[Bug 217799] kvm: Windows Server 2003 VM fails to work on 6.1.44 (works fine on 6.1.43)

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=217799

Bagas Sanjaya (bagasdotme@gmail.com) changed:

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                 CC|                            |bagasdotme@gmail.com

--- Comment #2 from Bagas Sanjaya (bagasdotme@gmail.com) ---
(In reply to Roman Mamedov from comment #0)
> Hello,
> 
> I have a virtual machine running the old Windows Server 2003. On kernels
> 6.1.44 and 6.1.45, the QEMU VNC window stays dark, not switching to any of
> the guest's video modes and the VM process uses only ~64 MB of RAM of the
> assigned 2 GB, indefinitely. It's like the VM is paused/halted/stuck before
> even starting. The process can be killed successfully and then restarted
> again (with the same result), so it is not deadlocked in kernel or the like.
> 
> Kernel 6.1.43 works fine.
> 
> I have also tried downgrading CPU microcode from 20230808 to 20230719, but
> that did not help.
> 
> The CPU is AMD Ryzen 5900. I suspect some of the newly added mitigations may
> be the culprit?

Can you do bisection between v6.1.44 and v6.1.45 to find out the specific
mitigation that have this regression?

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