From: Farhan Ali <alifm@linux.ibm.com>
Subject: KVM: s390: vsie: allow CRYCB FORMAT-0
Patch-mainline: v4.20-rc1
Git-commit: 6ee74098201b717696388cd9754d10a109346d6b
References: FATE#326370, LTC#169186, bsc#1113483
Summary: kernel: AP Crypto Passthrough
Description: This adds support for AP crypto passthrough for
kvm guests.
Upstream-Description:
KVM: s390: vsie: allow CRYCB FORMAT-0
When the host and the guest both use a FORMAT-0 CRYCB,
we copy the guest's FORMAT-0 APCB to a shadow CRYCB
for use by vSIE.
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
Message-Id: <20180925231641.4954-21-akrowiak@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Farhan Ali <alifm@linux.ibm.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
arch/s390/kvm/vsie.c | 20 +++++++++++++++++---
1 file changed, 17 insertions(+), 3 deletions(-)
--- a/arch/s390/kvm/vsie.c
+++ b/arch/s390/kvm/vsie.c
@@ -126,7 +126,15 @@ static int prepare_cpuflags(struct kvm_v
return 0;
}
-/* Copy to APCB FORMAT0 from APCB FORMAT0 */
+/**
+ * setup_apcb00 - Copy to APCB FORMAT0 from APCB FORMAT0
+ * @vcpu: pointer to the virtual CPU
+ * @apcb_s: pointer to start of apcb in the shadow crycb
+ * @apcb_o: pointer to start of original apcb in the guest2
+ * @apcb_h: pointer to start of apcb in the guest1
+ *
+ * Returns 0 and -EFAULT on error reading guest apcb
+ */
static int setup_apcb00(struct kvm_vcpu *vcpu, unsigned long *apcb_s,
unsigned long apcb_o, unsigned long *apcb_h)
{
@@ -199,6 +207,14 @@ static int setup_apcb(struct kvm_vcpu *v
return setup_apcb00(vcpu, (unsigned long *) &crycb_s->apcb0,
(unsigned long) &crycb->apcb0,
(unsigned long *) &crycb_h->apcb0);
+ case CRYCB_FORMAT0:
+ if ((crycb_o & PAGE_MASK) != ((crycb_o + 32) & PAGE_MASK))
+ return -EACCES;
+ if (fmt_h != CRYCB_FORMAT0)
+ return -EINVAL;
+ return setup_apcb00(vcpu, (unsigned long *) &crycb_s->apcb0,
+ (unsigned long) &crycb->apcb0,
+ (unsigned long *) &crycb_h->apcb0);
}
return -EINVAL;
}
@@ -238,8 +254,6 @@ static int shadow_crycb(struct kvm_vcpu
int ret = 0;
scb_s->crycbd = 0;
- if (!(crycbd_o & vcpu->arch.sie_block->crycbd & CRYCB_FORMAT1))
- return 0;
apie_h = vcpu->arch.sie_block->eca & ECA_APIE;
if (!apie_h && !key_msk)