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KVM: s390: protvirt: Instruction emulation

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We have two new SIE exit codes dealing with instructions.
104 (0x68) for a secure instruction interception, on which the SIE needs
hypervisor action to complete the instruction. We can piggy-back on the
existing instruction handlers.

108 which is merely a notification and provides data for tracking and
management. For example this is used to tell the host about a new value
for the prefix register. As there will be several special case handlers
in later patches, we handle this in a separate function.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
[borntraeger@de.ibm.com: patch merging, splitting, fixing]
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Janosch Frank 2019-10-22 04:42:52 -04:00 committed by Christian Borntraeger
parent 49710db081
commit da24a0cc58
2 changed files with 13 additions and 0 deletions
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2
arch/s390/include/asm/kvm_host.h
View file

@ -217,6 +217,8 @@ struct kvm_s390_sie_block {
#define ICPT_KSS 0x5c
#define ICPT_MCHKREQ 0x60
#define ICPT_INT_ENABLE 0x64
#define ICPT_PV_INSTR 0x68
#define ICPT_PV_NOTIFY 0x6c
__u8 icptcode; /* 0x0050 */
__u8 icptstatus; /* 0x0051 */
__u16 ihcpu; /* 0x0052 */

11
arch/s390/kvm/intercept.c
View file

@ -444,6 +444,11 @@ static int handle_operexc(struct kvm_vcpu *vcpu)
return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
}
static int handle_pv_notification(struct kvm_vcpu *vcpu)
{
return handle_instruction(vcpu);
}
int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
{
int rc, per_rc = 0;
@ -489,6 +494,12 @@ int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
*/
rc = 0;
break;
case ICPT_PV_INSTR:
rc = handle_instruction(vcpu);
break;
case ICPT_PV_NOTIFY:
rc = handle_pv_notification(vcpu);
break;
default:
return -EOPNOTSUPP;
}