linux-kernel - Re: [PATCH v7 31/46] vhost: virtio 1.0 endian-ness support

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Message-ID: <20141201124957.GA18106@redhat.com>
Date:	Mon, 1 Dec 2014 14:49:57 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Cornelia Huck <cornelia.huck@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, David Miller <davem@...emloft.net>,
	rusty@....ibm.com, nab@...ux-iscsi.org, pbonzini@...hat.com,
	thuth@...ux.vnet.ibm.com, dahi@...ux.vnet.ibm.com,
	kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH v7 31/46] vhost: virtio 1.0 endian-ness support

On Mon, Dec 01, 2014 at 01:42:47PM +0100, Cornelia Huck wrote:
> On Mon, 1 Dec 2014 14:37:01 +0200
> "Michael S. Tsirkin" <mst@...hat.com> wrote:
> 
> > On Mon, Dec 01, 2014 at 01:33:53PM +0100, Cornelia Huck wrote:
> > > On Sun, 30 Nov 2014 17:11:49 +0200
> > > "Michael S. Tsirkin" <mst@...hat.com> wrote:
> > > 
> > > > Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> > > > ---
> > > >  drivers/vhost/vhost.c | 93 +++++++++++++++++++++++++++++++--------------------
> > > >  1 file changed, 56 insertions(+), 37 deletions(-)
> > > > 
> > > 
> > > > @@ -1113,18 +1120,19 @@ static int get_indirect(struct vhost_virtqueue *vq,
> > > >  {
> > > >  	struct vring_desc desc;
> > > >  	unsigned int i = 0, count, found = 0;
> > > > +	u32 len = vhost32_to_cpu(vq, indirect->len);
> > > >  	int ret;
> > > > 
> > > >  	/* Sanity check */
> > > > -	if (unlikely(indirect->len % sizeof desc)) {
> > > > +	if (unlikely(len % sizeof desc)) {
> > > >  		vq_err(vq, "Invalid length in indirect descriptor: "
> > > >  		       "len 0x%llx not multiple of 0x%zx\n",
> > > > -		       (unsigned long long)indirect->len,
> > > > +		       (unsigned long long)vhost32_to_cpu(vq, indirect->len),
> > > 
> > > Can't you use len here?
> > 
> > Not if I want error message to be readable.
> 
> Huh? Both have the same value.

Ah, good point.
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