Re: [PATCH] x86-64: disable the GART before allocate aperture

Yinghai Lu
2007-06-22T21:59:28Z

On 6/22/07, Eric W. Biederman <ebiederm@xmission.com> wrote:
> Alan Cox <alan@lxorguk.ukuu.org.uk> writes:
>
> For a normal kexec we should shut everything down before the kernel
> transition so it should not be an issue.
>
> YH do you think you can look at simply reserving a portion of the iommu?
> And having the kexec on panic kernel use the reserved portion?
>
two copy region: one for first kernel, and one for second kernel? it
should work.
first kernel is using [64M, 128M), and the second will get assign to
[64M,128M) again.
when it try to memset to clear that region it will cause restart.
in that region, only first 256K can not touched, even read. rest could
be accessed.

YH