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