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KVM: s390: Support keyless subset guest mode

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If the KSS facility is available on the machine, we also make it
available for our KVM guests.

The KSS facility bypasses storage key management as long as the guest
does not issue a related instruction. When that happens, the control is
returned to the host, which has to turn off KSS for a guest vcpu
before retrying the instruction.

Signed-off-by: Corey S. McQuay <csmcquay@linux.vnet.ibm.com>
Signed-off-by: Farhan Ali <alifm@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Farhan Ali
2017-02-24 16:12:56 -05:00
committed by Christian Borntraeger
parent 71cb1bf66e
commit 730cd632c4
7 changed files with 32 additions and 8 deletions
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6
arch/s390/kvm/vsie.c
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@@ -117,6 +117,8 @@ static int prepare_cpuflags(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
newflags |= cpuflags & CPUSTAT_SM;
if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_IBS))
newflags |= cpuflags & CPUSTAT_IBS;
if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_KSS))
newflags |= cpuflags & CPUSTAT_KSS;
atomic_set(&scb_s->cpuflags, newflags);
return 0;
@@ -289,7 +291,9 @@ static int shadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
* bits. Therefore we cannot provide interpretation and would later
* have to provide own emulation handlers.
*/
scb_s->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
if (!(atomic_read(&scb_s->cpuflags) & CPUSTAT_KSS))
scb_s->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
scb_s->icpua = scb_o->icpua;
if (!(atomic_read(&scb_s->cpuflags) & CPUSTAT_SM))