[PATCH v1 03/14] s390x/s390-virtio-hcall: prepare for more diag500 hypercalls

[David Hildenbrand <david@redhat.com>]

Let's generalize, abstracting the virtio bits. diag500 is now a generic
hypercall to handle QEMU/KVM specific things. Explicitly specify all
already defined subcodes, including legacy ones (so we know what we can
use for new hypercalls).

We'll rename the files separately, so git properly detects the rename.

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 hw/s390x/s390-virtio-hcall.c   |  8 ++++----
 hw/s390x/s390-virtio-hcall.h   | 11 ++++++-----
 target/s390x/kvm/kvm.c         | 10 ++--------
 target/s390x/tcg/misc_helper.c |  4 ++--
 4 files changed, 14 insertions(+), 19 deletions(-)

diff --git a/hw/s390x/s390-virtio-hcall.c b/hw/s390x/s390-virtio-hcall.c
index ca49e3cd22..4cddf69fbb 100644
--- a/hw/s390x/s390-virtio-hcall.c
+++ b/hw/s390x/s390-virtio-hcall.c
@@ -1,5 +1,5 @@
 /*
- * Support for virtio hypercalls on s390
+ * Support for QEMU/KVM hypercalls on s390
  *
  * Copyright 2012 IBM Corp.
  * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
@@ -57,15 +57,15 @@ static int handle_virtio_ccw_notify(uint64_t subch_id, uint64_t data)
     return 0;
 }
 
-int s390_virtio_hypercall(CPUS390XState *env)
+int handle_diag_500(CPUS390XState *env)
 {
     const uint64_t subcode = env->regs[1];
 
     switch (subcode) {
-    case KVM_S390_VIRTIO_NOTIFY:
+    case DIAG500_VIRTIO_NOTIFY:
         env->regs[2] = handle_virtio_notify(env->regs[2]);
         return 0;
-    case KVM_S390_VIRTIO_CCW_NOTIFY:
+    case DIAG500_VIRTIO_CCW_NOTIFY:
         env->regs[2] = handle_virtio_ccw_notify(env->regs[2], env->regs[3]);
         return 0;
     default:
diff --git a/hw/s390x/s390-virtio-hcall.h b/hw/s390x/s390-virtio-hcall.h
index 3d9fe147d2..e4f76aca82 100644
--- a/hw/s390x/s390-virtio-hcall.h
+++ b/hw/s390x/s390-virtio-hcall.h
@@ -1,5 +1,5 @@
 /*
- * Support for virtio hypercalls on s390x
+ * Support for QEMU/KVM hypercalls on s390x
  *
  * Copyright IBM Corp. 2012, 2017
  * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
@@ -12,12 +12,13 @@
 #ifndef HW_S390_VIRTIO_HCALL_H
 #define HW_S390_VIRTIO_HCALL_H
 
-#include "standard-headers/asm-s390/virtio-ccw.h"
 #include "cpu.h"
 
-/* The only thing that we need from the old kvm_virtio.h file */
-#define KVM_S390_VIRTIO_NOTIFY 0
+#define DIAG500_VIRTIO_NOTIFY           0 /* legacy, implemented as a NOP */
+#define DIAG500_VIRTIO_RESET            1 /* legacy */
+#define DIAG500_VIRTIO_SET_STATUS       2 /* legacy */
+#define DIAG500_VIRTIO_CCW_NOTIFY       3 /* KVM_S390_VIRTIO_CCW_NOTIFY */
 
-int s390_virtio_hypercall(CPUS390XState *env);
+int handle_diag_500(CPUS390XState *env);
 
 #endif /* HW_S390_VIRTIO_HCALL_H */
diff --git a/target/s390x/kvm/kvm.c b/target/s390x/kvm/kvm.c
index 94181d9281..ac292b184a 100644
--- a/target/s390x/kvm/kvm.c
+++ b/target/s390x/kvm/kvm.c
@@ -1493,16 +1493,10 @@ static int handle_e3(S390CPU *cpu, struct kvm_run *run, uint8_t ipbl)
 
 static int handle_hypercall(S390CPU *cpu, struct kvm_run *run)
 {
-    CPUS390XState *env = &cpu->env;
-    int ret;
-
-    ret = s390_virtio_hypercall(env);
-    if (ret == -EINVAL) {
+    if (handle_diag_500(&cpu->env)) {
         kvm_s390_program_interrupt(cpu, PGM_SPECIFICATION);
-        return 0;
     }
-
-    return ret;
+    return 0;
 }
 
 static void kvm_handle_diag_288(S390CPU *cpu, struct kvm_run *run)
diff --git a/target/s390x/tcg/misc_helper.c b/target/s390x/tcg/misc_helper.c
index 303f86d363..58757585a2 100644
--- a/target/s390x/tcg/misc_helper.c
+++ b/target/s390x/tcg/misc_helper.c
@@ -117,9 +117,9 @@ void HELPER(diag)(CPUS390XState *env, uint32_t r1, uint32_t r3, uint32_t num)
 
     switch (num) {
     case 0x500:
-        /* KVM hypercall */
+        /* QEMU/KVM hypercall */
         bql_lock();
-        r = s390_virtio_hypercall(env);
+        r = handle_diag_500(env);
         bql_unlock();
         break;
     case 0x44:
-- 
2.46.0