From: Jason J. Herne <jjherne@linux.vnet.ibm.com>
Subject: KVM: s390: Support Configuration z/Architecture Mode
Patch-mainline: v4.14-rc1
Git-commit: b697e435aeee99b7f5b2d8f8dbb51f791be99b16
References: FATE#324111, LTC#158961,bsc#1066434
Summary: kvm-kernel: VS1606 zMidas cpu model checking backport
Description: Provide cpu model support for msa 6/7/8
Upstream-Description:
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>
Signed-off-by: Jason J. Herne <jjherne@linux.vnet.ibm.com>
Acked-by: Hannes Reinecke <hare@suse.com>
---
arch/s390/kvm/sigp.c | 36 +++++++++++++++++-------------------
arch/s390/tools/gen_facilities.c | 1 +
2 files changed, 18 insertions(+), 19 deletions(-)
--- a/arch/s390/kvm/sigp.c
+++ b/arch/s390/kvm/sigp.c
@@ -155,29 +155,26 @@ static int __sigp_stop_and_store_status(
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
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,
--- a/arch/s390/tools/gen_facilities.c
+++ b/arch/s390/tools/gen_facilities.c
@@ -82,6 +82,7 @@ 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 */
}