Merge remote-tracking branch 'remotes/sstabellini/tags/xen-20160121' into staging

Xen 2016/01/21

# gpg: Signature made Thu 21 Jan 2016 16:58:50 GMT using RSA key ID 70E1AE90
# gpg: Good signature from "Stefano Stabellini <stefano.stabellini@eu.citrix.com>"

* remotes/sstabellini/tags/xen-20160121:
  Xen PCI passthru: convert to realize()
  Add Error **errp for xen_pt_config_init()
  Add Error **errp for xen_pt_setup_vga()
  Add Error **errp for xen_host_pci_device_get()
  Xen: use qemu_strtoul instead of strtol
  Change xen_host_pci_sysfs_path() to return void
  xen-pvdevice: convert to realize()
  xen-hvm: Clean up xen_ram_alloc() error handling
  xen-hvm: Clean up xen_hvm_init() error handling
  xenfb.c: avoid expensive loops when prod <= out_cons
  MAINTAINERS: update Xen files

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

MAINTAINERS

@@ -273,9 +273,12 @@ F: */xen*
 F: hw/char/xen_console.c
 F: hw/display/xenfb.c
 F: hw/net/xen_nic.c
+F: hw/block/xen_*
 F: hw/xen/
 F: hw/xenpv/
+F: hw/i386/xen/
 F: include/hw/xen/
+F: include/sysemu/xen-mapcache.h
 
 Hosts:
 ------

exec.c

@@ -1510,6 +1510,7 @@ static ram_addr_t ram_block_add(RAMBlock *new_block, Error **errp)
     RAMBlock *block;
     RAMBlock *last_block = NULL;
     ram_addr_t old_ram_size, new_ram_size;
+    Error *err = NULL;
 
     old_ram_size = last_ram_offset() >> TARGET_PAGE_BITS;
 
@@ -1519,7 +1520,12 @@ static ram_addr_t ram_block_add(RAMBlock *new_block, Error **errp)
     if (!new_block->host) {
         if (xen_enabled()) {
             xen_ram_alloc(new_block->offset, new_block->max_length,
-                          new_block->mr);
+                          new_block->mr, &err);
+            if (err) {
+                error_propagate(errp, err);
+                qemu_mutex_unlock_ramlist();
+                return -1;
+            }
         } else {
             new_block->host = phys_mem_alloc(new_block->max_length,
                                              &new_block->mr->align);

hw/display/xenfb.c

@@ -789,8 +789,9 @@ static void xenfb_handle_events(struct XenFB *xenfb)
 
     prod = page->out_prod;
     out_cons = page->out_cons;
-    if (prod == out_cons)
-	return;
+    if (prod - out_cons >= XENFB_OUT_RING_LEN) {
+        return;
+    }
     xen_rmb();		/* ensure we see ring contents up to prod */
     for (cons = out_cons; cons != prod; cons++) {
 	union xenfb_out_event *event = &XENFB_OUT_RING_REF(page, cons);

hw/i386/pc_piix.c

@@ -121,9 +121,8 @@ static void pc_init1(MachineState *machine,
         pcms->below_4g_mem_size = machine->ram_size;
     }
 
-    if (xen_enabled() && xen_hvm_init(pcms, &ram_memory) != 0) {
-        fprintf(stderr, "xen hardware virtual machine initialisation failed\n");
-        exit(1);
+    if (xen_enabled()) {
+        xen_hvm_init(pcms, &ram_memory);
     }
 
     pc_cpus_init(pcms);

hw/i386/pc_q35.c

@@ -111,9 +111,8 @@ static void pc_q35_init(MachineState *machine)
         pcms->below_4g_mem_size = machine->ram_size;
     }
 
-    if (xen_enabled() && xen_hvm_init(pcms, &ram_memory) != 0) {
-        fprintf(stderr, "xen hardware virtual machine initialisation failed\n");
-        exit(1);
+    if (xen_enabled()) {
+        xen_hvm_init(pcms, &ram_memory);
     }
 
     pc_cpus_init(pcms);

hw/i386/xen/xen_pvdevice.c

@@ -69,14 +69,16 @@ static const MemoryRegionOps xen_pv_mmio_ops = {
     .endianness = DEVICE_LITTLE_ENDIAN,
 };
 
-static int xen_pv_init(PCIDevice *pci_dev)
+static void xen_pv_realize(PCIDevice *pci_dev, Error **errp)
 {
     XenPVDevice *d = XEN_PV_DEVICE(pci_dev);
     uint8_t *pci_conf;
 
     /* device-id property must always be supplied */
-    if (d->device_id == 0xffff)
-	    return -1;
+    if (d->device_id == 0xffff) {
+        error_setg(errp, "Device ID invalid, it must always be supplied");
+        return;
+    }
 
     pci_conf = pci_dev->config;
 
@@ -97,8 +99,6 @@ static int xen_pv_init(PCIDevice *pci_dev)
 
     pci_register_bar(pci_dev, 1, PCI_BASE_ADDRESS_MEM_PREFETCH,
                      &d->mmio);
-
-    return 0;
 }
 
 static Property xen_pv_props[] = {
@@ -114,7 +114,7 @@ static void xen_pv_class_init(ObjectClass *klass, void *data)
     DeviceClass *dc = DEVICE_CLASS(klass);
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 
-    k->init = xen_pv_init;
+    k->realize = xen_pv_realize;
     k->class_id = PCI_CLASS_SYSTEM_OTHER;
     dc->desc = "Xen PV Device";
     dc->props = xen_pv_props;

hw/xen/xen-host-pci-device.c

@@ -31,25 +31,20 @@
 #define IORESOURCE_PREFETCH     0x00001000      /* No side effects */
 #define IORESOURCE_MEM_64       0x00100000
 
-static int xen_host_pci_sysfs_path(const XenHostPCIDevice *d,
-                                   const char *name, char *buf, ssize_t size)
+static void xen_host_pci_sysfs_path(const XenHostPCIDevice *d,
+                                    const char *name, char *buf, ssize_t size)
 {
     int rc;
 
     rc = snprintf(buf, size, "/sys/bus/pci/devices/%04x:%02x:%02x.%d/%s",
                   d->domain, d->bus, d->dev, d->func, name);
-
-    if (rc >= size || rc < 0) {
-        /* The output is truncated, or some other error was encountered */
-        return -ENODEV;
-    }
-    return 0;
+    assert(rc >= 0 && rc < size);
 }
 
 
 /* This size should be enough to read the first 7 lines of a resource file */
 #define XEN_HOST_PCI_RESOURCE_BUFFER_SIZE 400
-static int xen_host_pci_get_resource(XenHostPCIDevice *d)
+static void xen_host_pci_get_resource(XenHostPCIDevice *d, Error **errp)
 {
     int i, rc, fd;
     char path[PATH_MAX];
@@ -58,25 +53,22 @@ static int xen_host_pci_get_resource(XenHostPCIDevice *d)
     char *endptr, *s;
     uint8_t type;
 
-    rc = xen_host_pci_sysfs_path(d, "resource", path, sizeof (path));
-    if (rc) {
-        return rc;
-    }
+    xen_host_pci_sysfs_path(d, "resource", path, sizeof(path));
+
     fd = open(path, O_RDONLY);
     if (fd == -1) {
-        XEN_HOST_PCI_LOG("Error: Can't open %s: %s\n", path, strerror(errno));
-        return -errno;
+        error_setg_file_open(errp, errno, path);
+        return;
     }
 
     do {
-        rc = read(fd, &buf, sizeof (buf) - 1);
+        rc = read(fd, &buf, sizeof(buf) - 1);
         if (rc < 0 && errno != EINTR) {
-            rc = -errno;
+            error_setg_errno(errp, errno, "read err");
             goto out;
         }
     } while (rc < 0);
     buf[rc] = 0;
-    rc = 0;
 
     s = buf;
     for (i = 0; i < PCI_NUM_REGIONS; i++) {
@@ -129,70 +121,69 @@ static int xen_host_pci_get_resource(XenHostPCIDevice *d)
             d->rom.bus_flags = flags & IORESOURCE_BITS;
         }
     }
+
     if (i != PCI_NUM_REGIONS) {
-        /* Invalid format or input to short */
-        rc = -ENODEV;
+        error_setg(errp, "Invalid format or input too short: %s", buf);
     }
 
 out:
     close(fd);
-    return rc;
 }
 
 /* This size should be enough to read a long from a file */
 #define XEN_HOST_PCI_GET_VALUE_BUFFER_SIZE 22
-static int xen_host_pci_get_value(XenHostPCIDevice *d, const char *name,
-                                  unsigned int *pvalue, int base)
+static void xen_host_pci_get_value(XenHostPCIDevice *d, const char *name,
+                                   unsigned int *pvalue, int base, Error **errp)
 {
     char path[PATH_MAX];
     char buf[XEN_HOST_PCI_GET_VALUE_BUFFER_SIZE];
     int fd, rc;
     unsigned long value;
-    char *endptr;
+    const char *endptr;
+
+    xen_host_pci_sysfs_path(d, name, path, sizeof(path));
 
-    rc = xen_host_pci_sysfs_path(d, name, path, sizeof (path));
-    if (rc) {
-        return rc;
-    }
     fd = open(path, O_RDONLY);
     if (fd == -1) {
-        XEN_HOST_PCI_LOG("Error: Can't open %s: %s\n", path, strerror(errno));
-        return -errno;
+        error_setg_file_open(errp, errno, path);
+        return;
     }
+
     do {
-        rc = read(fd, &buf, sizeof (buf) - 1);
+        rc = read(fd, &buf, sizeof(buf) - 1);
         if (rc < 0 && errno != EINTR) {
-            rc = -errno;
+            error_setg_errno(errp, errno, "read err");
             goto out;
         }
     } while (rc < 0);
+
     buf[rc] = 0;
-    value = strtol(buf, &endptr, base);
-    if (endptr == buf || *endptr != '\n') {
-        rc = -1;
-    } else if ((value == LONG_MIN || value == LONG_MAX) && errno == ERANGE) {
-        rc = -errno;
-    } else {
-        rc = 0;
+    rc = qemu_strtoul(buf, &endptr, base, &value);
+    if (!rc) {
+        assert(value <= UINT_MAX);
         *pvalue = value;
+    } else {
+        error_setg_errno(errp, -rc, "failed to parse value '%s'", buf);
     }
+
 out:
     close(fd);
-    return rc;
 }
 
-static inline int xen_host_pci_get_hex_value(XenHostPCIDevice *d,
-                                             const char *name,
-                                             unsigned int *pvalue)
+static inline void xen_host_pci_get_hex_value(XenHostPCIDevice *d,
+                                              const char *name,
+                                              unsigned int *pvalue,
+                                              Error **errp)
 {
-    return xen_host_pci_get_value(d, name, pvalue, 16);
+    xen_host_pci_get_value(d, name, pvalue, 16, errp);
 }
 
-static inline int xen_host_pci_get_dec_value(XenHostPCIDevice *d,
-                                             const char *name,
-                                             unsigned int *pvalue)
+static inline void xen_host_pci_get_dec_value(XenHostPCIDevice *d,
+                                              const char *name,
+                                              unsigned int *pvalue,
+                                              Error **errp)
 {
-    return xen_host_pci_get_value(d, name, pvalue, 10);
+    xen_host_pci_get_value(d, name, pvalue, 10, errp);
 }
 
 static bool xen_host_pci_dev_is_virtfn(XenHostPCIDevice *d)
@@ -200,26 +191,21 @@ static bool xen_host_pci_dev_is_virtfn(XenHostPCIDevice *d)
     char path[PATH_MAX];
     struct stat buf;
 
-    if (xen_host_pci_sysfs_path(d, "physfn", path, sizeof (path))) {
-        return false;
-    }
+    xen_host_pci_sysfs_path(d, "physfn", path, sizeof(path));
+
     return !stat(path, &buf);
 }
 
-static int xen_host_pci_config_open(XenHostPCIDevice *d)
+static void xen_host_pci_config_open(XenHostPCIDevice *d, Error **errp)
 {
     char path[PATH_MAX];
-    int rc;
 
-    rc = xen_host_pci_sysfs_path(d, "config", path, sizeof (path));
-    if (rc) {
-        return rc;
-    }
+    xen_host_pci_sysfs_path(d, "config", path, sizeof(path));
+
     d->config_fd = open(path, O_RDWR);
-    if (d->config_fd < 0) {
-        return -errno;
+    if (d->config_fd == -1) {
+        error_setg_file_open(errp, errno, path);
     }
-    return 0;
 }
 
 static int xen_host_pci_config_read(XenHostPCIDevice *d,
@@ -341,11 +327,12 @@ int xen_host_pci_find_ext_cap_offset(XenHostPCIDevice *d, uint32_t cap)
     return -1;
 }
 
-int xen_host_pci_device_get(XenHostPCIDevice *d, uint16_t domain,
-                            uint8_t bus, uint8_t dev, uint8_t func)
+void xen_host_pci_device_get(XenHostPCIDevice *d, uint16_t domain,
+                             uint8_t bus, uint8_t dev, uint8_t func,
+                             Error **errp)
 {
     unsigned int v;
-    int rc = 0;
+    Error *err = NULL;
 
     d->config_fd = -1;
     d->domain = domain;
@@ -353,43 +340,51 @@ int xen_host_pci_device_get(XenHostPCIDevice *d, uint16_t domain,
     d->dev = dev;
     d->func = func;
 
-    rc = xen_host_pci_config_open(d);
-    if (rc) {
+    xen_host_pci_config_open(d, &err);
+    if (err) {
         goto error;
     }
-    rc = xen_host_pci_get_resource(d);
-    if (rc) {
+
+    xen_host_pci_get_resource(d, &err);
+    if (err) {
         goto error;
     }
-    rc = xen_host_pci_get_hex_value(d, "vendor", &v);
-    if (rc) {
+
+    xen_host_pci_get_hex_value(d, "vendor", &v, &err);
+    if (err) {
         goto error;
     }
     d->vendor_id = v;
-    rc = xen_host_pci_get_hex_value(d, "device", &v);
-    if (rc) {
+
+    xen_host_pci_get_hex_value(d, "device", &v, &err);
+    if (err) {
         goto error;
     }
     d->device_id = v;
-    rc = xen_host_pci_get_dec_value(d, "irq", &v);
-    if (rc) {
+
+    xen_host_pci_get_dec_value(d, "irq", &v, &err);
+    if (err) {
         goto error;
     }
     d->irq = v;
-    rc = xen_host_pci_get_hex_value(d, "class", &v);
-    if (rc) {
+
+    xen_host_pci_get_hex_value(d, "class", &v, &err);
+    if (err) {
         goto error;
     }
     d->class_code = v;
+
     d->is_virtfn = xen_host_pci_dev_is_virtfn(d);
 
-    return 0;
+    return;
+
 error:
+    error_propagate(errp, err);
+
     if (d->config_fd >= 0) {
         close(d->config_fd);
         d->config_fd = -1;
     }
-    return rc;
 }
 
 bool xen_host_pci_device_closed(XenHostPCIDevice *d)

hw/xen/xen-host-pci-device.h

@@ -36,8 +36,9 @@ typedef struct XenHostPCIDevice {
     int config_fd;
 } XenHostPCIDevice;
 
-int xen_host_pci_device_get(XenHostPCIDevice *d, uint16_t domain,
-                            uint8_t bus, uint8_t dev, uint8_t func);
+void xen_host_pci_device_get(XenHostPCIDevice *d, uint16_t domain,
+                             uint8_t bus, uint8_t dev, uint8_t func,
+                             Error **errp);
 void xen_host_pci_device_put(XenHostPCIDevice *pci_dev);
 bool xen_host_pci_device_closed(XenHostPCIDevice *d);
 

hw/xen/xen_pt.c

@@ -760,13 +760,14 @@ static void xen_pt_destroy(PCIDevice *d) {
 }
 /* init */
 
-static int xen_pt_initfn(PCIDevice *d)
+static void xen_pt_realize(PCIDevice *d, Error **errp)
 {
     XenPCIPassthroughState *s = XEN_PT_DEVICE(d);
-    int rc = 0;
+    int i, rc = 0;
     uint8_t machine_irq = 0, scratch;
     uint16_t cmd = 0;
     int pirq = XEN_PT_UNASSIGNED_PIRQ;
+    Error *err = NULL;
 
     /* register real device */
     XEN_PT_LOG(d, "Assigning real physical device %02x:%02x.%d"
@@ -774,12 +775,14 @@ static int xen_pt_initfn(PCIDevice *d)
                s->hostaddr.bus, s->hostaddr.slot, s->hostaddr.function,
                s->dev.devfn);
 
-    rc = xen_host_pci_device_get(&s->real_device,
-                                 s->hostaddr.domain, s->hostaddr.bus,
-                                 s->hostaddr.slot, s->hostaddr.function);
-    if (rc) {
-        XEN_PT_ERR(d, "Failed to \"open\" the real pci device. rc: %i\n", rc);
-        return -1;
+    xen_host_pci_device_get(&s->real_device,
+                            s->hostaddr.domain, s->hostaddr.bus,
+                            s->hostaddr.slot, s->hostaddr.function,
+                            &err);
+    if (err) {
+        error_append_hint(&err, "Failed to \"open\" the real pci device");
+        error_propagate(errp, err);
+        return;
     }
 
     s->is_virtfn = s->real_device.is_virtfn;
@@ -799,16 +802,19 @@ static int xen_pt_initfn(PCIDevice *d)
     if ((s->real_device.domain == 0) && (s->real_device.bus == 0) &&
         (s->real_device.dev == 2) && (s->real_device.func == 0)) {
         if (!is_igd_vga_passthrough(&s->real_device)) {
-            XEN_PT_ERR(d, "Need to enable igd-passthru if you're trying"
-                       " to passthrough IGD GFX.\n");
+            error_setg(errp, "Need to enable igd-passthru if you're trying"
+                    " to passthrough IGD GFX");
             xen_host_pci_device_put(&s->real_device);
-            return -1;
+            return;
         }
 
-        if (xen_pt_setup_vga(s, &s->real_device) < 0) {
-            XEN_PT_ERR(d, "Setup VGA BIOS of passthrough GFX failed!\n");
+        xen_pt_setup_vga(s, &s->real_device, &err);
+        if (err) {
+            error_append_hint(&err, "Setup VGA BIOS of passthrough"
+                    " GFX failed");
+            error_propagate(errp, err);
             xen_host_pci_device_put(&s->real_device);
-            return -1;
+            return;
         }
 
         /* Register ISA bridge for passthrough GFX. */
@@ -819,29 +825,30 @@ static int xen_pt_initfn(PCIDevice *d)
     xen_pt_register_regions(s, &cmd);
 
     /* reinitialize each config register to be emulated */
-    rc = xen_pt_config_init(s);
-    if (rc) {
-        XEN_PT_ERR(d, "PCI Config space initialisation failed.\n");
+    xen_pt_config_init(s, &err);
+    if (err) {
+        error_append_hint(&err, "PCI Config space initialisation failed");
+        error_report_err(err);
+        rc = -1;
         goto err_out;
     }
 
     /* Bind interrupt */
     rc = xen_host_pci_get_byte(&s->real_device, PCI_INTERRUPT_PIN, &scratch);
     if (rc) {
-        XEN_PT_ERR(d, "Failed to read PCI_INTERRUPT_PIN! (rc:%d)\n", rc);
+        error_setg_errno(errp, errno, "Failed to read PCI_INTERRUPT_PIN");
         goto err_out;
     }
     if (!scratch) {
-        XEN_PT_LOG(d, "no pin interrupt\n");
+        error_setg(errp, "no pin interrupt");
         goto out;
     }
 
     machine_irq = s->real_device.irq;
     rc = xc_physdev_map_pirq(xen_xc, xen_domid, machine_irq, &pirq);
-
     if (rc < 0) {
-        XEN_PT_ERR(d, "Mapping machine irq %u to pirq %i failed, (err: %d)\n",
-                   machine_irq, pirq, errno);
+        error_setg_errno(errp, errno, "Mapping machine irq %u to"
+                         " pirq %i failed", machine_irq, pirq);
 
         /* Disable PCI intx assertion (turn on bit10 of devctl) */
         cmd |= PCI_COMMAND_INTX_DISABLE;
@@ -862,8 +869,8 @@ static int xen_pt_initfn(PCIDevice *d)
                                        PCI_SLOT(d->devfn),
                                        e_intx);
         if (rc < 0) {
-            XEN_PT_ERR(d, "Binding of interrupt %i failed! (err: %d)\n",
-                       e_intx, errno);
+            error_setg_errno(errp, errno, "Binding of interrupt %u failed",
+                             e_intx);
 
             /* Disable PCI intx assertion (turn on bit10 of devctl) */
             cmd |= PCI_COMMAND_INTX_DISABLE;
@@ -871,8 +878,8 @@ static int xen_pt_initfn(PCIDevice *d)
 
             if (xen_pt_mapped_machine_irq[machine_irq] == 0) {
                 if (xc_physdev_unmap_pirq(xen_xc, xen_domid, machine_irq)) {
-                    XEN_PT_ERR(d, "Unmapping of machine interrupt %i failed!"
-                               " (err: %d)\n", machine_irq, errno);
+                    error_setg_errno(errp, errno, "Unmapping of machine"
+                            " interrupt %u failed", machine_irq);
                 }
             }
             s->machine_irq = 0;
@@ -885,14 +892,14 @@ out:
 
         rc = xen_host_pci_get_word(&s->real_device, PCI_COMMAND, &val);
         if (rc) {
-            XEN_PT_ERR(d, "Failed to read PCI_COMMAND! (rc: %d)\n", rc);
+            error_setg_errno(errp, errno, "Failed to read PCI_COMMAND");
             goto err_out;
         } else {
             val |= cmd;
             rc = xen_host_pci_set_word(&s->real_device, PCI_COMMAND, val);
             if (rc) {
-                XEN_PT_ERR(d, "Failed to write PCI_COMMAND val=0x%x!(rc: %d)\n",
-                           val, rc);
+                error_setg_errno(errp, errno, "Failed to write PCI_COMMAND"
+                                 " val = 0x%x", val);
                 goto err_out;
             }
         }
@@ -902,15 +909,19 @@ out:
     memory_listener_register(&s->io_listener, &address_space_io);
     s->listener_set = true;
     XEN_PT_LOG(d,
-               "Real physical device %02x:%02x.%d registered successfully!\n",
+               "Real physical device %02x:%02x.%d registered successfully\n",
                s->hostaddr.bus, s->hostaddr.slot, s->hostaddr.function);
 
-    return 0;
+    return;
 
 err_out:
+    for (i = 0; i < PCI_ROM_SLOT; i++) {
+        object_unparent(OBJECT(&s->bar[i]));
+    }
+    object_unparent(OBJECT(&s->rom));
+
     xen_pt_destroy(d);
     assert(rc);
-    return rc;
 }
 
 static void xen_pt_unregister_device(PCIDevice *d)
@@ -929,7 +940,7 @@ static void xen_pci_passthrough_class_init(ObjectClass *klass, void *data)
     DeviceClass *dc = DEVICE_CLASS(klass);
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 
-    k->init = xen_pt_initfn;
+    k->realize = xen_pt_realize;
     k->exit = xen_pt_unregister_device;
     k->config_read = xen_pt_pci_read_config;
     k->config_write = xen_pt_pci_write_config;

hw/xen/xen_pt.h

@@ -230,7 +230,7 @@ struct XenPCIPassthroughState {
     bool listener_set;
 };
 
-int xen_pt_config_init(XenPCIPassthroughState *s);
+void xen_pt_config_init(XenPCIPassthroughState *s, Error **errp);
 void xen_pt_config_delete(XenPCIPassthroughState *s);
 XenPTRegGroup *xen_pt_find_reg_grp(XenPCIPassthroughState *s, uint32_t address);
 XenPTReg *xen_pt_find_reg(XenPTRegGroup *reg_grp, uint32_t address);
@@ -330,5 +330,6 @@ static inline bool is_igd_vga_passthrough(XenHostPCIDevice *dev)
 }
 int xen_pt_register_vga_regions(XenHostPCIDevice *dev);
 int xen_pt_unregister_vga_regions(XenHostPCIDevice *dev);
-int xen_pt_setup_vga(XenPCIPassthroughState *s, XenHostPCIDevice *dev);
+void xen_pt_setup_vga(XenPCIPassthroughState *s, XenHostPCIDevice *dev,
+                     Error **errp);
 #endif /* !XEN_PT_H */

hw/xen/xen_pt_config_init.c

@@ -1887,8 +1887,9 @@ static uint8_t find_cap_offset(XenPCIPassthroughState *s, uint8_t cap)
     return 0;
 }
 
-static int xen_pt_config_reg_init(XenPCIPassthroughState *s,
-                                  XenPTRegGroup *reg_grp, XenPTRegInfo *reg)
+static void xen_pt_config_reg_init(XenPCIPassthroughState *s,
+                                   XenPTRegGroup *reg_grp, XenPTRegInfo *reg,
+                                   Error **errp)
 {
     XenPTReg *reg_entry;
     uint32_t data = 0;
@@ -1907,12 +1908,13 @@ static int xen_pt_config_reg_init(XenPCIPassthroughState *s,
                        reg_grp->base_offset + reg->offset, &data);
         if (rc < 0) {
             g_free(reg_entry);
-            return rc;
+            error_setg(errp, "Init emulate register fail");
+            return;
         }
         if (data == XEN_PT_INVALID_REG) {
             /* free unused BAR register entry */
             g_free(reg_entry);
-            return 0;
+            return;
         }
         /* Sync up the data to dev.config */
         offset = reg_grp->base_offset + reg->offset;
@@ -1930,7 +1932,8 @@ static int xen_pt_config_reg_init(XenPCIPassthroughState *s,
         if (rc) {
             /* Serious issues when we cannot read the host values! */
             g_free(reg_entry);
-            return rc;
+            error_setg(errp, "Cannot read host values");
+            return;
         }
         /* Set bits in emu_mask are the ones we emulate. The dev.config shall
          * contain the emulated view of the guest - therefore we flip the mask
@@ -1955,10 +1958,10 @@ static int xen_pt_config_reg_init(XenPCIPassthroughState *s,
             val = data;
 
         if (val & ~size_mask) {
-            XEN_PT_ERR(&s->dev,"Offset 0x%04x:0x%04x expands past register size(%d)!\n",
-                       offset, val, reg->size);
+            error_setg(errp, "Offset 0x%04x:0x%04x expands past"
+                    " register size (%d)", offset, val, reg->size);
             g_free(reg_entry);
-            return -ENXIO;
+            return;
         }
         /* This could be just pci_set_long as we don't modify the bits
          * past reg->size, but in case this routine is run in parallel or the
@@ -1978,13 +1981,12 @@ static int xen_pt_config_reg_init(XenPCIPassthroughState *s,
     }
     /* list add register entry */
     QLIST_INSERT_HEAD(&reg_grp->reg_tbl_list, reg_entry, entries);
-
-    return 0;
 }
 
-int xen_pt_config_init(XenPCIPassthroughState *s)
+void xen_pt_config_init(XenPCIPassthroughState *s, Error **errp)
 {
     int i, rc;
+    Error *err = NULL;
 
     QLIST_INIT(&s->reg_grps);
 
@@ -2027,11 +2029,12 @@ int xen_pt_config_init(XenPCIPassthroughState *s)
                                                   reg_grp_offset,
                                                   &reg_grp_entry->size);
             if (rc < 0) {
-                XEN_PT_LOG(&s->dev, "Failed to initialize %d/%ld, type=0x%x, rc:%d\n",
-                           i, ARRAY_SIZE(xen_pt_emu_reg_grps),
+                error_setg(&err, "Failed to initialize %d/%zu, type = 0x%x,"
+                           " rc: %d", i, ARRAY_SIZE(xen_pt_emu_reg_grps),
                            xen_pt_emu_reg_grps[i].grp_type, rc);
+                error_propagate(errp, err);
                 xen_pt_config_delete(s);
-                return rc;
+                return;
             }
         }
 
@@ -2039,24 +2042,24 @@ int xen_pt_config_init(XenPCIPassthroughState *s)
             if (xen_pt_emu_reg_grps[i].emu_regs) {
                 int j = 0;
                 XenPTRegInfo *regs = xen_pt_emu_reg_grps[i].emu_regs;
+
                 /* initialize capability register */
                 for (j = 0; regs->size != 0; j++, regs++) {
-                    /* initialize capability register */
-                    rc = xen_pt_config_reg_init(s, reg_grp_entry, regs);
-                    if (rc < 0) {
-                        XEN_PT_LOG(&s->dev, "Failed to initialize %d/%ld reg 0x%x in grp_type=0x%x (%d/%ld), rc=%d\n",
-                                   j, ARRAY_SIZE(xen_pt_emu_reg_grps[i].emu_regs),
-                                   regs->offset, xen_pt_emu_reg_grps[i].grp_type,
-                                   i, ARRAY_SIZE(xen_pt_emu_reg_grps), rc);
+                    xen_pt_config_reg_init(s, reg_grp_entry, regs, &err);
+                    if (err) {
+                        error_append_hint(&err, "Failed to initialize %d/%zu"
+                                " reg 0x%x in grp_type = 0x%x (%d/%zu)",
+                                j, ARRAY_SIZE(xen_pt_emu_reg_grps[i].emu_regs),
+                                regs->offset, xen_pt_emu_reg_grps[i].grp_type,
+                                i, ARRAY_SIZE(xen_pt_emu_reg_grps));
+                        error_propagate(errp, err);
                         xen_pt_config_delete(s);
-                        return rc;
+                        return;
                     }
                 }
             }
         }
     }
-
-    return 0;
 }
 
 /* delete all emulate register */

hw/xen/xen_pt_graphics.c

@@ -161,7 +161,8 @@ struct pci_data {
     uint16_t reserved;
 } __attribute__((packed));
 
-int xen_pt_setup_vga(XenPCIPassthroughState *s, XenHostPCIDevice *dev)
+void xen_pt_setup_vga(XenPCIPassthroughState *s, XenHostPCIDevice *dev,
+                     Error **errp)
 {
     unsigned char *bios = NULL;
     struct rom_header *rom;
@@ -172,13 +173,14 @@ int xen_pt_setup_vga(XenPCIPassthroughState *s, XenHostPCIDevice *dev)
     struct pci_data *pd = NULL;
 
     if (!is_igd_vga_passthrough(dev)) {
-        return -1;
+        error_setg(errp, "Need to enable igd-passthrough");
+        return;
     }
 
     bios = get_vgabios(s, &bios_size, dev);
     if (!bios) {
-        XEN_PT_ERR(&s->dev, "VGA: Can't getting VBIOS!\n");
-        return -1;
+        error_setg(errp, "VGA: Can't get VBIOS");
+        return;
     }
 
     /* Currently we fixed this address as a primary. */
@@ -203,7 +205,6 @@ int xen_pt_setup_vga(XenPCIPassthroughState *s, XenHostPCIDevice *dev)
 
     /* Currently we fixed this address as a primary for legacy BIOS. */
     cpu_physical_memory_rw(0xc0000, bios, bios_size, 1);
-    return 0;
 }
 
 uint32_t igd_read_opregion(XenPCIPassthroughState *s)

include/hw/xen/xen.h

@@ -39,9 +39,9 @@ qemu_irq *xen_interrupt_controller_init(void);
 void xenstore_store_pv_console_info(int i, struct CharDriverState *chr);
 
 #if defined(NEED_CPU_H) && !defined(CONFIG_USER_ONLY)
-int xen_hvm_init(PCMachineState *pcms, MemoryRegion **ram_memory);
+void xen_hvm_init(PCMachineState *pcms, MemoryRegion **ram_memory);
 void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size,
-                   struct MemoryRegion *mr);
+                   struct MemoryRegion *mr, Error **errp);
 void xen_modified_memory(ram_addr_t start, ram_addr_t length);
 #endif
 

xen-hvm-stub.c

@@ -30,7 +30,8 @@ void xen_hvm_inject_msi(uint64_t addr, uint32_t data)
 {
 }
 
-void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size, MemoryRegion *mr)
+void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size, MemoryRegion *mr,
+                   Error **errp)
 {
 }
 
@@ -47,9 +48,8 @@ void xen_modified_memory(ram_addr_t start, ram_addr_t length)
 {
 }
 
-int xen_hvm_init(PCMachineState *pcms, MemoryRegion **ram_memory)
+void xen_hvm_init(PCMachineState *pcms, MemoryRegion **ram_memory)
 {
-    return 0;
 }
 
 void qmp_xen_set_global_dirty_log(bool enable, Error **errp)

xen-hvm.c

@@ -17,6 +17,7 @@
 #include "qmp-commands.h"
 
 #include "sysemu/char.h"
+#include "qemu/error-report.h"
 #include "qemu/range.h"
 #include "sysemu/xen-mapcache.h"
 #include "trace.h"
@@ -238,9 +239,9 @@ static void xen_ram_init(PCMachineState *pcms,
     }
 }
 
-void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size, MemoryRegion *mr)
+void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size, MemoryRegion *mr,
+                   Error **errp)
 {
-    /* FIXME caller ram_block_add() wants error_setg() on failure */
     unsigned long nr_pfn;
     xen_pfn_t *pfn_list;
     int i;
@@ -267,7 +268,8 @@ void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size, MemoryRegion *mr)
     }
 
     if (xc_domain_populate_physmap_exact(xen_xc, xen_domid, nr_pfn, 0, 0, pfn_list)) {
-        hw_error("xen: failed to populate ram at " RAM_ADDR_FMT, ram_addr);
+        error_setg(errp, "xen: failed to populate ram at " RAM_ADDR_FMT,
+                   ram_addr);
     }
 
     g_free(pfn_list);
@@ -1189,16 +1191,8 @@ static void xen_wakeup_notifier(Notifier *notifier, void *data)
     xc_set_hvm_param(xen_xc, xen_domid, HVM_PARAM_ACPI_S_STATE, 0);
 }
 
-/* return 0 means OK, or -1 means critical issue -- will exit(1) */
-int xen_hvm_init(PCMachineState *pcms,
-                 MemoryRegion **ram_memory)
+void xen_hvm_init(PCMachineState *pcms, MemoryRegion **ram_memory)
 {
-    /*
-     * FIXME Returns -1 without cleaning up on some errors (harmless
-     * as long as the caller exit()s on error), dies with hw_error()
-     * on others.  hw_error() isn't approprate here.  Should probably
-     * simply exit() on all errors.
-     */
     int i, rc;
     xen_pfn_t ioreq_pfn;
     xen_pfn_t bufioreq_pfn;
@@ -1210,19 +1204,19 @@ int xen_hvm_init(PCMachineState *pcms,
     state->xce_handle = xen_xc_evtchn_open(NULL, 0);
     if (state->xce_handle == XC_HANDLER_INITIAL_VALUE) {
         perror("xen: event channel open");
-        return -1;
+        goto err;
     }
 
     state->xenstore = xs_daemon_open();
     if (state->xenstore == NULL) {
         perror("xen: xenstore open");
-        return -1;
+        goto err;
     }
 
     rc = xen_create_ioreq_server(xen_xc, xen_domid, &state->ioservid);
     if (rc < 0) {
         perror("xen: ioreq server create");
-        return -1;
+        goto err;
     }
 
     state->exit.notify = xen_exit_notifier;
@@ -1238,8 +1232,9 @@ int xen_hvm_init(PCMachineState *pcms,
                                    &ioreq_pfn, &bufioreq_pfn,
                                    &bufioreq_evtchn);
     if (rc < 0) {
-        hw_error("failed to get ioreq server info: error %d handle=" XC_INTERFACE_FMT,
-                 errno, xen_xc);
+        error_report("failed to get ioreq server info: error %d handle=" XC_INTERFACE_FMT,
+                     errno, xen_xc);
+        goto err;
     }
 
     DPRINTF("shared page at pfn %lx\n", ioreq_pfn);
@@ -1249,8 +1244,9 @@ int xen_hvm_init(PCMachineState *pcms,
     state->shared_page = xc_map_foreign_range(xen_xc, xen_domid, XC_PAGE_SIZE,
                                               PROT_READ|PROT_WRITE, ioreq_pfn);
     if (state->shared_page == NULL) {
-        hw_error("map shared IO page returned error %d handle=" XC_INTERFACE_FMT,
-                 errno, xen_xc);
+        error_report("map shared IO page returned error %d handle=" XC_INTERFACE_FMT,
+                     errno, xen_xc);
+        goto err;
     }
 
     rc = xen_get_vmport_regs_pfn(xen_xc, xen_domid, &ioreq_pfn);
@@ -1260,11 +1256,14 @@ int xen_hvm_init(PCMachineState *pcms,
             xc_map_foreign_range(xen_xc, xen_domid, XC_PAGE_SIZE,
                                  PROT_READ|PROT_WRITE, ioreq_pfn);
         if (state->shared_vmport_page == NULL) {
-            hw_error("map shared vmport IO page returned error %d handle="
-                     XC_INTERFACE_FMT, errno, xen_xc);
+            error_report("map shared vmport IO page returned error %d handle="
+                         XC_INTERFACE_FMT, errno, xen_xc);
+            goto err;
         }
     } else if (rc != -ENOSYS) {
-        hw_error("get vmport regs pfn returned error %d, rc=%d", errno, rc);
+        error_report("get vmport regs pfn returned error %d, rc=%d",
+                     errno, rc);
+        goto err;
     }
 
     state->buffered_io_page = xc_map_foreign_range(xen_xc, xen_domid,
@@ -1272,7 +1271,8 @@ int xen_hvm_init(PCMachineState *pcms,
                                                    PROT_READ|PROT_WRITE,
                                                    bufioreq_pfn);
     if (state->buffered_io_page == NULL) {
-        hw_error("map buffered IO page returned error %d", errno);
+        error_report("map buffered IO page returned error %d", errno);
+        goto err;
     }
 
     /* Note: cpus is empty at this point in init */
@@ -1280,8 +1280,9 @@ int xen_hvm_init(PCMachineState *pcms,
 
     rc = xen_set_ioreq_server_state(xen_xc, xen_domid, state->ioservid, true);
     if (rc < 0) {
-        hw_error("failed to enable ioreq server info: error %d handle=" XC_INTERFACE_FMT,
-                 errno, xen_xc);
+        error_report("failed to enable ioreq server info: error %d handle=" XC_INTERFACE_FMT,
+                     errno, xen_xc);
+        goto err;
     }
 
     state->ioreq_local_port = g_malloc0(max_cpus * sizeof (evtchn_port_t));
@@ -1291,8 +1292,8 @@ int xen_hvm_init(PCMachineState *pcms,
         rc = xc_evtchn_bind_interdomain(state->xce_handle, xen_domid,
                                         xen_vcpu_eport(state->shared_page, i));
         if (rc == -1) {
-            fprintf(stderr, "shared evtchn %d bind error %d\n", i, errno);
-            return -1;
+            error_report("shared evtchn %d bind error %d", i, errno);
+            goto err;
         }
         state->ioreq_local_port[i] = rc;
     }
@@ -1300,8 +1301,8 @@ int xen_hvm_init(PCMachineState *pcms,
     rc = xc_evtchn_bind_interdomain(state->xce_handle, xen_domid,
                                     bufioreq_evtchn);
     if (rc == -1) {
-        fprintf(stderr, "buffered evtchn bind error %d\n", errno);
-        return -1;
+        error_report("buffered evtchn bind error %d", errno);
+        goto err;
     }
     state->bufioreq_local_port = rc;
 
@@ -1324,15 +1325,18 @@ int xen_hvm_init(PCMachineState *pcms,
 
     /* Initialize backend core & drivers */
     if (xen_be_init() != 0) {
-        fprintf(stderr, "%s: xen backend core setup failed\n", __FUNCTION__);
-        return -1;
+        error_report("xen backend core setup failed");
+        goto err;
     }
     xen_be_register("console", &xen_console_ops);
     xen_be_register("vkbd", &xen_kbdmouse_ops);
     xen_be_register("qdisk", &xen_blkdev_ops);
     xen_read_physmap(state);
+    return;
 
-    return 0;
+err:
+    error_report("xen hardware virtual machine initialisation failed");
+    exit(1);
 }
 
 void destroy_hvm_domain(bool reboot)