49 lines
2.0 KiB
Diff
49 lines
2.0 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Fiona Ebner <f.ebner@proxmox.com>
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Date: Fri, 28 Jul 2023 10:47:48 +0200
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Subject: [PATCH] migration/block-dirty-bitmap: fix loading bitmap when there
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is an iothread
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The bdrv_create_dirty_bitmap() function (which is also called by
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bdrv_dirty_bitmap_create_successor()) uses bdrv_getlength(bs). This is
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a wrapper around a coroutine, and thus uses bdrv_poll_co(). Polling
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tries to release the AioContext which will trigger an assert() if it
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hasn't been acquired before.
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The issue does not happen for migration, because there we are in a
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coroutine already, so the wrapper will just call bdrv_co_getlength()
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directly without polling.
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Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
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---
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migration/block-dirty-bitmap.c | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/migration/block-dirty-bitmap.c b/migration/block-dirty-bitmap.c
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index 032fc5f405..e1ae3b7316 100644
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--- a/migration/block-dirty-bitmap.c
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+++ b/migration/block-dirty-bitmap.c
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@@ -805,8 +805,11 @@ static int dirty_bitmap_load_start(QEMUFile *f, DBMLoadState *s)
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"destination", bdrv_dirty_bitmap_name(s->bitmap));
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return -EINVAL;
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} else {
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+ AioContext *ctx = bdrv_get_aio_context(s->bs);
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+ aio_context_acquire(ctx);
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s->bitmap = bdrv_create_dirty_bitmap(s->bs, granularity,
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s->bitmap_name, &local_err);
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+ aio_context_release(ctx);
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if (!s->bitmap) {
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error_report_err(local_err);
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return -EINVAL;
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@@ -833,7 +836,10 @@ static int dirty_bitmap_load_start(QEMUFile *f, DBMLoadState *s)
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bdrv_disable_dirty_bitmap(s->bitmap);
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if (flags & DIRTY_BITMAP_MIG_START_FLAG_ENABLED) {
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+ AioContext *ctx = bdrv_get_aio_context(s->bs);
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+ aio_context_acquire(ctx);
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bdrv_dirty_bitmap_create_successor(s->bitmap, &local_err);
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+ aio_context_release(ctx);
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if (local_err) {
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error_report_err(local_err);
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return -EINVAL;
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