Re: [PATCH v2] pc: q35: Bump max_cpus to 1856 vcpus

[Gerd Hoffmann]

On Wed, Jan 31, 2024 at 08:19:06AM +0530, Ani Sinha wrote:
 
> This error exists only with edk2. Seabios currently can boot a linux guest
> fine with 4096 vcpus. Since the lowest common denominator for a working VM for
> both edk2 and seabios is 1856 vcpus, bump up the value max_cpus to 1856 for 
> q35
> machines versions 9 and newer. Q35 machines versions 8.2 and older continue
> to support 1024 maximum vcpus as before for compatibility reasons.

There is a high chance this limit will be gone soon.

https://github.com/kraxel/edk2/commit/7a03c17f0f4f4a9003d77db2660c8e087604b2f0

If 4096 works fine with seabios, I'd suggest to go with 4096 as limit.

take care,
  Gerd