+ if (ret)
+ apic_debug("Local APIC Write to read-only register %x\n", reg);
+ return ret;
+}
+
+static int apic_mmio_write(struct kvm_io_device *this,
+ gpa_t address, int len, const void *data)
+{
+ struct kvm_lapic *apic = to_lapic(this);
+ unsigned int offset = address - apic->base_address;
+ u32 val;
+
+ if (!apic_mmio_in_range(apic, address))
+ return -EOPNOTSUPP;
+
+ /*
+ * APIC register must be aligned on 128-bits boundary.
+ * 32/64/128 bits registers must be accessed thru 32 bits.
+ * Refer SDM 8.4.1
+ */
+ if (len != 4 || (offset & 0xf)) {
+ /* Don't shout loud, $infamous_os would cause only noise. */
+ apic_debug("apic write: bad size=%d %lx\n", len, (long)address);
+ return;
+ }
+
+ val = *(u32*)data;
+
+ /* too common printing */
+ if (offset != APIC_EOI)
+ apic_debug("%s: offset 0x%x with length 0x%x, and value is "
+ "0x%x\n", __func__, offset, len, val);
+
+ apic_reg_write(apic, offset & 0xff0, val);
+