Re: [PATCH v2 3/6] blockdev: with -drive if=virtio, use generic virtio-blk

[Cornelia Huck <cohuck@redhat.com>]

On Fri, 19 Mar 2021 14:25:34 +0100
Laurent Vivier <laurent@vivier.eu> wrote:

> Rather than checking if the machine is an s390x to use virtio-blk-ccw
> instead of virtio-blk-pci, use the alias virtio-blk that is set to
> the expected target.

One side effect: if we add a new architecture and don't define the
aliases for it, this function probably won't do the right thing; prior
to the patch, it would simply default to virtio-blk-pci. Probably not a
big deal, but we need to be careful to keep the alias defines up to
date, which previously wasn't such a big deal.

> 
> This also enables the use of virtio-blk-device for targets without
> PCI or CCW.
> 
> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
> ---
>  blockdev.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/blockdev.c b/blockdev.c
> index 5cc7c7effe9f..64da5350e3ad 100644
> --- a/blockdev.c
> +++ b/blockdev.c
> @@ -969,11 +969,7 @@ DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type,
>          QemuOpts *devopts;
>          devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
>                                     &error_abort);
> -        if (arch_type == QEMU_ARCH_S390X) {
> -            qemu_opt_set(devopts, "driver", "virtio-blk-ccw", &error_abort);
> -        } else {
> -            qemu_opt_set(devopts, "driver", "virtio-blk-pci", &error_abort);
> -        }
> +        qemu_opt_set(devopts, "driver", "virtio-blk", &error_abort);
>          qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
>                       &error_abort);
>      }