linux-kernel - Re: [PATCH 1/2] UEFI arm64: add noefi boot param

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Date:	Thu, 7 Aug 2014 14:19:45 +0800
From:	Dave Young <dyoung@...hat.com>
To:	Matt Fleming <matt@...sole-pimps.org>
Cc:	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Leif Lindholm <leif.lindholm@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Matt Fleming <matt.fleming@...el.com>,
	Mark Salter <msalter@...hat.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>
Subject: Re: [PATCH 1/2] UEFI arm64: add noefi boot param

On 08/06/14 at 03:18pm, Matt Fleming wrote:
> On Wed, 06 Aug, at 04:10:45PM, Ard Biesheuvel wrote:
> > 
> > Shouldn't we clear the bit here if we failed to enable runtime
> > services for some reason? Other code may test the bit assuming that it
> > signifies that runtime services have been enabled successfully, while
> > this patch changes it to mean that we /intended/ to enable them, which
> > is not quite the same thing.
> 
> Yep, good catch. We need to do something similar for efi_runtime_init()
> on x86 too.

The current efi_runtime_init() enables the bit after getting the efi callback
phyaddr of SetVirtualAddressMap.

Thinking more about it, since SetVirtualAddressMap() could fail somehow it
seems better to set EFI_RUNTIME_SERIVCES bit only when enter virtual mode
return EFI_SUCCESS.

Does it make sense to you, Matt?

Thanks
Dave
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