Re: [Xen-devel] Design doc of adding ACPI support for arm64 on Xen - version 2

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 12.08.15 at 17:51, <christoffer.dall@xxxxxxxxxx> wrote:
> On Wed, Aug 12, 2015 at 5:45 PM, Jan Beulich <JBeulich@xxxxxxxx> wrote:
>>>>> On 07.08.15 at 04:11, <zhaoshenglong@xxxxxxxxxx> wrote:
>>> All these tables will be copied to Dom0 memory except that the reused
>>> tables(DSDT, SPCR, etc) will be mapped to Dom0.
>>
>> Which again seems odd - such tables should be considered MMIO
>> (despite living in RAM), and hence not be part of Dom0's memory
>> assignment.
>>
> not sure if this applies to the context of your comment, but we had
> issues before when trying to deal with this data as device memory
> (MMIO), because ARM doesn't allow unaligned accesses etc. on device
> memory, and so Dom0 would crash at memory abort exceptions during
> boot, so this really does have to be mapped as RAM to Dom0.  If you
> meant some internal Xen bookkeeping thing, then just ignore me.

Hmm, how would native Linux avoid such unaligned accesses then?

Jan


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel