On Tue Jan 20, 2026 at 10:53 AM CET, Alejandro Vallejo wrote: > Bus Locks are very costly and a VM left unchecked spamming instructions that > lock the memory bus (e.g: unaligned atomic CAS) makes system perf take a > nosedive. This patch is similar to BLD of VMX, but for SVM. It configures all > VMRUNs so they automatically exit at the first encounter of a buslock event, > effectively rate-limiting them.
Does this warrant an entry in the CHANGELOG? Cheers, Alejandro > > Cheers, > Alejandro > > Alejandro Vallejo (2): > x86/svm: Add infrastructure for Bus Lock Threshold > x86/svm: Intercept Bus Locks for HVM guests > > xen/arch/x86/hvm/svm/svm.c | 5 +++++ > xen/arch/x86/hvm/svm/vmcb.c | 6 ++++++ > xen/arch/x86/hvm/svm/vmcb.h | 15 +++++++++++++-- > xen/arch/x86/include/asm/hvm/svm.h | 2 ++ > xen/arch/x86/include/asm/perfc_defn.h | 2 +- > 5 files changed, 27 insertions(+), 3 deletions(-) > > > base-commit: 7b3e1b4e848d34c9a5b6634009959a7b9dd42104
