Messages in this thread |  | | From | Xiaoyao Li <> | Subject | [PATCH v7 0/2] Fix and optimization of split_lock_detection | Date | Wed, 25 Mar 2020 11:09:22 +0800 |
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This series is split from "[PATCH v6 0/8] x86/split_lock: Fix and virtualization of split lock detection"[1]. It contains one fix for the initialization flow of split_lock_detection and one optimiazation for runtime TEST_CTRL MSR access.
Other patches of [1] needs more time to improve.
Thanks.
[1]: https://lore.kernel.org/kvm/20200324151859.31068-1-xiaoyao.li@intel.com/
Changes in v7: - only pick patch 1 and patch 2, and hold all the left. - Update SLD bit on each processor based on sld_state.
Changes in v6: - Drop the sld_not_exist flag and use X86_FEATURE_SPLIT_LOCK_DETECT to check whether need to init split lock detection. [tglx] - Use tglx's method to verify the existence of split lock detectoin. - small optimization of sld_update_msr() that the default value of msr_test_ctrl_cache has split_lock_detect bit cleared. - Drop the patch3 in v5 that introducing kvm_only option. [tglx] - Rebase patch4-8 to kvm/queue. - use the new kvm-cpu-cap to expose X86_FEATURE_CORE_CAPABILITIES in Patch 6.
Changes in v5: - Use X86_FEATURE_SPLIT_LOCK_DETECT flag in kvm to ensure split lock detection is really supported. - Add and export sld related helper functions in their related usecase kvm patches.
Changes in v4: - Add patch 1 to rework the initialization flow of split lock detection. - Drop percpu MSR_TEST_CTRL cache, just use a static variable to cache the reserved/unused bit of MSR_TEST_CTRL. [Sean] - Add new option for split_lock_detect kernel param. - Changlog refinement. [Sean] - Add a new patch to enable MSR_TEST_CTRL for intel guest. [Sean]
Xiaoyao Li (2): x86/split_lock: Rework the initialization flow of split lock detection x86/split_lock: Avoid runtime reads of the TEST_CTRL MSR
arch/x86/kernel/cpu/intel.c | 85 +++++++++++++++++++++---------------- 1 file changed, 48 insertions(+), 37 deletions(-)
-- 2.20.1
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