linux-kernel - Re: [PATCH 0/2] Kexec enabling in TDX guest

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Message-ID: <20230216181230.3jn5hebv3xkdivbx@box.shutemov.name>
Date:   Thu, 16 Feb 2023 21:12:30 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Borislav Petkov <bp@...en8.de>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Isaku Yamahata <isaku.yamahata@...el.com>, x86@...nel.org,
        linux-coco@...ts.linux.dev, kexec@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] Kexec enabling in TDX guest

On Thu, Feb 16, 2023 at 09:50:32AM -0800, Dave Hansen wrote:
> On 2/13/23 15:48, Kirill A. Shutemov wrote:
> > The patch brings basic enabling of kexec in TDX guests.
> > 
> > By "basic enabling" I mean, kexec in the guests with a single CPU.
> > TDX guests use ACPI MADT MPWK to bring up secondary CPUs. The mechanism
> > doesn't allow to put a CPU back offline if it has woken up.
> > 
> > We are looking into this, but it might take time.
> 
> This is simple enough.  But, nobody will _actually_ use this code as-is,
> right?  What's the point of applying it now?

Why nobody? Single CPU VMs are not that uncommon.

-- 
  Kiryl Shutsemau / Kirill A. Shutemov