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authorAvi Kivity <avi@qumranet.com>2007-12-09 16:52:56 +0200
committerAvi Kivity <avi@qumranet.com>2008-01-30 17:53:20 +0200
commitbedbe4ee86195dcd899577828714cc1413beb571 (patch)
tree3dfd5ae82837d4dacdabd8efd8a498cb5c4bcb9b /drivers
parent8d87a03aea43535a92efbb180e0ceac94d4bb5db (diff)
KVM: MMU: Move pte access calculation into a helper function
Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/kvm/paging_tmpl.h20
1 files changed, 13 insertions, 7 deletions
diff --git a/drivers/kvm/paging_tmpl.h b/drivers/kvm/paging_tmpl.h
index 59ba752a688..1fc4f9b321e 100644
--- a/drivers/kvm/paging_tmpl.h
+++ b/drivers/kvm/paging_tmpl.h
@@ -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);