linux-kernel - Re: [PATCH v2 0/2] Make it possible to reserve memory on 64bit platform

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Date:   Sun, 17 Jan 2021 11:02:28 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     Wesley Zhao <zhaowei1102@...ndersoft.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Kees Cook <keescook@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>, kerneldev@...smulder.nl,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Joe Perches <joe@...ches.com>, gpiccoli@...onical.com,
        aquini@...hat.com, gustavoars@...nel.org, ojeda@...nel.org,
        ndesaulniers@...ogle.com,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        David Hildenbrand <david@...hat.com>, guohanjun@...wei.com,
        mchehab+huawei@...nel.org
Subject: Re: [PATCH v2 0/2] Make it possible to reserve memory on 64bit platform

On Sat, Jan 16, 2021 at 2:43 AM Wesley Zhao <zhaowei1102@...ndersoft.com> wrote:
>
> I was trying to reserve some memory to save logs incase that Android panic or hang and then
> I can read the logs from QNX side from the memory reserved before on the Qualcomm 8155 hypervisor platform,
> and I find the "reserve=" parameter only support 32bit,so I made some change and send these patches.

See Documentation/admin-guide/kernel-parameters.txt

        memmap=nn[KMG]$ss[KMG]
                        [KNL,ACPI] Mark specific memory as reserved.
                        Region of memory to be reserved is from ss to ss+nn.
                        Example: Exclude memory from 0x18690000-0x1869ffff
                                 memmap=64K$0x18690000
                                 or
                                 memmap=0x10000$0x18690000
                        Some bootloaders may need an escape character
before '$',
                        like Grub2, otherwise '$' and the following number
                        will be eaten.