linux-kernel - Re: [PATCH 15/15] kexec: Support kexec/kdump on EFI systems

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Date:	Tue, 1 Jul 2014 20:46:05 +0100
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
	ebiederm@...ssion.com, hpa@...or.com, mjg59@...f.ucam.org,
	greg@...ah.com, bp@...en8.de, dyoung@...hat.com,
	chaowang@...hat.com, bhe@...hat.com, akpm@...ux-foundation.org,
	linux-efi@...r.kernel.org
Subject: Re: [PATCH 15/15] kexec: Support kexec/kdump on EFI systems

On Thu, 26 Jun, at 04:33:44PM, Vivek Goyal wrote:
> This patch does two thigns. It passes EFI run time mappings to second
> kernel in bootparams efi_info. Second kernel parse this info and create
> new mappings in second kernel. That means mappings in first and second
> kernel will be same. This paves the way to enable EFI in kexec kernel.
> 
> This patch also prepares and passes EFI setup data through bootparams.
> This contains bunch of information about various tables and their
> addresses.
> 
> These information gathering and passing has been written along the lines
> of what current kexec-tools is doing to make kexec work with UEFI.
> 
> Signed-off-by: Vivek Goyal <vgoyal@...hat.com>
> CC: linux-efi@...r.kernel.org
> ---
>  arch/x86/kernel/kexec-bzimage64.c  | 146 ++++++++++++++++++++++++++++++++++---
>  drivers/firmware/efi/runtime-map.c |  21 ++++++
>  include/linux/efi.h                |  19 +++++
>  3 files changed, 174 insertions(+), 12 deletions(-)

[...]

> diff --git a/drivers/firmware/efi/runtime-map.c b/drivers/firmware/efi/runtime-map.c
> index 97cdd16..40f2213 100644
> --- a/drivers/firmware/efi/runtime-map.c
> +++ b/drivers/firmware/efi/runtime-map.c
> @@ -138,6 +138,27 @@ add_sysfs_runtime_map_entry(struct kobject *kobj, int nr)
>  	return entry;
>  }
>  
> +int get_efi_runtime_map_size(void)
> +{
> +	return nr_efi_runtime_map * efi_memdesc_size;
> +}
> +
> +int get_efi_runtime_map_desc_size(void)
> +{
> +	return efi_memdesc_size;
> +}
> +
> +int efi_runtime_map_copy(void *buf, size_t bufsz)
> +{
> +	size_t sz = get_efi_runtime_map_size();
> +
> +	if (sz > bufsz)
> +		sz = bufsz;
> +
> +	memcpy(buf, efi_runtime_map, sz);
> +	return 0;
> +}

Could we prefix these with efi_, e.g. efi_get_runtime_map_size() ?

-- 
Matt Fleming, Intel Open Source Technology Center
--
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