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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>
hifive-unleashed-5.1
Pierre Morel 2018-09-25 19:16:35 -04:00 committed by Christian Borntraeger
parent 19fd83a647
commit 6ee7409820
1 changed files with 17 additions and 3 deletions
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20
arch/s390/kvm/vsie.c
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@ -136,7 +136,15 @@ static int prepare_cpuflags(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
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)
{
@ -209,6 +217,14 @@ static int setup_apcb(struct kvm_vcpu *vcpu, struct kvm_s390_crypto_cb *crycb_s,
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;
}
@ -248,8 +264,6 @@ static int shadow_crycb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
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)