Re: [PATCH v3 0/9] Parallel CPU bringup for x86_64

[Tom Lendacky]

On 12/15/21 8:56 AM, David Woodhouse wrote:
> Doing the INIT/SIPI/SIPI in parallel for all APs and *then* waiting for
> them shaves about 80% off the AP bringup time on a 96-thread socket
> Skylake box (EC2 c5.metal) — from about 500ms to 100ms.
>
> There are more wins to be had with further parallelisation, but this is
> the simple part.

I applied this series and began booting a regular non-SEV guest and hit a 
failure at 39 vCPUs. No panic or warning, just a reset and OVMF was 
executing again. I'll try to debug what's going, but not sure how quickly 
I'll arrive at anything.

Thanks,
Tom