linux-kernel - Re: [PATCH v3 1/5] efi: Add efi_init

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Date:	Wed, 26 Mar 2014 12:56:23 +0000
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Daniel Kiper <daniel.kiper@...cle.com>
Cc:	linux-efi@...r.kernel.org, linux-ia64@...r.kernel.org,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	xen-devel@...ts.xenproject.org, boris.ostrovsky@...cle.com,
	david.vrabel@...rix.com, eshelton@...ox.com, fenghua.yu@...el.com,
	hpa@...or.com, ian.campbell@...rix.com, jbeulich@...e.com,
	jeremy@...p.org, konrad.wilk@...cle.com, matt.fleming@...el.com,
	mingo@...hat.com, stefano.stabellini@...citrix.com,
	tglx@...utronix.de, tony.luck@...el.com,
	Tang Liang <liang.tang@...cle.com>
Subject: Re: [PATCH v3 1/5] efi: Add efi_init_ops variable

On Tue, 25 Mar, at 09:57:52PM, Daniel Kiper wrote:
> Add efi_init_ops variable which allows us to replace
> EFI init functions on Xen with its specific stuff.
> 
> This patch is based on Jan Beulich and Tang Liang work.
> 
> Signed-off-by: Daniel Kiper <daniel.kiper@...cle.com>
> Signed-off-by: Tang Liang <liang.tang@...cle.com>
> ---
>  arch/ia64/kernel/efi.c      |   30 +++++++++++++++++++++---------
>  arch/x86/platform/efi/efi.c |   18 +++++++++++++-----
>  drivers/firmware/efi/efi.c  |   26 ++++++++++++++++++++++++++
>  include/linux/efi.h         |    8 ++++++++
>  4 files changed, 68 insertions(+), 14 deletions(-)

[...]

> @@ -1118,6 +1118,14 @@ u64 efi_mem_attributes(unsigned long phys_addr)
>  	return 0;
>  }
>  
> +struct efi_init_ops efi_init_ops = {
> +	.efi_init = efi_init_generic,
> +	.efi_reserve_boot_services = efi_reserve_boot_services_generic,
> +	.efi_enter_virtual_mode = efi_enter_virtual_mode_generic,
> +	.efi_mem_type = efi_mem_type_generic,
> +	.efi_mem_attributes = efi_mem_attributes_generic
> +};

Please don't create another struct of EFI function pointers.

After this we'll have 3 global efi structures defintions and 4 global
efi objects on x86,

  - struct efi_early [in the boot stub]
  - struct efi ['efi_phys' before/'efi' after SetVirtualAddressMap()]
  - struct efi_init_ops [for the benefit of xen]

I have a big problem with exposing .efi_reserve_boot_services as an API.

Also, the fact that in later patches you're copying chunks of the x86
virt_*() funtions suggests to me that this has been implemented at the
wrong layer, because it actively discourages sharing code between x86
and Xen.

-- 
Matt Fleming, Intel Open Source Technology Center
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