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SubjectRe: [PATCH v9 0/8] KVM: Add virtualization support of split lock detection
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On 5/9/2020 7:05 PM, Xiaoyao Li wrote:
> This series aims to add the virtualization of split lock detection in
> KVM.
>
> Due to the fact that split lock detection is tightly coupled with CPU
> model and CPU model is configurable by host VMM, we elect to use
> paravirt method to expose and enumerate it for guest.
>
> Changes in v9
> - rebase to v5.7-rc4
> - Add one patch to rename TIF_SLD to TIF_SLD_DISABLED;
> - Add one patch to remove bogus case in handle_guest_split_lock;
> - Introduce flag X86_FEATURE_SPLIT_LOCK_DETECT_FATAL and thus drop
> sld_state;
> - Use X86_FEATURE_SPLIT_LOCK_DETECT and X86_FEATURE_SPLIT_LOCK_DETECT_FATAL
> to determine the SLD state of host;
> - Introduce split_lock_virt_switch() and two wrappers for KVM instead
> of sld_update_to();
> - Use paravirt to expose and enumerate split lock detection for guest;
> - Split lock detection can be exposed to guest when host is sld_fatal,
> even though host is SMT available.
>
> Changes in v8:
> https://lkml.kernel.org/r/20200414063129.133630-1-xiaoyao.li@intel.com
> - rebase to v5.7-rc1.
> - basic enabling of split lock detection already merged.
> - When host is sld_warn and nosmt, load guest's sld bit when in KVM
> context, i.e., between vmx_prepare_switch_to_guest() and before
> vmx_prepare_switch_to_host(), KVM uses guest sld setting.
>
> Changes in v7:
> https://lkml.kernel.org/r/20200325030924.132881-1-xiaoyao.li@intel.com
> - 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:
> https://lkml.kernel.org/r/20200324151859.31068-1-xiaoyao.li@intel.com
> - 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:
> https://lkml.kernel.org/r/20200315050517.127446-1-xiaoyao.li@intel.com
> - 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.
>
> Xiaoyao Li (8):
> x86/split_lock: Rename TIF_SLD to TIF_SLD_DISABLED
> x86/split_lock: Remove bogus case in handle_guest_split_lock()
> x86/split_lock: Introduce flag X86_FEATURE_SLD_FATAL and drop
> sld_state
> x86/split_lock: Introduce split_lock_virt_switch() and two wrappers
> x86/kvm: Introduce paravirt split lock detection enumeration
> KVM: VMX: Enable MSR TEST_CTRL for guest
> KVM: VMX: virtualize split lock detection
> x86/split_lock: Enable split lock detection initialization when
> running as an guest on KVM
>
> Documentation/virt/kvm/cpuid.rst | 29 +++++++----
> arch/x86/include/asm/cpu.h | 35 ++++++++++++++
> arch/x86/include/asm/cpufeatures.h | 1 +
> arch/x86/include/asm/thread_info.h | 6 +--
> arch/x86/include/uapi/asm/kvm_para.h | 8 ++--
> arch/x86/kernel/cpu/intel.c | 59 ++++++++++++++++-------
> arch/x86/kernel/kvm.c | 3 ++
> arch/x86/kernel/process.c | 2 +-
> arch/x86/kvm/cpuid.c | 6 +++
> arch/x86/kvm/vmx/vmx.c | 72 +++++++++++++++++++++++++---
> arch/x86/kvm/vmx/vmx.h | 3 ++
> arch/x86/kvm/x86.c | 6 ++-
> arch/x86/kvm/x86.h | 7 +++
> 13 files changed, 196 insertions(+), 41 deletions(-)
>

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