Messages in this thread | | | Date | Thu, 21 Nov 2013 14:17:04 +0800 | From | dyoung@redhat ... | Subject | [patch 0/9 v3] kexec kernel efi runtime support |
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Hi,
Here is the V3 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/ âââ 0 â âââ attribute â âââ num_pages â âââ phys_addr â âââ type â âââ virt_addr âââ 1 â âââ attribute â âââ num_pages â âââ phys_addr â âââ type â âââ 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.
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