D38332.diff
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	diff --git a/usr.sbin/bhyve/qemu_fwcfg.c b/usr.sbin/bhyve/qemu_fwcfg.c
	--- a/usr.sbin/bhyve/qemu_fwcfg.c
	+++ b/usr.sbin/bhyve/qemu_fwcfg.c
	@@ -29,8 +29,33 @@
	#define QEMU_FWCFG_DATA_PORT_FLAGS \
	IOPORT_F_INOUT /* QEMU v2.4+ ignores writes */

	+#define QEMU_FWCFG_ARCHITECTURE_MASK 0x0001
	+#define QEMU_FWCFG_INDEX_MASK 0x3FFF
	+
	+#define QEMU_FWCFG_SELECT_READ 0
	+#define QEMU_FWCFG_SELECT_WRITE 1
	+
	+#define QEMU_FWCFG_ARCHITECTURE_GENERIC 0
	+#define QEMU_FWCFG_ARCHITECTURE_SPECIFIC 1
	+
	+#pragma pack(1)
	+
	+union qemu_fwcfg_selector {
	+ struct {
	+ uint16_t index : 14;
	+ uint16_t writeable : 1;
	+ uint16_t architecture : 1;
	+ };
	+ uint16_t bits;
	+};
	+
	+#pragma pack()
	+
	struct qemu_fwcfg_softc {
	struct acpi_device *acpi_dev;
	+
	+ uint32_t data_offset;
	+ union qemu_fwcfg_selector selector;
	};

	static struct qemu_fwcfg_softc fwcfg_sc;
	@@ -40,6 +65,20 @@
	const int port __unused, const int bytes, uint32_t *const eax,
	void *const arg __unused)
	{
	+ if (bytes != sizeof(uint16_t)) {
	+ warnx("%s: invalid size (%d) of IO port access", __func__,
	+ bytes);
	+ return (-1);
	+ }
	+
	+ if (in) {
	+ *eax = htole16(fwcfg_sc.selector.bits);
	+ return (0);
	+ }
	+
	+ fwcfg_sc.data_offset = 0;
	+ fwcfg_sc.selector.bits = le16toh(*eax);
	+
	return (0);
	}