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KVM: MMU: Move pte access calculation into a helper function 

Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity 2007-12-09 16:52:56 +02:00
parent 8d87a03aea
commit bedbe4ee86
1 changed files with 13 additions and 7 deletions
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20
drivers/kvm/paging_tmpl.h
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@ -102,6 +102,18 @@ static bool FNAME(cmpxchg_gpte)(struct kvm *kvm,
return (ret != orig_pte);
}
static unsigned FNAME(gpte_access)(struct kvm_vcpu *vcpu, pt_element_t gpte)
{
unsigned access;
access = (gpte & (PT_WRITABLE_MASK | PT_USER_MASK)) | ACC_EXEC_MASK;
#if PTTYPE == 64
if (is_nx(vcpu))
access &= ~(gpte >> PT64_NX_SHIFT);
#endif
return access;
}
/*
* Fetch a guest pte for a guest virtual address
*/
@ -166,13 +178,7 @@ walk:
pte |= PT_ACCESSED_MASK;
}
pte_access = pte & (PT_WRITABLE_MASK | PT_USER_MASK);
pte_access |= ACC_EXEC_MASK;
#if PTTYPE == 64
if (is_nx(vcpu))
pte_access &= ~(pte >> PT64_NX_SHIFT);
#endif
pte_access &= pt_access;
pte_access = pt_access & FNAME(gpte_access)(vcpu, pte);
if (walker->level == PT_PAGE_TABLE_LEVEL) {
walker->gfn = gpte_to_gfn(pte);