Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
MIME-Version: 1.0
References: <20210809101609.148-1-xieyongji@bytedance.com> <20211004112623-mutt-send-email-mst@kernel.org>
 <20211005062359-mutt-send-email-mst@kernel.org> <20211011114041.GB16138@lst.de>
 <20211013082025-mutt-send-email-mst@kernel.org>
In-Reply-To: <20211013082025-mutt-send-email-mst@kernel.org>
From:   Yongji Xie <xieyongji@bytedance.com>
Date:   Wed, 13 Oct 2021 20:34:22 +0800
Message-ID: <CACycT3skLJp1HfovKP8AvQmdxhyJNG6YFrb6kXjd48qaztHBNQ@mail.gmail.com>
Subject: Re: [PATCH v5] virtio-blk: Add validation for block size in config space
To:     "Michael S. Tsirkin" <mst@redhat.com>
Cc:     Christoph Hellwig <hch@lst.de>, Jason Wang <jasowang@redhat.com>,
        Stefan Hajnoczi <stefanha@redhat.com>,
        virtualization <virtualization@lists.linux-foundation.org>,
        linux-block@vger.kernel.org,
        linux-kernel <linux-kernel@vger.kernel.org>,
        Kevin Wolf <kwolf@redhat.com>, Jens Axboe <axboe@kernel.dk>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

On Wed, Oct 13, 2021 at 8:21 PM Michael S. Tsirkin <mst@redhat.com> wrote:
>
> On Mon, Oct 11, 2021 at 01:40:41PM +0200, Christoph Hellwig wrote:
> > On Tue, Oct 05, 2021 at 06:42:43AM -0400, Michael S. Tsirkin wrote:
> > > Stefan also pointed out this duplicates the logic from
> > >
> > >         if (blksize < 512 || blksize > PAGE_SIZE || !is_power_of_2(blksize))
> > >                 return -EINVAL;
> > >
> > >
> > > and a bunch of other places.
> > >
> > >
> > > Would it be acceptable for blk layer to validate the input
> > > instead of having each driver do it's own thing?
> > > Maybe inside blk_queue_logical_block_size?
> >
> > I'm pretty sure we want down that before.  Let's just add a helper
> > just for that check for now as part of this series.  Actually validating
> > in in blk_queue_logical_block_size seems like a good idea, but returning
> > errors from that has a long tail.
>
> Xie Yongji, I think I will revert this patch for now - can you
> please work out adding that helper and using it in virtio?
>

Fine, I will do it.

Thanks,
Yongji