Re: [QEMU HCI-8.0 PATCH v4 2/5] vhost-blk: change backend setup

[Andrey Drobyshev <andrey.drobyshev@virtuozzo.com>]

On Tue, 08 Sep 2026 15:52:05 +0300, Andrey Zhadchenko <andrey.zhadchenko@virtuozzo.com> wrote:
> Previously we used very ugly and incapsulation-breaking assignment
> fd = blk_bs(s->conf.conf.blk)->file->bs->opaque;
> It is wrong in a many ways, so let's rework this.
> 
> Patch changes default `drive` to new `devpath` option so device fd
> is managed by vhost-blk itself. Unfortunately this way we need a
> bit more preparational work: finding out disk length, etc. Don't
> be too broad and just do the minimal work.
> Also drop generic block device properties along with the block
> node: the kernel module does all IO in terms of 512 sectors, so
> simply report 512 byte logical/physical block size to the guest.
> Existing vhost-blk setups will break, but it is expected.
> 
> [...]

Reviewed-by: Andrey Drobyshev <andrey.drobyshev@virtuozzo.com>

-- 
Andrey Drobyshev <andrey.drobyshev@virtuozzo.com>