1 as the host already tested it against its
facility set.

Signed-off-by: Pierre Morel <pmorel@...ux.ibm.com>
---
 arch/s390/kvm/vsie.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c
index 56a9d47..0b12916 100644
--- a/arch/s390/kvm/vsie.c
+++ b/arch/s390/kvm/vsie.c
@@ -154,6 +154,7 @@ static int shadow_crycb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
 	const u32 crycb_addr = crycbd_o & 0x7ffffff8U;
 	unsigned long *b1, *b2;
 	u8 ecb3_flags;
+	unsigned long g1_fmt;
 
 	scb_s->crycbd = 0;
 	if (!(crycbd_o == CRYCB_FORMAT1))
@@ -180,8 +181,8 @@ static int shadow_crycb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
 		return set_validity_icpt(scb_s, 0x0035U);
 
 	scb_s->ecb3 |= ecb3_flags;
-	scb_s->crycbd = ((__u32)(__u64) &vsie_page->crycb) | CRYCB_FORMAT1 |
-			CRYCB_FORMAT2;
+	g1_fmt = vcpu->arch.sie_block->crycbd & 0x03;
+	scb_s->crycbd = ((__u32)(__u64) &vsie_page->crycb) | g1_fmt;
 
 	/* xor both blocks in one run */
 	b1 = (unsigned long *) vsie_page->crycb.dea_wrapping_key_mask;
-- 
2.7.4