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. --- 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 | 6 ++++-- 2 files changed, 16 insertions(+), 2 deletions(-) -- 2.17.1
