mm-commits Archive on lore.kernel.org
 help / color / Atom feed
From: Andrew Morton <akpm@linux-foundation.org>
To: bp@alien8.de, hpa@zytor.com, mingo@redhat.com, mjg59@google.com,
	mm-commits@vger.kernel.org, rdunlap@infradead.org,
	rminnich@gmail.com, tglx@linutronix.de
Subject: + initrdmem=-option-to-specify-initrd-physical-address.patch added to -mm tree
Date: Mon, 20 Apr 2020 20:58:09 -0700
Message-ID: <20200421035809.V-kZk5iEO%akpm@linux-foundation.org> (raw)
In-Reply-To: <20200420181310.c18b3c0aa4dc5b3e5ec1be10@linux-foundation.org>


The patch titled
     Subject: initrdmem= option to specify initrd physical address
has been added to the -mm tree.  Its filename is
     initrdmem=-option-to-specify-initrd-physical-address.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/initrdmem%3D-option-to-specify-initrd-physical-address.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/initrdmem%3D-option-to-specify-initrd-physical-address.patch

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next and is updated
there every 3-4 working days

------------------------------------------------------
From: ron minnich <rminnich@gmail.com>
Subject: initrdmem= option to specify initrd physical address

This patch adds the initrdmem option:

initrdmem=ss[KMG],nn[KMG]

which is used to specify the physical address of the initrd, almost always
an address in FLASH.  It also adds code for x86 to use the existing
phys_init_start and phys_init_size variables in the kernel.  This is
useful in cases where we wish to place a kernel and initrd in FLASH, but
there is no firmware file system structure in the FLASH.

One such situation occurs when we have reclaimed unused FLASH space on
UEFI systems by, e.g., taking it from the Management Engine.  For example,
on many systems, the ME is given half the FLASH part; not only is 2.75M of
an 8M part unused; but 10.75M of a 16M part is unused.  We can use this
space to contain an initrd, but need to tell Linux where it is.

This space is "raw": due to, e.g., UEFI limitations: it can not be added
to UEFI firmware volumes without rebuilding UEFI from source or writing a
UEFI device driver.  We can reference it only as a physical address and
size.

At the same time, should we netboot a kernel or load it from GRUB or
syslinux, we want to have the option of not using the physical address
specification.  Then, should we wish, it is easy to boot the kernel and
provide an initrd; or boot the the kernel and let it use the initrd in
FLASH.  In practice this has proven to be very helpful as we integrate
Linux into FLASH on x86.

Hence, the most flexible and convenient path is to enable the initrdmem
command line flag in a way that it is the last choice tried.

For example, on the DigitalLoggers Atomic Pi, we burn an image into FLASH
with a built-in command line which includes:

initrdmem=0xff968000,0x200000
which specifies a location and size.

Link: http://lkml.kernel.org/r/CAP6exYLK11rhreX=6QPyDQmW7wPHsKNEFtXE47pjx41xS6O7-A@mail.gmail.com
Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Cc: Matthew Garrett <mjg59@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 Documentation/admin-guide/kernel-parameters.txt |    7 +++++++
 arch/x86/kernel/setup.c                         |    6 ++++++
 init/do_mounts_initrd.c                         |   13 ++++++++++++-
 3 files changed, 25 insertions(+), 1 deletion(-)

--- a/arch/x86/kernel/setup.c~initrdmem=-option-to-specify-initrd-physical-address
+++ a/arch/x86/kernel/setup.c
@@ -237,6 +237,9 @@ static u64 __init get_ramdisk_image(void
 
 	ramdisk_image |= (u64)boot_params.ext_ramdisk_image << 32;
 
+    if (ramdisk_image == 0) {
+        ramdisk_image = phys_initrd_start;
+    }
 	return ramdisk_image;
 }
 static u64 __init get_ramdisk_size(void)
@@ -245,6 +248,9 @@ static u64 __init get_ramdisk_size(void)
 
 	ramdisk_size |= (u64)boot_params.ext_ramdisk_size << 32;
 
+    if (ramdisk_size == 0) {
+        ramdisk_size = phys_initrd_size;
+    }
 	return ramdisk_size;
 }
 
--- a/Documentation/admin-guide/kernel-parameters.txt~initrdmem=-option-to-specify-initrd-physical-address
+++ a/Documentation/admin-guide/kernel-parameters.txt
@@ -1762,6 +1762,13 @@
 
 	initrd=		[BOOT] Specify the location of the initial ramdisk
 
+    initrdmem=    [KNL] Specify a physical adddress and size from which
+            to load the initrd. If an initrd is compiled in or
+            specified in the bootparams, it takes priority
+            over this setting.
+            Format: ss[KMG],nn[KMG]
+            Default is 0, 0
+
 	init_on_alloc=	[MM] Fill newly allocated pages and heap objects with
 			zeroes.
 			Format: 0 | 1
--- a/init/do_mounts_initrd.c~initrdmem=-option-to-specify-initrd-physical-address
+++ a/init/do_mounts_initrd.c
@@ -28,7 +28,7 @@ static int __init no_initrd(char *str)
 
 __setup("noinitrd", no_initrd);
 
-static int __init early_initrd(char *p)
+static int __init early_initrdmem(char *p)
 {
 	phys_addr_t start;
 	unsigned long size;
@@ -43,6 +43,17 @@ static int __init early_initrd(char *p)
 	}
 	return 0;
 }
+early_param("initrdmem", early_initrdmem);
+
+/*
+ * This is here as the initrd keyword has been in use since 11/2018
+ * on ARM, PowerPC, and MIPS.
+ * It should not be; it is reserved for bootloaders.
+ */
+static int __init early_initrd(char *p)
+{
+    return early_initrdmem(p);
+}
 early_param("initrd", early_initrd);
 
 static int init_linuxrc(struct subprocess_info *info, struct cred *new)
_

Patches currently in -mm which might be from rminnich@gmail.com are

initrdmem=-option-to-specify-initrd-physical-address.patch

  parent reply index

Thread overview: 71+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-21  1:13 incoming Andrew Morton
2020-04-21  1:13 ` [patch 01/15] sh: fix build error in mm/init.c Andrew Morton
2020-04-21  1:13 ` [patch 02/15] slub: avoid redzone when choosing freepointer location Andrew Morton
2020-04-21  1:13 ` [patch 03/15] mm/userfaultfd: disable userfaultfd-wp on x86_32 Andrew Morton
2020-04-21  1:13 ` [patch 04/15] MAINTAINERS: add an entry for kfifo Andrew Morton
2020-04-21  1:13 ` [patch 05/15] mm/hugetlb: fix a addressing exception caused by huge_pte_offset Andrew Morton
2020-04-21  1:13 ` [patch 06/15] mm, gup: return EINTR when gup is interrupted by fatal signals Andrew Morton
2020-04-21  1:13 ` [patch 07/15] checkpatch: fix a typo in the regex for $allocFunctions Andrew Morton
2020-04-21  1:14 ` [patch 08/15] tools/build: tweak unused value workaround Andrew Morton
2020-04-21  1:14 ` [patch 09/15] mm/ksm: fix NULL pointer dereference when KSM zero page is enabled Andrew Morton
2020-04-21  1:14 ` [patch 10/15] mm/shmem: fix build without THP Andrew Morton
2020-04-21  1:14 ` [patch 11/15] vmalloc: fix remap_vmalloc_range() bounds checks Andrew Morton
2020-04-21  1:14 ` [patch 12/15] shmem: fix possible deadlocks on shmlock_user_lock Andrew Morton
2020-04-21  1:14 ` [patch 13/15] mm: shmem: disable interrupt when acquiring info->lock in userfaultfd_copy path Andrew Morton
2020-04-21  1:14 ` [patch 14/15] coredump: fix null pointer dereference on coredump Andrew Morton
2020-04-21  1:14 ` [patch 15/15] tools/vm: fix cross-compile build Andrew Morton
2020-04-21  2:00 ` + mm-memory_hotplug-refrain-from-adding-memory-into-an-impossible-node.patch added to -mm tree Andrew Morton
2020-04-21  2:48 ` + x86-mm-define-mm_p4d_folded.patch " Andrew Morton
2020-04-21  2:52 ` + mm-debug-add-tests-validating-architecture-page-table-helpers-v17.patch " Andrew Morton
2020-04-21  2:59 ` + mm-mmapc-add-more-sanity-checks-to-get_unmapped_area.patch " Andrew Morton
2020-04-21  2:59 ` + mm-mmapc-do-not-allow-mappings-outside-of-allowed-limits.patch " Andrew Morton
2020-04-21  3:07 ` + initrdmem=-option-to-specify-initrd-physical-address-checkpatch-fixes.patch " Andrew Morton
2020-04-21  3:58 ` Andrew Morton [this message]
2020-04-21  5:43 ` mmotm 2020-04-20-22-43 uploaded Andrew Morton
2020-04-22  1:36 ` + mm-swapfilec-found_free-could-be-represented-by-tmp-max.patch added to -mm tree Andrew Morton
2020-04-22  1:36 ` + mm-swapfilec-tmp-is-always-smaller-than-max.patch " Andrew Morton
2020-04-22  1:36 ` + mm-swapfilec-omit-a-duplicate-code-by-compare-tmp-and-max-first.patch " Andrew Morton
2020-04-23 22:36 ` + kasan-initialise-array-in-kasan_memcmp-test.patch " Andrew Morton
2020-04-23 22:38 ` + kvm-svm-change-flag-passed-to-gup-fast-in-sev_pin_memory.patch " Andrew Morton
2020-04-23 22:41 ` + mm-pass-task-and-mm-to-do_madvise-fix.patch " Andrew Morton
2020-04-23 22:44 ` + mm-support-vector-address-ranges-for-process_madvise.patch " Andrew Morton
2020-04-23 22:44 ` + mm-support-vector-address-ranges-for-process_madvise-fix.patch " Andrew Morton
2020-04-23 22:48 ` + kasan-stop-tests-being-eliminated-as-dead-code-with-fortify_source.patch " Andrew Morton
2020-04-23 22:48 ` + stringh-fix-incompatibility-between-fortify_source-and-kasan.patch " Andrew Morton
2020-04-23 23:03 ` + powerpc-add-support-for-folded-p4d-page-tables-fix.patch " Andrew Morton
2020-04-23 23:09 ` [folded-merged] memcg-optimize-memorynuma_stat-like-memorystat-fix.patch removed from " Andrew Morton
2020-04-23 23:32 ` + slub-remove-userspace-notifier-for-cache-add-remove.patch added to " Andrew Morton
2020-04-23 23:35 ` + ocfs2-mount-shared-volume-without-ha-stack.patch " Andrew Morton
2020-04-24  0:29 ` + mm-memory_hotplug-handle-memblocks-only-with-config_arch_keep_memblock.patch " Andrew Morton
2020-04-24  1:17 ` + mm-return-true-in-cpupid_pid_unset.patch " Andrew Morton
2020-04-24  1:20 ` + kernel-better-document-the-use_mm-unuse_mm-api-contract-v2-fix.patch " Andrew Morton
2020-04-24  1:40 ` + mm-thp-rename-pmd_mknotpresent-as-pmd_mkinvalid-v2.patch " Andrew Morton
2020-04-24  1:47 ` + ipc-convert-ipcs_idr-to-xarray-update.patch " Andrew Morton
     [not found]   ` <20200605195848.GB5393@lca.pw>
     [not found]     ` <20200605201134.GJ19604@bombadil.infradead.org>
2020-06-05 21:20       ` Andrew Morton
2020-12-30 15:44   ` Manfred Spraul
2020-04-24  2:06 ` + powerpc-spufs-simplify-spufs-core-dumping.patch " Andrew Morton
2020-04-24  2:06 ` + signal-factor-copy_siginfo_to_external32-from-copy_siginfo_to_user32.patch " Andrew Morton
2020-04-24  2:06 ` + binfmt_elf-femove-the-set_fs-in-fill_siginfo_note.patch " Andrew Morton
2020-04-24  2:06 ` + binfmt_elf-remove-the-set_fskernel_ds-in-elf_core_dump.patch " Andrew Morton
2020-04-24  2:06 ` + binfmt_elf_fdpic-remove-the-set_fskernel_ds-in-elf_fdpic_core_dump.patch " Andrew Morton
2020-04-24  2:06 ` + exec-simplify-the-copy_strings_kernel-calling-convention.patch " Andrew Morton
2020-04-24  2:06 ` + exec-open-code-copy_string_kernel.patch " Andrew Morton
2020-04-24  3:24 ` + add-kernel-config-option-for-twisting-kernel-behavior.patch " Andrew Morton
2020-04-24  3:24 ` + twist-allow-disabling-k_spec-function-in-drivers-tty-vt-keyboardc.patch " Andrew Morton
2020-04-24  3:24 ` + twist-add-option-for-selecting-twist-options-for-syzkallers-testing.patch " Andrew Morton
2020-04-24  3:32 ` + eventpoll-fix-missing-wakeup-for-ovflist-in-ep_poll_callback.patch " Andrew Morton
2020-04-24  3:49 ` [obsolete] linux-next-rejects.patch removed from " Andrew Morton
2020-04-24  3:51 ` + mips-mm-add-page-soft-dirty-tracking.patch added to " Andrew Morton
2020-04-24 23:36 ` + mm-memory_hotplug-set-node_start_pfn-of-hotadded-pgdat-to-0.patch " Andrew Morton
2020-04-26  0:09 ` + mm-switch-the-test_vmalloc-module-to-use-__vmalloc_node-fix-fix.patch " Andrew Morton
2020-04-26  0:17 ` + mm-hugetlb-avoid-unnecessary-check-on-pud-and-pmd-entry-in-huge_pte_offset.patch " Andrew Morton
2020-04-26  0:29 ` + eventpoll-fix-missing-wakeup-for-ovflist-in-ep_poll_callback-v2.patch " Andrew Morton
2020-04-26  0:41 ` [withdrawn] kasan-initialise-array-in-kasan_memcmp-test.patch removed from " Andrew Morton
2020-04-26  0:41 ` + kasan-stop-tests-being-eliminated-as-dead-code-with-fortify_source-v4.patch added to " Andrew Morton
2020-04-26  0:48 ` + checkpatch-test-git_dir-changes.patch " Andrew Morton
2020-04-26  1:06 ` + mm-add-debug_wx-support.patch " Andrew Morton
2020-04-26  1:06 ` + riscv-support-debug_wx.patch " Andrew Morton
2020-04-26  1:06 ` + riscv-support-debug_wx-fix.patch " Andrew Morton
2020-04-26  1:06 ` + x86-mm-use-arch_has_debug_wx-instead-of-arch-defined.patch " Andrew Morton
2020-04-26  1:06 ` + arm64-mm-use-arch_has_debug_wx-instead-of-arch-defined.patch " Andrew Morton
2020-04-26  1:09 ` [folded-merged] initrdmem=-option-to-specify-initrd-physical-address-checkpatch-fixes.patch removed from " Andrew Morton

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200421035809.V-kZk5iEO%akpm@linux-foundation.org \
    --to=akpm@linux-foundation.org \
    --cc=bp@alien8.de \
    --cc=hpa@zytor.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mingo@redhat.com \
    --cc=mjg59@google.com \
    --cc=mm-commits@vger.kernel.org \
    --cc=rdunlap@infradead.org \
    --cc=rminnich@gmail.com \
    --cc=tglx@linutronix.de \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

mm-commits Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/mm-commits/0 mm-commits/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 mm-commits mm-commits/ https://lore.kernel.org/mm-commits \
		mm-commits@vger.kernel.org
	public-inbox-index mm-commits

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.mm-commits


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git