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| author | Farhan Ali <alifm@linux.vnet.ibm.com> | 2017-02-24 22:12:56 +0100 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2017-04-21 11:08:11 +0200 |
| commit | 730cd632c4e485b90f97fe998e300045da094938 (patch) | |
| tree | 894c8643cbfbaa47b6973cd34a3e054840513e47 /arch/s390/kvm/vsie.c | |
| parent | s390/sclp: Detect KSS facility (diff) | |
| download | linux-730cd632c4e485b90f97fe998e300045da094938.tar.xz linux-730cd632c4e485b90f97fe998e300045da094938.zip | |
KVM: s390: Support keyless subset guest mode
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>
Diffstat (limited to 'arch/s390/kvm/vsie.c')
| -rw-r--r-- | arch/s390/kvm/vsie.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c index 025b1f2e17a9..4719ecb9ab42 100644 --- a/arch/s390/kvm/vsie.c +++ b/arch/s390/kvm/vsie.c @@ -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)) |