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KVM: MMU: rename has_wrprotected_page to mmu_gfn_lpage_is_disallowed

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kvm_lpage_info->write_count is used to detect if the large page mapping
for the gfn on the specified level is allowed, rename it to disallow_lpage
to reflect its purpose, also we rename has_wrprotected_page() to
mmu_gfn_lpage_is_disallowed() to make the code more clearer

Later we will extend this mechanism for page tracking: if the gfn is
tracked then large mapping for that gfn on any level is not allowed.
The new name is more straightforward

Reviewed-by: Paolo Bonzini <[email protected]>
Signed-off-by: Xiao Guangrong <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
This commit is contained in:
Xiao Guangrong 2016-02-24 17:51:06 +08:00 • committed by Paolo Bonzini
commit 92f94f1e9e
4 changed files with 25 additions and 22 deletions
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6
Documentation/virtual/kvm/mmu.txt
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@ -391,11 +391,11 @@ To instantiate a large spte, four constraints must be satisfied:
write-protected pages
- the guest page must be wholly contained by a single memory slot
To check the last two conditions, the mmu maintains a ->write_count set of
To check the last two conditions, the mmu maintains a ->disallow_lpage set of
arrays for each memory slot and large page size. Every write protected page
causes its write_count to be incremented, thus preventing instantiation of
causes its disallow_lpage to be incremented, thus preventing instantiation of
a large spte. The frames at the end of an unaligned memory slot have
artificially inflated ->write_counts so they can never be instantiated.
artificially inflated ->disallow_lpages so they can never be instantiated.
Zapping all pages (page generation count)
=========================================