Support Xen versions up to xen-4.1

Hello everybody,

this is version 3 of my patch set. I'm very much indebted to Norbert Trapp for his extensive testing of my previous patch set, which revealed that Xen hypervisor static data was not kept with the previous version of the patch set.

I could also add the performance improvements, but I'm afraid it would make for an incremental patch, so let's wait until the filtering is finally right.

I have re-tested this patch set with the same result as v2:

- Xen-3.2.3 - WORKS
- Xen-4.0.1 - WORKS (only with --xen-syms)
- Xen-4.0.2 - WORKS
- Xen-4.1.2 - WORKS

Filtering free pages (-d16 and above) doesn't work (even after I manually provided the missing "max_pfn" symbol), but that seems unrelated, so I'm going to address it in a subsequent patch set.

Norbert, if you test these patches, please send your comments to the mailing list.

Atsushi-san, if the patch set passes Norbert's testing, what else do you need to accept the changes in upstream?

-----Original Message-----
From: Petr Tesarik [mailto:[email protected]]
Sent: Friday, August 24, 2012 5:46 PM
To: [email protected]
Cc: Trapp, Norbert
Subject: [PATCHv3 0/9] Support Xen versions up to xen-4.1

Hello everybody,

this is version 3 of my patch set. I'm very much indebted to Norbert Trapp for his extensive testing of my previous patch set, which revealed that Xen hypervisor static data was not kept with the previous version of the patch set.

I could also add the performance improvements, but I'm afraid it would make for an incremental patch, so let's wait until the filtering is finally right.

Hello Petr,

Quoted 7 lines

-----Original Message-----
From: Petr Tesarik [mailto:[email protected]]
Sent: Friday, August 24, 2012 5:46 PM
To: [email protected]
Cc: Trapp, Norbert
Subject: [PATCHv3 0/9] Support Xen versions up to xen-4.1

Quoted 6 lines

Hello everybody,

this is version 3 of my patch set. I'm very much indebted to Norbert Trapp for his extensive testing of my previous patch set, which revealed that Xen hypervisor static data was not kept with the previous version of the patch set.

Thank you, Petr. I also admire your patches for all sorts of versions.

Quoted 3 lines

I could also add the performance improvements, but I'm afraid it would make for an incremental patch, so let's wait until the filtering is finally right.

Alright to abandon the performance improvements for the time being but I would vote for adding the 1GB page recognition. That is:
...(pgd_entry & _PAGE_PSE)... in kvto_xen_x86_64. I think you would need a huge amount of memory to recognize this problem.

[...]

Quoted 3 lines

I could also add the performance improvements, but I'm afraid it would make for an incremental patch, so let's wait until the filtering is finally right.

Alright to abandon the performance improvements for the time being but I would vote for adding the 1GB page recognition. That is:
...(pgd_entry & _PAGE_PSE)... in kvto_xen_x86_64. I think you would need a huge amount of memory to recognize this problem.