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Commit aac01224 authored by Avi Kivity's avatar Avi Kivity
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KVM: MMU: Remove global pte tracking 



The initial, noncaching, version of the kvm mmu flushed the all nonglobal
shadow page table translations (much like a native tlb flush).  The new
implementation flushes translations only when they change, rendering global
pte tracking superfluous.

This removes the unused tracking mechanism and storage space.

Signed-off-by: default avatarAvi Kivity <avi@qumranet.com>
parent ca5aac1f

drivers/kvm/kvm.h

+0 −1
Original line number Diff line number Diff line
@@ -136,7 +136,6 @@ struct kvm_mmu_page { 
	unsigned long slot_bitmap; /* One bit set per slot which has memory

				    * in this shadow page.

				    */

	int global;              /* Set if all ptes in this page are global */

	int multimapped;         /* More than one parent_pte? */

	int root_count;          /* Currently serving as active root */

	union {

drivers/kvm/mmu.c

+0 −9
Original line number Diff line number Diff line
@@ -461,7 +461,6 @@ static struct kvm_mmu_page *kvm_mmu_alloc_page(struct kvm_vcpu *vcpu, 
	list_add(&page->link, &vcpu->kvm->active_mmu_pages);

	ASSERT(is_empty_shadow_page(page->page_hpa));

	page->slot_bitmap = 0;

	page->global = 1;

	page->multimapped = 0;

	page->parent_pte = parent_pte;

	--vcpu->kvm->n_free_mmu_pages;
@@ -927,11 +926,6 @@ static void paging_new_cr3(struct kvm_vcpu *vcpu) 
	kvm_arch_ops->set_cr3(vcpu, vcpu->mmu.root_hpa);

}



static void mark_pagetable_nonglobal(void *shadow_pte)

{

	page_header(__pa(shadow_pte))->global = 0;

}



static inline void set_pte_common(struct kvm_vcpu *vcpu,

			     u64 *shadow_pte,

			     gpa_t gaddr,
@@ -949,9 +943,6 @@ static inline void set_pte_common(struct kvm_vcpu *vcpu, 


	*shadow_pte |= access_bits;



	if (!(*shadow_pte & PT_GLOBAL_MASK))

		mark_pagetable_nonglobal(shadow_pte);



	if (is_error_hpa(paddr)) {

		*shadow_pte |= gaddr;

		*shadow_pte |= PT_SHADOW_IO_MARK;