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[Xen-devel] [PATCH] Add code to track the address of the VM generation id buffer across a



# HG changeset patch
# User Paul Durrant <paul.durrant@xxxxxxxxxx>
# Date 1322686267 0
# Node ID 94a17182f386c8bb414eba55dddf763b8982c76d
# Parent  3c4c29899d8a2a0c0f9109b7236da95bb72b77b6
Add code to track the address of the VM generation id buffer across a
save/restore or migrate and inject a new value.
The address of the buffer is written into xenstore by hvmloader at
boot time. It must be read from xenstore by the caller of
xc_domain_save() and then written back again by the caller of
xc_domain_restore().

Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>

diff -r 3c4c29899d8a -r 94a17182f386 tools/libxc/ia64/xc_ia64_linux_restore.c
--- a/tools/libxc/ia64/xc_ia64_linux_restore.c  Wed Nov 30 07:18:11 2011 -0800
+++ b/tools/libxc/ia64/xc_ia64_linux_restore.c  Wed Nov 30 20:51:07 2011 +0000
@@ -548,7 +548,8 @@ int
 xc_domain_restore(xc_interface *xch, int io_fd, uint32_t dom,
                   unsigned int store_evtchn, unsigned long *store_mfn,
                   unsigned int console_evtchn, unsigned long *console_mfn,
-                  unsigned int hvm, unsigned int pae, int superpages)
+                  unsigned int hvm, unsigned int pae, int superpages,
+                  uint64_t gid)
 {
     DECLARE_DOMCTL;
     int rc = 1;
diff -r 3c4c29899d8a -r 94a17182f386 tools/libxc/ia64/xc_ia64_linux_save.c
--- a/tools/libxc/ia64/xc_ia64_linux_save.c     Wed Nov 30 07:18:11 2011 -0800
+++ b/tools/libxc/ia64/xc_ia64_linux_save.c     Wed Nov 30 20:51:07 2011 +0000
@@ -382,7 +382,8 @@ out:
 int
 xc_domain_save(xc_interface *xch, int io_fd, uint32_t dom, uint32_t max_iters,
                uint32_t max_factor, uint32_t flags,
-               struct save_callbacks* callbacks, int hvm)
+               struct save_callbacks* callbacks, int hvm,
+               unsigned long vm_gid_addr)
 {
     DECLARE_DOMCTL;
     xc_dominfo_t info;
diff -r 3c4c29899d8a -r 94a17182f386 tools/libxc/xc_domain_restore.c
--- a/tools/libxc/xc_domain_restore.c   Wed Nov 30 07:18:11 2011 -0800
+++ b/tools/libxc/xc_domain_restore.c   Wed Nov 30 20:51:07 2011 +0000
@@ -676,6 +676,7 @@ typedef struct {
     uint64_t console_pfn;
     uint64_t acpi_ioport_location;
     uint64_t viridian;
+    uint64_t vm_gid_addr;
 } pagebuf_t;
 
 static int pagebuf_init(pagebuf_t* buf)
@@ -820,6 +821,17 @@ static int pagebuf_get_one(xc_interface 
         }
         return pagebuf_get_one(xch, ctx, buf, fd, dom);
 
+    case XC_SAVE_ID_HVM_GENERATION_ID_ADDR:
+        /* Skip padding 4 bytes then read the generation id buffer location. */
+        if ( RDEXACT(fd, &buf->vm_gid_addr, sizeof(uint32_t)) ||
+             RDEXACT(fd, &buf->vm_gid_addr, sizeof(uint64_t)) )
+        {
+            PERROR("error read the generation id buffer location");
+            return -1;
+        }
+        DPRINTF("read generation id buffer address");
+        return pagebuf_get_one(xch, ctx, buf, fd, dom);
+
     default:
         if ( (count > MAX_BATCH_SIZE) || (count < 0) ) {
             ERROR("Max batch size exceeded (%d). Giving up.", count);
@@ -1186,7 +1198,8 @@ static int apply_batch(xc_interface *xch
 int xc_domain_restore(xc_interface *xch, int io_fd, uint32_t dom,
                       unsigned int store_evtchn, unsigned long *store_mfn,
                       unsigned int console_evtchn, unsigned long *console_mfn,
-                      unsigned int hvm, unsigned int pae, int superpages)
+                      unsigned int hvm, unsigned int pae, int superpages,
+                      uint64_t gid, unsigned long *vm_gid_addr)
 {
     DECLARE_DOMCTL;
     int rc = 1, frc, i, j, n, m, pae_extended_cr3 = 0, ext_vcpucontext = 0;
@@ -1386,6 +1399,33 @@ int xc_domain_restore(xc_interface *xch,
                 xc_set_hvm_param(xch, dom, HVM_PARAM_VM86_TSS, 
pagebuf.vm86_tss);
             if ( pagebuf.console_pfn )
                 console_pfn = pagebuf.console_pfn;
+            if ( pagebuf.vm_gid_addr ) {
+                unsigned int offset;
+                unsigned char *buf;
+
+                /*
+                 * Map the VM generation id buffer and inject the new value.
+                 */
+
+                pfn = pagebuf.vm_gid_addr >> PAGE_SHIFT;
+                offset = pagebuf.vm_gid_addr & (PAGE_SIZE - 1);
+            
+                if ( (pfn >= dinfo->p2m_size) ||
+                     (pfn_type[pfn] != XEN_DOMCTL_PFINFO_NOTAB) )
+                {
+                    ERROR("generation id buffer frame is bad");
+                    goto out;
+                }
+
+                mfn = ctx->p2m[pfn];
+                buf = xc_map_foreign_range(xch, dom, PAGE_SIZE,
+                                           PROT_READ | PROT_WRITE, mfn);
+                *(unsigned long long *)(buf + offset) = gid;
+                munmap(buf, PAGE_SIZE);
+
+                *vm_gid_addr = pagebuf.vm_gid_addr;
+            }
+
             break;  /* our work here is done */
         }
 
diff -r 3c4c29899d8a -r 94a17182f386 tools/libxc/xc_domain_save.c
--- a/tools/libxc/xc_domain_save.c      Wed Nov 30 07:18:11 2011 -0800
+++ b/tools/libxc/xc_domain_save.c      Wed Nov 30 20:51:07 2011 +0000
@@ -754,7 +754,8 @@ static int save_tsc_info(xc_interface *x
 
 int xc_domain_save(xc_interface *xch, int io_fd, uint32_t dom, uint32_t 
max_iters,
                    uint32_t max_factor, uint32_t flags,
-                   struct save_callbacks* callbacks, int hvm)
+                   struct save_callbacks* callbacks, int hvm,
+                   unsigned long vm_gid_addr)
 {
     xc_dominfo_t info;
     DECLARE_DOMCTL;
@@ -1460,6 +1461,16 @@ int xc_domain_save(xc_interface *xch, in
             uint64_t data;
         } chunk = { 0, };
 
+        chunk.id = XC_SAVE_ID_HVM_GENERATION_ID_ADDR;
+        chunk.data = vm_gid_addr;
+
+        if ( (chunk.data != 0) &&
+             wrexact(io_fd, &chunk, sizeof(chunk)) )
+        {
+            PERROR("Error when writing the generation id buffer location for 
guest");
+            goto out;
+        }
+
         chunk.id = XC_SAVE_ID_HVM_IDENT_PT;
         chunk.data = 0;
         xc_get_hvm_param(xch, dom, HVM_PARAM_IDENT_PT,
diff -r 3c4c29899d8a -r 94a17182f386 tools/libxc/xenguest.h
--- a/tools/libxc/xenguest.h    Wed Nov 30 07:18:11 2011 -0800
+++ b/tools/libxc/xenguest.h    Wed Nov 30 20:51:07 2011 +0000
@@ -57,7 +57,8 @@ struct save_callbacks {
  */
 int xc_domain_save(xc_interface *xch, int io_fd, uint32_t dom, uint32_t 
max_iters,
                    uint32_t max_factor, uint32_t flags /* XCFLAGS_xxx */,
-                   struct save_callbacks* callbacks, int hvm);
+                   struct save_callbacks* callbacks, int hvm,
+                   unsigned long vm_gid_addr);
 
 
 /**
@@ -71,12 +72,15 @@ int xc_domain_save(xc_interface *xch, in
  * @parm hvm non-zero if this is a HVM restore
  * @parm pae non-zero if this HVM domain has PAE support enabled
  * @parm superpages non-zero to allocate guest memory with superpages
+ * @parm gid the new generation id of the VM
+ * @parm vm_gid_addr returned with the address of the generation id buffer
  * @return 0 on success, -1 on failure
  */
 int xc_domain_restore(xc_interface *xch, int io_fd, uint32_t dom,
                       unsigned int store_evtchn, unsigned long *store_mfn,
                       unsigned int console_evtchn, unsigned long *console_mfn,
-                      unsigned int hvm, unsigned int pae, int superpages);
+                      unsigned int hvm, unsigned int pae, int superpages,
+                      uint64_t gid, unsigned long *vm_gid_addr);
 /**
  * xc_domain_restore writes a file to disk that contains the device
  * model saved state.
diff -r 3c4c29899d8a -r 94a17182f386 tools/libxc/xg_save_restore.h
--- a/tools/libxc/xg_save_restore.h     Wed Nov 30 07:18:11 2011 -0800
+++ b/tools/libxc/xg_save_restore.h     Wed Nov 30 20:51:07 2011 +0000
@@ -135,6 +135,7 @@
 #define XC_SAVE_ID_LAST_CHECKPOINT    -9 /* Commit to restoring after 
completion of current iteration. */
 #define XC_SAVE_ID_HVM_ACPI_IOPORTS_LOCATION -10
 #define XC_SAVE_ID_HVM_VIRIDIAN       -11
+#define XC_SAVE_ID_HVM_GENERATION_ID_ADDR -12
 
 /*
 ** We process save/restore/migrate in batches of pages; the below
diff -r 3c4c29899d8a -r 94a17182f386 tools/libxl/libxl_create.c
--- a/tools/libxl/libxl_create.c        Wed Nov 30 07:18:11 2011 -0800
+++ b/tools/libxl/libxl_create.c        Wed Nov 30 20:51:07 2011 +0000
@@ -101,6 +101,7 @@ int libxl_init_build_info(libxl_ctx *ctx
         b_info->u.hvm.vpt_align = 1;
         b_info->u.hvm.timer_mode = 1;
         b_info->u.hvm.nested_hvm = 0;
+        b_info->u.hvm.generation_id = 0;
         break;
     case LIBXL_DOMAIN_TYPE_PV:
         b_info->u.pv.slack_memkb = 8 * 1024;
@@ -191,13 +192,15 @@ int libxl__domain_build(libxl__gc *gc,
         vments[4] = "start_time";
         vments[5] = libxl__sprintf(gc, "%lu.%02d", 
start_time.tv_sec,(int)start_time.tv_usec/10000);
 
-        localents = libxl__calloc(gc, 7, sizeof(char *));
+        localents = libxl__calloc(gc, 9, sizeof(char *));
         localents[0] = "platform/acpi";
         localents[1] = (info->u.hvm.acpi) ? "1" : "0";
         localents[2] = "platform/acpi_s3";
         localents[3] = (info->u.hvm.acpi_s3) ? "1" : "0";
         localents[4] = "platform/acpi_s4";
         localents[5] = (info->u.hvm.acpi_s4) ? "1" : "0";
+        localents[6] = "platform/generation_id";
+        localents[7] = libxl__sprintf(gc, "0x%llx", info->u.hvm.generation_id);
 
         break;
     case LIBXL_DOMAIN_TYPE_PV:
diff -r 3c4c29899d8a -r 94a17182f386 tools/libxl/libxl_dom.c
--- a/tools/libxl/libxl_dom.c   Wed Nov 30 07:18:11 2011 -0800
+++ b/tools/libxl/libxl_dom.c   Wed Nov 30 20:51:07 2011 +0000
@@ -125,7 +125,7 @@ int libxl__build_post(libxl__gc *gc, uin
     if (info->cpuid != NULL)
         libxl_cpuid_set(ctx, domid, info->cpuid);
 
-    ents = libxl__calloc(gc, 12 + (info->max_vcpus * 2) + 2, sizeof(char *));
+    ents = libxl__calloc(gc, 14 + (info->max_vcpus * 2) + 2, sizeof(char *));
     ents[0] = "memory/static-max";
     ents[1] = libxl__sprintf(gc, "%d", info->max_memkb);
     ents[2] = "memory/target";
@@ -138,9 +138,11 @@ int libxl__build_post(libxl__gc *gc, uin
     ents[9] = libxl__sprintf(gc, "%"PRIu32, state->store_port);
     ents[10] = "store/ring-ref";
     ents[11] = libxl__sprintf(gc, "%lu", state->store_mfn);
+    ents[12] = "data/generation-id";
+    ents[13] = libxl__sprintf(gc, "0x%lx", state->vm_gid_addr);
     for (i = 0; i < info->max_vcpus; i++) {
-        ents[12+(i*2)]   = libxl__sprintf(gc, "cpu/%d/availability", i);
-        ents[12+(i*2)+1] = (i && info->cur_vcpus && !(info->cur_vcpus & (1 << 
i)))
+        ents[14+(i*2)]   = libxl__sprintf(gc, "cpu/%d/availability", i);
+        ents[14+(i*2)+1] = (i && info->cur_vcpus && !(info->cur_vcpus & (1 << 
i)))
                             ? "offline" : "online";
     }
 
@@ -357,16 +359,19 @@ int libxl__domain_restore_common(libxl__
     /* read signature */
     int rc;
     int hvm, pae, superpages;
+    uint64_t gid;
     switch (info->type) {
     case LIBXL_DOMAIN_TYPE_HVM:
         hvm = 1;
         superpages = 1;
         pae = info->u.hvm.pae;
+        gid = info->u.hvm.generation_id;
         break;
     case LIBXL_DOMAIN_TYPE_PV:
         hvm = 0;
         superpages = 0;
         pae = 1;
+        gid = 0;
         break;
     default:
         return ERROR_INVAL;
@@ -374,7 +379,7 @@ int libxl__domain_restore_common(libxl__
     rc = xc_domain_restore(ctx->xch, fd, domid,
                            state->store_port, &state->store_mfn,
                            state->console_port, &state->console_mfn,
-                           hvm, pae, superpages);
+                           hvm, pae, superpages, gid, &state->vm_gid_addr);
     if ( rc ) {
         LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR, "restoring domain");
         return ERROR_FAIL;
@@ -540,12 +545,22 @@ int libxl__domain_suspend_common(libxl__
     struct save_callbacks callbacks;
     struct suspendinfo si;
     int hvm, rc = ERROR_FAIL;
+    unsigned long vm_gid_addr;
 
     switch (type) {
-    case LIBXL_DOMAIN_TYPE_HVM:
+    case LIBXL_DOMAIN_TYPE_HVM: {
+        char *path;
+        char *addr;
+
+        path = libxl__sprintf(gc, "%s/data/generation-id", 
libxl__xs_get_dompath(gc, domid));
+        addr = libxl__xs_read(gc, XBT_NULL, path);
+
+        vm_gid_addr = (addr) ? strtoul(addr, NULL, 0) : 0;
         hvm = 1;
         break;
+    }
     case LIBXL_DOMAIN_TYPE_PV:
+        vm_gid_addr = 0;
         hvm = 0;
         break;
     default:
@@ -583,7 +598,8 @@ int libxl__domain_suspend_common(libxl__
     callbacks.switch_qemu_logdirty = 
libxl__domain_suspend_common_switch_qemu_logdirty;
     callbacks.data = &si;
 
-    rc = xc_domain_save(ctx->xch, fd, domid, 0, 0, flags, &callbacks, hvm);
+    rc = xc_domain_save(ctx->xch, fd, domid, 0, 0, flags, &callbacks,
+                        hvm, vm_gid_addr);
     if ( rc ) {
         LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR, "saving domain: %s",
                          si.guest_responded ?
diff -r 3c4c29899d8a -r 94a17182f386 tools/libxl/libxl_internal.h
--- a/tools/libxl/libxl_internal.h      Wed Nov 30 07:18:11 2011 -0800
+++ b/tools/libxl/libxl_internal.h      Wed Nov 30 20:51:07 2011 +0000
@@ -199,6 +199,8 @@ typedef struct {
 
     uint32_t console_port;
     unsigned long console_mfn;
+
+    unsigned long vm_gid_addr;
 } libxl__domain_build_state;
 
 _hidden int libxl__build_pre(libxl__gc *gc, uint32_t domid,
diff -r 3c4c29899d8a -r 94a17182f386 tools/libxl/libxl_types.idl
--- a/tools/libxl/libxl_types.idl       Wed Nov 30 07:18:11 2011 -0800
+++ b/tools/libxl/libxl_types.idl       Wed Nov 30 20:51:07 2011 +0000
@@ -183,6 +183,7 @@ libxl_domain_build_info = Struct("domain
                                        ("vpt_align", bool),
                                        ("timer_mode", integer),
                                        ("nested_hvm", bool),
+                                       ("generation_id", uint64),
                                        ])),
                  ("pv", Struct(None, [("kernel", libxl_file_reference),
                                       ("slack_memkb", uint32),
diff -r 3c4c29899d8a -r 94a17182f386 tools/libxl/libxlu_cfg.c
--- a/tools/libxl/libxlu_cfg.c  Wed Nov 30 07:18:11 2011 -0800
+++ b/tools/libxl/libxlu_cfg.c  Wed Nov 30 20:51:07 2011 +0000
@@ -235,6 +235,37 @@ int xlu_cfg_get_long(const XLU_Config *c
     return 0;
 }
 
+int xlu_cfg_get_long_long(const XLU_Config *cfg, const char *n,
+                          long long *value_r, int dont_warn) {
+    long long ll;
+    XLU_ConfigSetting *set;
+    int e;
+    char *ep;
+
+    e= find_atom(cfg,n,&set,dont_warn);  if (e) return e;
+    errno= 0; ll= strtoll(set->values[0], &ep, 0);
+    e= errno;
+    if (errno) {
+        e= errno;
+        assert(e==EINVAL || e==ERANGE);
+        if (!dont_warn)
+            fprintf(cfg->report,
+                    "%s:%d: warning: parameter `%s' could not be parsed"
+                    " as a number: %s\n",
+                    cfg->filename, set->lineno, n, strerror(e));
+        return e;
+    }
+    if (*ep || ep==set->values[0]) {
+        if (!dont_warn)
+            fprintf(cfg->report,
+                    "%s:%d: warning: parameter `%s' is not a valid number\n",
+                    cfg->filename, set->lineno, n);
+        return EINVAL;
+    }
+    *value_r= ll;
+    return 0;
+}
+
 
 int xlu_cfg_get_list(const XLU_Config *cfg, const char *n,
                      XLU_ConfigList **list_r, int *entries_r, int dont_warn) {
diff -r 3c4c29899d8a -r 94a17182f386 tools/libxl/libxlutil.h
--- a/tools/libxl/libxlutil.h   Wed Nov 30 07:18:11 2011 -0800
+++ b/tools/libxl/libxlutil.h   Wed Nov 30 20:51:07 2011 +0000
@@ -52,6 +52,8 @@ int xlu_cfg_replace_string(const XLU_Con
                            char **value_r, int dont_warn);
 int xlu_cfg_get_long(const XLU_Config*, const char *n, long *value_r,
                      int dont_warn);
+int xlu_cfg_get_long_long(const XLU_Config*, const char *n, long long *value_r,
+                          int dont_warn);
 
 int xlu_cfg_get_list(const XLU_Config*, const char *n,
                      XLU_ConfigList **list_r /* may be 0 */,
diff -r 3c4c29899d8a -r 94a17182f386 tools/libxl/xl_cmdimpl.c
--- a/tools/libxl/xl_cmdimpl.c  Wed Nov 30 07:18:11 2011 -0800
+++ b/tools/libxl/xl_cmdimpl.c  Wed Nov 30 20:51:07 2011 +0000
@@ -573,6 +573,7 @@ static void parse_config_data(const char
 {
     const char *buf;
     long l;
+    long long ll;
     XLU_Config *config;
     XLU_ConfigList *vbds, *nics, *pcis, *cvfbs, *cpuids;
     int pci_power_mgmt = 0;
@@ -764,6 +765,8 @@ static void parse_config_data(const char
             b_info->u.hvm.timer_mode = l;
         if (!xlu_cfg_get_long (config, "nestedhvm", &l, 0))
             b_info->u.hvm.nested_hvm = l;
+        if (!xlu_cfg_get_long_long (config, "generation_id", &ll, 0))
+            b_info->u.hvm.nested_hvm = ll;
         break;
     case LIBXL_DOMAIN_TYPE_PV:
     {
diff -r 3c4c29899d8a -r 94a17182f386 
tools/python/xen/lowlevel/checkpoint/libcheckpoint.c
--- a/tools/python/xen/lowlevel/checkpoint/libcheckpoint.c      Wed Nov 30 
07:18:11 2011 -0800
+++ b/tools/python/xen/lowlevel/checkpoint/libcheckpoint.c      Wed Nov 30 
20:51:07 2011 +0000
@@ -174,6 +174,7 @@ int checkpoint_start(checkpoint_state* s
 {
     int hvm, rc;
     int flags = XCFLAGS_LIVE;
+    unsigned long vm_gid_addr;
 
     if (!s->domid) {
        s->errstr = "checkpoint state not opened";
@@ -184,14 +185,25 @@ int checkpoint_start(checkpoint_state* s
 
     hvm = s->domtype > dt_pv;
     if (hvm) {
+       char path[128];
+       char *addr;
+
+       sprintf(path, "/local/domain/%u/data/generation-id", s->domid);
+       addr = xs_read(s->xsh, XBT_NULL, path, NULL);
+
+       vm_gid_addr = (addr) ? strtoul(addr, NULL, 0) : 0;
+       free(addr);
+
        flags |= XCFLAGS_HVM;
        if (switch_qemu_logdirty(s, 1))
            return -1;
+    } else {
+       vm_gid_addr = 0;
     }
 
     callbacks->switch_qemu_logdirty = noop_switch_logdirty;
 
-    rc = xc_domain_save(s->xch, fd, s->domid, 0, 0, flags, callbacks, hvm);
+    rc = xc_domain_save(s->xch, fd, s->domid, 0, 0, flags, callbacks, hvm, 
vm_gid_addr);
 
     if (hvm)
        switch_qemu_logdirty(s, 0);
diff -r 3c4c29899d8a -r 94a17182f386 tools/xcutils/xc_restore.c
--- a/tools/xcutils/xc_restore.c        Wed Nov 30 07:18:11 2011 -0800
+++ b/tools/xcutils/xc_restore.c        Wed Nov 30 20:51:07 2011 +0000
@@ -23,7 +23,8 @@ main(int argc, char **argv)
     xc_interface *xch;
     int io_fd, ret;
     int superpages;
-    unsigned long store_mfn, console_mfn;
+    unsigned long store_mfn, console_mfn, vm_gid_addr;
+    uint64_t gid;
 
     if ( (argc != 8) && (argc != 9) )
         errx(1, "usage: %s iofd domid store_evtchn "
@@ -40,19 +41,25 @@ main(int argc, char **argv)
     hvm  = atoi(argv[5]);
     pae  = atoi(argv[6]);
     apic = atoi(argv[7]);
-    if ( argc == 9 )
+    if ( argc >= 9 )
            superpages = atoi(argv[8]);
     else
            superpages = !!hvm;
+    if ( argc >= 10 )
+           gid = strtoll(argv[9], NULL, 0);
+    else
+           gid = 0;
 
     ret = xc_domain_restore(xch, io_fd, domid, store_evtchn, &store_mfn,
-                            console_evtchn, &console_mfn, hvm, pae, 
superpages);
+                            console_evtchn, &console_mfn, hvm, pae, superpages,
+                            gid, &vm_gid_addr);
 
     if ( ret == 0 )
     {
        printf("store-mfn %li\n", store_mfn);
         if ( !hvm )
             printf("console-mfn %li\n", console_mfn);
+       printf("vm-gid-addr %lx\n", vm_gid_addr);
        fflush(stdout);
     }
 
diff -r 3c4c29899d8a -r 94a17182f386 tools/xcutils/xc_save.c
--- a/tools/xcutils/xc_save.c   Wed Nov 30 07:18:11 2011 -0800
+++ b/tools/xcutils/xc_save.c   Wed Nov 30 20:51:07 2011 +0000
@@ -169,6 +169,10 @@ main(int argc, char **argv)
     unsigned int maxit, max_f;
     int io_fd, ret, port;
     struct save_callbacks callbacks;
+    char path[128];
+    struct xs_handle *xs;
+    char *addr;
+    unsigned long vm_gid_addr;
 
     if (argc != 6)
         errx(1, "usage: %s iofd domid maxit maxf flags", argv[0]);
@@ -207,8 +211,21 @@ main(int argc, char **argv)
     memset(&callbacks, 0, sizeof(callbacks));
     callbacks.suspend = suspend;
     callbacks.switch_qemu_logdirty = switch_qemu_logdirty;
+
+    sprintf(path, "/local/domain/%d/data/generation-id", si.domid);
+
+    if ((xs = xs_daemon_open()) == NULL)
+        errx(1, "Couldn't contact xenstore");
+
+    addr = xs_read(xs, XBT_NULL, path, NULL);
+
+    xs_daemon_close(xs);
+
+    vm_gid_addr = (addr) ? strtoul(addr, NULL, 0) : 0;
+    free(addr);
+
     ret = xc_domain_save(si.xch, io_fd, si.domid, maxit, max_f, si.flags, 
-                         &callbacks, !!(si.flags & XCFLAGS_HVM));
+                         &callbacks, !!(si.flags & XCFLAGS_HVM), vm_gid_addr);
 
     if (si.suspend_evtchn > 0)
         xc_suspend_evtchn_release(si.xch, si.xce, si.domid, si.suspend_evtchn);

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