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KVM: Introduce gfn_to_index() which returns the index for a given level

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This patch cleans up the code and removes the "(void)level;" warning
suppressor.

Note that we can also use this for PT_PAGE_TABLE_LEVEL to treat every
level uniformly later.

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Takuya Yoshikawa 2012-02-08 12:59:10 +09:00 • committed by Avi Kivity
commit fb03cb6f44
3 changed files with 9 additions and 8 deletions
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7
include/linux/kvm_host.h
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@ -681,6 +681,13 @@ static inline int memslot_id(struct kvm *kvm, gfn_t gfn)
return gfn_to_memslot(kvm, gfn)->id;
}
static inline gfn_t gfn_to_index(gfn_t gfn, gfn_t base_gfn, int level)
{
/* KVM_HPAGE_GFN_SHIFT(PT_PAGE_TABLE_LEVEL) must be 0. */
return (gfn >> KVM_HPAGE_GFN_SHIFT(level)) -
(base_gfn >> KVM_HPAGE_GFN_SHIFT(level));
}
static inline unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot,
gfn_t gfn)
{