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[Qemu-devel] [PATCH v6 0/4] allow to load initrd below 4G for recent ker
From: |
Li Zhijian |
Subject: |
[Qemu-devel] [PATCH v6 0/4] allow to load initrd below 4G for recent kernel |
Date: |
Thu, 17 Jan 2019 20:49:00 +0800 |
Long long ago, linux kernel has supported up to 4G initrd, but it's header
still hard code to allow loading initrd below 2G only.
cutting from arch/boot/x86/header.S:
# (Header version 0x0203 or later) the highest safe address for the contents
# of an initrd. The current kernel allows up to 4 GB, but leave it at 2 GB to
# avoid possible bootloader bugs.
In order to support more than 2G initrd, qemu must allow loading initrd
above 2G address. Luckly, recent kernel introduced a new field to linux header
named xloadflags:XLF_CAN_BE_LOADED_ABOVE_4G which tells bootloader an optional
and safe address to load initrd.
It's believed that if XLF_CAN_BE_LOADED_ABOVE_4G is set, initrd can
be loaded into any address.
Default roms(Seabios + optionrom(linuxboot_dma)) works as expected with this
patchset.
I stole some comments from yours, fell free to let me know if you don't like
this.
changes:
V6: no functional changes
- Patch 3/4: Fix line over 80 characters && use double quates for all pathes
(Stefano Garzarella)
- Patch 4/4: update comments
V5: add a few reviewed-tag and update 4/4 changelog and comments
V4:
- add Reviwed-by tag to 1/4 and 2/4
- use scripts/update-linux-headers.sh to import bootparam.h
- minor fix at commit log
V3:
- rebase code basing on http://patchwork.ozlabs.org/cover/1005990 and
https://patchew.org/QEMU/address@hidden
- add new patch 3/4 to import header bootparam.h (Michael S. Tsirkin)
V2: add 2 patches(3/5, 4/5) to fix potential loading issue.
CC: Paolo Bonzini <address@hidden>
CC: Richard Henderson <address@hidden>
CC: Eduardo Habkost <address@hidden>
CC: "Michael S. Tsirkin" <address@hidden>
CC: Marcel Apfelbaum <address@hidden>
CC: Stefano Garzarella <address@hidden>
CC: Peter Crosthwaite <address@hidden>
CC: Peter Maydell <address@hidden>
Li Zhijian (4):
unify len and addr type for memory/address APIs
hw/core/loader.c: Read as long as possible in load_image_size()
i386: import & use bootparam.h
i386: allow to load initrd below 4 GB for recent linux
exec.c | 47 ++++++++++++++--------------
hw/core/loader.c | 11 +++----
hw/i386/pc.c | 29 ++++++++++++-----
include/exec/cpu-all.h | 2 +-
include/exec/cpu-common.h | 8 ++---
include/exec/memory.h | 22 ++++++-------
include/standard-headers/asm-x86/bootparam.h | 34 ++++++++++++++++++++
scripts/update-linux-headers.sh | 6 ++++
8 files changed, 105 insertions(+), 54 deletions(-)
create mode 100644 include/standard-headers/asm-x86/bootparam.h
--
2.7.4
- [Qemu-devel] [PATCH v6 0/4] allow to load initrd below 4G for recent kernel,
Li Zhijian <=
- [Qemu-devel] [PATCH v6 1/4] unify len and addr type for memory/address APIs, Li Zhijian, 2019/01/17
- [Qemu-devel] [PATCH v6 4/4] i386: allow to load initrd below 4 GB for recent linux, Li Zhijian, 2019/01/17
- [Qemu-devel] [PATCH v6 3/4] i386: import & use bootparam.h, Li Zhijian, 2019/01/17
- [Qemu-devel] [PATCH v6 2/4] hw/core/loader.c: Read as long as possible in load_image_size(), Li Zhijian, 2019/01/17
- Re: [Qemu-devel] [PATCH v6 0/4] allow to load initrd below 4G for recent kernel, Paolo Bonzini, 2019/01/21
- Re: [Qemu-devel] [PATCH v6 0/4] allow to load initrd below 4G for recent kernel, no-reply, 2019/01/31