[PATCH v2 08/15] qemu: migration_cookie: Add XML handling for setting up bitmap migration
Peter Krempa
pkrempa at redhat.com
Fri Feb 19 11:58:20 UTC 2021
In cases where we are copying the storage we need to ensure that also
bitmaps are copied properly. This patch adds migration cookie XML
infrastructure which will allow the migration sides reach consensus on
which bitmaps to migrate.
Signed-off-by: Peter Krempa <pkrempa at redhat.com>
Reviewed-by: Jiri Denemark <jdenemar at redhat.com>
---
src/qemu/qemu_migration_cookie.c | 146 +++++++++++++++++++++++++++++++
src/qemu/qemu_migration_cookie.h | 34 +++++++
2 files changed, 180 insertions(+)
diff --git a/src/qemu/qemu_migration_cookie.c b/src/qemu/qemu_migration_cookie.c
index 6f2b1b2f57..0f8555cbb0 100644
--- a/src/qemu/qemu_migration_cookie.c
+++ b/src/qemu/qemu_migration_cookie.c
@@ -51,6 +51,7 @@ VIR_ENUM_IMPL(qemuMigrationCookieFlag,
"cpu",
"allowReboot",
"capabilities",
+ "block-dirty-bitmaps",
);
@@ -116,6 +117,39 @@ qemuMigrationCookieCapsFree(qemuMigrationCookieCapsPtr caps)
G_DEFINE_AUTOPTR_CLEANUP_FUNC(qemuMigrationCookieCaps,
qemuMigrationCookieCapsFree);
+static void
+qemuMigrationBlockDirtyBitmapsDiskBitmapFree(qemuMigrationBlockDirtyBitmapsDiskBitmapPtr bmp)
+{
+ if (!bmp)
+ return;
+
+ g_free(bmp->bitmapname);
+ g_free(bmp->alias);
+ g_free(bmp->sourcebitmap);
+ g_free(bmp);
+}
+
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(qemuMigrationBlockDirtyBitmapsDiskBitmap,
+ qemuMigrationBlockDirtyBitmapsDiskBitmapFree);
+
+
+static void
+qemuMigrationBlockDirtyBitmapsDiskFree(qemuMigrationBlockDirtyBitmapsDiskPtr dsk)
+{
+ if (!dsk)
+ return;
+
+ g_free(dsk->target);
+ if (dsk->bitmaps)
+ g_slist_free_full(dsk->bitmaps,
+ (GDestroyNotify) qemuMigrationBlockDirtyBitmapsDiskBitmapFree);
+ g_free(dsk);
+}
+
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(qemuMigrationBlockDirtyBitmapsDisk,
+ qemuMigrationBlockDirtyBitmapsDiskFree);
+
+
void
qemuMigrationCookieFree(qemuMigrationCookiePtr mig)
{
@@ -135,6 +169,9 @@ qemuMigrationCookieFree(qemuMigrationCookiePtr mig)
g_clear_pointer(&mig->jobInfo, qemuDomainJobInfoFree);
virCPUDefFree(mig->cpu);
qemuMigrationCookieCapsFree(mig->caps);
+ if (mig->blockDirtyBitmaps)
+ g_slist_free_full(mig->blockDirtyBitmaps,
+ (GDestroyNotify) qemuMigrationBlockDirtyBitmapsDiskFree);
g_free(mig);
}
@@ -758,6 +795,48 @@ qemuMigrationCookieNBDXMLFormat(qemuMigrationCookieNBDPtr nbd,
}
+static void
+qemuMigrationCookieBlockDirtyBitmapsFormat(virBufferPtr buf,
+ GSList *bitmaps)
+{
+ g_auto(virBuffer) disksBuf = VIR_BUFFER_INIT_CHILD(buf);
+ GSList *nextdisk;
+
+ for (nextdisk = bitmaps; nextdisk; nextdisk = nextdisk->next) {
+ qemuMigrationBlockDirtyBitmapsDiskPtr disk = nextdisk->data;
+ g_auto(virBuffer) diskAttrBuf = VIR_BUFFER_INITIALIZER;
+ g_auto(virBuffer) diskChildBuf = VIR_BUFFER_INIT_CHILD(&disksBuf);
+ bool hasBitmaps = false;
+ GSList *nextbitmap;
+
+ if (disk->skip || !disk->bitmaps)
+ continue;
+
+ for (nextbitmap = disk->bitmaps; nextbitmap; nextbitmap = nextbitmap->next) {
+ qemuMigrationBlockDirtyBitmapsDiskBitmapPtr bitmap = nextbitmap->data;
+
+ if (bitmap->skip)
+ continue;
+
+ virBufferAsprintf(&diskChildBuf,
+ "<bitmap name='%s' alias='%s'/>\n",
+ bitmap->bitmapname, bitmap->alias);
+
+ hasBitmaps = true;
+ }
+
+ if (!hasBitmaps)
+ continue;
+
+ virBufferAsprintf(&diskAttrBuf, " target='%s'", disk->target);
+ virXMLFormatElement(&disksBuf, "disk", &diskAttrBuf, &diskChildBuf);
+ }
+
+
+ virXMLFormatElement(buf, "blockDirtyBitmaps", NULL, &disksBuf);
+}
+
+
int
qemuMigrationCookieXMLFormat(virQEMUDriverPtr driver,
virQEMUCapsPtr qemuCaps,
@@ -829,6 +908,9 @@ qemuMigrationCookieXMLFormat(virQEMUDriverPtr driver,
if (mig->flags & QEMU_MIGRATION_COOKIE_CAPS)
qemuMigrationCookieCapsXMLFormat(buf, mig->caps);
+ if (mig->flags & QEMU_MIGRATION_COOKIE_BLOCK_DIRTY_BITMAPS)
+ qemuMigrationCookieBlockDirtyBitmapsFormat(buf, mig->blockDirtyBitmaps);
+
virBufferAdjustIndent(buf, -2);
virBufferAddLit(buf, "</qemu-migration>\n");
return 0;
@@ -1132,6 +1214,65 @@ qemuMigrationCookieXMLParseMandatoryFeatures(xmlXPathContextPtr ctxt,
}
+static int
+qemuMigrationCookieBlockDirtyBitmapsParse(xmlXPathContextPtr ctxt,
+ qemuMigrationCookiePtr mig)
+{
+ g_autoslist(qemuMigrationBlockDirtyBitmapsDisk) disks = NULL;
+ g_autofree xmlNodePtr *disknodes = NULL;
+ int ndisknodes;
+ size_t i;
+ VIR_XPATH_NODE_AUTORESTORE(ctxt)
+
+ if ((ndisknodes = virXPathNodeSet("./blockDirtyBitmaps/disk", ctxt, &disknodes)) < 0)
+ return -1;
+
+ for (i = 0; i < ndisknodes; i++) {
+ g_autoslist(qemuMigrationBlockDirtyBitmapsDiskBitmap) bitmaps = NULL;
+ qemuMigrationBlockDirtyBitmapsDiskPtr disk;
+ g_autofree xmlNodePtr *bitmapnodes = NULL;
+ int nbitmapnodes;
+ size_t j;
+
+ ctxt->node = disknodes[i];
+
+ if ((nbitmapnodes = virXPathNodeSet("./bitmap", ctxt, &bitmapnodes)) < 0)
+ return -1;
+
+ for (j = 0; j < nbitmapnodes; j++) {
+ qemuMigrationBlockDirtyBitmapsDiskBitmapPtr bitmap;
+
+ bitmap = g_new0(qemuMigrationBlockDirtyBitmapsDiskBitmap, 1);
+ bitmap->bitmapname = virXMLPropString(bitmapnodes[j], "name");
+ bitmap->alias = virXMLPropString(bitmapnodes[j], "alias");
+ bitmaps = g_slist_prepend(bitmaps, bitmap);
+
+ if (!bitmap->bitmapname || !bitmap->alias) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("malformed <blockDirtyBitmaps> in migration cookie"));
+ return -1;
+ }
+ }
+
+ disk = g_new0(qemuMigrationBlockDirtyBitmapsDisk, 1);
+ disk->target = virXMLPropString(disknodes[i], "target");
+ disk->bitmaps = g_slist_reverse(g_steal_pointer(&bitmaps));
+
+ disks = g_slist_prepend(disks, disk);
+
+ if (!disk->target) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("malformed <blockDirtyBitmaps> in migration cookie"));
+ return -1;
+ }
+ }
+
+ mig->blockDirtyBitmaps = g_slist_reverse(g_steal_pointer(&disks));
+
+ return 0;
+}
+
+
static int
qemuMigrationCookieXMLParse(qemuMigrationCookiePtr mig,
virQEMUDriverPtr driver,
@@ -1275,6 +1416,11 @@ qemuMigrationCookieXMLParse(qemuMigrationCookiePtr mig,
!(mig->caps = qemuMigrationCookieCapsXMLParse(ctxt)))
return -1;
+ if (flags & QEMU_MIGRATION_COOKIE_BLOCK_DIRTY_BITMAPS &&
+ virXPathBoolean("boolean(./blockDirtyBitmaps)", ctxt) &&
+ qemuMigrationCookieBlockDirtyBitmapsParse(ctxt, mig) < 0)
+ return -1;
+
return 0;
}
diff --git a/src/qemu/qemu_migration_cookie.h b/src/qemu/qemu_migration_cookie.h
index ecd1a01375..8636f955da 100644
--- a/src/qemu/qemu_migration_cookie.h
+++ b/src/qemu/qemu_migration_cookie.h
@@ -35,6 +35,7 @@ typedef enum {
QEMU_MIGRATION_COOKIE_FLAG_CPU,
QEMU_MIGRATION_COOKIE_FLAG_ALLOW_REBOOT,
QEMU_MIGRATION_COOKIE_FLAG_CAPS,
+ QEMU_MIGRATION_COOKIE_FLAG_BLOCK_DIRTY_BITMAPS,
QEMU_MIGRATION_COOKIE_FLAG_LAST
} qemuMigrationCookieFlags;
@@ -53,6 +54,7 @@ typedef enum {
QEMU_MIGRATION_COOKIE_CPU = (1 << QEMU_MIGRATION_COOKIE_FLAG_CPU),
QEMU_MIGRATION_COOKIE_ALLOW_REBOOT = (1 << QEMU_MIGRATION_COOKIE_FLAG_ALLOW_REBOOT),
QEMU_MIGRATION_COOKIE_CAPS = (1 << QEMU_MIGRATION_COOKIE_FLAG_CAPS),
+ QEMU_MIGRATION_COOKIE_BLOCK_DIRTY_BITMAPS = (1 << QEMU_MIGRATION_COOKIE_FLAG_BLOCK_DIRTY_BITMAPS),
} qemuMigrationCookieFeatures;
typedef struct _qemuMigrationCookieGraphics qemuMigrationCookieGraphics;
@@ -107,6 +109,35 @@ struct _qemuMigrationCookieCaps {
virBitmapPtr automatic;
};
+typedef struct _qemuMigrationBlockDirtyBitmapsDiskBitmap qemuMigrationBlockDirtyBitmapsDiskBitmap;
+typedef qemuMigrationBlockDirtyBitmapsDiskBitmap *qemuMigrationBlockDirtyBitmapsDiskBitmapPtr;
+struct _qemuMigrationBlockDirtyBitmapsDiskBitmap {
+ /* config */
+ char *bitmapname;
+ char *alias;
+
+ /* runtime */
+ virTristateBool persistent; /* force persisting of the bitmap */
+ char *sourcebitmap; /* optional, actual bitmap to migrate in case we needed
+ to create a temporary one by merging */
+ bool skip; /* omit this bitmap */
+};
+
+
+typedef struct _qemuMigrationBlockDirtyBitmapsDisk qemuMigrationBlockDirtyBitmapsDisk;
+typedef qemuMigrationBlockDirtyBitmapsDisk *qemuMigrationBlockDirtyBitmapsDiskPtr;
+struct _qemuMigrationBlockDirtyBitmapsDisk {
+ char *target;
+
+ GSList *bitmaps;
+
+ /* runtime data */
+ virDomainDiskDefPtr disk; /* disk object corresponding to 'target' */
+ const char *nodename; /* nodename of the top level source of 'disk' */
+ bool skip; /* omit this disk */
+};
+
+
typedef struct _qemuMigrationCookie qemuMigrationCookie;
typedef qemuMigrationCookie *qemuMigrationCookiePtr;
struct _qemuMigrationCookie {
@@ -150,6 +181,9 @@ struct _qemuMigrationCookie {
/* If flags & QEMU_MIGRATION_COOKIE_CAPS */
qemuMigrationCookieCapsPtr caps;
+
+ /* If flags & QEMU_MIGRATION_COOKIE_BLOCK_DIRTY_BITMAPS */
+ GSList *blockDirtyBitmaps;
};
--
2.29.2
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