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| author | Fan Zhang <zhangfan@linux.vnet.ibm.com> | 2016-11-29 07:17:55 +0100 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2017-03-22 18:59:33 +0100 |
| commit | 4e0b1ab72b8af961bcaca9ec1475279c1cd9579c (patch) | |
| tree | 4d4d05d417d222e02dba5c82955bf0eb1c19313d /arch/s390/kvm/priv.c | |
| parent | 7c2b3e0ddc063f61a201ccb70a121fecc8373a49 (diff) | |
| download | linux-4e0b1ab72b8af961bcaca9ec1475279c1cd9579c.tar.bz2 | |
KVM: s390: gs support for kvm guests
This patch adds guarded storage support for KVM guest. We need to
setup the necessary control blocks, the kvm_run structure for the
new registers, the necessary wrappers for VSIE, as well as the
machine check save areas.
GS is enabled lazily and the register saving and reloading is done in
KVM code. As this feature adds new content for migration, we provide
a new capability for enablement (KVM_CAP_S390_GS).
Signed-off-by: Fan Zhang <zhangfan@linux.vnet.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390/kvm/priv.c')
| -rw-r--r-- | arch/s390/kvm/priv.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c index d42bb2d03041..0ffe973535fa 100644 --- a/arch/s390/kvm/priv.c +++ b/arch/s390/kvm/priv.c @@ -53,6 +53,33 @@ int kvm_s390_handle_aa(struct kvm_vcpu *vcpu) return -EOPNOTSUPP; } +static int handle_gs(struct kvm_vcpu *vcpu) +{ + if (test_kvm_facility(vcpu->kvm, 133)) { + VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (lazy)"); + preempt_disable(); + __ctl_set_bit(2, 4); + current->thread.gs_cb = (struct gs_cb *)&vcpu->run->s.regs.gscb; + restore_gs_cb(current->thread.gs_cb); + preempt_enable(); + vcpu->arch.sie_block->ecb |= ECB_GS; + vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT; + vcpu->arch.gs_enabled = 1; + kvm_s390_retry_instr(vcpu); + return 0; + } else + return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); +} + +int kvm_s390_handle_e3(struct kvm_vcpu *vcpu) +{ + int code = vcpu->arch.sie_block->ipb & 0xff; + + if (code == 0x49 || code == 0x4d) + return handle_gs(vcpu); + else + return -EOPNOTSUPP; +} /* Handle SCK (SET CLOCK) interception */ static int handle_set_clock(struct kvm_vcpu *vcpu) { |