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AMD Prepares Linux For "Bus Lock Trap" Feature On Upcoming CPUs
An upcoming AMD micro-architecture (presumably Zen 5 given the timing and history around AMD's Linux hardware enablement...) is introducing Bus Lock Trap as a feature matching Intel's existing split/bus lock detection functionality.
One of the patches does confirm that the AMD Bus Lock Trap feature "functionally works identical to Intel." There is also support for Bus Lock Detect on AMD processors for software running within KVM virtual machines. This isn't the most exciting of features for (presumably) Zen 5 but a nice minor addition for also matching the capabilities of Intel processors for allowing the kernel to better report/handle such locks for performance and denial of service reasons.
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