[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH V6 01/10] xen/arm: gic-v3: Increase the size of GICR in address space for guest
On Fri, 2015-06-05 at 17:04 +0100, Julien Grall wrote: > On 05/06/15 16:49, Ian Campbell wrote: > > On Mon, 2015-06-01 at 20:56 +0800, Chen Baozi wrote: > >> From: Chen Baozi <baozich@xxxxxxxxx> > >> > >> Currently it only supports up to 8 vCPUs. Increase the region to hold > >> up to 128 vCPUs, which is the maximum number that GIC-500 supports. > >> > >> Signed-off-by: Chen Baozi <baozich@xxxxxxxxx> > >> Reviewed-by: Julien Grall <julien.grall@xxxxxxxxxx> > > > > Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx> > > > > I did briefly wonder if we should shoot for the stars here and reserve > > space for some enormous set of processors, but I suppose there's no > > need. > > I though about the same things. AFF0 + AFF1 gives 4096 CPUs. > > Although as we will support only 128 vCPUs (see the last patch), > reserving more space is not necessary. This space saved can be used for > a bigger PCI MMIO region later. I don't think rdistr regions need to be contiguous, so we could consider (not now, when it happens) putting CPUs 128+ into the gap above 4G, on the basis that a guest with that many CPUs is almost certainly going to have tonnes of RAM and therefore be 64 bit... Ian. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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