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

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Message-ID: <f32f1f77-c707-ae19-ae1a-dc0a37fa9806@intel.com>
Date:   Fri, 24 Feb 2023 07:22:18 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        David Woodhouse <dwmw2@...radead.org>
Cc:     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 2/24/23 06:30, Kirill A. Shutemov wrote:
> Ideally, it has to be addressed on BIOS level: it has to provide a way to
> offline CPUs, putting it back to pre-wakeup state.

Is there anything stopping us from just parking the CPUs in a loop
looking at 'acpi_mp_wake_mailbox_paddr'?  Basically park them in a way
which is indistinguishable from what the BIOS did.