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[PATCH] KVM: MMU: Teach the page table walker to track guest page table gfns

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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>
This commit is contained in:
Avi Kivity 2007-01-05 16:36:39 -08:00 committed by Linus Torvalds
parent cd4a4e5374
commit 6bcbd6aba0
1 changed files with 5 additions and 2 deletions
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7
drivers/kvm/paging_tmpl.h
View file

@ -52,6 +52,7 @@
*/ */
struct guest_walker { struct guest_walker {
int level; int level;
gfn_t table_gfn;
pt_element_t *table; pt_element_t *table;
pt_element_t inherited_ar; pt_element_t inherited_ar;
}; };
@ -63,8 +64,8 @@ static void FNAME(init_walker)(struct guest_walker *walker,
struct kvm_memory_slot *slot; struct kvm_memory_slot *slot;
walker->level = vcpu->mmu.root_level; walker->level = vcpu->mmu.root_level;
slot = gfn_to_memslot(vcpu->kvm, walker->table_gfn = (vcpu->cr3 & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT;
(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); hpa = safe_gpa_to_hpa(vcpu, vcpu->cr3 & PT64_BASE_ADDR_MASK);
walker->table = kmap_atomic(pfn_to_page(hpa >> PAGE_SHIFT), KM_USER0); 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]; return &walker->table[index];
if (walker->level != 3 || is_long_mode(vcpu)) if (walker->level != 3 || is_long_mode(vcpu))
walker->inherited_ar &= walker->table[index]; 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); paddr = safe_gpa_to_hpa(vcpu, walker->table[index] & PT_BASE_ADDR_MASK);
kunmap_atomic(walker->table, KM_USER0); kunmap_atomic(walker->table, KM_USER0);
walker->table = kmap_atomic(pfn_to_page(paddr >> PAGE_SHIFT), walker->table = kmap_atomic(pfn_to_page(paddr >> PAGE_SHIFT),