On Mon, 2015-09-21 at 13:28 +0100, Julien Grall wrote: > Hi Ian, > > On 21/09/15 12:54, Ian Campbell wrote: > > On Fri, 2015-09-18 at 09:53 +0100, Ian Campbell wrote: > > > On Thu, 2015-09-17 at 19:00 +0100, Julien Grall wrote: > > > > On GICv2, the GIC virtual CPU interface is at minimum 8KB. Due some > > > > to > > > > some necessary quirk for GIC using 64KB stride, we are mapping the > > > > region in 2 time. > > > > The first mapping is 4KB and the second one is 8KB, i.e 12KB in > > > > total. > > > > Although the minimum supported size (and widely used) is 8KB. This > > > > means > > > > that we are mapping 4KB more to any guest using GICv2. > > > > > > > > While this looks scary at first glance, the GIC virtual CPU > > > > interface > > > > is > > > > most frequently at the end the GIC I/O region. So we will most > > > > likely > > > > map an an unused I/O region or a mirrored version of GICV for > > > > platform > > > > using 64KB stride. > > > > > > > > Nonetheless, fix the second mapping to only map 4KB. > > > > > > > > Signed-off-by: Julien Grall <julien.gr...@citrix.com> > > > > > > Acked-by: Ian Campbell <ian.campb...@citrix.com> > > > > > > > --- > > > > > > > > This is a candidate for Xen 4.6 and backport to Xen 4.5. > > > > > > I concur and with Wei not being around I shall plan to apply later > > > today > > > unless there are objections. > > > > I got distracted. Now applied to staging and staging-4.6 now and noted > > for > > later application to 4.5 > > It won't apply cleanly for Xen 4.5, this code was living in the gic > driver. I will send a backport patch for it.
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