Re: [PATCH 04/12] swiotlb-xen: ensure to issue well-formed XENMEM_exchange requests

[Stefano Stabellini]

On Mon, 13 Sep 2021, Jan Beulich wrote:
> On 11.09.2021 01:14, Stefano Stabellini wrote:
> > On Tue, 7 Sep 2021, Jan Beulich wrote:
> >> While the hypervisor hasn't been enforcing this, we would still better
> >> avoid issuing requests with GFNs not aligned to the requested order.
> >>
> >> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> >> ---
> >> I wonder how useful it is to include the alignment in the panic()
> >> message.
> > 
> > Not very useful given that it is static. I don't mind either way but you
> > can go ahead and remove it if you prefer (and it would make the line
> > shorter.)
> > 
> > 
> >> I further wonder how useful it is to wrap "bytes" in
> >> PAGE_ALIGN(), when it is a multiple of a segment's size anyway (or at
> >> least was supposed to be, prior to "swiotlb-xen: maintain slab count
> >> properly").
> > 
> > This one I would keep, to make sure to print out the same amount passed
> > to memblock_alloc.
> 
> Oh - if I was to drop it from the printk(), I would have been meaning to
> also drop it there. If it's useless, then it's useless everywhere.

That's fine too