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authorAvi Kivity <avi@qumranet.com>2007-01-05 16:36:39 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2007-01-05 23:55:24 -0800
commit6bcbd6aba00fced696fc99f1a4fcd7ac7d42d6ef (patch)
tree7673a159366ed204a262ef703c6afccf2aeedbc3 /drivers/kvm
parentcd4a4e5374110444dc38831af517e51ff5a053c3 (diff)
[PATCH] KVM: MMU: Teach the page table walker to track guest page table gfns
Saving the table gfns removes the need to walk the guest and host page tables in lockstep. Signed-off-by: Avi Kivity <avi@qumranet.com> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/kvm')
-rw-r--r--drivers/kvm/paging_tmpl.h7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/kvm/paging_tmpl.h b/drivers/kvm/paging_tmpl.h
index 8c48528a6e8..3a35c8067de 100644
--- a/drivers/kvm/paging_tmpl.h
+++ b/drivers/kvm/paging_tmpl.h
@@ -52,6 +52,7 @@
*/
struct guest_walker {
int level;
+ gfn_t table_gfn;
pt_element_t *table;
pt_element_t inherited_ar;
};
@@ -63,8 +64,8 @@ static void FNAME(init_walker)(struct guest_walker *walker,
struct kvm_memory_slot *slot;
walker->level = vcpu->mmu.root_level;
- slot = gfn_to_memslot(vcpu->kvm,
- (vcpu->cr3 & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT);
+ walker->table_gfn = (vcpu->cr3 & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT;
+ slot = gfn_to_memslot(vcpu->kvm, walker->table_gfn);
hpa = safe_gpa_to_hpa(vcpu, vcpu->cr3 & PT64_BASE_ADDR_MASK);
walker->table = kmap_atomic(pfn_to_page(hpa >> PAGE_SHIFT), KM_USER0);
@@ -133,6 +134,8 @@ static pt_element_t *FNAME(fetch_guest)(struct kvm_vcpu *vcpu,
return &walker->table[index];
if (walker->level != 3 || is_long_mode(vcpu))
walker->inherited_ar &= walker->table[index];
+ walker->table_gfn = (walker->table[index] & PT_BASE_ADDR_MASK)
+ >> PAGE_SHIFT;
paddr = safe_gpa_to_hpa(vcpu, walker->table[index] & PT_BASE_ADDR_MASK);
kunmap_atomic(walker->table, KM_USER0);
walker->table = kmap_atomic(pfn_to_page(paddr >> PAGE_SHIFT),