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: Avi Kivity <avi@qumranet.com>

diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
index 7866b34..a4331da 100644 (file)
--- a/drivers/kvm/kvm.h
+++ b/drivers/kvm/kvm.h
@@ -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 {

diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c
index 4843e95..2930d7c 100644 (file)
--- a/drivers/kvm/mmu.c
+++ b/drivers/kvm/mmu.c
@@ -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;