[Bug 219787] Guest's applications crash with EXCEPTION_SINGLE_STEP (0x80000004)

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https://bugzilla.kernel.org/show_bug.cgi?id=219787

--- Comment #18 from Ravi Bangoria (ravi.bangoria@xxxxxxx) ---
(In reply to Ravi Bangoria from comment #16)
> It seems, the CPU is preserving SW written DR6[BusLockDetected] while
> generating the #DB when the CPL is 0 and DEBUGCTL[BusLockTrapEn] is set.

My bad, the behavior is same for CPL 3 as well. Apparently, it's a correct
behavior as documented in the AMD Architecture Programmer's Manual. I've posted
a KUT patch to KVM mailing list. (More details in the patch). Please review.

https://lore.kernel.org/r/20250224112601.6504-1-ravi.bangoria@xxxxxxx

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