static u64 mmu_pte_write_fetch_gpte(struct kvm_vcpu *vcpu, gpa_t *gpa,
				    int *bytes)
{
	u64 gentry = 0;
	int r;

	/*
	 * Assume that the pte write on a page table of the same type
	 * as the current vcpu paging mode since we update the sptes only
	 * when they have the same mode.
	 */
	if (is_pae(vcpu) && *bytes == 4) {
		/* Handle a 32-bit guest writing two halves of a 64-bit gpte */
		*gpa &= ~(gpa_t)7;
		*bytes = 8;
	}

	if (*bytes == 4 || *bytes == 8) {
		r = kvm_vcpu_read_guest_atomic(vcpu, *gpa, &gentry, *bytes);
		if (r)
			gentry = 0;
	}

	return gentry;
}
static u64 mmu_pte_write_fetch_gpte(struct kvm_vcpu *vcpu, gpa_t *gpa,
				    int *bytes)
{
	u64 gentry = 0;
	int r;

	 
	if (is_pae(vcpu) && *bytes == 4) {
		 
		*gpa &= ~(gpa_t)7;
		*bytes = 8;
	}

	if (*bytes == 4 || *bytes == 8) {
		r = kvm_vcpu_read_guest_atomic(vcpu, *gpa, &gentry, *bytes);
		if (r)
			gentry = 0;
	}

	return gentry;
}