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From 3af7c7aaf7407ec14c19e54d52a2229ce4dbb7c5 Mon Sep 17 00:00:00 2001
From: Juan Quintela <quintela@redhat.com>
Date: Wed, 1 Mar 2023 23:05:53 +0100
Subject: [PATCH 33/56] migration: Move migrate_caps_check() to options.c
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Peter Xu <peterx@redhat.com>
RH-MergeRequest: 162: migration: Pretty failures for postcopy on unsupported memory types
RH-Bugzilla: 2057267
RH-Acked-by: Leonardo Brás <leobras@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Acked-by: quintela1 <quintela@redhat.com>
RH-Commit: [32/50] 12999471063d97fffb2b04c6dcb80083b902f963 (peterx/qemu-kvm)
Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
(cherry picked from commit 77608706459bd197e25ac1ef54591b9f8a0b46f8)
Signed-off-by: Peter Xu <peterx@redhat.com>
---
migration/migration.c | 190 -----------------------------------------
migration/options.c | 192 ++++++++++++++++++++++++++++++++++++++++++
migration/options.h | 4 +
3 files changed, 196 insertions(+), 190 deletions(-)
diff --git a/migration/migration.c b/migration/migration.c
index f7facecd66..d9e30ca918 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -136,39 +136,6 @@ enum mig_rp_message_type {
MIG_RP_MSG_MAX
};
-/* Migration capabilities set */
-struct MigrateCapsSet {
- int size; /* Capability set size */
- MigrationCapability caps[]; /* Variadic array of capabilities */
-};
-typedef struct MigrateCapsSet MigrateCapsSet;
-
-/* Define and initialize MigrateCapsSet */
-#define INITIALIZE_MIGRATE_CAPS_SET(_name, ...) \
- MigrateCapsSet _name = { \
- .size = sizeof((int []) { __VA_ARGS__ }) / sizeof(int), \
- .caps = { __VA_ARGS__ } \
- }
-
-/* Background-snapshot compatibility check list */
-static const
-INITIALIZE_MIGRATE_CAPS_SET(check_caps_background_snapshot,
- MIGRATION_CAPABILITY_POSTCOPY_RAM,
- MIGRATION_CAPABILITY_DIRTY_BITMAPS,
- MIGRATION_CAPABILITY_POSTCOPY_BLOCKTIME,
- MIGRATION_CAPABILITY_LATE_BLOCK_ACTIVATE,
- MIGRATION_CAPABILITY_RETURN_PATH,
- MIGRATION_CAPABILITY_MULTIFD,
- MIGRATION_CAPABILITY_PAUSE_BEFORE_SWITCHOVER,
- MIGRATION_CAPABILITY_AUTO_CONVERGE,
- MIGRATION_CAPABILITY_RELEASE_RAM,
- MIGRATION_CAPABILITY_RDMA_PIN_ALL,
- MIGRATION_CAPABILITY_COMPRESS,
- MIGRATION_CAPABILITY_XBZRLE,
- MIGRATION_CAPABILITY_X_COLO,
- MIGRATION_CAPABILITY_VALIDATE_UUID,
- MIGRATION_CAPABILITY_ZERO_COPY_SEND);
-
/* When we add fault tolerance, we could have several
migrations at once. For now we don't need to add
dynamic creation of migration */
@@ -1235,163 +1202,6 @@ static void fill_source_migration_info(MigrationInfo *info)
info->status = state;
}
-typedef enum WriteTrackingSupport {
- WT_SUPPORT_UNKNOWN = 0,
- WT_SUPPORT_ABSENT,
- WT_SUPPORT_AVAILABLE,
- WT_SUPPORT_COMPATIBLE
-} WriteTrackingSupport;
-
-static
-WriteTrackingSupport migrate_query_write_tracking(void)
-{
- /* Check if kernel supports required UFFD features */
- if (!ram_write_tracking_available()) {
- return WT_SUPPORT_ABSENT;
- }
- /*
- * Check if current memory configuration is
- * compatible with required UFFD features.
- */
- if (!ram_write_tracking_compatible()) {
- return WT_SUPPORT_AVAILABLE;
- }
-
- return WT_SUPPORT_COMPATIBLE;
-}
-
-/**
- * @migration_caps_check - check capability compatibility
- *
- * @old_caps: old capability list
- * @new_caps: new capability list
- * @errp: set *errp if the check failed, with reason
- *
- * Returns true if check passed, otherwise false.
- */
-static bool migrate_caps_check(bool *old_caps, bool *new_caps, Error **errp)
-{
- MigrationIncomingState *mis = migration_incoming_get_current();
-
-#ifndef CONFIG_LIVE_BLOCK_MIGRATION
- if (new_caps[MIGRATION_CAPABILITY_BLOCK]) {
- error_setg(errp, "QEMU compiled without old-style (blk/-b, inc/-i) "
- "block migration");
- error_append_hint(errp, "Use drive_mirror+NBD instead.\n");
- return false;
- }
-#endif
-
-#ifndef CONFIG_REPLICATION
- if (new_caps[MIGRATION_CAPABILITY_X_COLO]) {
- error_setg(errp, "QEMU compiled without replication module"
- " can't enable COLO");
- error_append_hint(errp, "Please enable replication before COLO.\n");
- return false;
- }
-#endif
-
- if (new_caps[MIGRATION_CAPABILITY_POSTCOPY_RAM]) {
- /* This check is reasonably expensive, so only when it's being
- * set the first time, also it's only the destination that needs
- * special support.
- */
- if (!old_caps[MIGRATION_CAPABILITY_POSTCOPY_RAM] &&
- runstate_check(RUN_STATE_INMIGRATE) &&
- !postcopy_ram_supported_by_host(mis)) {
- /* postcopy_ram_supported_by_host will have emitted a more
- * detailed message
- */
- error_setg(errp, "Postcopy is not supported");
- return false;
- }
-
- if (new_caps[MIGRATION_CAPABILITY_X_IGNORE_SHARED]) {
- error_setg(errp, "Postcopy is not compatible with ignore-shared");
- return false;
- }
- }
-
- if (new_caps[MIGRATION_CAPABILITY_BACKGROUND_SNAPSHOT]) {
- WriteTrackingSupport wt_support;
- int idx;
- /*
- * Check if 'background-snapshot' capability is supported by
- * host kernel and compatible with guest memory configuration.
- */
- wt_support = migrate_query_write_tracking();
- if (wt_support < WT_SUPPORT_AVAILABLE) {
- error_setg(errp, "Background-snapshot is not supported by host kernel");
- return false;
- }
- if (wt_support < WT_SUPPORT_COMPATIBLE) {
- error_setg(errp, "Background-snapshot is not compatible "
- "with guest memory configuration");
- return false;
- }
-
- /*
- * Check if there are any migration capabilities
- * incompatible with 'background-snapshot'.
- */
- for (idx = 0; idx < check_caps_background_snapshot.size; idx++) {
- int incomp_cap = check_caps_background_snapshot.caps[idx];
- if (new_caps[incomp_cap]) {
- error_setg(errp,
- "Background-snapshot is not compatible with %s",
- MigrationCapability_str(incomp_cap));
- return false;
- }
- }
- }
-
-#ifdef CONFIG_LINUX
- if (new_caps[MIGRATION_CAPABILITY_ZERO_COPY_SEND] &&
- (!new_caps[MIGRATION_CAPABILITY_MULTIFD] ||
- new_caps[MIGRATION_CAPABILITY_COMPRESS] ||
- new_caps[MIGRATION_CAPABILITY_XBZRLE] ||
- migrate_multifd_compression() ||
- migrate_use_tls())) {
- error_setg(errp,
- "Zero copy only available for non-compressed non-TLS multifd migration");
- return false;
- }
-#else
- if (new_caps[MIGRATION_CAPABILITY_ZERO_COPY_SEND]) {
- error_setg(errp,
- "Zero copy currently only available on Linux");
- return false;
- }
-#endif
-
- if (new_caps[MIGRATION_CAPABILITY_POSTCOPY_PREEMPT]) {
- if (!new_caps[MIGRATION_CAPABILITY_POSTCOPY_RAM]) {
- error_setg(errp, "Postcopy preempt requires postcopy-ram");
- return false;
- }
-
- /*
- * Preempt mode requires urgent pages to be sent in separate
- * channel, OTOH compression logic will disorder all pages into
- * different compression channels, which is not compatible with the
- * preempt assumptions on channel assignments.
- */
- if (new_caps[MIGRATION_CAPABILITY_COMPRESS]) {
- error_setg(errp, "Postcopy preempt not compatible with compress");
- return false;
- }
- }
-
- if (new_caps[MIGRATION_CAPABILITY_MULTIFD]) {
- if (new_caps[MIGRATION_CAPABILITY_COMPRESS]) {
- error_setg(errp, "Multifd is not compatible with compress");
- return false;
- }
- }
-
- return true;
-}
-
static void fill_destination_migration_info(MigrationInfo *info)
{
MigrationIncomingState *mis = migration_incoming_get_current();
diff --git a/migration/options.c b/migration/options.c
index 9c9b8e5863..367c930f46 100644
--- a/migration/options.c
+++ b/migration/options.c
@@ -12,7 +12,10 @@
*/
#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "sysemu/runstate.h"
#include "migration.h"
+#include "ram.h"
#include "options.h"
bool migrate_auto_converge(void)
@@ -198,3 +201,192 @@ bool migrate_zero_copy_send(void)
return s->capabilities[MIGRATION_CAPABILITY_ZERO_COPY_SEND];
}
+typedef enum WriteTrackingSupport {
+ WT_SUPPORT_UNKNOWN = 0,
+ WT_SUPPORT_ABSENT,
+ WT_SUPPORT_AVAILABLE,
+ WT_SUPPORT_COMPATIBLE
+} WriteTrackingSupport;
+
+static
+WriteTrackingSupport migrate_query_write_tracking(void)
+{
+ /* Check if kernel supports required UFFD features */
+ if (!ram_write_tracking_available()) {
+ return WT_SUPPORT_ABSENT;
+ }
+ /*
+ * Check if current memory configuration is
+ * compatible with required UFFD features.
+ */
+ if (!ram_write_tracking_compatible()) {
+ return WT_SUPPORT_AVAILABLE;
+ }
+
+ return WT_SUPPORT_COMPATIBLE;
+}
+
+/* Migration capabilities set */
+struct MigrateCapsSet {
+ int size; /* Capability set size */
+ MigrationCapability caps[]; /* Variadic array of capabilities */
+};
+typedef struct MigrateCapsSet MigrateCapsSet;
+
+/* Define and initialize MigrateCapsSet */
+#define INITIALIZE_MIGRATE_CAPS_SET(_name, ...) \
+ MigrateCapsSet _name = { \
+ .size = sizeof((int []) { __VA_ARGS__ }) / sizeof(int), \
+ .caps = { __VA_ARGS__ } \
+ }
+
+/* Background-snapshot compatibility check list */
+static const
+INITIALIZE_MIGRATE_CAPS_SET(check_caps_background_snapshot,
+ MIGRATION_CAPABILITY_POSTCOPY_RAM,
+ MIGRATION_CAPABILITY_DIRTY_BITMAPS,
+ MIGRATION_CAPABILITY_POSTCOPY_BLOCKTIME,
+ MIGRATION_CAPABILITY_LATE_BLOCK_ACTIVATE,
+ MIGRATION_CAPABILITY_RETURN_PATH,
+ MIGRATION_CAPABILITY_MULTIFD,
+ MIGRATION_CAPABILITY_PAUSE_BEFORE_SWITCHOVER,
+ MIGRATION_CAPABILITY_AUTO_CONVERGE,
+ MIGRATION_CAPABILITY_RELEASE_RAM,
+ MIGRATION_CAPABILITY_RDMA_PIN_ALL,
+ MIGRATION_CAPABILITY_COMPRESS,
+ MIGRATION_CAPABILITY_XBZRLE,
+ MIGRATION_CAPABILITY_X_COLO,
+ MIGRATION_CAPABILITY_VALIDATE_UUID,
+ MIGRATION_CAPABILITY_ZERO_COPY_SEND);
+
+/**
+ * @migration_caps_check - check capability compatibility
+ *
+ * @old_caps: old capability list
+ * @new_caps: new capability list
+ * @errp: set *errp if the check failed, with reason
+ *
+ * Returns true if check passed, otherwise false.
+ */
+bool migrate_caps_check(bool *old_caps, bool *new_caps, Error **errp)
+{
+ MigrationIncomingState *mis = migration_incoming_get_current();
+
+#ifndef CONFIG_LIVE_BLOCK_MIGRATION
+ if (new_caps[MIGRATION_CAPABILITY_BLOCK]) {
+ error_setg(errp, "QEMU compiled without old-style (blk/-b, inc/-i) "
+ "block migration");
+ error_append_hint(errp, "Use drive_mirror+NBD instead.\n");
+ return false;
+ }
+#endif
+
+#ifndef CONFIG_REPLICATION
+ if (new_caps[MIGRATION_CAPABILITY_X_COLO]) {
+ error_setg(errp, "QEMU compiled without replication module"
+ " can't enable COLO");
+ error_append_hint(errp, "Please enable replication before COLO.\n");
+ return false;
+ }
+#endif
+
+ if (new_caps[MIGRATION_CAPABILITY_POSTCOPY_RAM]) {
+ /* This check is reasonably expensive, so only when it's being
+ * set the first time, also it's only the destination that needs
+ * special support.
+ */
+ if (!old_caps[MIGRATION_CAPABILITY_POSTCOPY_RAM] &&
+ runstate_check(RUN_STATE_INMIGRATE) &&
+ !postcopy_ram_supported_by_host(mis)) {
+ /* postcopy_ram_supported_by_host will have emitted a more
+ * detailed message
+ */
+ error_setg(errp, "Postcopy is not supported");
+ return false;
+ }
+
+ if (new_caps[MIGRATION_CAPABILITY_X_IGNORE_SHARED]) {
+ error_setg(errp, "Postcopy is not compatible with ignore-shared");
+ return false;
+ }
+ }
+
+ if (new_caps[MIGRATION_CAPABILITY_BACKGROUND_SNAPSHOT]) {
+ WriteTrackingSupport wt_support;
+ int idx;
+ /*
+ * Check if 'background-snapshot' capability is supported by
+ * host kernel and compatible with guest memory configuration.
+ */
+ wt_support = migrate_query_write_tracking();
+ if (wt_support < WT_SUPPORT_AVAILABLE) {
+ error_setg(errp, "Background-snapshot is not supported by host kernel");
+ return false;
+ }
+ if (wt_support < WT_SUPPORT_COMPATIBLE) {
+ error_setg(errp, "Background-snapshot is not compatible "
+ "with guest memory configuration");
+ return false;
+ }
+
+ /*
+ * Check if there are any migration capabilities
+ * incompatible with 'background-snapshot'.
+ */
+ for (idx = 0; idx < check_caps_background_snapshot.size; idx++) {
+ int incomp_cap = check_caps_background_snapshot.caps[idx];
+ if (new_caps[incomp_cap]) {
+ error_setg(errp,
+ "Background-snapshot is not compatible with %s",
+ MigrationCapability_str(incomp_cap));
+ return false;
+ }
+ }
+ }
+
+#ifdef CONFIG_LINUX
+ if (new_caps[MIGRATION_CAPABILITY_ZERO_COPY_SEND] &&
+ (!new_caps[MIGRATION_CAPABILITY_MULTIFD] ||
+ new_caps[MIGRATION_CAPABILITY_COMPRESS] ||
+ new_caps[MIGRATION_CAPABILITY_XBZRLE] ||
+ migrate_multifd_compression() ||
+ migrate_use_tls())) {
+ error_setg(errp,
+ "Zero copy only available for non-compressed non-TLS multifd migration");
+ return false;
+ }
+#else
+ if (new_caps[MIGRATION_CAPABILITY_ZERO_COPY_SEND]) {
+ error_setg(errp,
+ "Zero copy currently only available on Linux");
+ return false;
+ }
+#endif
+
+ if (new_caps[MIGRATION_CAPABILITY_POSTCOPY_PREEMPT]) {
+ if (!new_caps[MIGRATION_CAPABILITY_POSTCOPY_RAM]) {
+ error_setg(errp, "Postcopy preempt requires postcopy-ram");
+ return false;
+ }
+
+ /*
+ * Preempt mode requires urgent pages to be sent in separate
+ * channel, OTOH compression logic will disorder all pages into
+ * different compression channels, which is not compatible with the
+ * preempt assumptions on channel assignments.
+ */
+ if (new_caps[MIGRATION_CAPABILITY_COMPRESS]) {
+ error_setg(errp, "Postcopy preempt not compatible with compress");
+ return false;
+ }
+ }
+
+ if (new_caps[MIGRATION_CAPABILITY_MULTIFD]) {
+ if (new_caps[MIGRATION_CAPABILITY_COMPRESS]) {
+ error_setg(errp, "Multifd is not compatible with compress");
+ return false;
+ }
+ }
+
+ return true;
+}
diff --git a/migration/options.h b/migration/options.h
index 25c002b37a..e779f14161 100644
--- a/migration/options.h
+++ b/migration/options.h
@@ -38,4 +38,8 @@ bool migrate_xbzrle(void);
bool migrate_zero_blocks(void);
bool migrate_zero_copy_send(void);
+/* capabilities helpers */
+
+bool migrate_caps_check(bool *old_caps, bool *new_caps, Error **errp);
+
#endif
--
2.39.1
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