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qemu-kvm/SOURCES/kvm-migration-Pass-migrate_...

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From 4782b59a8b0b5762f87505ac7a83b37ddd2e0b3f Mon Sep 17 00:00:00 2001
From: Juan Quintela <quintela@redhat.com>
Date: Wed, 1 Mar 2023 20:28:56 +0100
Subject: [PATCH 19/56] migration: Pass migrate_caps_check() the old and new
caps
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: [18/50] df78d680d03f15d7cb7401ad89e68a4fc93fa835 (peterx/qemu-kvm)
We used to pass the old capabilities array and the new
capabilities as a list.
Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
(cherry picked from commit b02c7fc9ef447787414e6fa67eff75e7b7b30180)
Signed-off-by: Peter Xu <peterx@redhat.com>
---
migration/migration.c | 80 +++++++++++++++++--------------------------
1 file changed, 31 insertions(+), 49 deletions(-)
diff --git a/migration/migration.c b/migration/migration.c
index d8e5fb6226..e8f596bcfa 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1299,30 +1299,20 @@ WriteTrackingSupport migrate_query_write_tracking(void)
}
/**
- * @migration_caps_check - check capability validity
+ * @migration_caps_check - check capability compatibility
*
- * @cap_list: old capability list, array of bool
- * @params: new capabilities to be applied soon
+ * @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 *cap_list,
- MigrationCapabilityStatusList *params,
- Error **errp)
+static bool migrate_caps_check(bool *old_caps, bool *new_caps, Error **errp)
{
- MigrationCapabilityStatusList *cap;
- bool old_postcopy_cap;
MigrationIncomingState *mis = migration_incoming_get_current();
- old_postcopy_cap = cap_list[MIGRATION_CAPABILITY_POSTCOPY_RAM];
-
- for (cap = params; cap; cap = cap->next) {
- cap_list[cap->value->capability] = cap->value->state;
- }
-
#ifndef CONFIG_LIVE_BLOCK_MIGRATION
- if (cap_list[MIGRATION_CAPABILITY_BLOCK]) {
+ 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");
@@ -1331,7 +1321,7 @@ static bool migrate_caps_check(bool *cap_list,
#endif
#ifndef CONFIG_REPLICATION
- if (cap_list[MIGRATION_CAPABILITY_X_COLO]) {
+ 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");
@@ -1339,12 +1329,13 @@ static bool migrate_caps_check(bool *cap_list,
}
#endif
- if (cap_list[MIGRATION_CAPABILITY_POSTCOPY_RAM]) {
+ 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_postcopy_cap && runstate_check(RUN_STATE_INMIGRATE) &&
+ 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
@@ -1353,13 +1344,13 @@ static bool migrate_caps_check(bool *cap_list,
return false;
}
- if (cap_list[MIGRATION_CAPABILITY_X_IGNORE_SHARED]) {
+ if (new_caps[MIGRATION_CAPABILITY_X_IGNORE_SHARED]) {
error_setg(errp, "Postcopy is not compatible with ignore-shared");
return false;
}
}
- if (cap_list[MIGRATION_CAPABILITY_BACKGROUND_SNAPSHOT]) {
+ if (new_caps[MIGRATION_CAPABILITY_BACKGROUND_SNAPSHOT]) {
WriteTrackingSupport wt_support;
int idx;
/*
@@ -1383,7 +1374,7 @@ static bool migrate_caps_check(bool *cap_list,
*/
for (idx = 0; idx < check_caps_background_snapshot.size; idx++) {
int incomp_cap = check_caps_background_snapshot.caps[idx];
- if (cap_list[incomp_cap]) {
+ if (new_caps[incomp_cap]) {
error_setg(errp,
"Background-snapshot is not compatible with %s",
MigrationCapability_str(incomp_cap));
@@ -1393,10 +1384,10 @@ static bool migrate_caps_check(bool *cap_list,
}
#ifdef CONFIG_LINUX
- if (cap_list[MIGRATION_CAPABILITY_ZERO_COPY_SEND] &&
- (!cap_list[MIGRATION_CAPABILITY_MULTIFD] ||
- cap_list[MIGRATION_CAPABILITY_COMPRESS] ||
- cap_list[MIGRATION_CAPABILITY_XBZRLE] ||
+ 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,
@@ -1404,15 +1395,15 @@ static bool migrate_caps_check(bool *cap_list,
return false;
}
#else
- if (cap_list[MIGRATION_CAPABILITY_ZERO_COPY_SEND]) {
+ if (new_caps[MIGRATION_CAPABILITY_ZERO_COPY_SEND]) {
error_setg(errp,
"Zero copy currently only available on Linux");
return false;
}
#endif
- if (cap_list[MIGRATION_CAPABILITY_POSTCOPY_PREEMPT]) {
- if (!cap_list[MIGRATION_CAPABILITY_POSTCOPY_RAM]) {
+ if (new_caps[MIGRATION_CAPABILITY_POSTCOPY_PREEMPT]) {
+ if (!new_caps[MIGRATION_CAPABILITY_POSTCOPY_RAM]) {
error_setg(errp, "Postcopy preempt requires postcopy-ram");
return false;
}
@@ -1423,14 +1414,14 @@ static bool migrate_caps_check(bool *cap_list,
* different compression channels, which is not compatible with the
* preempt assumptions on channel assignments.
*/
- if (cap_list[MIGRATION_CAPABILITY_COMPRESS]) {
+ if (new_caps[MIGRATION_CAPABILITY_COMPRESS]) {
error_setg(errp, "Postcopy preempt not compatible with compress");
return false;
}
}
- if (cap_list[MIGRATION_CAPABILITY_MULTIFD]) {
- if (cap_list[MIGRATION_CAPABILITY_COMPRESS]) {
+ if (new_caps[MIGRATION_CAPABILITY_MULTIFD]) {
+ if (new_caps[MIGRATION_CAPABILITY_COMPRESS]) {
error_setg(errp, "Multifd is not compatible with compress");
return false;
}
@@ -1486,15 +1477,19 @@ void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params,
{
MigrationState *s = migrate_get_current();
MigrationCapabilityStatusList *cap;
- bool cap_list[MIGRATION_CAPABILITY__MAX];
+ bool new_caps[MIGRATION_CAPABILITY__MAX];
if (migration_is_running(s->state)) {
error_setg(errp, QERR_MIGRATION_ACTIVE);
return;
}
- memcpy(cap_list, s->capabilities, sizeof(cap_list));
- if (!migrate_caps_check(cap_list, params, errp)) {
+ memcpy(new_caps, s->capabilities, sizeof(new_caps));
+ for (cap = params; cap; cap = cap->next) {
+ new_caps[cap->value->capability] = cap->value->state;
+ }
+
+ if (!migrate_caps_check(s->capabilities, new_caps, errp)) {
return;
}
@@ -4634,27 +4629,14 @@ static void migration_instance_init(Object *obj)
*/
static bool migration_object_check(MigrationState *ms, Error **errp)
{
- MigrationCapabilityStatusList *head = NULL;
/* Assuming all off */
- bool cap_list[MIGRATION_CAPABILITY__MAX] = { 0 }, ret;
- int i;
+ bool old_caps[MIGRATION_CAPABILITY__MAX] = { 0 };
if (!migrate_params_check(&ms->parameters, errp)) {
return false;
}
- for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) {
- if (ms->capabilities[i]) {
- QAPI_LIST_PREPEND(head, migrate_cap_add(i, true));
- }
- }
-
- ret = migrate_caps_check(cap_list, head, errp);
-
- /* It works with head == NULL */
- qapi_free_MigrationCapabilityStatusList(head);
-
- return ret;
+ return migrate_caps_check(old_caps, ms->capabilities, errp);
}
static const TypeInfo migration_type = {
--
2.39.1
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