[patch 0/4 v3] kexec-tools: efi runtime support

Dave Young dyoung at redhat.com
Thu Nov 21 01:47:18 EST 2013

On 11/21/13 at 02:40pm, Dave Young wrote:
> Hi,
> This is the v3 patchset for adding efi runtime support on kexec kernel
> kernel patches was sent a while ago, not yet updated in archive. 

Here it is:

> in kexec-tools, this patchset will do below:
> 1. retrieve efi_info from sysfs boot_params, and fill the
> x86 setup header. If kernel does not export sysfs boot_params,
> still try to find them in debugfs.
> 2. collect data efi runtime needed:
> /sys/firmware/efi/systab: smbios
> /sys/firmware/efi/fw_vendor
> /sys/firmware/efi/runtime
> /sys/firmware/efi/config_table
> /sys/firmware/efi/runtime-map/*, the phys-virt mappings in 1st kernel
> 3. assemble setup_data based on data get in 2) then pass it to 2nd kernel
> Tested on OVMF, dell laptop, lenovo laptop and HP workstation
> TODO: add functions for easily adding setup_data, arrange them as link list
> because we probably will add e820 memory ranges as setup_data as well.
> I do not prefer to bloat this patchset anymore, so I'd likt to address this
> issue after the efi runtime issue finished unless people request.
> V2 changelog:
> Address comments from
> Simon:
>   coding style, fixed a mem leak
> HPA:
>   use type uint64_t instead of __uint64_t
> mjg:
>   do not cause regression for loading old kernel
>   use xloadflags to check the bzImage support for efi.
>   in case old kernel, do not pass efi_info and setup_data
>   for new kernel, do not pass acpi_rsdp
> Vivek:
>   suggest to export a value in bzImage probe for efi support
>   so it can be used to check if we should pass acpi_rsdp.
> V3 changelog:
> 01/04: new patch of a building fix
> try sysfs firstly for boot params
> add checking of efi memory range description version, bail out if it's not 1
> error handling improvement and some cleanups
> --
> Thanks
> Dave
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