linux-kernel - Re: [PATCH v5 1/2] x86/kexec: Build identity mapping for EFI systab and ACPI tables

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Message-ID: <20190429125059.GB2324@zn.tnic>
Date:   Mon, 29 Apr 2019 14:50:59 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Baoquan He <bhe@...hat.com>
Cc:     j-nomura@...jp.nec.com, kasong@...hat.com, dyoung@...hat.com,
        linux-kernel@...r.kernel.org, tglx@...utronix.de,
        fanc.fnst@...fujitsu.com, x86@...nel.org,
        kexec@...ts.infradead.org, hpa@...or.com
Subject: Re: [PATCH v5 1/2] x86/kexec: Build identity mapping for EFI systab
 and ACPI tables

On Sun, Apr 28, 2019 at 01:41:14PM +0800, Baoquan He wrote:
> About this place, do you think below change is OK to you?
> 
> ~~~
> The current code only builds identity mapping for physical memory during
> kexec-type loading. The regions reserved by firmware are not covered.
> In the later code change, the boot decompressing code of kexec-ed kernel
> will try to access EFI systab and ACPI tables, lacking identity mapping for
> them will cause error and reset system to firmware.

Yap, better.

Thx.

-- 
Regards/Gruss,
    Boris.

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