Re: 2.6.25-rc1 xen pvops regression

H. Peter Anvin
2008-02-21T23:32:28Z

Jeremy Fitzhardinge wrote:
>
> It seems to me that those pages are being handed out as heap pages by
> the early allocator. In the Xen case this is OK because there's nothing
> magic about them. But if real hardware doesn't reserve these pages in
> the E820 map, then they could end up being used as regular memory by
> mistake, which is an issue.
>

No, they couldn't.

On real hardware they'll be memory types 0 or 2, depending on whether or
not they're marked reserved.

Available RAM is type 1.

-hpa