KVM: MMU: Convert direct maps to use the generic shadow walker

{

}

static int __direct_map(struct kvm_vcpu *vcpu, gpa_t v, int write,

			int largepage, gfn_t gfn, pfn_t pfn)

{

	hpa_t table_addr = vcpu->arch.mmu.root_hpa;

	int pt_write = 0;

	int level = vcpu->arch.mmu.shadow_root_level;

	for (; ; level--) {

		u32 index = PT64_INDEX(v, level);

		u64 *table;

struct direct_shadow_walk {

	struct kvm_shadow_walk walker;

	pfn_t pfn;

	int write;

	int largepage;

	int pt_write;

};

		ASSERT(VALID_PAGE(table_addr));

		table = __va(table_addr);

static int direct_map_entry(struct kvm_shadow_walk *_walk,

			    struct kvm_vcpu *vcpu,

			    gva_t addr, u64 *sptep, int level)

{

	struct direct_shadow_walk *walk =

		container_of(_walk, struct direct_shadow_walk, walker);

	struct kvm_mmu_page *sp;

	gfn_t pseudo_gfn;

	gfn_t gfn = addr >> PAGE_SHIFT;

		if (level == 1 || (largepage && level == 2)) {

			mmu_set_spte(vcpu, &table[index], ACC_ALL, ACC_ALL,

				     0, write, 1, &pt_write, largepage,

				     gfn, pfn, false);

			return pt_write;

	if (level == PT_PAGE_TABLE_LEVEL

	    || (walk->largepage && level == PT_DIRECTORY_LEVEL)) {

		mmu_set_spte(vcpu, sptep, ACC_ALL, ACC_ALL,

			     0, walk->write, 1, &walk->pt_write,

			     walk->largepage, gfn, walk->pfn, false);

		return 1;

	}

		if (table[index] == shadow_trap_nonpresent_pte) {

			struct kvm_mmu_page *new_table;

			gfn_t pseudo_gfn;

			pseudo_gfn = (v & PT64_DIR_BASE_ADDR_MASK)

				>> PAGE_SHIFT;

			new_table = kvm_mmu_get_page(vcpu, pseudo_gfn,

						     v, level - 1,

						     1, ACC_ALL, &table[index]);

			if (!new_table) {

	if (*sptep == shadow_trap_nonpresent_pte) {

		pseudo_gfn = (addr & PT64_DIR_BASE_ADDR_MASK) >> PAGE_SHIFT;

		sp = kvm_mmu_get_page(vcpu, pseudo_gfn, addr, level - 1,

				      1, ACC_ALL, sptep);

		if (!sp) {

			pgprintk("nonpaging_map: ENOMEM\n");

				kvm_release_pfn_clean(pfn);

			kvm_release_pfn_clean(walk->pfn);

			return -ENOMEM;

		}

			set_shadow_pte(&table[index],

				       __pa(new_table->spt)

		set_shadow_pte(sptep,

			       __pa(sp->spt)

			       | PT_PRESENT_MASK | PT_WRITABLE_MASK

			       | shadow_user_mask | shadow_x_mask);

	}

		table_addr = table[index] & PT64_BASE_ADDR_MASK;

	return 0;

}

static int __direct_map(struct kvm_vcpu *vcpu, gpa_t v, int write,

			int largepage, gfn_t gfn, pfn_t pfn)

{

	int r;

	struct direct_shadow_walk walker = {

		.walker = { .entry = direct_map_entry, },

		.pfn = pfn,

		.largepage = largepage,

		.write = write,

		.pt_write = 0,

	};

	r = walk_shadow(&walker.walker, vcpu, (gva_t)gfn << PAGE_SHIFT);

	if (r < 0)

		return r;

	return walker.pt_write;

}

static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, int write, gfn_t gfn)