KVM: MMU: Initialize a shadow page's global attribute from cr4.pge

If cr4.pge is cleared, we ought to treat any ptes in the page as non-global.
This allows us to remove the check from set_spte().

Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index f15023c..5f03ec3 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -797,7 +797,6 @@ static struct kvm_mmu_page *kvm_mmu_alloc_page(struct kvm_vcpu *vcpu,
        ASSERT(is_empty_shadow_page(sp->spt));
        bitmap_zero(sp->slot_bitmap, KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS);
        sp->multimapped = 0;
-       sp->global = 1;
        sp->parent_pte = parent_pte;
        --vcpu->kvm->arch.n_free_mmu_pages;
        return sp;
@@ -1241,6 +1240,7 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
        pgprintk("%s: adding gfn %lx role %x\n", __func__, gfn, role.word);
        sp->gfn = gfn;
        sp->role = role;
+       sp->global = role.cr4_pge;
        hlist_add_head(&sp->hash_link, bucket);
        if (!metaphysical) {
                if (rmap_write_protect(vcpu->kvm, gfn))
@@ -1668,8 +1668,6 @@ static int set_spte(struct kvm_vcpu *vcpu, u64 *shadow_pte,
        u64 mt_mask = shadow_mt_mask;
        struct kvm_mmu_page *sp = page_header(__pa(shadow_pte));
 
-       if (!(vcpu->arch.cr4 & X86_CR4_PGE))
-               global = 0;
        if (!global && sp->global) {
                sp->global = 0;
                if (sp->unsync) {