[PATCH v3 4/4] kexec, x86_64: Load bzImage64 above 4G

[Yinghai Lu]

On Wed, Nov 21, 2012 at 11:56 AM, H. Peter Anvin <hpa at zytor.com> wrote:
> On 11/21/2012 11:54 AM, Yinghai Lu wrote:
>>
>> in kernel arch/x86/kernel/head_64.S
>>
>> it only set first 1G ident mapping. and if it find that code is above
>> 1G, it will set extra ident mapping
>> for new _text.._end.
>> To make checking and add extra mapping simple and also save two extra
>> pages for mapping.
>> Limit that _text.._end in them same GB range.
>>
>
> No, this is backwards.

old one: it limited bzImage in [0,1G) aka the first 1G.

Now we can put it in any aligned 1G range.

So how could it be called backwards?

>
> We should fix that limitation instead.

sure, but that will make arch/x86/boot/compressed/head_64.S not need
complicated.