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[Xen-devel] [PATCH 2/2] libxl: save/restore qemu's physmap



Read Qemu's physmap from xenstore and save it using toolstack_save.
Restore Qemu's physmap using toolstack_restore.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
 tools/libxl/libxl_dom.c |  132 ++++++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 131 insertions(+), 1 deletions(-)

diff --git a/tools/libxl/libxl_dom.c b/tools/libxl/libxl_dom.c
index fd2b051..3d60a35 100644
--- a/tools/libxl/libxl_dom.c
+++ b/tools/libxl/libxl_dom.c
@@ -347,6 +347,62 @@ out:
     return rc;
 }
 
+static int libxl__toolstack_restore(uint32_t domid, uint8_t *buf,
+        uint32_t size, void *data)
+{
+    libxl__gc *gc = (libxl__gc *) data;
+    int i, ret;
+    uint8_t *ptr = buf;
+    uint32_t namelen = 0;
+    char *name = NULL;
+    uint32_t count = 0;
+    uint64_t phys_offset_v = 0, start_addr_v = 0, size_v = 0;
+
+    if (size < sizeof(count))
+        return -1;
+
+    memcpy(&count, ptr, sizeof(count));
+    ptr += sizeof(count);
+ 
+    if (size <
+            sizeof(count) + count * (sizeof(uint64_t) * 3 + sizeof(uint32_t)))
+        return -1;
+
+    for (i = 0; i < count; i++) {
+        memcpy(&namelen, ptr, sizeof(namelen));
+        ptr += sizeof(namelen);
+        if (namelen > 0) {
+            name = (char *)ptr;
+            ptr += namelen;
+        }
+        memcpy(&phys_offset_v, ptr, sizeof(uint64_t));
+        ptr += sizeof(uint64_t);
+        memcpy(&start_addr_v, ptr, sizeof(uint64_t));
+        ptr += sizeof(uint64_t);
+        memcpy(&size_v, ptr, sizeof(uint64_t));
+        ptr += sizeof(uint64_t);
+
+        ret = libxl__xs_write(gc, 0, libxl__sprintf(gc,
+                    
"/local/domain/0/device-model/%d/physmap/%"PRIx64"/start_addr",
+                    domid, phys_offset_v), "%"PRIx64, start_addr_v);
+        if (ret)
+            return -1;
+        ret = libxl__xs_write(gc, 0, libxl__sprintf(gc,
+                    "/local/domain/0/device-model/%d/physmap/%"PRIx64"/size",
+                    domid, phys_offset_v), "%"PRIx64, size_v);
+        if (ret)
+            return -1;
+        if (namelen > 0) {
+            ret = libxl__xs_write(gc, 0, libxl__sprintf(gc,
+                        
"/local/domain/0/device-model/%d/physmap/%"PRIx64"/name",
+                        domid, phys_offset_v), "%s", name);
+            if (ret)
+                return -1;
+        }
+    }
+    return 0;
+}
+
 int libxl__domain_restore_common(libxl__gc *gc, uint32_t domid,
                                  libxl_domain_build_info *info,
                                  libxl__domain_build_state *state,
@@ -356,11 +412,14 @@ int libxl__domain_restore_common(libxl__gc *gc, uint32_t 
domid,
     /* read signature */
     int rc;
     int hvm, pae, superpages;
+    struct restore_callbacks callbacks;
     switch (info->type) {
     case LIBXL_DOMAIN_TYPE_HVM:
         hvm = 1;
         superpages = 1;
         pae = info->u.hvm.pae;
+        callbacks.toolstack_restore = libxl__toolstack_restore;
+        callbacks.data = gc;
         break;
     case LIBXL_DOMAIN_TYPE_PV:
         hvm = 0;
@@ -373,7 +432,7 @@ int libxl__domain_restore_common(libxl__gc *gc, uint32_t 
domid,
     rc = xc_domain_restore(ctx->xch, fd, domid,
                            state->store_port, &state->store_mfn,
                            state->console_port, &state->console_mfn,
-                           hvm, pae, superpages, NULL);
+                           hvm, pae, superpages, &callbacks);
     if ( rc ) {
         LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR, "restoring domain");
         return ERROR_FAIL;
@@ -528,6 +587,76 @@ static int libxl__domain_suspend_common_callback(void 
*data)
     return 0;
 }
 
+static int libxl__toolstack_save(uint32_t domid, uint8_t **buf,
+        uint32_t *len, void *data)
+{
+    struct suspendinfo *si = (struct suspendinfo *) data;
+    libxl__gc *gc = (libxl__gc *) si->gc;
+    char *start_addr = NULL, *size = NULL, *phys_offset = NULL, *name = NULL;
+    int i = 0;
+    unsigned int num = 0;
+    uint32_t count = 0;
+    uint8_t *ptr = NULL;
+    char **entries = NULL;
+    uint64_t val = 0;
+    uint32_t namelen = 0;
+
+    entries = libxl__xs_directory(gc, 0, libxl__sprintf(gc,
+                "/local/domain/0/device-model/%d/physmap", domid), &num);
+    count = num;
+
+    *len = sizeof(count) + count * (sizeof(val) * 3 + sizeof(namelen));
+    *buf = libxl__calloc(gc, 1, *len);
+    ptr = *buf;
+
+    memcpy(ptr, &count, sizeof(count));
+    ptr += sizeof(count);
+
+    for (i = 0; i < count; i++) {
+        phys_offset = entries[i];
+        start_addr = libxl__xs_read(gc, 0, libxl__sprintf(gc,
+                    "/local/domain/0/device-model/%d/physmap/%s/start_addr",
+                    domid, phys_offset));
+        size = libxl__xs_read(gc, 0, libxl__sprintf(gc,
+                    "/local/domain/0/device-model/%d/physmap/%s/size",
+                    domid, phys_offset));
+        name = libxl__xs_read(gc, 0, libxl__sprintf(gc,
+                    "/local/domain/0/device-model/%d/physmap/%s/name",
+                    domid, phys_offset));
+
+        if (start_addr == NULL || size == NULL || phys_offset == NULL)
+            return -1;
+
+        if (name == NULL) {
+            namelen = 0;
+        } else {
+            unsigned long offset;
+            namelen = strlen(name) + 1;
+            *len += namelen;
+            offset = ptr - (*buf);
+            *buf = libxl__realloc(gc, *buf, *len);
+            ptr = (*buf) + offset;
+        }
+        memcpy(ptr, &namelen, sizeof(namelen));
+        ptr += sizeof(namelen);
+        if (namelen > 0) {
+            memcpy(ptr, name, namelen);
+            ptr += namelen;
+        }
+        val = strtoll(phys_offset, NULL, 16);
+        memcpy(ptr, &val, sizeof(val));
+        ptr += sizeof(val);
+        val = strtoll(start_addr, NULL, 16);
+        memcpy(ptr, &val, sizeof(val));
+        ptr += sizeof(val);
+        val = strtoll(size, NULL, 16);
+        memcpy(ptr, &val, sizeof(val));
+        ptr += sizeof(val);
+    }
+
+    return 0;
+}
+
 int libxl__domain_suspend_common(libxl__gc *gc, uint32_t domid, int fd,
                                  libxl_domain_type type,
                                  int live, int debug)
@@ -579,6 +708,7 @@ int libxl__domain_suspend_common(libxl__gc *gc, uint32_t 
domid, int fd,
     memset(&callbacks, 0, sizeof(callbacks));
     callbacks.suspend = libxl__domain_suspend_common_callback;
     callbacks.switch_qemu_logdirty = 
libxl__domain_suspend_common_switch_qemu_logdirty;
+    callbacks.toolstack_save = libxl__toolstack_save;
     callbacks.data = &si;
 
     rc = xc_domain_save(ctx->xch, fd, domid, 0, 0, flags, &callbacks, hvm);
-- 
1.7.2.5


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