s390x fixes and cleanups; also related fixes in xtensa,

arm, and x86 code
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Merge remote-tracking branch 'remotes/cohuck-gitlab/tags/s390x-20210520-v2' into staging

s390x fixes and cleanups; also related fixes in xtensa,
arm, and x86 code

# gpg: Signature made Thu 20 May 2021 13:23:15 BST
# gpg:                using RSA key C3D0D66DC3624FF6A8C018CEDECF6B93C6F02FAF
# gpg:                issuer "cohuck@redhat.com"
# gpg: Good signature from "Cornelia Huck <conny@cornelia-huck.de>" [unknown]
# gpg:                 aka "Cornelia Huck <huckc@linux.vnet.ibm.com>" [full]
# gpg:                 aka "Cornelia Huck <cornelia.huck@de.ibm.com>" [full]
# gpg:                 aka "Cornelia Huck <cohuck@kernel.org>" [unknown]
# gpg:                 aka "Cornelia Huck <cohuck@redhat.com>" [unknown]
# Primary key fingerprint: C3D0 D66D C362 4FF6 A8C0  18CE DECF 6B93 C6F0 2FAF

* remotes/cohuck-gitlab/tags/s390x-20210520-v2:
  tests/tcg/x86_64: add vsyscall smoke test
  target/i386: Make sure that vsyscall's tb->size != 0
  vfio-ccw: Attempt to clean up all IRQs on error
  hw/s390x/ccw: Register qbus type in abstract TYPE_CCW_DEVICE parent
  vfio-ccw: Permit missing IRQs
  accel/tcg: Assert that tb->size != 0 after translation
  target/xtensa: Make sure that tb->size != 0
  target/arm: Make sure that commpage's tb->size != 0
  target/s390x: Fix translation exception on illegal instruction

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

accel/tcg/translate-all.c

@@ -1912,6 +1912,7 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
 
     tcg_ctx->cpu = env_cpu(env);
     gen_intermediate_code(cpu, tb, max_insns);
+    assert(tb->size != 0);
     tcg_ctx->cpu = NULL;
     max_insns = tb->icount;
 

hw/s390x/3270-ccw.c

@@ -158,7 +158,6 @@ static void emulated_ccw_3270_class_init(ObjectClass *klass, void *data)
     DeviceClass *dc = DEVICE_CLASS(klass);
 
     device_class_set_props(dc, emulated_ccw_3270_properties);
-    dc->bus_type = TYPE_VIRTUAL_CSS_BUS;
     dc->realize = emulated_ccw_3270_realize;
     dc->hotpluggable = false;
     set_bit(DEVICE_CATEGORY_DISPLAY, dc->categories);

hw/s390x/ccw-device.c

@@ -59,6 +59,7 @@ static void ccw_device_class_init(ObjectClass *klass, void *data)
     k->refill_ids = ccw_device_refill_ids;
     device_class_set_props(dc, ccw_device_properties);
     dc->reset = ccw_device_reset;
+    dc->bus_type = TYPE_VIRTUAL_CSS_BUS;
 }
 
 const VMStateDescription vmstate_ccw_dev = {

hw/s390x/ccw-device.h

@@ -14,6 +14,7 @@
 #include "qom/object.h"
 #include "hw/qdev-core.h"
 #include "hw/s390x/css.h"
+#include "hw/s390x/css-bridge.h"
 
 struct CcwDevice {
     DeviceState parent_obj;

hw/s390x/s390-ccw.c

@@ -176,10 +176,8 @@ static void s390_ccw_instance_init(Object *obj)
 
 static void s390_ccw_class_init(ObjectClass *klass, void *data)
 {
-    DeviceClass *dc = DEVICE_CLASS(klass);
     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass);
 
-    dc->bus_type = TYPE_VIRTUAL_CSS_BUS;
     cdc->realize = s390_ccw_realize;
     cdc->unrealize = s390_ccw_unrealize;
 }

hw/s390x/virtio-ccw.c

@@ -1234,7 +1234,6 @@ static void virtio_ccw_device_class_init(ObjectClass *klass, void *data)
     k->unplug = virtio_ccw_busdev_unplug;
     dc->realize = virtio_ccw_busdev_realize;
     dc->unrealize = virtio_ccw_busdev_unrealize;
-    dc->bus_type = TYPE_VIRTUAL_CSS_BUS;
     device_class_set_parent_reset(dc, virtio_ccw_reset, &vdc->parent_reset);
 }
 

hw/vfio/ccw.c

@@ -411,8 +411,8 @@ static void vfio_ccw_register_irq_notifier(VFIOCCWDevice *vcdev,
     }
 
     if (vdev->num_irqs < irq + 1) {
-        error_setg(errp, "vfio: unexpected number of irqs %u",
+        error_setg(errp, "vfio: IRQ %u not available (number of irqs %u)",
-                   vdev->num_irqs);
+                   irq, vdev->num_irqs);
         return;
     }
 
@@ -469,7 +469,7 @@ static void vfio_ccw_unregister_irq_notifier(VFIOCCWDevice *vcdev,
 
     if (vfio_set_irq_signaling(&vcdev->vdev, irq, 0,
                                VFIO_IRQ_SET_ACTION_TRIGGER, -1, &err)) {
-        error_reportf_err(err, VFIO_MSG_PREFIX, vcdev->vdev.name);
+        warn_reportf_err(err, VFIO_MSG_PREFIX, vcdev->vdev.name);
     }
 
     qemu_set_fd_handler(event_notifier_get_fd(notifier),
@@ -689,20 +689,24 @@ static void vfio_ccw_realize(DeviceState *dev, Error **errp)
     if (vcdev->crw_region) {
         vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_CRW_IRQ_INDEX, &err);
         if (err) {
-            goto out_crw_notifier_err;
+            goto out_irq_notifier_err;
         }
     }
 
     vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_REQ_IRQ_INDEX, &err);
     if (err) {
-        goto out_req_notifier_err;
+        /*
+         * Report this error, but do not make it a failing condition.
+         * Lack of this IRQ in the host does not prevent normal operation.
+         */
+        error_report_err(err);
     }
 
     return;
 
-out_req_notifier_err:
+out_irq_notifier_err:
+    vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_REQ_IRQ_INDEX);
     vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_CRW_IRQ_INDEX);
-out_crw_notifier_err:
     vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX);
 out_io_notifier_err:
     vfio_ccw_put_region(vcdev);

target/arm/translate.c

@@ -8981,6 +8981,7 @@ static void arm_tr_translate_insn(DisasContextBase *dcbase, CPUState *cpu)
     unsigned int insn;
 
     if (arm_pre_translate_insn(dc)) {
+        dc->base.pc_next += 4;
         return;
     }
 
@@ -9050,6 +9051,7 @@ static void thumb_tr_translate_insn(DisasContextBase *dcbase, CPUState *cpu)
     bool is_16bit;
 
     if (arm_pre_translate_insn(dc)) {
+        dc->base.pc_next += 2;
         return;
     }
 

target/i386/tcg/translate.c

@@ -8628,6 +8628,7 @@ static void i386_tr_translate_insn(DisasContextBase *dcbase, CPUState *cpu)
      */
     if ((dc->base.pc_next & TARGET_PAGE_MASK) == TARGET_VSYSCALL_PAGE) {
         gen_exception(dc, EXCP_VSYSCALL, dc->base.pc_next);
+        dc->base.pc_next = dc->pc + 1;
         return;
     }
 #endif

target/s390x/translate.c

@@ -6412,7 +6412,8 @@ static DisasJumpType translate_one(CPUS390XState *env, DisasContext *s)
         qemu_log_mask(LOG_UNIMP, "unimplemented opcode 0x%02x%02x\n",
                       s->fields.op, s->fields.op2);
         gen_illegal_opcode(s);
-        return DISAS_NORETURN;
+        ret = DISAS_NORETURN;
+        goto out;
     }
 
 #ifndef CONFIG_USER_ONLY
@@ -6428,7 +6429,8 @@ static DisasJumpType translate_one(CPUS390XState *env, DisasContext *s)
         /* privileged instruction */
         if ((s->base.tb->flags & FLAG_MASK_PSTATE) && (insn->flags & IF_PRIV)) {
             gen_program_exception(s, PGM_PRIVILEGED);
-            return DISAS_NORETURN;
+            ret = DISAS_NORETURN;
+            goto out;
         }
 
         /* if AFP is not enabled, instructions and registers are forbidden */
@@ -6455,7 +6457,8 @@ static DisasJumpType translate_one(CPUS390XState *env, DisasContext *s)
             }
             if (dxc) {
                 gen_data_exception(dxc);
-                return DISAS_NORETURN;
+                ret = DISAS_NORETURN;
+                goto out;
             }
         }
 
@@ -6463,7 +6466,8 @@ static DisasJumpType translate_one(CPUS390XState *env, DisasContext *s)
         if (insn->flags & IF_VEC) {
             if (!((s->base.tb->flags & FLAG_MASK_VECTOR))) {
                 gen_data_exception(0xfe);
-                return DISAS_NORETURN;
+                ret = DISAS_NORETURN;
+                goto out;
             }
         }
 
@@ -6484,7 +6488,8 @@ static DisasJumpType translate_one(CPUS390XState *env, DisasContext *s)
             (insn->spec & SPEC_r1_f128 && !is_fp_pair(get_field(s, r1))) ||
             (insn->spec & SPEC_r2_f128 && !is_fp_pair(get_field(s, r2)))) {
             gen_program_exception(s, PGM_SPECIFICATION);
-            return DISAS_NORETURN;
+            ret = DISAS_NORETURN;
+            goto out;
         }
     }
 
@@ -6544,6 +6549,7 @@ static DisasJumpType translate_one(CPUS390XState *env, DisasContext *s)
     }
 #endif
 
+out:
     /* Advance to the next instruction.  */
     s->base.pc_next = s->pc_tmp;
     return ret;

target/xtensa/translate.c

@@ -917,6 +917,7 @@ static void disas_xtensa_insn(CPUXtensaState *env, DisasContext *dc)
                       "unknown instruction length (pc = %08x)\n",
                       dc->pc);
         gen_exception_cause(dc, ILLEGAL_INSTRUCTION_CAUSE);
+        dc->base.pc_next = dc->pc + 1;
         return;
     }
 
@@ -1274,11 +1275,13 @@ static void xtensa_tr_translate_insn(DisasContextBase *dcbase, CPUState *cpu)
     if ((tb_cflags(dc->base.tb) & CF_USE_ICOUNT)
         && (dc->base.tb->flags & XTENSA_TBFLAG_YIELD)) {
         gen_exception(dc, EXCP_YIELD);
+        dc->base.pc_next = dc->pc + 1;
         dc->base.is_jmp = DISAS_NORETURN;
         return;
     }
     if (dc->base.tb->flags & XTENSA_TBFLAG_EXCEPTION) {
         gen_exception(dc, EXCP_DEBUG);
+        dc->base.pc_next = dc->pc + 1;
         dc->base.is_jmp = DISAS_NORETURN;
         return;
     }

tests/tcg/x86_64/Makefile.target

@@ -3,14 +3,18 @@
 # x86_64 tests - included from tests/tcg/Makefile.target
 #
 # Currently we only build test-x86_64 and test-i386-ssse3 from
-# $(SRC)/tests/tcg/i386/
+# $(SRC_PATH)/tests/tcg/i386/
 #
 
 include $(SRC_PATH)/tests/tcg/i386/Makefile.target
 
+X86_64_TESTS += vsyscall
 TESTS=$(MULTIARCH_TESTS) $(X86_64_TESTS) test-x86_64
 QEMU_OPTS += -cpu max
 
 test-x86_64: LDFLAGS+=-lm -lc
 test-x86_64: test-i386.c test-i386.h test-i386-shift.h test-i386-muldiv.h
 	$(CC) $(CFLAGS) $< -o $@ $(LDFLAGS)
+
+vsyscall: $(SRC_PATH)/tests/tcg/x86_64/vsyscall.c
+	$(CC) $(CFLAGS) $< -o $@ $(LDFLAGS)

tests/tcg/x86_64/vsyscall.c

@@ -0,0 +1,12 @@
+#include <stdio.h>
+#include <time.h>
+
+#define VSYSCALL_PAGE 0xffffffffff600000
+#define TIME_OFFSET 0x400
+typedef time_t (*time_func)(time_t *);
+
+int main(void)
+{
+    printf("%ld\n", ((time_func)(VSYSCALL_PAGE + TIME_OFFSET))(NULL));
+    return 0;
+}