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Re: [Qemu-devel] [PATCH] virtio: Mark virtio-device as non-user-creatabl
From: |
Halil Pasic |
Subject: |
Re: [Qemu-devel] [PATCH] virtio: Mark virtio-device as non-user-creatable |
Date: |
Wed, 2 Aug 2017 14:33:00 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.0 |
On 08/02/2017 01:01 AM, Eduardo Habkost wrote:
> TYPE_VIRTIO_DEVICE devices are already not usable with -device
> and device_add, but they are reported as user-creatable on
> "-device help" and through monitor interfaces.
I've tried -device virtio-rng on s390x and from what I see, it
seems we 'auto-magically' create the 'controlling' virtio-rng-ccw
device. So I have to ask what do you mean by 'already not usable'?
>
> Mark them as not user-creatable to avoid confusing users, and to
> allow automated testing (e.g. scripts/device-crash-test) to skip
> them.
>
> Before this patch, device-crash-test will try to test
> virtio-device devices with all machine-types:
>
> $ time ./scripts/device-crash-test -D virtio-device -v
> ./x86_64-softmmu/qemu-system-x86_64
> [...]
> INFO: Total: 1088 test cases
> INFO: Skipped 408 test cases
>
> real 0m49.775s
>
> After this patch, the script won't try to test virtio-device
> devices:
>
> $ time ./scripts/device-crash-test -D virtio-device -v
> ./x86_64-softmmu/qemu-system-x86_64
> INFO: Total: 0 test cases
>
> real 0m0.092s
>
> Signed-off-by: Eduardo Habkost <address@hidden>
> ---
> hw/virtio/virtio.c | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
> diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
> index 464947f..c4bdb94 100644
> --- a/hw/virtio/virtio.c
> +++ b/hw/virtio/virtio.c
> @@ -2653,6 +2653,17 @@ static void virtio_device_class_init(ObjectClass
> *klass, void *data)
> dc->unrealize = virtio_device_unrealize;
> dc->bus_type = TYPE_VIRTIO_BUS;
> dc->props = virtio_properties;
> + /*
> + * Reason:
> + * - TYPE_VIRTIO_DEVICE devices are not visible to guests
> + * unless they are created and controlled by transport-specific
> + * devices (virtio-pci, virtio-mmio, and virtio-ccw).
> + * - A TYPE_VIRTIO_BUS bus is never available for plugging
> + * using -device/device_add, as virtio-bus buses are
> + * created on the fly and immediately populated by the
> + * transport-specific devices' realize methods.
> + */
> + dc->user_creatable = false;
> vdc->start_ioeventfd = virtio_device_start_ioeventfd_impl;
> vdc->stop_ioeventfd = virtio_device_stop_ioeventfd_impl;
>