linux-kernel - Re: [PATCH] x86: only load initrd above 4g on second try

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Message-ID: <CAE9FiQXRZ8j-d=qOji7D_mBeSurXbwMz52UYgd1C04ihV9K0NA@mail.gmail.com>
Date:	Wed, 27 Aug 2014 11:50:25 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Matt Fleming <matt.fleming@...el.com>,
	Ingo Molnar <mingo@...hat.com>,
	Mantas Mikulėnas <grawity@...il.com>,
	Anders Darander <anders@...rgestorm.se>,
	linux-efi@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: only load initrd above 4g on second try

On Wed, Aug 27, 2014 at 10:49 AM, H. Peter Anvin <hpa@...or.com> wrote:
> On 08/26/2014 03:05 PM, Yinghai Lu wrote:
> This does, however, suggest at least two possible solutions:
>
> 1. We can read the initramfs into a temporary buffer and memcpy() it to
> the target.
>
> 2. We might be able to align the initramfs buffer to a 512-byte section
> and then round up the size.
>
> The 512 bytes here is probably a hardware sector, I'm not sure how this
> will play on 4K-hard-sectored media, although those are few and far between.

efi_high_alloc() already round up the buffer size with EFI_PAGE_SIZE
(it is 4KiB now), and the buffer is aligned to EFI_PAGE_SIZE.

Yinghai
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