linux-kernel - Re: [EXTERNAL][PATCH v16 8/8] x86/smpboot: Allow parallel bringup for SEV-ES

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Date:   Thu, 23 Mar 2023 22:30:52 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Borislav Petkov <bp@...en8.de>,
        Tom Lendacky <thomas.lendacky@....com>,
        "usama.arif@...edance.com" <usama.arif@...edance.com>
Cc:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "brgerst@...il.com" <brgerst@...il.com>,
        "arjan@...ux.intel.com" <arjan@...ux.intel.com>,
        "hewenliang4@...wei.com" <hewenliang4@...wei.com>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "simon.evans@...edance.com" <simon.evans@...edance.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "oleksandr@...alenko.name" <oleksandr@...alenko.name>,
        "kim.phillips@....com" <kim.phillips@....com>,
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        "paulmck@...nel.org" <paulmck@...nel.org>,
        "Rapan, Sabin" <sabrapan@...zon.com>,
        "rcu@...r.kernel.org" <rcu@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>
Subject: Re: [EXTERNAL][PATCH v16 8/8] x86/smpboot: Allow parallel bringup
 for SEV-ES

On Thu, 2023-03-23 at 23:13 +0100, Borislav Petkov wrote:
> On March 23, 2023 7:28:38 PM GMT+01:00, Tom Lendacky
> <thomas.lendacky@....com> wrote:
> > 
> > I agree. But once it's there, someone somewhere in the future may
> > look and go, oh, I can call this. So I think it either needs a nice
> > comment above it about how it is currently used/called and what to
> > do if it needs to be called from someplace other than head_64.S or
> > the MSR needs to be saved/restored.
> 
> Or it could be __init and get discarded when the system is up.

Not if we have CPU hotplug. Or system suspend.

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