Linux x230 cleanup remix #1184

tlaurion · 2022-06-23T19:09:02Z

Continuing #1116 on x230 linux config tuning.

flash (minimal)
legacy (reduced)
maximized

As opposed to currently stored linux config, those are not stored in defconfig but full oldconfig format.

Rationale:
As explained under #1116 (comment) the reasoning is to facilitate linux kernel version bumps and for users to understand what changed between those directly from the configuration files.

Addition:

MMC card reader

Removal:

AMD related stuff
Many network cards that were supported in kernel since last kernel version bump.
CPU governers not linked to PERFORMANCE
Random number generators not being TPM/Intel HW support
DEBUG related stuff

This is based on top of #1178 which will hopefully be merged soon, after which this will be rebased.

The only relevant commit is WiP here, which will change until satisfaction of size comparison and functionality is met, not causing regression. Then those kernel configurations will be used to have kernel version bump, with clear differences this time.

tlaurion · 2022-06-23T20:15:29Z

Letting compile and then will :

If all above functions, do freespace comparison:

x230
x230-hotp-verification
x230-hotp-maximized

Then

Set PR to review.
Attack Not all boards are based on cryptsetup2 #1123 so that all boards, even legacy boards, can support Qubes 4.1
- If fails, go back to Quest to reduce firmware size #590 starting by Pass all modules from O2/O3 (optimized for speed) to Os (optimize for space) #1121
Bump kernel to newer version. Rinse. Repeat.

tlaurion · 2022-06-24T17:22:54Z

x230-hotp-maximized comparison (linux-x230-maximized.config linux configuration)

Master:

Name                           Offset     Type           Size   Comp
cbfs master header             0x0        cbfs header        32 none
fallback/romstage              0x80       stage           85100 none
cpu_microcode_blob.bin         0x14d80    microcode       26624 none
fallback/ramstage              0x1b600    stage           97684 none
config                         0x33400    raw               786 none
revision                       0x33780    raw               691 none
fallback/dsdt.aml              0x33a80    raw             14615 none
vbt.bin                        0x37400    raw              1433 LZMA (4281 decompressed)
cmos_layout.bin                0x37a00    cmos_layout      1884 none
fallback/postcar               0x381c0    stage           25816 none
fallback/payload               0x3e700    simple elf    7310279 none
(empty)                        0x737300   null          4360856 none
bootblock                      0xb5fdc0   bootblock       65536 none

New:

Name                           Offset     Type           Size   Comp
cbfs master header             0x0        cbfs header        32 none
fallback/romstage              0x80       stage           85100 none
cpu_microcode_blob.bin         0x14d80    microcode       26624 none
fallback/ramstage              0x1b600    stage           97685 none
config                         0x33400    raw               786 none
revision                       0x33780    raw               691 none
fallback/dsdt.aml              0x33a80    raw             14615 none
vbt.bin                        0x37400    raw              1433 LZMA (4281 decompressed)
cmos_layout.bin                0x37a00    cmos_layout      1884 none
fallback/postcar               0x381c0    stage           25816 none
fallback/payload               0x3e700    simple elf    6996935 none
(empty)                        0x6eab00   null          4674200 none
bootblock                      0xb5fdc0   bootblock       65536 none

New - old:
4674200 - 4360856
313344 free bytes gain from reducing linux-x230-maximized.config modules and features.

tlaurion · 2022-06-24T17:31:44Z

x230-hotp-verification comparison (linux-x230-legacy.config kernel configuration)

Master:

Name                           Offset     Type           Size   Comp
cbfs master header             0x0        cbfs header        32 none
fallback/romstage              0x80       stage           85100 none
cpu_microcode_blob.bin         0x14d80    microcode       26624 none
fallback/ramstage              0x1b600    stage           97687 none
config                         0x33400    raw               588 none
revision                       0x336c0    raw               691 none
fallback/dsdt.aml              0x339c0    raw             14615 none
vbt.bin                        0x37340    raw              1433 LZMA (4281 decompressed)
cmos_layout.bin                0x37940    cmos_layout      1884 none
fallback/postcar               0x38100    stage           25816 none
fallback/payload               0x3e640    simple elf    6851015 none
(empty)                        0x6c7040   null           101720 none
bootblock                      0x6dfdc0   bootblock       65536 none

New:

Name                           Offset     Type           Size   Comp
cbfs master header             0x0        cbfs header        32 none
fallback/romstage              0x80       stage           85100 none
cpu_microcode_blob.bin         0x14d80    microcode       26624 none
fallback/ramstage              0x1b600    stage           97687 none
config                         0x33400    raw               588 none
revision                       0x336c0    raw               691 none
fallback/dsdt.aml              0x339c0    raw             14615 none
vbt.bin                        0x37340    raw              1433 LZMA (4281 decompressed)
cmos_layout.bin                0x37940    cmos_layout      1884 none
fallback/postcar               0x38100    stage           25816 none
fallback/payload               0x3e640    simple elf    6537159 none
(empty)                        0x67a640   null           415576 none
bootblock                      0x6dfdc0   bootblock       65536 none

new - old gain:
415576 - 101720 = 313856 free space gain.

tlaurion · 2022-06-24T18:26:00Z

Some NOHZ: local_softirq_pending 80 from x230-flash when calling flash.sh script to flash x230-hotp-verification (linux-x230-flash.config needs review).

Might be related to CONFIG_PREEMPT being deactivated.

Readd CONFIG_PREEMPT_VOLUNTARY to test in all 3 Linux configs if resolves issue from x230-flash

tlaurion · 2022-06-29T14:48:57Z

Rechecking historical differences with https://www.kernelconfig.io/

This is aimed to ease kernel version bump, having a whole picture of config changes between boards and kernel version defaults as opposed to current savedefconfig stored format

tlaurion · 2022-06-30T15:00:20Z

Passed checklist. Nothing broke and we gained around 300k from the kernel cuts in 4.14.

tlaurion · 2022-07-01T18:56:39Z

Interesting enough, combined with #1121 we gained nearly 1mb!

x230-hotp-maximized comparison (linux-x230-maximized.config linux configuration)

Master:

Name                           Offset     Type           Size   Comp
cbfs master header             0x0        cbfs header        32 none
fallback/romstage              0x80       stage           85100 none
cpu_microcode_blob.bin         0x14d80    microcode       26624 none
fallback/ramstage              0x1b600    stage           97684 none
config                         0x33400    raw               786 none
revision                       0x33780    raw               691 none
fallback/dsdt.aml              0x33a80    raw             14615 none
vbt.bin                        0x37400    raw              1433 LZMA (4281 decompressed)
cmos_layout.bin                0x37a00    cmos_layout      1884 none
fallback/postcar               0x381c0    stage           25816 none
fallback/payload               0x3e700    simple elf    7310279 none
(empty)                        0x737300   null          4360856 none
bootblock                      0xb5fdc0   bootblock       65536 none

Local build

FMAP REGION: COREBOOT
Name                           Offset     Type           Size   Comp
cbfs master header             0x0        cbfs header        32 none
fallback/romstage              0x80       stage           85100 none
cpu_microcode_blob.bin         0x14d80    microcode       26624 none
fallback/ramstage              0x1b600    stage           97716 none
config                         0x33400    raw               791 none
revision                       0x33780    raw               696 none
fallback/dsdt.aml              0x33a80    raw             14615 none
vbt.bin                        0x37400    raw              1433 LZMA (4281 decompressed)
cmos_layout.bin                0x37a00    cmos_layout      1884 none
fallback/postcar               0x381c0    stage           25816 none
fallback/payload               0x3e700    simple elf    6522311 none
(empty)                        0x676d00   null          5148824 none
bootblock                      0xb5fdc0   bootblock       65536 none

tlaurion · 2022-07-01T18:58:29Z

We can see for x230-flash.config that some things were flatten out to be similar with legacy and maximized (less changes).

Test for linuxboot#590 (recommended as default for -9e per linuxboot#1184)

(linuxboot#1184 equivalent)

tlaurion · 2022-11-18T17:08:43Z

Continuing work under https://github.com/tlaurion/heads/tree/reassess_1184 will be forced push here when satisfactory.

A lot of things are build as modules, which are taking useless compile time since those modules are not packed under initrd.

For the moment, I will test x230-hotp-maximized to make sure there is no regression. No use of having either RETPOLINE, nor MEMBARRIER not anything of that sort under Heads, since everything is considered whiptail driven and when user does things from the unauthenticated recovery shell, we currently trust him to do the right thing under that volatile session which otherwise would change what is measured under Heads and/or would DOS the system (wiping disk is totally possible as of now).

Goal of the present work is just to build a comparative for the 3 linux configs under old 4.14 kernel, aiming to move to the same kernel used by librem boards (5.x), to both reduce CI compilation time (reuse common built stuff to economize build time) and to have merged efforts which happened under #1232, where comparing different versions is really difficult.

Goal now is to have reduced 4.14 versions to have baseline for #1121 final size gains comparisons prior of merge there, and finally merge this to go forward including NVMe support, BRTFS, LVM Thin etc, MMC card reader support which is frequently asked since avail on hardware, leading to generalize USB support to support Other Medium boot (boot from external MMC reader ISOs, external hard drive ISOs or secondary hard drive medias).

tlaurion · 2023-06-22T23:43:45Z

Included under #1381

tlaurion marked this pull request as draft June 23, 2022 19:09

tlaurion force-pushed the linux-x230_cleanup_remix branch 3 times, most recently from 129f9f0 to 7eb3c24 Compare June 23, 2022 20:03

tlaurion force-pushed the linux-x230_cleanup_remix branch 2 times, most recently from 952d2eb to 620bf98 Compare June 29, 2022 15:44

xx30 kernel config in oldconfig format

a7cf73c

This is aimed to ease kernel version bump, having a whole picture of config changes between boards and kernel version defaults as opposed to current savedefconfig stored format

tlaurion force-pushed the linux-x230_cleanup_remix branch from 620bf98 to a7cf73c Compare June 29, 2022 21:12

tlaurion marked this pull request as ready for review July 1, 2022 18:58

This was referenced Jul 1, 2022

Quest to reduce firmware size #590

Closed

Notes on bumping kernels and coreboot to newer versions (or how to keep xx30-flash and legacy boards alive) linuxboot/heads-wiki#89

Open

This was referenced Aug 2, 2022

WiP change Intel PHYsical mac (gbe) from Heads #1195

Draft

QEMU testing with OS, TPM, USB token #1188

Merged

tlaurion added a commit to tlaurion/heads that referenced this pull request Aug 17, 2022

Passing xz to xz -9e with dict=64Mib both linux bzImage and initrd.

6aea478

Test for linuxboot#590 (recommended as default for -9e per linuxboot#1184)

tlaurion added a commit to tlaurion/heads that referenced this pull request Aug 17, 2022

(fix)Passing xz to xz -9e with dict=64Mib both linux bzImage and initrd.

d5608cd

Test for linuxboot#590 (recommended as default for -9e per linuxboot#1184)

tlaurion mentioned this pull request Aug 24, 2022

Pass all modules from O2/O3 (optimized for speed) to Os (optimize for space) #1121

Merged

tlaurion mentioned this pull request Oct 21, 2022

Question: Getting rid of unneeded kernel options on Librem 14 #1229

Closed

tlaurion added a commit to tlaurion/heads that referenced this pull request Nov 18, 2022

Merge commit 'a7cf73ce43456014cd48fb10e9a3f83fd73e288f' into HEAD

7615f93

(linuxboot#1184 equivalent)

tlaurion mentioned this pull request Nov 18, 2022

Librem image shrink #1232

Merged

JonathonHall-Purism mentioned this pull request Dec 1, 2022

Kernel configs - enabled but unused modules #1249

Open

tlaurion mentioned this pull request Jan 24, 2023

t420 owners (and t430 users) : Why CONFIG_USE_OPTION_TABLE, CONFIG_STATIC_OPTION_TABLE and CONFIG_GENERIC_LINEAR_FRAMEBUFFER are defined under coreboot configs? #1293

Open

tlaurion closed this Jun 22, 2023

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Linux x230 cleanup remix #1184

Linux x230 cleanup remix #1184

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