|| ||Joerg Roedel <firstname.lastname@example.org> |
|| ||Avi Kivity <email@example.com>, Marcelo Tosatti <firstname.lastname@example.org> |
|| ||[PATCH 0/27] Nested Paging Virtualization for KVM v3 |
|| ||Mon, 6 Sep 2010 17:01:35 +0200|
|| ||Article, Thread
Hi Avi, Marcelo,
here is finally the third round of my NPT virtualization patches for KVM. It
took a while to get everything running (including KVM itself) on 32 bit again
to actually test it. But testing on 32 bit host and with a 32 bit hypervisor
was a very good idea. I found some serious bugs and shortcomings in my code
that are fixed now in v3.
The patchset was tested in a number of combinations:
Only the valid combinations where tested of course, so no 64 bit on 32 bit
combinations were tested. Except for that I tested all of the above
combinations and all worked without any regressions.
Other changes since v2 are:
* Addressed the review comments from v2:
- Rebased everything to latest upstream code
- renamed nested_mmu to walk_mmu to make its
meaning more clear
- the gva_to_gpa functions are not longer swapped
between the two mmu states which makes it more
- Moved struct vcpu page fault data into seperate
sub-struct for better readability
- Other minor stuff (coding style, typos)
- Renamed the kvm_*_page_x86 functions to kvm_*_page_mmu so
that they can be made more generic later.
* Made everything work on 32 bit
- Introduced mmu->lm_root pointer to let the softmmu shadow 32
bit page tables with a long-mode page table. The lm_root
page-table root always just points to the mmu.pae_root, so
this builds entirely on the pae-shadow code.
- Split mmu_alloc_roots into a shadow and direct_map version to
simplify the code and to not break the direct_map paths anymore
when changing something in that function.
* Probably other changes I forgot about
This patchset applies on todays avi/master + the three patches I sent end of
last week. These patches are necessary for some of the tests above to run.
For the curious and impatient user I put everything in a branch on kernel.org.
If you want to test it you can pull the tree from
Please review and/or apply these patches if considered good enough. Otherwise I
appreciate your feedback.
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