Re: [Xen-devel] [PATCH v2 for-4.9] x86/mm: Fix incorrect unmapping of 2MB and 1GB pages

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 05/10/2017 07:13 AM, Igor Druzhinin wrote:
> The same set of functions is used to set as well as to clean
> P2M entries, except that for clean operations INVALID_MFN (~0UL)
> is passed as a parameter. Unfortunately, when calculating an
> appropriate target order for a particular mapping INVALID_MFN
> is not taken into account which leads to 4K page target order
> being set each time even for 2MB and 1GB mappings. This eventually
> breaks down an EPT structure irreversibly into 4K mappings which
> prevents consecutive high order mappings to this area.
>
> Signed-off-by: Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>

This patch breaks HVM/PVH on AMD when maxmem > memory.

-boris

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel