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

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