Re: [RFC/PATCH v2 02/10] x86_64: add KASan support

[H. Peter Anvin]

On 09/10/2014 07:31 AM, Andrey Ryabinin wrote:
> This patch add arch specific code for kernel address sanitizer.
> 
> 16TB of virtual addressed used for shadow memory.
> It's located in range [0xffff800000000000 - 0xffff900000000000]
> Therefore PAGE_OFFSET has to be changed from 0xffff880000000000
> to 0xffff900000000000.

NAK on this.

0xffff880000000000 is the lowest usable address because we have agreed
to leave 0xffff800000000000-0xffff880000000000 for the hypervisor or
other non-OS uses.

Bumping PAGE_OFFSET seems needlessly messy, why not just designate a
zone higher up in memory?

	-hpa

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