Re: [Xen-devel] [PATCH v4 03/16] libxl/arm: Generate static ACPI DSDT table

[Shannon Zhao <zhaoshenglong@xxxxxxxxxx>]

On 2016/8/30 1:46, Julien Grall wrote:
> Hi Shannon,
> 
> On 16/08/2016 06:25, Shannon Zhao wrote:
>> From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
>>
>> It uses static DSDT table like the way x86 uses. Currently the DSDT
>> table only contains processor device objects and it generates the
>> maximal objects which so far is 128.
>>
>> Also only check iasl for aarch64 in configure since ACPI on ARM32 is not
>> supported.
>>
>> Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
>> ---
>>  tools/configure               |  2 +-
> 
> The file tools/configure should not be modified manually. Instead you
> have to modify tools/configure.ac.
> 
> You can regenerate tools/configure, you can call ./autegen.sh. However,
> I would recommend you to not include the changes of configure and ask
> the committer to regenerate. This is because we use always use the same
> version of autotools to do generation in order to avoid spurious change.
> 
Ok, will fix.

>> diff --git a/xen/include/public/arch-arm.h
>> b/xen/include/public/arch-arm.h
>> index 0afd654..008a2a0 100644
>> --- a/xen/include/public/arch-arm.h
>> +++ b/xen/include/public/arch-arm.h
>> @@ -435,6 +435,9 @@ typedef uint64_t xen_callback_t;
>>  #define GUEST_RAM_BANK_BASES   { GUEST_RAM0_BASE, GUEST_RAM1_BASE }
>>  #define GUEST_RAM_BANK_SIZES   { GUEST_RAM0_SIZE, GUEST_RAM1_SIZE }
>>
>> +/* Current supported guest VCPUs */
>> +#define GUEST_MAX_VCPUS 128
> 
> The number of vCPUS per guest supported depends whether Xen has been
> built for ARM32 or ARM64.
> 
> Also, because now we have two different place to define the number of
> vCPUS (here and include/asm-arm/config.h) it might be possible to have
> them differ by mistake.
> 
> I am not sure how to avoid the 2 definitions, so I would add a
> BUILD_BUG_ON in Xen to make sure that MAX_VIRT_CPUS is always <= to
> GUEST_MAX_VCPUS.
> 
It has the below check. So could we just define GUEST_MAX_VCPUS as
(GUEST_GICV3_GICR0_SIZE / GUEST_GICV3_RDIST_STRIDE)?

BUILD_BUG_ON((GUEST_GICV3_GICR0_SIZE / GUEST_GICV3_RDIST_STRIDE) <
MAX_VIRT_CPUS);

Thanks,
-- 
Shannon


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