On Fri, 02 May 2025 05:03:41 +0000, Manali Shukla wrote:
> Misbehaving guests can cause bus locks to degrade the performance of
> a system. Non-WB (write-back) and misaligned locked RMW (read-modify-write)
> instructions are referred to as "bus locks" and require system wide
> synchronization among all processors to guarantee the atomicity. The bus
> locks can impose notable performance penalties for all processors within
> the system.
>
> [...]
Applied to kvm-x86 svm, with a heavily modified test, and the comment typo fix
for patch 4.
[1/5] KVM: x86: Make kvm_pio_request.linear_rip a common field for user exits
https://github.com/kvm-x86/linux/commit/e9628b011bbd
[2/5] x86/cpufeatures: Add CPUID feature bit for the Bus Lock Threshold
https://github.com/kvm-x86/linux/commit/faad6645e112
[3/5] KVM: SVM: Add architectural definitions/assets for Bus Lock Threshold
https://github.com/kvm-x86/linux/commit/827547bc3a2a
[4/5] KVM: SVM: Add support for KVM_CAP_X86_BUS_LOCK_EXIT on SVM CPUs
https://github.com/kvm-x86/linux/commit/89f9edf4c69d
[5/5] KVM: selftests: Add test to verify KVM_CAP_X86_BUS_LOCK_EXIT
https://github.com/kvm-x86/linux/commit/72df72e1c6dd
--
https://github.com/kvm-x86/linux/tree/next
