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KVM: Introduce hva_to_gfn_memslot() for kvm_handle_hva()

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This restricts hva handling in mmu code and makes it easier to extend
kvm_handle_hva() so that it can treat a range of addresses later in this
patch series.

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Cc: Alexander Graf <agraf@suse.de>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Takuya Yoshikawa 2012-07-02 17:54:30 +09:00 committed by Marcelo Tosatti
parent 9594a49861
commit d19a748b1c
3 changed files with 12 additions and 5 deletions
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6
arch/powerpc/kvm/book3s_64_mmu_hv.c
View file

@ -772,10 +772,10 @@ static int kvm_handle_hva(struct kvm *kvm, unsigned long hva,
end = start + (memslot->npages << PAGE_SHIFT);
if (hva >= start && hva < end) {
gfn_t gfn_offset = (hva - start) >> PAGE_SHIFT;
gfn_t gfn = hva_to_gfn_memslot(hva, memslot);
gfn_t gfn_offset = gfn - memslot->base_gfn;
ret = handler(kvm, &memslot->rmap[gfn_offset],
memslot->base_gfn + gfn_offset);
ret = handler(kvm, &memslot->rmap[gfn_offset], gfn);
retval |= ret;
}
}

3
arch/x86/kvm/mmu.c
View file

@ -1278,8 +1278,7 @@ static int kvm_handle_hva(struct kvm *kvm, unsigned long hva,
end = start + (memslot->npages << PAGE_SHIFT);
if (hva >= start && hva < end) {
gfn_t gfn_offset = (hva - start) >> PAGE_SHIFT;
gfn_t gfn = memslot->base_gfn + gfn_offset;
gfn_t gfn = hva_to_gfn_memslot(hva, memslot);
ret = 0;

8
include/linux/kvm_host.h
View file

@ -740,6 +740,14 @@ static inline gfn_t gfn_to_index(gfn_t gfn, gfn_t base_gfn, int level)
(base_gfn >> KVM_HPAGE_GFN_SHIFT(level));
}
static inline gfn_t
hva_to_gfn_memslot(unsigned long hva, struct kvm_memory_slot *slot)
{
gfn_t gfn_offset = (hva - slot->userspace_addr) >> PAGE_SHIFT;
return slot->base_gfn + gfn_offset;
}
static inline unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot,
gfn_t gfn)
{