Re: [Xen-devel] [PATCH] xen: workaround for 64-bit size/alignment bitops

[David Vrabel <david.vrabel@xxxxxxxxxx>]

On 28/04/14 09:47, Pranavkumar Sawargaonkar wrote:
> On 27 April 2014 14:39, Vladimir Murzin <murzin.v@xxxxxxxxx> wrote:
>> Xen assumes that bit operations are able to operate on 32-bit size and
>> alignment. For arm64 bitops are based on atomic exclusive load/store
>> instructions to guarantee that changes are made atomically. However, these
>> instructions require that address to be aligned to the data size. Because, by
>> default, bitops operates on 64-bit size it implies that address should be
>> aligned appropriately. All these lead to breakage of Xen assumption for 
>> bitops
>> properties.
>>
>> As a workaround address is aligned forcefully along with adjustment for bit
>> position.
>>
[...]
> 
> I have tried this patch on XGENE and works fine, I have managed to get
> dom0 and domU working with it.
> 
> Tested-by: Pranavkumar Sawargaonkar <pranavkumar@xxxxxxxxxx>

Thanks.  Are there arm64 platforms that support Xen currently available
in 3.15?  Or can this wait until 3.16?

David

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