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[XEN,0/2] Enable Bus Lock Detect as rate limiter

Message ID cover.1710524011.git.matthew.barnes@cloud.com (mailing list archive)
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Series Enable Bus Lock Detect as rate limiter | expand

Message

Matthew Barnes March 15, 2024, 5:52 p.m. UTC 
Bus Lock Detect can be used to reduce the effects of DoS in case it
happens.

This patch series enables BLD from MSR_DEBUGCTL if available, and
refines a mechanism to restore MSR_DEBUGCTL upon VMExit to support BLD
as well as LBR.

Said mechanism is also refactored to have a name that reflects generally
restoring the MSR, instead of only one field.

Matthew Barnes (2):
  x86: Enable BLD and handle #DB traps
  x86: Refactor LBR feature into general MSR_DEBUGCTL feature

 xen/arch/x86/cpu/common.c              |  5 +++++
 xen/arch/x86/hvm/vmx/entry.S           |  6 +++---
 xen/arch/x86/include/asm/cpufeature.h  |  2 +-
 xen/arch/x86/include/asm/cpufeatures.h |  2 +-
 xen/arch/x86/include/asm/debugreg.h    |  1 +
 xen/arch/x86/include/asm/msr-index.h   |  1 +
 xen/arch/x86/include/asm/msr.h         |  2 ++
 xen/arch/x86/msr.c                     |  2 ++
 xen/arch/x86/traps.c                   | 16 +++++++++++-----
 9 files changed, 27 insertions(+), 10 deletions(-)