ARM64: KVM: MMIO support BE host running LE code

In case of guest CPU running in LE mode and host runs in
BE mode we need byteswap data, so read/write is emulated correctly.

Signed-off-by: Victor Kamensky <[e-mail]>
Reviewed-by: Christoffer Dall <[e-mail]>
Reviewed-by: Marc Zyngier <[e-mail]>
Signed-off-by: Marc Zyngier <[e-mail]>

arch/arm64/include/asm/kvm_emulate.h

···
 		default:
 			return be64_to_cpu(data);
 		}
+	} else {
+		switch (len) {
+		case 1:
+			return data & 0xff;
+		case 2:
+			return le16_to_cpu(data & 0xffff);
+		case 4:
+			return le32_to_cpu(data & 0xffffffff);
+		default:
+			return le64_to_cpu(data);
+		}
 	}
 
 	return data;		/* Leave LE untouched */
···
 			return cpu_to_be32(data & 0xffffffff);
 		default:
 			return cpu_to_be64(data);
+		}
+	} else {
+		switch (len) {
+		case 1:
+			return data & 0xff;
+		case 2:
+			return cpu_to_le16(data & 0xffff);
+		case 4:
+			return cpu_to_le32(data & 0xffffffff);
+		default:
+			return cpu_to_le64(data);
 		}
 	}