diff options
| author | Avi Kivity <avi@qumranet.com> | 2007-01-06 01:36:39 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2007-01-06 08:55:24 +0100 |
| commit | 6bcbd6aba00fced696fc99f1a4fcd7ac7d42d6ef (patch) | |
| tree | 7673a159366ed204a262ef703c6afccf2aeedbc3 /drivers/kvm | |
| parent | [PATCH] KVM: MMU: Implement simple reverse mapping (diff) | |
| download | linux-6bcbd6aba00fced696fc99f1a4fcd7ac7d42d6ef.tar.xz linux-6bcbd6aba00fced696fc99f1a4fcd7ac7d42d6ef.zip | |
[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.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/kvm/paging_tmpl.h b/drivers/kvm/paging_tmpl.h index 8c48528a6e89..3a35c8067dec 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), |