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Re: [Xen-devel] xen: memory initialization/balloon fixes (#2)

On Fri, Aug 19, 2011 at 03:57:15PM +0100, David Vrabel wrote:
> This set of patches fixes some bugs in the memory initialization under
> Xen and in Xen's memory balloon driver.  They can make 100s of MB of
> additional RAM available (depending on the system/configuration).
Ah, please ignore my previous ping email. Seems that my mail server
was a bit stuffed.

> Patches 1 & 2 are fixes and should be queued for 3.1 and possibly
> queued for the 3.0 stable tree.

> Patches 3 & 4 increase the amount of low memory in 32 bit domains
> started with < 1 GiB of RAM.  Please queue for 3.2

K, let me look at them this week.
> Patch 5 releases all pages in the initial allocation with PFNs that
> lie within a 1-1 mapping.  This seems correct to me as I think that
> once the 1-1 mapping is set the MFN of the original page is lost so
> it's no longer accessible by the kernel (and it cannot be used by
> another domain as the Xen still thinks its used by the original
> domain).
> Changes since #1
> - Reordered patches to put "xen: use maximum reservation to limit
>   amount of usable RAM" first.
> - Check maximum reservation for domU as well.
> - New patch "xen/balloon: account for pages released during memory
>   setup"
> - Added explicit check of size when adding regions in the balloon
>   driver.
> - New patch "xen: release all pages within 1-1 p2m mappings"
> David
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