linux-kernel - Re: [PATCH] x86, boot: Allow 64bit EFI kernel to be loaded above 4G

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Message-ID: <CAE9FiQVbuQ+qMn+-V0jDQ9AomR5-k68utXdprbMhAXvXWYzd7w@mail.gmail.com>
Date:	Tue, 17 Feb 2015 23:22:39 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Baoquan He <bhe@...hat.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86, boot: Allow 64bit EFI kernel to be loaded above 4G

On Tue, Feb 10, 2015 at 10:11 PM, Baoquan He <bhe@...hat.com> wrote:
> Hi Yinghai,
>
> Could you please help to have a look at a problem which I encountered?
>
> I am trying to make kaslr randomize on both kernel physical and virtual
> address separately. Now the separate randomization has been done,
> kernel physical address can be randomized to [16M, 4G], and virtual
> address can be randomzed to [16M, 1G]. Below is the post.
> http://thread.gmane.org/gmane.linux.kernel/1870532
>
> Now I am trying to make kernel physical address randomize anywhere, not
> limited to below 4G. As you know in arch/x86/boot/compressed/head_64.S a
> identity mapping of 0~4G has been built, for address above 4G I added an
> IDT and #PF handler. Then I hardcoded the output address of
> choose_kernel_location as 5G, the #PF handler worked, however it will
> reboot in arch/x86/kernel/head_64.S.

For 64bit, I'd like to see bootloader could load kernel to random hw address.

otherwise you will need to set another ident mapping for new range.

Thanks

Yinghai
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