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KVM: MMU: Introduce gfn_to_gpa()

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Converting a frame number to an address is tricky since the data type changes
size.  Introduce a function to do it.  This fixes an actual bug when
accessing guest ptes.

Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity 2007-11-21 14:44:45 +02:00
parent 38c335f1f5
commit 1755fbcc66
2 changed files with 6 additions and 2 deletions
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4
drivers/kvm/kvm.h
View File

@ -499,6 +499,10 @@ static inline int memslot_id(struct kvm *kvm, struct kvm_memory_slot *slot)
return slot - kvm->memslots;
}
static inline gpa_t gfn_to_gpa(gfn_t gfn)
{
return (gpa_t)gfn << PAGE_SHIFT;
}
enum kvm_stat_kind {
KVM_STAT_VM,

4
drivers/kvm/paging_tmpl.h
View File

@ -110,7 +110,7 @@ static int FNAME(walk_addr)(struct guest_walker *walker,
index = PT_INDEX(addr, walker->level);
table_gfn = gpte_to_gfn(pte);
pte_gpa = table_gfn << PAGE_SHIFT;
pte_gpa = gfn_to_gpa(table_gfn);
pte_gpa += index * sizeof(pt_element_t);
walker->table_gfn[walker->level - 1] = table_gfn;
pgprintk("%s: table_gfn[%d] %lx\n", __FUNCTION__,
@ -442,7 +442,7 @@ static gpa_t FNAME(gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t vaddr)
r = FNAME(walk_addr)(&walker, vcpu, vaddr, 0, 0, 0);
if (r) {
gpa = (gpa_t)walker.gfn << PAGE_SHIFT;
gpa = gfn_to_gpa(walker.gfn);
gpa |= vaddr & ~PAGE_MASK;
}