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author | Avi Kivity <avi@qumranet.com> | 2007-01-05 16:36:43 -0800 |
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committer | Linus Torvalds <torvalds@woody.osdl.org> | 2007-01-05 23:55:24 -0800 |
commit | cea0f0e7ea54753c3265dc77f605a6dad1912cfc (patch) | |
tree | e0a3e64b45fe83f1f0ae89556e1f6fcf92f07185 /drivers/kvm/Makefile | |
parent | 25c0de2cc6c26cb99553c2444936a7951c120c09 (diff) |
[PATCH] KVM: MMU: Shadow page table caching
Define a hashtable for caching shadow page tables. Look up the cache on
context switch (cr3 change) or during page faults.
The key to the cache is a combination of
- the guest page table frame number
- the number of paging levels in the guest
* we can cache real mode, 32-bit mode, pae, and long mode page
tables simultaneously. this is useful for smp bootup.
- the guest page table table
* some kernels use a page as both a page table and a page directory. this
allows multiple shadow pages to exist for that page, one per level
- the "quadrant"
* 32-bit mode page tables span 4MB, whereas a shadow page table spans
2MB. similarly, a 32-bit page directory spans 4GB, while a shadow
page directory spans 1GB. the quadrant allows caching up to 4 shadow page
tables for one guest page in one level.
- a "metaphysical" bit
* for real mode, and for pse pages, there is no guest page table, so set
the bit to avoid write protecting the page.
Signed-off-by: Avi Kivity <avi@qumranet.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/kvm/Makefile')
0 files changed, 0 insertions, 0 deletions