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Re: [PATCH 2/2] virtio-balloon: Reject qmp_balloon during hot-unplug
From: |
David Hildenbrand |
Subject: |
Re: [PATCH 2/2] virtio-balloon: Reject qmp_balloon during hot-unplug |
Date: |
Thu, 16 Jan 2020 13:36:03 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.3.1 |
On 15.01.20 23:40, Julia Suvorova wrote:
> Hot-unplug takes some time due to communication with the guest.
> Do not change the device while freeing up resources.
>
> Signed-off-by: Julia Suvorova <address@hidden>
> ---
> balloon.c | 2 +-
> hw/virtio/virtio-balloon.c | 9 ++++++++-
> include/sysemu/balloon.h | 2 +-
> 3 files changed, 10 insertions(+), 3 deletions(-)
>
> diff --git a/balloon.c b/balloon.c
> index f104b42961..998ec53a0f 100644
> --- a/balloon.c
> +++ b/balloon.c
> @@ -119,5 +119,5 @@ void qmp_balloon(int64_t target, Error **errp)
> }
>
> trace_balloon_event(balloon_opaque, target);
> - balloon_event_fn(balloon_opaque, target);
> + balloon_event_fn(balloon_opaque, target, errp);
> }
> diff --git a/hw/virtio/virtio-balloon.c b/hw/virtio/virtio-balloon.c
> index 57f3b9f22d..0fa4e4454b 100644
> --- a/hw/virtio/virtio-balloon.c
> +++ b/hw/virtio/virtio-balloon.c
> @@ -717,12 +717,19 @@ static void virtio_balloon_stat(void *opaque,
> BalloonInfo *info)
> VIRTIO_BALLOON_PFN_SHIFT);
> }
>
> -static void virtio_balloon_to_target(void *opaque, ram_addr_t target)
> +static void virtio_balloon_to_target(void *opaque, ram_addr_t target,
> + Error **errp)
> {
> + DeviceState *bus_dev = qdev_get_bus_device(DEVICE(opaque));
> VirtIOBalloon *dev = VIRTIO_BALLOON(opaque);
> VirtIODevice *vdev = VIRTIO_DEVICE(dev);
> ram_addr_t vm_ram_size = get_current_ram_size();
>
> + if (bus_dev && bus_dev->pending_deleted_event) {
> + error_setg(errp, "Hot-unplug of %s is in progress", vdev->name);
> + return;
> + }
> +
How exactly does this help? The guest is free to inflate/deflate
whenever it wants.
--
Thanks,
David / dhildenb
- [PATCH 0/2] virtio-balloon: Reject qmp_balloon during hot-unplug, Julia Suvorova, 2020/01/15
- [PATCH 1/2] qdev: Introduce qdev_get_bus_device, Julia Suvorova, 2020/01/15
- [PATCH 2/2] virtio-balloon: Reject qmp_balloon during hot-unplug, Julia Suvorova, 2020/01/15
- Re: [PATCH 2/2] virtio-balloon: Reject qmp_balloon during hot-unplug,
David Hildenbrand <=
- Re: [PATCH 2/2] virtio-balloon: Reject qmp_balloon during hot-unplug, Julia Suvorova, 2020/01/23
- Re: [PATCH 2/2] virtio-balloon: Reject qmp_balloon during hot-unplug, David Hildenbrand, 2020/01/23
- Re: [PATCH 2/2] virtio-balloon: Reject qmp_balloon during hot-unplug, Julia Suvorova, 2020/01/23
- Re: [PATCH 2/2] virtio-balloon: Reject qmp_balloon during hot-unplug, David Hildenbrand, 2020/01/27
- Re: [PATCH 2/2] virtio-balloon: Reject qmp_balloon during hot-unplug, Michael S. Tsirkin, 2020/01/27
- Re: [PATCH 2/2] virtio-balloon: Reject qmp_balloon during hot-unplug, Julia Suvorova, 2020/01/27
- Re: [PATCH 2/2] virtio-balloon: Reject qmp_balloon during hot-unplug, Michael S. Tsirkin, 2020/01/27