linux-kernel - Re: [patch 0/9 v3] kexec kernel efi runtime support

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Date:	Fri, 22 Nov 2013 15:29:45 -0700
From:	Toshi Kani <toshi.kani@...com>
To:	dyoung@...hat.com
Cc:	linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
	x86@...nel.org, mjg59@...f.ucam.org, hpa@...or.com,
	James.Bottomley@...senPartnership.com, vgoyal@...hat.com,
	ebiederm@...ssion.com, horms@...ge.net.au,
	kexec@...ts.infradead.org, bp@...en8.de, greg@...ah.com,
	matt@...sole-pimps.org
Subject: Re: [patch 0/9 v3] kexec kernel efi runtime support

On Thu, 2013-11-21 at 14:17 +0800, dyoung@...hat.com wrote:
> 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@...kstar ~]$ 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

Tested on an HP EFI-based 60-way server (prototype).  For the series:

Tested-by: Toshi Kani <toshi.kani@...com>

Thanks,
-Toshi


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