[PATCH v4 00/12] kexec kernel efi runtime support

Dave Young
2013-11-26T05:57:45Z

Hi,

Here is the V4 resend for supporting kexec kernel efi runtime.
Per pervious discussion I pass the 1st kernel efi runtime mapping
via setup_data to 2nd kernel. Besides of the runtime mapping
info I also pass the fw_vendor, runtime, config table, smbios
physical address in setup_data. EFI spec mentioned fw_vendor,
runtime, config table addresses will be converted to virt address
after entering virtual mode, but we will use it as physical address
in efi_init. For smbios EFI spec did not mention about the address
updating, but during my test on a HP workstation, the bios will
convert it to Virt addr, thus pass it in setup_data as well.

For fw_vendor, runtime, config table, I export them in /sys/firmware/
efi/, smbios is already in /sys/firmware/efi/systab.

For efi runtime mapping I add a new directory /sys/firmware/efi/
runtime-map/ like below
[dave@darkstar ~]$ tree /sys/firmware/efi/runtime-map/
/sys/firmware/efi/runtime-map/
├── 0
│ ├── attribute
│ ├── num_pages
│ ├── phys_addr
│ ├── type
│ └── virt_addr
├── 1
│ ├── attribute
│ ├── num_pages
│ ├── phys_addr
│ ├── type
│ └── virt_addr
[snip]

kexec-tools will assemble them as setup_data and pass to 2nd kernel.
I will send userspace patches as well.

Limitation is I only write support for x86_64, test on below machines:
Lenovo thinkpad t420
Dell inspiron 14 - 3421
HP Z420 workstation
Qemu + OVMF

Please help to review the patches.

The patches are based on matt's efi master tree

Changes from v1:
add one flag in xloadflags, so kexec-tools can safely load old kernel
without efi support.
coding style fixes
function name for map phys_addr to fixed virt_addr
Add ABI documentation for sysfs files

Changes from v2:
01/09: a new patch to remove unused variables in __map_region function
catched by Toshi Kani
09/09: a new patch to export x86 boot_params to sysfs instead of use
debugfs files
Matt: reuse __map_region instead do same thing in another function.
add a wrapper function efi_map_region_fixed [02/09]
check return value of krealloc
sysfs dir name s/efi-runtime-map/runtime-map [06/09]
use desc_size in efi_runtime_map
for the xloadflags defination: +&& defined(CONFIG_KEXEC)
Greg: sysfs : one file one value for fw_vendor, runtime, tables. [05/09]
Document them in ABI testing
HPA: Document the new xloadflag
Also there's other function cleanup and improvement for error handling.

Changes from v3:
Greg: sysfs code move to use __ATTR_RO and attr_group
Boris: comments and code alignment

Added 3 new patches below
10-print-efi-runtime-memmap.patch
- 10/12: print only runtime ranges in case EFI_DEBUG printing
11-reserve-setup-data-late.patch
- fix a bug of kdump kernel, move function for reserving setup data
ranges late after parsing memmap= cmdline params because kdump kernel
will pass exact memmap late.
12-x86-kdebugfs-use-ioremap.patch
- fix a bug of x86/kernel/kdebugfs.c, use ioremap instead of __va for
low mem because __va does not work for exact memmap=

Dave Young (12):
efi: remove unused variables in __map_region
efi: add a wrapper function efi_map_region_fixed
efi: reserve boot service fix
efi: cleanup efi_enter_virtual_mode function
efi: export more efi table variable to sysfs
efi: export efi runtime memory mapping to sysfs
efi: passing kexec necessary efi data via setup_data
efi: only print saved efi runtime maps instead of all memmap ranges
for kexec
x86: add xloadflags bit for efi runtime support on kexec
x86: export x86 boot_params to sysfs
x86: reserve setup_data ranges late after parsing memmap cmdline
x86: kdebugfs do not use __va for getting setup_data virt addr

Documentation/ABI/testing/sysfs-firmware-efi | 26 ++
.../ABI/testing/sysfs-firmware-efi-runtime-map | 45 +++
Documentation/ABI/testing/sysfs-kernel-boot_params | 40 +++
Documentation/x86/boot.txt | 3 +
arch/x86/boot/header.S | 9 +-
arch/x86/include/asm/efi.h | 13 +
arch/x86/include/uapi/asm/bootparam.h | 2 +
arch/x86/kernel/Makefile | 2 +-
arch/x86/kernel/kdebugfs.c | 35 +--
arch/x86/kernel/ksysfs.c | 339 +++++++++++++++++++++
arch/x86/kernel/setup.c | 7 +-
arch/x86/platform/efi/efi.c | 313 +++++++++++++++----
arch/x86/platform/efi/efi_32.c | 2 +
arch/x86/platform/efi/efi_64.c | 16 +-
drivers/firmware/efi/Kconfig | 10 +
drivers/firmware/efi/Makefile | 1 +
drivers/firmware/efi/efi.c | 47 ++-
drivers/firmware/efi/runtime-map.c | 199 ++++++++++++
include/linux/efi.h | 9 +
19 files changed, 1028 insertions(+), 90 deletions(-)
create mode 100644 Documentation/ABI/testing/sysfs-firmware-efi
create mode 100644 Documentation/ABI/testing/sysfs-firmware-efi-runtime-map
create mode 100644 Documentation/ABI/testing/sysfs-kernel-boot_params
create mode 100644 arch/x86/kernel/ksysfs.c
create mode 100644 drivers/firmware/efi/runtime-map.c

--
1.8.3.1

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