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

[bugzilla-daemon@kernel.org]

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

Ravi Bangoria (ravi.bangoria@amd.com) changed:

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                 CC|                            |ravi.bangoria@amd.com

--- Comment #12 from Ravi Bangoria (ravi.bangoria@amd.com) ---
Thanks for the bug report. This is what is probably happening:

BusLockTrap is controlled through DEBUGCTL MSR and currently DEBUGCTL MSR is
saved/restored on guest entry/exit only if LBRV is enabled. So, if BusLockTrap
is enabled on the host, it will remain enabled even after guest entry and thus,
if some process inside the guest causes a BusLock, KVM will inject #DB from
host to the guest.

I had a KVM patch[1] but couldn't get back to work on it. Let me try to
spend some time and respin it.

[1] https://lore.kernel.org/all/20240808062937.1149-5-ravi.bangoria@amd.com

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