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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 22.05.17 at 20:01, <boris.ostrovsky@xxxxxxxxxx> wrote:
> 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.

To be honest, a little more detail might help addressing the issue
in a timely manner. I'd suppose you know more than just "breaks"
...

Jan


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