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[Xen-devel,v2,0/7] xen/arm32: Branch predictor hardening (XSA-254 variant 2)

Message ID 20180131165334.23175-1-julien.grall@arm.com
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Series xen/arm32: Branch predictor hardening (XSA-254 variant 2) | expand

Message

Julien Grall Jan. 31, 2018, 4:53 p.m. UTC 
Hi all,

This series provides a skeleton for mitigating branch predictor hardening for
arm32 on exception entry.

It also implements mitigation for Cortex-A12, A15 and A17. SoC vendors with
affected CPUs are strongly encouraged to update.

For more information about the impact of this issue and the software mitigations
for Arm processors, please see http://www.arm.com/security-update.

Cheers,

Julien Grall (7):
  xen/arm32: entry: Consolidate DEFINE_TRAP_ENTRY_* macros
  xen/arm32: Add missing MIDR values for Cortex-A17 and A12
  xen/arm32: entry: Add missing trap_reset entry
  xen/arm32: Add skeleton to harden branch predictor aliasing attacks
  xen/arm32: Invalidate BTB on guest exit for Cortex A17 and 12
  xen/arm32: Invalidate icache on guest exist for Cortex-A15
  xen/arm32: entry: Document the purpose of r11 in the traps handler

 xen/arch/arm/Kconfig            |   3 +
 xen/arch/arm/arm32/entry.S      | 164 ++++++++++++++++++++++++++++++++++------
 xen/arch/arm/arm32/traps.c      |   5 ++
 xen/arch/arm/cpuerrata.c        |  62 +++++++++++++++
 xen/include/asm-arm/processor.h |   4 +
 5 files changed, 213 insertions(+), 25 deletions(-)