Re: [PATCH v5 0/2] Fix Guest random crash on Cortex-N1/A76/A75 cores

[Julien Grall <julien@xxxxxxx>]

Hi Wei,

On 28/08/2020 03:34, Wei Chen wrote:
> On latest Arm Cortex-N1/A76/A75 cores, Xen guests will encouter random
> crash when they have wordloads. It's because Xen will ignore FP/SIMD
> registers in vCPU context switch (see patch#1 for more details).
>
> This patch set fix guest random crash on these new cores, and throw
> messages when Xen detects known FP/SIMD features.
>
> ---
>   v4 --> v5:
>    1. Fix typos.
For future reference, the committers are generally happy to fix the 
typoes on commit if you ask them nicely :).
I will commit the two patches later today.

Cheers,


>   v3 --> v4:
>    1. Use open-code instead of new cpu_has_unknown_{fp,simd} macros.
>
>   v2 --> v3:
>    1. Improve the warning messages to give clear meanings
>    2. Fix typos
>
>   v1 --> v2:
>    1. Use "< 8" instead of "<= 1" to detect FP/SIMD features.
>    2. Give messages for unknown FP/SIMD features.
>    3. Fix typos.
>   
>   v1:
>    https://lists.xenproject.org/archives/html/xen-devel/2020-08/msg00857.html
>
> Wei Chen (2):
>    xen/arm: Missing N1/A76/A75 FP registers in vCPU context switch
>    xen/arm: Throw messages for unknown FP/SIMD implement ID
>
>   xen/arch/arm/setup.c             | 12 ++++++++++++
>   xen/include/asm-arm/cpufeature.h |  4 ++--
>   2 files changed, 14 insertions(+), 2 deletions(-)
--
Julien Grall