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Re: [PATCH v4 6/6] xen/arm: mpu: Implement a dummy enable_secondary_cpu_mm
- To: Ayan Kumar Halder <ayankuma@xxxxxxx>, Ayan Kumar Halder <ayan.kumar.halder@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 28 Oct 2024 16:01:14 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 28 Oct 2024 15:01:25 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 28.10.2024 15:39, Ayan Kumar Halder wrote:
> On 28/10/2024 12:55, Jan Beulich wrote:
>> On 28.10.2024 13:45, Ayan Kumar Halder wrote:
>>> --- a/xen/arch/Kconfig
>>> +++ b/xen/arch/Kconfig
>>> @@ -6,11 +6,13 @@ config PHYS_ADDR_T_32
>>>
>>> config NR_CPUS
>>> int "Maximum number of CPUs"
>>> + range 1 1 if ARM && MPU
>>> range 1 16383
>>> default "256" if X86
>>> default "8" if ARM && RCAR3
>>> default "4" if ARM && QEMU
>>> default "4" if ARM && MPSOC
>>> + default "1" if ARM && MPU
>>> default "128" if ARM
>>> help
>>> Controls the build-time size of various arrays and bitmaps
>> I'm afraid I can't easily tell whether MPU can be used together with any of
>> RCAR3, QEMU, or MPSOC. If it can, the new default line would need to move
>> up, as it's the first one that has a match on its condition which is being
>> used.
>
> MPU cannot be used with any of the existing platforms.
That is - qemu can't emulate such an environment, i.e. even QEMU and MPU
don't go together?
Jan
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