On Sun, Apr 28, 2024 at 11:08 PM Ravi Bangoria <ravi.bangoria@xxxxxxx> wrote: > > Upcoming AMD uarch will support Bus Lock Detect (called Bus Lock Trap > in AMD docs). Add support for the same in Linux. Bus Lock Detect is > enumerated with cpuid CPUID Fn0000_0007_ECX_x0 bit [24 / BUSLOCKTRAP]. > It can be enabled through MSR_IA32_DEBUGCTLMSR. When enabled, hardware > clears DR6[11] and raises a #DB exception on occurrence of Bus Lock if > CPL > 0. More detail about the feature can be found in AMD APM[1]. > > [1]: AMD64 Architecture Programmer's Manual Pub. 40332, Rev. 4.07 - June > 2023, Vol 2, 13.1.3.6 Bus Lock Trap > https://bugzilla.kernel.org/attachment.cgi?id=304653 Is there any chance of getting something similar to Intel's "VMM bus-lock detection," which causes a trap-style VM-exit on a bus lock event?
