Re: [PATCH] x86, boot: Allow 64bit EFI kernel to be loaded above 4G
From: Yinghai Lu
Date: Wed Feb 18 2015 - 02:22:45 EST
On Tue, Feb 10, 2015 at 10:11 PM, Baoquan He <bhe@xxxxxxxxxx> 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.
> 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.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/