[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] [PATCH 8/9] xen/arch/x86: use is_hardware_domain instead of domid == 0

On 12/04/13 17:48, Andrew Cooper wrote:
> On 12/04/13 16:49, Ian Campbell wrote:
>> On Fri, 2013-04-12 at 16:41 +0100, Keir Fraser wrote:
>>> We could get rid of this not-always-faulting-cpuid hack in the
>>> hypervisor altogether, if we could provide a paravirtualised interface
>>> that guarantees access to the real CPUID space, for the toolstack to
>>> use. 
>> Doesn't XCP have a patch which allows access to the non-levelled cpuid
>> values for the toolstacks benefit? Andy C CCd...
> XCP/XenServer has a specific patch which records the real CPUID values
> before applying the MSRs for feature masking, which can then subsequently
queried by the toolstack.

(Apologies - I sent mid-sentence)


> This allows the toolstack to recalculate the host level parity bits
> correctly whenever a host is added or removed from the pool, without
> suffering the problems of getting into a diminishing subset of features
> as slightly heterogeneous hardware is moved in and out of the pool.
> The patch is currently in the state of "Needing to be cleaned up for
> upstream" and is in my todo list (albeit quite far down given some
> recent Xen crashes found during stress testing)
> I can up its priority if there is a need for it.
> ~Andrew
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxx
> http://lists.xen.org/xen-devel

Xen-devel mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.