Re: [Xen-devel] [PATCH] ns16550: limit mapped MMIO size

2015-11-17 Thread Ian Campbell
On Tue, 2015-11-17 at 03:19 -0700, Jan Beulich wrote: > > > > On 16.11.15 at 17:52, wrote: > > On Thu, 2015-11-12 at 08:52 -0700, Jan Beulich wrote: > > > There's no point in mapping more than the memory we actually may need > > > to touch, and in fact the too large region could actually extend in

Re: [Xen-devel] [PATCH] ns16550: limit mapped MMIO size

2015-11-17 Thread Jan Beulich
>>> On 16.11.15 at 17:52, wrote: > On Thu, 2015-11-12 at 08:52 -0700, Jan Beulich wrote: >> There's no point in mapping more than the memory we actually may need >> to touch, and in fact the too large region could actually extend into >> another device's one (which currently is benign on x86 since

Re: [Xen-devel] [PATCH] ns16550: limit mapped MMIO size

2015-11-16 Thread Ian Campbell
On Thu, 2015-11-12 at 08:52 -0700, Jan Beulich wrote: > There's no point in mapping more than the memory we actually may need > to touch, and in fact the too large region could actually extend into > another device's one (which currently is benign on x86 since only a > single page gets mapped anywa

Re: [Xen-devel] [PATCH] ns16550: limit mapped MMIO size

2015-11-12 Thread Andrew Cooper
On 12/11/15 15:52, Jan Beulich wrote: > There's no point in mapping more than the memory we actually may need > to touch, and in fact the too large region could actually extend into > another device's one (which currently is benign on x86 since only a > single page gets mapped anyway, but which is

[Xen-devel] [PATCH] ns16550: limit mapped MMIO size

2015-11-12 Thread Jan Beulich
There's no point in mapping more than the memory we actually may need to touch, and in fact the too large region could actually extend into another device's one (which currently is benign on x86 since only a single page gets mapped anyway, but which is a latent bug on ARM whenever PCI support gets