Sukanto Ghosh wrote:
Sukanto Ghosh wrote:
What do these refer to ?
i) kvm_rmap_desc
It's a reverse mapping listing all shadow ptes pointing to a given guest
page.
Then what is the rmap field of the 'struct kvm_memory_slot' ? Is it the
list of kvm_rmap_desc (one list entry for each guest page in that memory
slot) ?
The head of this list.
iii) kvm_mmu_page-> spt ??? ( i thought kvm_mmu_page itself refers to page
of shadow PT, then what does spt points to ? )
kvm_mmu_page contains information about the guest page table and the
host shadow page table. spt is the host shadow page table.
I got more confused now.
I think it is due to terminology. I am novice here and I try to relate
everything to the OS textbooks.
Well, that won't work as I haven't read those textbooks.
I am calling the entire tree-like structure (including the page
directories) as a page table. In the above statement are you referring to
the same ? Or is it the last-level table that holds translated physical
addresses (+ dirty bit, etc ) ?
No, any guest page that is part of the structure. Note the structure is
not a tree, since multiple roots exist and as it may be cyclic.
What about the PGD, PMDs ?
We try not to use Linux specific names while describing guests.
Also, can you explain a line about each of these fields of the
kvm_mmu_page:
i) link (LRU link of what ?)
Yes, the lru link.
ii) gfn (guest frame number of the guest page table ?)
Yes.
iii) parent_pte (in a multi-level page table structure, the PTE in a page
directory that holds the base address of the page table)
Yes (or a list of those pte pointers).
iv) root_count ( comment says 'currently serving as an active root; .is
root = PGD? )
Yes.
--
Do not meddle in the internals of kernels, for they are subtle and quick to
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