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From: John Dorminy <jdorminy@redhat.com>
To: tip-bot2@linutronix.de
Cc: anjaneya.chagam@intel.com, bp@suse.de, dan.j.williams@intel.com,
	linux-kernel@vger.kernel.org, linux-tip-commits@vger.kernel.org,
	stable@vger.kernel.org, x86@kernel.org
Subject: Re: [tip: x86/urgent] x86/boot: Pull up cmdline preparation and early param parsing
Date: Thu,  9 Dec 2021 09:38:10 -0500	[thread overview]
Message-ID: <20211209143810.452527-1-jdorminy@redhat.com> (raw)
In-Reply-To: <163697618022.414.12673958553611696646.tip-bot2@tip-bot2>

Greetings;

It seems that this patch causes a mem= parameter to the kernel to have no effect, unfortunately... 

As far as I understand, the x86 mem parameter handler parse_memopt() (called by parse_early_param()) relies on being called after e820__memory_setup(): it simply removes any memory above the specified limit at that moment, allowing memory to later be hotplugged without regard for the initial limit. However, the initial non-hotplugged memory must already have been set up, in e820__memory_setup(), so that it can be removed in parse_memopt(); if parse_early_param() is called before e820__memory_setup(), as this change does, the parameter ends up having no effect.

I apologize that I don't know how to fix this, but I'm happy to test patches.

Typical dmesg output showing the lack of effect, built from the prior change and this change:

With a git tree synced to 8d48bf8206f77aa8687f0e241e901e5197e52423^ (working):
[    0.000000] Command line: BOOT_IMAGE=(hd0,msdos1)/boot/vmlinuz-5.16.0-rc1 root=UUID=a4f7bd84-4f29-40bc-8c98-f4a72d0856c4 ro net.ifnames=0 crashkernel=128M mem=4G
...
[    0.000000] BIOS-provided physical RAM map:
[    0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009abff] usable
[    0.000000] BIOS-e820: [mem 0x000000000009ac00-0x000000000009ffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000000e0000-0x00000000000fffff] reserved
[    0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000007dd3afff] usable
[    0.000000] BIOS-e820: [mem 0x000000007dd3b000-0x000000007deeffff] reserved
[    0.000000] BIOS-e820: [mem 0x000000007def0000-0x000000007e0d3fff] ACPI NVS
[    0.000000] BIOS-e820: [mem 0x000000007e0d4000-0x000000007f367fff] reserved
[    0.000000] BIOS-e820: [mem 0x000000007f368000-0x000000007f7fffff] ACPI NVS
[    0.000000] BIOS-e820: [mem 0x0000000080000000-0x000000008fffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fed1c000-0x00000000fed3ffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000ff000000-0x00000000ffffffff] reserved
[    0.000000] BIOS-e820: [mem 0x0000000100000000-0x000000207fffffff] usable
[    0.000000] e820: remove [mem 0x100000000-0xfffffffffffffffe] usable
[    0.000000] NX (Execute Disable) protection: active
[    0.000000] user-defined physical RAM map:
[    0.000000] user: [mem 0x0000000000000000-0x000000000009abff] usable
[    0.000000] user: [mem 0x000000000009ac00-0x000000000009ffff] reserved
[    0.000000] user: [mem 0x00000000000e0000-0x00000000000fffff] reserved
[    0.000000] user: [mem 0x0000000000100000-0x000000007dd3afff] usable
[    0.000000] user: [mem 0x000000007dd3b000-0x000000007deeffff] reserved
[    0.000000] user: [mem 0x000000007def0000-0x000000007e0d3fff] ACPI NVS
[    0.000000] user: [mem 0x000000007e0d4000-0x000000007f367fff] reserved
[    0.000000] user: [mem 0x000000007f368000-0x000000007f7fffff] ACPI NVS
[    0.000000] user: [mem 0x0000000080000000-0x000000008fffffff] reserved
[    0.000000] user: [mem 0x00000000fed1c000-0x00000000fed3ffff] reserved
[    0.000000] user: [mem 0x00000000ff000000-0x00000000ffffffff] reserved
...
[    0.025617] Memory: 1762876K/2061136K available (16394K kernel code, 3568K rwdata, 10324K rodata, 2676K init, 4924K bss, 298000K reserved, 0K cma-reserved)

Synced 8d48bf8206f77aa8687f0e241e901e5197e52423 (not working):

[    0.000000] Command line: BOOT_IMAGE=(hd0,msdos1)/boot/vmlinuz-5.16.0-rc4+ root=UUID=0e750e61-b92e-4708-a974-c50a3fb7e969 ro net.ifnames=0 crashkernel=128M mem=4G
[    0.000000] e820: remove [mem 0x100000000-0xfffffffffffffffe] usable
[    0.000000] BIOS-provided physical RAM map:
[    0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009abff] usable
[    0.000000] BIOS-e820: [mem 0x000000000009ac00-0x000000000009ffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000000e0000-0x00000000000fffff] reserved
[    0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000007dd3afff] usable
[    0.000000] BIOS-e820: [mem 0x000000007dd3b000-0x000000007deeffff] reserved
[    0.000000] BIOS-e820: [mem 0x000000007def0000-0x000000007e0d3fff] ACPI NVS
[    0.000000] BIOS-e820: [mem 0x000000007e0d4000-0x000000007f367fff] reserved
[    0.000000] BIOS-e820: [mem 0x000000007f368000-0x000000007f7fffff] ACPI NVS
[    0.000000] BIOS-e820: [mem 0x0000000080000000-0x000000008fffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fed1c000-0x00000000fed3ffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000ff000000-0x00000000ffffffff] reserved
[    0.000000] BIOS-e820: [mem 0x0000000100000000-0x000000207fffffff] usable
[    0.000000] NX (Execute Disable) protection: active
[    0.000000] user-defined physical RAM map:
[    0.000000] user: [mem 0x0000000000000000-0x000000000009abff] usable
[    0.000000] user: [mem 0x000000000009ac00-0x000000000009ffff] reserved
[    0.000000] user: [mem 0x00000000000e0000-0x00000000000fffff] reserved
[    0.000000] user: [mem 0x0000000000100000-0x000000007dd3afff] usable
[    0.000000] user: [mem 0x000000007dd3b000-0x000000007deeffff] reserved
[    0.000000] user: [mem 0x000000007def0000-0x000000007e0d3fff] ACPI NVS
[    0.000000] user: [mem 0x000000007e0d4000-0x000000007f367fff] reserved
[    0.000000] user: [mem 0x000000007f368000-0x000000007f7fffff] ACPI NVS
[    0.000000] user: [mem 0x0000000080000000-0x000000008fffffff] reserved
[    0.000000] user: [mem 0x00000000fed1c000-0x00000000fed3ffff] reserved
[    0.000000] user: [mem 0x00000000ff000000-0x00000000ffffffff] reserved
[    0.000000] user: [mem 0x0000000100000000-0x000000207fffffff] usable
...
[    0.695267] Memory: 131657608K/134181712K available (16394K kernel code, 3568K rwdata, 10328K rodata, 2676K init, 4924K bss, 2523844K reserved, 0K cma-reserved)


  reply	other threads:[~2021-12-09 14:38 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-20 12:04 [PATCH v2] x86/setup: call early_reserve_memory() earlier Juergen Gross
2021-09-21  0:01 ` Marek Marczykowski-Górecki
2021-09-21  3:59 ` Nathan Chancellor
2021-09-22 17:18 ` [tip: x86/urgent] x86/setup: Call " tip-bot2 for Juergen Gross
2021-11-04  5:38   ` Williams, Dan J
2021-11-04 11:40     ` Borislav Petkov
2021-11-04 17:36       ` Dan Williams
2021-11-15 11:36     ` [tip: x86/urgent] x86/boot: Pull up cmdline preparation and early param parsing tip-bot2 for Borislav Petkov
2021-12-09 14:38       ` John Dorminy [this message]
2021-12-09 15:19         ` Borislav Petkov
2021-12-09 15:26           ` Juergen Gross
2021-12-09 15:28             ` Borislav Petkov
2021-12-09 16:29               ` Mike Rapoport
2021-12-09 16:37                 ` Borislav Petkov
2021-12-10 11:28                   ` Borislav Petkov
2021-12-10 20:11                     ` Hugh Dickins
2021-12-11 10:14                       ` Borislav Petkov
2021-12-10 20:32                     ` Patrick J. Volkerding
2021-12-11 10:29                       ` Borislav Petkov
2021-12-11  5:24                     ` John Dorminy
2021-12-11 10:30                       ` Borislav Petkov
2021-12-13  8:20                     ` Mike Rapoport
2021-12-13  9:33                       ` Borislav Petkov
     [not found]                         ` <CANGBn69pGb-nscv8tXN1UKDEQGEMWRKuPVPLgg+q2m7V_sBvHw@mail.gmail.com>
2021-12-20 18:49                           ` Patrick J. Volkerding
2021-12-20 18:59                             ` Borislav Petkov
2021-12-20 19:08                               ` Borislav Petkov
2021-12-09 15:49           ` John Dorminy
2021-12-09 16:07             ` Borislav Petkov

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