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plugins: add migration blocker

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If the plugin in controlling time there is some state that might be
missing from the plugin tracking it. Migration is unlikely to work in
this case so lets put a migration blocker in to let the user know if
they try.

Suggested-by: Dr. David Alan Gilbert <dave@treblig.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240620152220.2192768-10-alex.bennee@linaro.org>
This commit is contained in:
Alex Bennée 2024-06-20 16:22:17 +01:00
parent 847a65dd76
commit 508036532c
1 changed files with 10 additions and 0 deletions
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10
plugins/api.c
View file

@ -47,6 +47,8 @@
#include "disas/disas.h"
#include "plugin.h"
#ifndef CONFIG_USER_ONLY
#include "qapi/error.h"
#include "migration/blocker.h"
#include "exec/ram_addr.h"
#include "qemu/plugin-memory.h"
#include "hw/boards.h"
@ -589,11 +591,19 @@ uint64_t qemu_plugin_u64_sum(qemu_plugin_u64 entry)
* Time control
*/
static bool has_control;
#ifdef CONFIG_SOFTMMU
static Error *migration_blocker;
#endif
const void *qemu_plugin_request_time_control(void)
{
if (!has_control) {
has_control = true;
#ifdef CONFIG_SOFTMMU
error_setg(&migration_blocker,
"TCG plugin time control does not support migration");
migrate_add_blocker(&migration_blocker, NULL);
#endif
return &has_control;
}
return NULL;