linux-kernel - Re: [PATCH] x86/kexec: always ensure EFI systab region is mapped

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Date:   Wed, 24 Apr 2019 02:47:32 +0000
From:   Junichi Nomura <j-nomura@...jp.nec.com>
To:     Kairui Song <kasong@...hat.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Borislav Petkov" <bp@...en8.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Chao Fan <fanc.fnst@...fujitsu.com>,
        Baoquan He <bhe@...hat.com>, Dave Young <dyoung@...hat.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "kexec@...ts.infradead.org" <kexec@...ts.infradead.org>
Subject: Re: [PATCH] x86/kexec: always ensure EFI systab region is mapped

On 4/24/19 2:15 AM, Kairui Song wrote:
> On Mon, Apr 22, 2019 at 11:21 PM Junichi Nomura <j-nomura@...jp.nec.com> wrote:
>> Is the mapping of ACPI tables just by luck, too?
> 
> Good question, they should have same issue with systab, I ignored this one.
> Then in first kernel when doing kexec it should ensure both ACPI
> tables and the EFI systab are mapped, that should cover everything and
> make it work.

Right.

> Is there anything else missing?
No, as far as I looked around get_rsdp_addr().

-- 
Jun'ichi Nomura, NEC Corporation / NEC Solution Innovators, Ltd.