mbox series

[v4,0/2] Fix Guest random crash on Cortex-N1/A76/A75 cores

Message ID 20200825160603.32388-1-wei.chen@arm.com (mailing list archive)
Headers show
Series Fix Guest random crash on Cortex-N1/A76/A75 cores | expand

Message

Wei Chen Aug. 25, 2020, 4:06 p.m. UTC 
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.

---
 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(-)