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Re: [Qemu-devel] [PATCH] dump: Acquire BQL around vm_start() in dump thr
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH] dump: Acquire BQL around vm_start() in dump thread |
Date: |
Thu, 4 May 2017 14:59:47 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 |
On 03/05/2017 09:28, Fam Zheng wrote:
> This fixes an assertion failure in the following backtrace:
>
> __GI___assert_fail
> memory_region_transaction_commit
> memory_region_add_eventfd
> virtio_pci_ioeventfd_assign
> virtio_bus_set_host_notifier
> virtio_blk_data_plane_start
> virtio_bus_start_ioeventfd
> virtio_vmstate_change
> vm_state_notify
> vm_prepare_start
> vm_start
> dump_cleanup
> dump_process
> dump_thread
> start_thread
> clone
>
> vm_start need BQL, acquire it if doing cleaning up from main thread.
>
> Signed-off-by: Fam Zheng <address@hidden>
> ---
> dump.c | 7 +++++++
> include/sysemu/dump.h | 1 +
> 2 files changed, 8 insertions(+)
>
> diff --git a/dump.c b/dump.c
> index f7b80d8..d9090a2 100644
> --- a/dump.c
> +++ b/dump.c
> @@ -77,7 +77,13 @@ static int dump_cleanup(DumpState *s)
> memory_mapping_list_free(&s->list);
> close(s->fd);
> if (s->resume) {
> + if (s->detached) {
> + qemu_mutex_lock_iothread();
> + }
> vm_start();
> + if (s->detached) {
> + qemu_mutex_unlock_iothread();
> + }
> }
>
> return 0;
> @@ -1804,6 +1810,7 @@ void qmp_dump_guest_memory(bool paging, const char
> *file,
>
> if (detach_p) {
> /* detached dump */
> + s->detached = true;
> qemu_thread_create(&s->dump_thread, "dump_thread", dump_thread,
> s, QEMU_THREAD_DETACHED);
> } else {
> diff --git a/include/sysemu/dump.h b/include/sysemu/dump.h
> index ef931be..2672a15 100644
> --- a/include/sysemu/dump.h
> +++ b/include/sysemu/dump.h
> @@ -157,6 +157,7 @@ typedef struct DumpState {
> uint32_t sh_info;
> bool have_section;
> bool resume;
> + bool detached;
> ssize_t note_size;
> hwaddr memory_offset;
> int fd;
>
Queued, thanks.
Paolo