linux-kernel - Re: [PATCH v5 02/22] cc_platform: Add new attribute to prevent ACPI CPU hotplug

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Message-ID: <c4dfa4166c219b3655248e3ae3af93675db51b49.camel@intel.com>
Date:   Wed, 29 Jun 2022 21:09:06 +1200
From:   Kai Huang <kai.huang@...el.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-acpi@...r.kernel.org, seanjc@...gle.com, pbonzini@...hat.com,
        dave.hansen@...el.com, len.brown@...el.com, tony.luck@...el.com,
        rafael.j.wysocki@...el.com, reinette.chatre@...el.com,
        dan.j.williams@...el.com, peterz@...radead.org, ak@...ux.intel.com,
        kirill.shutemov@...ux.intel.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com,
        isaku.yamahata@...el.com, thomas.lendacky@....com,
        Tianyu.Lan@...rosoft.com, rdunlap@...radead.org, Jason@...c4.com,
        juri.lelli@...hat.com, mark.rutland@....com, frederic@...nel.org,
        yuehaibing@...wei.com, dongli.zhang@...cle.com
Subject: Re: [PATCH v5 02/22] cc_platform: Add new attribute to prevent ACPI
 CPU hotplug

On Tue, 2022-06-28 at 22:33 -0700, Christoph Hellwig wrote:
> On Wed, Jun 22, 2022 at 11:15:43PM +1200, Kai Huang wrote:
> > Platforms with confidential computing technology may not support ACPI
> > CPU hotplug when such technology is enabled by the BIOS.  Examples
> > include Intel platforms which support Intel Trust Domain Extensions
> > (TDX).
> 
> What does this have to to wit hthe cc_platform abstraction?  This is
> just an intel implementation bug because they hastended so much into
> implementing this.  So the quirks should not overload the cc_platform
> abstraction.
> 

Thanks for feedback.  I thought there might be similar technologies and it would
be better to have a common attribute.  I'll give up this approach and change to
use arch-specific check.

-- 
Thanks,
-Kai