KVM: s390: protvirt: Handle SE notification interceptions

Since there is no interception for load control and load psw
instruction in the protected mode, we need a new way to get notified
whenever we can inject an IRQ right after the guest has just enabled
the possibility for receiving them.

The new interception codes solve that problem by providing a
notification for changes to IRQ enablement relevant bits in CRs 0, 6
and 14, as well a the machine check mask bit in the PSW.

No special handling is needed for these interception codes, the KVM
pre-run code will consult all necessary CRs and PSW bits and inject
IRQs the guest is enabled for.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
[borntraeger@de.ibm.com: patch merging, splitting, fixing]
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index 1aa2382fe363de8e0d32339d5ffb83820062ff45..fdc6ceff639703eeff81ac7b60c133a1a9e78588 100644 (file)
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -215,6 +215,8 @@ struct kvm_s390_sie_block {
 #define ICPT_PARTEXEC  0x38
 #define ICPT_IOINST    0x40
 #define ICPT_KSS       0x5c
+#define ICPT_MCHKREQ   0x60
+#define ICPT_INT_ENABLE        0x64
        __u8    icptcode;               /* 0x0050 */
        __u8    icptstatus;             /* 0x0051 */
        __u16   ihcpu;                  /* 0x0052 */

diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c
index a389fa85cca2d4bcb2ff6f715ffd5ffe682eb965..9090f29ae8222c3b2c804a629268c1fea3bdaaf3 100644 (file)
--- a/arch/s390/kvm/intercept.c
+++ b/arch/s390/kvm/intercept.c
@@ -2,7 +2,7 @@
 /*
  * in-kernel handling for sie intercepts
  *
- * Copyright IBM Corp. 2008, 2014
+ * Copyright IBM Corp. 2008, 2020
  *
  *    Author(s): Carsten Otte <cotte@de.ibm.com>
  *               Christian Borntraeger <borntraeger@de.ibm.com>
@@ -480,6 +480,15 @@ int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
        case ICPT_KSS:
                rc = kvm_s390_skey_check_enable(vcpu);
                break;
+       case ICPT_MCHKREQ:
+       case ICPT_INT_ENABLE:
+               /*
+                * PSW bit 13 or a CR (0, 6, 14) changed and we might
+                * now be able to deliver interrupts. The pre-run code
+                * will take care of this.
+                */
+               rc = 0;
+               break;
        default:
                return -EOPNOTSUPP;
        }