[Qemu-devel] [PATCH v4 0/6] save/restore on Xen

[Qemu-devel] [PATCH v4 0/6] save/restore on Xen

[Stefano Stabellini]

Hi all,
this is the fourth version of the Xen save/restore patch series.
We have been discussing this issue for quite a while on #qemu and
qemu-devel:


http://marc.info/?l=qemu-devel&m=132346828427314&w=2
http://marc.info/?l=qemu-devel&m=132377734605464&w=2


The principal changes in the this version are:

- Following Anthony's suggestion I have introduced a new monitor command
to save the non-ram device state to file.

- I have also removed the hack not to reset the cirrus videoram on
restore, because it turns out that the videoram doesn't need to be
reset in the reset handler at all (tested on Win2K, where the problem
was found in the first place).



This is the list of patches with a diffstat:

Anthony PERARD (2):
      xen mapcache: check if memory region has moved.
      xen: do not allocate RAM during INMIGRATE runstate

Stefano Stabellini (4):
      cirrus_vga: do not reset videoram
      Introduce "save_devices"
      xen: record physmap changes to xenstore
      Set runstate to INMIGRATE earlier

 block-migration.c |    2 +-
 hmp-commands.hx   |   14 +++++++
 hw/cirrus_vga.c   |    4 --
 hw/hw.h           |    1 +
 qmp-commands.hx   |   17 +++++++++
 savevm.c          |   72 ++++++++++++++++++++++++++++++++++++-
 sysemu.h          |    1 +
 vl.c              |    4 +-
 xen-all.c         |  104 +++++++++++++++++++++++++++++++++++++++++++++++++++-
 xen-mapcache.c    |   22 ++++++++++--
 xen-mapcache.h    |    9 ++++-
 11 files changed, 235 insertions(+), 15 deletions(-)


git://xenbits.xen.org/people/sstabellini/qemu-dm.git saverestore-4

Cheers,

Stefano

[Qemu-devel] [PATCH v4 1/6] cirrus_vga: do not reset videoram

[Stefano Stabellini]

There is no need to set the videoram to 0xff in cirrus_reset, because it
is the BIOS' job.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 hw/cirrus_vga.c |    4 ----
 1 files changed, 0 insertions(+), 4 deletions(-)

diff --git a/hw/cirrus_vga.c b/hw/cirrus_vga.c
index f7b1d3d..5564478 100644
--- a/hw/cirrus_vga.c
+++ b/hw/cirrus_vga.c
@@ -2760,10 +2760,6 @@ static void cirrus_reset(void *opaque)
     }
     s->vga.cr[0x27] = s->device_id;
 
-    /* Win2K seems to assume that the pattern buffer is at 0xff
-       initially ! */
-    memset(s->vga.vram_ptr, 0xff, s->real_vram_size);
-
     s->cirrus_hidden_dac_lockindex = 5;
     s->cirrus_hidden_dac_data = 0;
 }
-- 
1.7.2.5

[Qemu-devel] [PATCH v4 2/6] Introduce "save_devices"

[Stefano Stabellini]

- add an "is_ram" flag to SaveStateEntry;

- add an "is_ram" parameter to register_savevm_live;

- introduce a "save_devices" monitor command that can be used to save
the state of non-ram devices.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 block-migration.c |    2 +-
 hmp-commands.hx   |   14 ++++++++++
 hw/hw.h           |    1 +
 qmp-commands.hx   |   17 ++++++++++++
 savevm.c          |   72 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
 sysemu.h          |    1 +
 vl.c              |    2 +-
 7 files changed, 106 insertions(+), 3 deletions(-)

diff --git a/block-migration.c b/block-migration.c
index 2b7edbc..424a87d 100644
--- a/block-migration.c
+++ b/block-migration.c
@@ -720,6 +720,6 @@ void blk_mig_init(void)
     QSIMPLEQ_INIT(&block_mig_state.bmds_list);
     QSIMPLEQ_INIT(&block_mig_state.blk_list);
 
-    register_savevm_live(NULL, "block", 0, 1, block_set_params,
+    register_savevm_live(NULL, "block", 0, 1, 0, block_set_params,
                          block_save_live, NULL, block_load, &block_mig_state);
 }
diff --git a/hmp-commands.hx b/hmp-commands.hx
index a586498..ba4c9d5 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -241,6 +241,20 @@ a snapshot with the same tag or ID, it is replaced. More info at
 ETEXI
 
     {
+        .name       = "save_devices",
+        .args_type  = "filename:F",
+        .params     = "filename",
+        .help       = "save the state of non-ram devices.",
+        .mhandler.cmd_new = do_save_device_state,
+    },
+
+STEXI
+@item save_devices @var{filename}
+@findex save_devices
+Save the state of non-ram devices.
+ETEXI
+
+    {
         .name       = "loadvm",
         .args_type  = "name:s",
         .params     = "tag|id",
diff --git a/hw/hw.h b/hw/hw.h
index 932014a..9d3d76d 100644
--- a/hw/hw.h
+++ b/hw/hw.h
@@ -263,6 +263,7 @@ int register_savevm_live(DeviceState *dev,
                          const char *idstr,
                          int instance_id,
                          int version_id,
+                         int is_ram,
                          SaveSetParamsHandler *set_params,
 			 SaveLiveStateHandler *save_live_state,
                          SaveStateHandler *save_state,
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 7e3f4b9..51f4436 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -429,6 +429,23 @@ Note: inject-nmi is only supported for x86 guest currently, it will
 EQMP
 
     {
+        .name       = "save_devices",
+        .args_type  = "filename:F",
+        .params     = "filename",
+        .help       = "save the state of non-ram devices.",
+        .user_print = monitor_user_noop,	
+    .mhandler.cmd_new = do_save_device_state,
+    },
+
+SQMP
+save_devices
+-------
+
+Save the state of non-ram devices.
+
+EQMP
+
+    {
         .name       = "migrate",
         .args_type  = "detach:-d,blk:-b,inc:-i,uri:s",
         .params     = "[-d] [-b] [-i] uri",
diff --git a/savevm.c b/savevm.c
index 80be1ff..d0e62bb 100644
--- a/savevm.c
+++ b/savevm.c
@@ -1177,6 +1177,7 @@ typedef struct SaveStateEntry {
     void *opaque;
     CompatEntry *compat;
     int no_migrate;
+    int is_ram;
 } SaveStateEntry;
 
 
@@ -1223,6 +1224,7 @@ int register_savevm_live(DeviceState *dev,
                          const char *idstr,
                          int instance_id,
                          int version_id,
+                         int is_ram,
                          SaveSetParamsHandler *set_params,
                          SaveLiveStateHandler *save_live_state,
                          SaveStateHandler *save_state,
@@ -1241,6 +1243,7 @@ int register_savevm_live(DeviceState *dev,
     se->opaque = opaque;
     se->vmsd = NULL;
     se->no_migrate = 0;
+    se->is_ram = is_ram;
 
     if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
         char *id = dev->parent_bus->info->get_dev_path(dev);
@@ -1277,7 +1280,7 @@ int register_savevm(DeviceState *dev,
                     LoadStateHandler *load_state,
                     void *opaque)
 {
-    return register_savevm_live(dev, idstr, instance_id, version_id,
+    return register_savevm_live(dev, idstr, instance_id, version_id, 0,
                                 NULL, NULL, save_state, load_state, opaque);
 }
 
@@ -1728,6 +1731,43 @@ out:
     return ret;
 }
 
+static int qemu_save_device_state(Monitor *mon, QEMUFile *f)
+{
+    SaveStateEntry *se;
+
+    qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
+    qemu_put_be32(f, QEMU_VM_FILE_VERSION);
+
+    cpu_synchronize_all_states();
+
+    QTAILQ_FOREACH(se, &savevm_handlers, entry) {
+        int len;
+
+        if (se->is_ram)
+            continue;
+        if (se->save_state == NULL && se->vmsd == NULL)
+            continue;
+
+        /* Section type */
+        qemu_put_byte(f, QEMU_VM_SECTION_FULL);
+        qemu_put_be32(f, se->section_id);
+
+        /* ID string */
+        len = strlen(se->idstr);
+        qemu_put_byte(f, len);
+        qemu_put_buffer(f, (uint8_t *)se->idstr, len);
+
+        qemu_put_be32(f, se->instance_id);
+        qemu_put_be32(f, se->version_id);
+
+        vmstate_save(f, se);
+    }
+
+    qemu_put_byte(f, QEMU_VM_EOF);
+
+    return qemu_file_get_error(f);
+}
+
 static SaveStateEntry *find_se(const char *idstr, int instance_id)
 {
     SaveStateEntry *se;
@@ -2109,6 +2149,36 @@ void do_savevm(Monitor *mon, const QDict *qdict)
         vm_start();
 }
 
+int do_save_device_state(Monitor *mon, const QDict *qdict, QObject **ret_data)
+{
+    int ret;
+    QEMUFile *f;
+    int saved_vm_running;
+    const char *filename = qdict_get_try_str(qdict, "filename");
+
+    saved_vm_running = runstate_is_running();
+    vm_stop(RUN_STATE_SAVE_VM);
+
+    f = qemu_fopen(filename, "wb");
+    if (!f) {
+        monitor_printf(mon, "Could not open VM state file\n");
+        ret = -1;
+        goto the_end;
+    }
+    ret = qemu_save_device_state(mon, f);
+    qemu_fclose(f);
+    if (ret < 0) {
+        monitor_printf(mon, "Error %d while writing VM\n", ret);
+        goto the_end;
+    }
+    ret = 0;
+
+ the_end:
+    if (saved_vm_running)
+        vm_start();
+    return ret;
+}
+
 int load_vmstate(const char *name)
 {
     BlockDriverState *bs, *bs_vm_state;
diff --git a/sysemu.h b/sysemu.h
index ddef2bb..4103b08 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -59,6 +59,7 @@ void qemu_remove_exit_notifier(Notifier *notify);
 void qemu_add_machine_init_done_notifier(Notifier *notify);
 
 void do_savevm(Monitor *mon, const QDict *qdict);
+int do_save_device_state(Monitor *mon, const QDict *qdict, QObject **ret_data);
 int load_vmstate(const char *name);
 void do_delvm(Monitor *mon, const QDict *qdict);
 void do_info_snapshots(Monitor *mon);
diff --git a/vl.c b/vl.c
index ba55b35..c3a155f 100644
--- a/vl.c
+++ b/vl.c
@@ -3270,7 +3270,7 @@ int main(int argc, char **argv, char **envp)
     default_drive(default_sdcard, snapshot, machine->use_scsi,
                   IF_SD, 0, SD_OPTS);
 
-    register_savevm_live(NULL, "ram", 0, 4, NULL, ram_save_live, NULL,
+    register_savevm_live(NULL, "ram", 0, 4, 1, NULL, ram_save_live, NULL,
                          ram_load, NULL);
 
     if (nb_numa_nodes > 0) {
-- 
1.7.2.5

[Qemu-devel] [PATCH v4 3/6] xen: record physmap changes to xenstore

[Stefano Stabellini]

Write to xenstore any physmap changes so that the hypervisor can be
aware of them.
Read physmap changes from xenstore on boot.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 xen-all.c |   78 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 77 insertions(+), 1 deletions(-)

diff --git a/xen-all.c b/xen-all.c
index c86ebf4..4b00a6c 100644
--- a/xen-all.c
+++ b/xen-all.c
@@ -63,7 +63,7 @@ static inline ioreq_t *xen_vcpu_ioreq(shared_iopage_t *shared_page, int vcpu)
 typedef struct XenPhysmap {
     target_phys_addr_t start_addr;
     ram_addr_t size;
-    MemoryRegion *mr;
+    char *name;
     target_phys_addr_t phys_offset;
 
     QLIST_ENTRY(XenPhysmap) list;
@@ -237,6 +237,7 @@ static int xen_add_to_physmap(XenIOState *state,
     XenPhysmap *physmap = NULL;
     target_phys_addr_t pfn, start_gpfn;
     target_phys_addr_t phys_offset = memory_region_get_ram_addr(mr);
+    char path[80], value[17];
 
     if (get_physmapping(state, start_addr, size)) {
         return 0;
@@ -275,6 +276,7 @@ go_physmap:
 
     physmap->start_addr = start_addr;
     physmap->size = size;
+    physmap->name = (char *)mr->name;
     physmap->phys_offset = phys_offset;
 
     QLIST_INSERT_HEAD(&state->physmap, physmap, list);
@@ -283,6 +285,30 @@ go_physmap:
                                    start_addr >> TARGET_PAGE_BITS,
                                    (start_addr + size) >> TARGET_PAGE_BITS,
                                    XEN_DOMCTL_MEM_CACHEATTR_WB);
+
+    snprintf(path, sizeof(path),
+            "/local/domain/0/device-model/%d/physmap/%"PRIx64"/start_addr",
+            xen_domid, (uint64_t)phys_offset);
+    snprintf(value, sizeof(value), "%"PRIx64, (uint64_t)start_addr);
+    if (!xs_write(state->xenstore, 0, path, value, strlen(value))) {
+        return -1;
+    }
+    snprintf(path, sizeof(path),
+            "/local/domain/0/device-model/%d/physmap/%"PRIx64"/size",
+            xen_domid, (uint64_t)phys_offset);
+    snprintf(value, sizeof(value), "%"PRIx64, (uint64_t)size);
+    if (!xs_write(state->xenstore, 0, path, value, strlen(value))) {
+        return -1;
+    }
+    if (mr->name) {
+        snprintf(path, sizeof(path),
+                "/local/domain/0/device-model/%d/physmap/%"PRIx64"/name",
+                xen_domid, (uint64_t)phys_offset);
+        if (!xs_write(state->xenstore, 0, path, mr->name, strlen(mr->name))) {
+            return -1;
+        }
+    }
+
     return 0;
 }
 
@@ -910,6 +936,55 @@ int xen_init(void)
     return 0;
 }
 
+static void xen_read_physmap(XenIOState *state)
+{
+    XenPhysmap *physmap = NULL;
+    unsigned int len, num, i;
+    char path[80], *value = NULL;
+    char **entries = NULL;
+
+    snprintf(path, sizeof(path),
+            "/local/domain/0/device-model/%d/physmap", xen_domid);
+    entries = xs_directory(state->xenstore, 0, path, &num);
+    if (entries == NULL)
+        return;
+
+    for (i = 0; i < num; i++) {
+        physmap = g_malloc(sizeof (XenPhysmap));
+        physmap->phys_offset = strtoull(entries[i], NULL, 16);
+        snprintf(path, sizeof(path),
+                "/local/domain/0/device-model/%d/physmap/%s/start_addr",
+                xen_domid, entries[i]);
+        value = xs_read(state->xenstore, 0, path, &len);
+        if (value == NULL) {
+            free(physmap);
+            continue;
+        }
+        physmap->start_addr = strtoull(value, NULL, 16);
+        free(value);
+
+        snprintf(path, sizeof(path),
+                "/local/domain/0/device-model/%d/physmap/%s/size",
+                xen_domid, entries[i]);
+        value = xs_read(state->xenstore, 0, path, &len);
+        if (value == NULL) {
+            free(physmap);
+            continue;
+        }
+        physmap->size = strtoull(value, NULL, 16);
+        free(value);
+
+        snprintf(path, sizeof(path),
+                "/local/domain/0/device-model/%d/physmap/%s/name",
+                xen_domid, entries[i]);
+        physmap->name = xs_read(state->xenstore, 0, path, &len);
+
+        QLIST_INSERT_HEAD(&state->physmap, physmap, list);
+    }
+    free(entries);
+    return;
+}
+
 int xen_hvm_init(void)
 {
     int i, rc;
@@ -982,6 +1057,7 @@ int xen_hvm_init(void)
     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 0;
 }
-- 
1.7.2.5

[Qemu-devel] [PATCH v4 4/6] xen mapcache: check if memory region has moved.

[Stefano Stabellini]

From: Anthony PERARD <anthony.perard@citrix.com>

This patch changes the xen_map_cache behavior. Before trying to map a guest
addr, mapcache will look into the list of range of address that have been moved
(physmap/set_memory). There is currently one memory space like this, the vram,
"moved" from were it's allocated to were the guest will look into.

This help to have a succefull migration.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 xen-all.c      |   18 +++++++++++++++++-
 xen-mapcache.c |   22 +++++++++++++++++++---
 xen-mapcache.h |    9 +++++++--
 3 files changed, 43 insertions(+), 6 deletions(-)

diff --git a/xen-all.c b/xen-all.c
index 4b00a6c..bb66c82 100644
--- a/xen-all.c
+++ b/xen-all.c
@@ -225,6 +225,22 @@ static XenPhysmap *get_physmapping(XenIOState *state,
     return NULL;
 }
 
+static target_phys_addr_t xen_phys_offset_to_gaddr(target_phys_addr_t start_addr,
+                                                   ram_addr_t size, void *opaque)
+{
+    target_phys_addr_t addr = start_addr & TARGET_PAGE_MASK;
+    XenIOState *xen_io_state = opaque;
+    XenPhysmap *physmap = NULL;
+
+    QLIST_FOREACH(physmap, &xen_io_state->physmap, list) {
+        if (range_covers_byte(physmap->phys_offset, physmap->size, addr)) {
+            return physmap->start_addr;
+        }
+    }
+
+    return start_addr;
+}
+
 #if CONFIG_XEN_CTRL_INTERFACE_VERSION >= 340
 static int xen_add_to_physmap(XenIOState *state,
                               target_phys_addr_t start_addr,
@@ -1039,7 +1055,7 @@ int xen_hvm_init(void)
     }
 
     /* Init RAM management */
-    xen_map_cache_init();
+    xen_map_cache_init(xen_phys_offset_to_gaddr, state);
     xen_ram_init(ram_size);
 
     qemu_add_vm_change_state_handler(xen_hvm_change_state_handler, state);
diff --git a/xen-mapcache.c b/xen-mapcache.c
index 9fecc64..d9c995b 100644
--- a/xen-mapcache.c
+++ b/xen-mapcache.c
@@ -76,6 +76,9 @@ typedef struct MapCache {
     uint8_t *last_address_vaddr;
     unsigned long max_mcache_size;
     unsigned int mcache_bucket_shift;
+
+    phys_offset_to_gaddr_t phys_offset_to_gaddr;
+    void *opaque;
 } MapCache;
 
 static MapCache *mapcache;
@@ -89,13 +92,16 @@ static inline int test_bits(int nr, int size, const unsigned long *addr)
         return 0;
 }
 
-void xen_map_cache_init(void)
+void xen_map_cache_init(phys_offset_to_gaddr_t f, void *opaque)
 {
     unsigned long size;
     struct rlimit rlimit_as;
 
     mapcache = g_malloc0(sizeof (MapCache));
 
+    mapcache->phys_offset_to_gaddr = f;
+    mapcache->opaque = opaque;
+
     QTAILQ_INIT(&mapcache->locked_entries);
     mapcache->last_address_index = -1;
 
@@ -191,9 +197,14 @@ uint8_t *xen_map_cache(target_phys_addr_t phys_addr, target_phys_addr_t size,
                        uint8_t lock)
 {
     MapCacheEntry *entry, *pentry = NULL;
-    target_phys_addr_t address_index  = phys_addr >> MCACHE_BUCKET_SHIFT;
-    target_phys_addr_t address_offset = phys_addr & (MCACHE_BUCKET_SIZE - 1);
+    target_phys_addr_t address_index;
+    target_phys_addr_t address_offset;
     target_phys_addr_t __size = size;
+    bool translated = false;
+
+tryagain:
+    address_index  = phys_addr >> MCACHE_BUCKET_SHIFT;
+    address_offset = phys_addr & (MCACHE_BUCKET_SIZE - 1);
 
     trace_xen_map_cache(phys_addr);
 
@@ -235,6 +246,11 @@ uint8_t *xen_map_cache(target_phys_addr_t phys_addr, target_phys_addr_t size,
     if(!test_bits(address_offset >> XC_PAGE_SHIFT, size >> XC_PAGE_SHIFT,
                 entry->valid_mapping)) {
         mapcache->last_address_index = -1;
+        if (!translated && mapcache->phys_offset_to_gaddr) {
+            phys_addr = mapcache->phys_offset_to_gaddr(phys_addr, size, mapcache->opaque);
+            translated = true;
+            goto tryagain;
+        }
         trace_xen_map_cache_return(NULL);
         return NULL;
     }
diff --git a/xen-mapcache.h b/xen-mapcache.h
index da874ca..70301a5 100644
--- a/xen-mapcache.h
+++ b/xen-mapcache.h
@@ -11,9 +11,13 @@
 
 #include <stdlib.h>
 
+typedef target_phys_addr_t (*phys_offset_to_gaddr_t)(target_phys_addr_t start_addr,
+                                                     ram_addr_t size,
+                                                     void *opaque);
 #ifdef CONFIG_XEN
 
-void xen_map_cache_init(void);
+void xen_map_cache_init(phys_offset_to_gaddr_t f,
+                        void *opaque);
 uint8_t *xen_map_cache(target_phys_addr_t phys_addr, target_phys_addr_t size,
                        uint8_t lock);
 ram_addr_t xen_ram_addr_from_mapcache(void *ptr);
@@ -22,7 +26,8 @@ void xen_invalidate_map_cache(void);
 
 #else
 
-static inline void xen_map_cache_init(void)
+static inline void xen_map_cache_init(phys_offset_to_gaddr_t f,
+                                      void *opaque)
 {
 }
 
-- 
1.7.2.5

[Qemu-devel] [PATCH v4 5/6] Set runstate to INMIGRATE earlier

[Stefano Stabellini]

Set runstate to RUN_STATE_INMIGRATE as soon as we can on resume.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 vl.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/vl.c b/vl.c
index c3a155f..9b9a4fb 100644
--- a/vl.c
+++ b/vl.c
@@ -2972,6 +2972,7 @@ int main(int argc, char **argv, char **envp)
                 break;
             case QEMU_OPTION_incoming:
                 incoming = optarg;
+                runstate_set(RUN_STATE_INMIGRATE);
                 break;
             case QEMU_OPTION_nodefaults:
                 default_serial = 0;
@@ -3466,7 +3467,6 @@ int main(int argc, char **argv, char **envp)
     }
 
     if (incoming) {
-        runstate_set(RUN_STATE_INMIGRATE);
         int ret = qemu_start_incoming_migration(incoming);
         if (ret < 0) {
             fprintf(stderr, "Migration failed. Exit code %s(%d), exiting.\n",
-- 
1.7.2.5

[Qemu-devel] [PATCH v4 6/6] xen: do not allocate RAM during INMIGRATE runstate

[Stefano Stabellini]

From: Anthony PERARD <anthony.perard@citrix.com>

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 xen-all.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/xen-all.c b/xen-all.c
index bb66c82..5b10d0c 100644
--- a/xen-all.c
+++ b/xen-all.c
@@ -190,6 +190,14 @@ void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size, MemoryRegion *mr)
     xen_pfn_t *pfn_list;
     int i;
 
+    if (runstate_check(RUN_STATE_INMIGRATE)) {
+        /* RAM already populated in Xen */
+        fprintf(stderr, "%s: do not alloc "RAM_ADDR_FMT
+                " bytes of ram at "RAM_ADDR_FMT" when runstate is INMIGRATE\n",
+                __func__, size, ram_addr); 
+        return;
+    }
+
     if (mr == &ram_memory) {
         return;
     }
-- 
1.7.2.5

Re: [Qemu-devel] [PATCH v4 0/6] save/restore on Xen

[Stefano Stabellini]

On Wed, 25 Jan 2012, Stefano Stabellini wrote:
> Hi all,
> this is the fourth version of the Xen save/restore patch series.
> We have been discussing this issue for quite a while on #qemu and
> qemu-devel:
> 
> 
> http://marc.info/?l=qemu-devel&m=132346828427314&w=2
> http://marc.info/?l=qemu-devel&m=132377734605464&w=2
> 
> 
> The principal changes in the this version are:
> 
> - Following Anthony's suggestion I have introduced a new monitor command
> to save the non-ram device state to file.
> 
> - I have also removed the hack not to reset the cirrus videoram on
> restore, because it turns out that the videoram doesn't need to be
> reset in the reset handler at all (tested on Win2K, where the problem
> was found in the first place).
> 

Is everybody happy enough with this series?
Do you have any additional comments?

Re: [Qemu-devel] [PATCH v4 0/6] save/restore on Xen

[Stefano Stabellini]

On Tue, 31 Jan 2012, Stefano Stabellini wrote:
> On Wed, 25 Jan 2012, Stefano Stabellini wrote:
> > Hi all,
> > this is the fourth version of the Xen save/restore patch series.
> > We have been discussing this issue for quite a while on #qemu and
> > qemu-devel:
> > 
> > 
> > http://marc.info/?l=qemu-devel&m=132346828427314&w=2
> > http://marc.info/?l=qemu-devel&m=132377734605464&w=2
> > 
> > 
> > The principal changes in the this version are:
> > 
> > - Following Anthony's suggestion I have introduced a new monitor command
> > to save the non-ram device state to file.
> > 
> > - I have also removed the hack not to reset the cirrus videoram on
> > restore, because it turns out that the videoram doesn't need to be
> > reset in the reset handler at all (tested on Win2K, where the problem
> > was found in the first place).
> > 
> 
> Is everybody happy enough with this series?
> Do you have any additional comments?
> 

ping

Re: [Qemu-devel] [PATCH v4 0/6] save/restore on Xen

[Stefano Stabellini]

On Mon, 13 Feb 2012, Stefano Stabellini wrote:
> On Tue, 31 Jan 2012, Stefano Stabellini wrote:
> > On Wed, 25 Jan 2012, Stefano Stabellini wrote:
> > > Hi all,
> > > this is the fourth version of the Xen save/restore patch series.
> > > We have been discussing this issue for quite a while on #qemu and
> > > qemu-devel:
> > > 
> > > 
> > > http://marc.info/?l=qemu-devel&m=132346828427314&w=2
> > > http://marc.info/?l=qemu-devel&m=132377734605464&w=2
> > > 
> > > 
> > > The principal changes in the this version are:
> > > 
> > > - Following Anthony's suggestion I have introduced a new monitor command
> > > to save the non-ram device state to file.
> > > 
> > > - I have also removed the hack not to reset the cirrus videoram on
> > > restore, because it turns out that the videoram doesn't need to be
> > > reset in the reset handler at all (tested on Win2K, where the problem
> > > was found in the first place).
> > > 
> > 
> > Is everybody happy enough with this series?
> > Do you have any additional comments?
> > 
> 
> ping
> 

Can we at least agree on the basic approach (especially for patch #1,
#2 and #5 that are not xen specific), so that we can check in the
libxl side of the series?
It is currently blocking other patch series from being merged into
xen-unstable.