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Lunev wrote: > Since kernel commit 54950bfe2b69 KVM on AMD no longer offers > bus-lock-detect. A Zen 5 guest started under an older kernel has it in > its CPUID, and QEMU filters it on the new host, so migration, restore > and snapshot revert fail (VSTOR-152291). > > Add x-bus-lock-detect-compat and turn it on in pc_vz_9_2_compat: an > AMD guest keeps a requested bus-lock-detect. The guest loses nothing > it had: bus lock detection did not work under KVM on AMD before kernel > commit 62ad461079e7, DR6 bit 11 stays fixed, and a Linux 6.13 or newer > guest only logs one "unchecked MSR access" warning when it brings a > vCPU online. > > [...] Acked-by: Andrey Drobyshev -- Andrey Drobyshev