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KVM: s390: Support Configuration z/Architecture Mode 

kvm has always supported the concept of starting in z/Arch mode so let's
reflect the feature bit to the guest.

Also, we change sigp set architecture to reject any request to change
architecture modes.

Signed-off-by: Jason J. Herne <jjherne@linux.vnet.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Jason J. Herne 2017-02-24 10:01:30 -05:00 committed by Christian Borntraeger
parent ccc59f47b6
commit b697e435ae
2 changed files with 18 additions and 19 deletions
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36
arch/s390/kvm/sigp.c
View File

@ -155,29 +155,26 @@ static int __sigp_stop_and_store_status(struct kvm_vcpu *vcpu,
return rc;
}
static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter,
u64 *status_reg)
{
int rc;
unsigned int i;
struct kvm_vcpu *v;
bool all_stopped = true;
switch (parameter & 0xff) {
case 0:
rc = SIGP_CC_NOT_OPERATIONAL;
break;
case 1:
case 2:
kvm_for_each_vcpu(i, v, vcpu->kvm) {
v->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
kvm_clear_async_pf_completion_queue(v);
}
rc = SIGP_CC_ORDER_CODE_ACCEPTED;
break;
default:
rc = -EOPNOTSUPP;
kvm_for_each_vcpu(i, v, vcpu->kvm) {
if (v == vcpu)
continue;
if (!is_vcpu_stopped(v))
all_stopped = false;
}
return rc;
*status_reg &= 0xffffffff00000000UL;
/* Reject set arch order, with czam we're always in z/Arch mode. */
*status_reg |= (all_stopped ? SIGP_STATUS_INVALID_PARAMETER :
SIGP_STATUS_INCORRECT_STATE);
return SIGP_CC_STATUS_STORED;
}
static int __sigp_set_prefix(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu,
@ -446,7 +443,8 @@ int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
switch (order_code) {
case SIGP_SET_ARCHITECTURE:
vcpu->stat.instruction_sigp_arch++;
rc = __sigp_set_arch(vcpu, parameter);
rc = __sigp_set_arch(vcpu, parameter,
&vcpu->run->s.regs.gprs[r1]);
break;
default:
rc = handle_sigp_dst(vcpu, order_code, cpu_addr,

1
arch/s390/tools/gen_facilities.c
View File

@ -80,6 +80,7 @@ static struct facility_def facility_defs[] = {
78, /* enhanced-DAT 2 */
130, /* instruction-execution-protection */
131, /* enhanced-SOP 2 and side-effect */
138, /* configuration z/architecture mode (czam) */
146, /* msa extension 8 */
-1 /* END */
}