Messages in this thread | | | Date | Mon, 07 Feb 2011 11:00:49 -0800 | From | Yinghai Lu <> | Subject | Re: [PATCH] x86/mm/init: respect memblock reserved regions when destroying mappings |
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On 02/07/2011 10:58 AM, Stefano Stabellini wrote: > On Mon, 7 Feb 2011, Yinghai Lu wrote: >> On 02/07/2011 08:50 AM, Stefano Stabellini wrote: >>> On Sun, 6 Feb 2011, Yinghai Lu wrote: >>>> On 02/05/2011 11:30 PM, H. Peter Anvin wrote: >>>>> On 02/05/2011 11:02 PM, Yinghai Lu wrote: >>>>>> why not just move calling cleanup_highmap down? >>>>>> >>>>>> something like attached patch. >>>>> >>>>> This patch looks very clean and looks on the surface of it like it is >>>>> removing some ugly ad hoc code, but (as always) it needs a description >>>>> about the problem it solves and why it is correct. >>>> >>>> Sure. >>>> >>>> >>>> Jeremy and xen guys, can you please check if it works well with xen ? >>>> >>> >>> Actually this patch makes things worse on xen, because before >>> cleanup_highmap() wasn't called at all on xen (on purpose) and now it >>> is, fully destroying all the mappings we have at _end. >>> >>> Can we add a check on memblock reserved regions in cleanup_highmap()? >>> Otherwise could we avoid calling cleanup_highmap() at all on xen? >> >> why DO xen need over-mapped kernel initial mapping? >> >> what is in that range after _end to 512M? > > The mfn list that is the list of machine frame numbers assigned to this > domain; it is used across the kernel to convert pfns into mfns. > It passed to us at that address by the domain builder.
is it possible for you to pass physical address, and then map it in kernel?
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