Re: [Xen-devel] [PATCH v2] xen: arm: improve VMID allocation.

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Tue, 2013-09-17 at 17:46 +0100, Julien Grall wrote:
> On 09/17/2013 04:56 PM, Ian Campbell wrote:
> > The VMID field is 8 bits. Rather than allowing only up to 256 VMs per host
> > reboot before things start "acting strange" instead maintain a simple bitmap
> > of used VMIDs and allocate them statically to guests upon creation.
> > 
> > This limits us to 256 concurrent VMs which is a reasonable improvement.
> > Eventually we will want a proper scheme to allocate VMIDs on context switch.
> > 
> > The existing code reserves VMID==0, IIRC I thought this was "hypervisor
> > context". Re-reading the ARM ARM I'm not spotting the bit which made me 
> > think
> > this. However I haven't changed this behaviour here.
> > 
> > Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
> Acked-by: Julien Grall <julien.grall@xxxxxxxxxx>

Thanks, applied. I dropped the final paragraph of the changelog (The
existing code reserves...) since I think we decided it was true...



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