diff --git a/hw/i386/Makefile.objs b/hw/i386/Makefile.objs
index b34c61c..3ef3b4a 100644
--- a/hw/i386/Makefile.objs
+++ b/hw/i386/Makefile.objs
@@ -11,5 +11,6 @@ obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen-host-pci-device.o
 obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen_pt.o xen_pt_config_init.o xen_pt_msi.o
 obj-y += kvm/
 obj-$(CONFIG_SPICE) += qxl.o qxl-logger.o qxl-render.o
+obj-y += pc-testdev.o
 
 obj-y := $(addprefix ../,$(obj-y))
diff --git a/hw/pc-testdev.c b/hw/pc-testdev.c
new file mode 100644
index 0000000..d326e01
--- /dev/null
+++ b/hw/pc-testdev.c
@@ -0,0 +1,167 @@
+/*
+ * QEMU x86 ISA testdev
+ *
+ * Copyright (c) 2012 Avi Kivity, Gerd Hoffmann, Marcelo Tosatti
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/*
+ * This device is used to test KVM features specific to the x86 port, such
+ * as emulation, power management, interrupt routing, among others. It's meant
+ * to be used like:
+ *
+ * qemu-system-x86_64 -device pc-testdev -serial stdio \
+ * -device isa-debugexit,iobase=0xf4,access-size=2 \
+ * -kernel /home/lmr/Code/virt-test.git/kvm/unittests/msr.flat
+ *
+ * Where msr.flat is one of the KVM unittests, present on a separate repo,
+ * git://git.kernel.org/pub/scm/virt/kvm/kvm-unit-tests.git
+*/
+
+#include <sys/mman.h>
+#include "hw.h"
+#include "qdev.h"
+#include "isa.h"
+#include "exec-memory.h"
+
+typedef struct PCTestdev {
+    ISADevice dev;
+    MemoryRegion iomem;
+    uint32_t ioport_data;
+} PCTestdev;
+
+#define TYPE_TESTDEV "pc-testdev"
+#define TESTDEV(obj) \
+     OBJECT_CHECK(struct PCTestdev, (obj), TYPE_TESTDEV)
+
+static void test_device_irq_line(void *opaque, uint32_t addr, uint32_t data)
+{
+    struct PCTestdev *dev = opaque;
+    qemu_set_irq(isa_get_irq(&dev->dev, addr - 0x2000), !!data);
+}
+
+static void test_device_ioport_write(void *opaque, uint32_t addr, uint32_t data)
+{
+    struct PCTestdev *dev = opaque;
+    dev->ioport_data = data;
+}
+
+static uint32_t test_device_ioport_read(void *opaque, uint32_t addr)
+{
+    struct PCTestdev *dev = opaque;
+    return dev->ioport_data;
+}
+
+static void test_device_flush_page(void *opaque, uint32_t addr, uint32_t data)
+{
+    target_phys_addr_t len = 4096;
+    void *a = cpu_physical_memory_map(data & ~0xffful, &len, 0);
+
+    mprotect(a, 4096, PROT_NONE);
+    mprotect(a, 4096, PROT_READ|PROT_WRITE);
+    cpu_physical_memory_unmap(a, len, 0, 0);
+}
+
+static char *iomem_buf;
+
+static uint32_t test_iomem_readb(void *opaque, target_phys_addr_t addr)
+{
+    return iomem_buf[addr];
+}
+
+static uint32_t test_iomem_readw(void *opaque, target_phys_addr_t addr)
+{
+    return *(uint16_t*)(iomem_buf + addr);
+}
+
+static uint32_t test_iomem_readl(void *opaque, target_phys_addr_t addr)
+{
+    return *(uint32_t*)(iomem_buf + addr);
+}
+
+static void test_iomem_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
+{
+    iomem_buf[addr] = val;
+}
+
+static void test_iomem_writew(void *opaque, target_phys_addr_t addr, uint32_t val)
+{
+    *(uint16_t*)(iomem_buf + addr) = val;
+}
+
+static void test_iomem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
+{
+    *(uint32_t*)(iomem_buf + addr) = val;
+}
+
+static const MemoryRegionOps test_iomem_ops = {
+    .old_mmio = {
+        .read = { test_iomem_readb, test_iomem_readw, test_iomem_readl, },
+        .write = { test_iomem_writeb, test_iomem_writew, test_iomem_writel, },
+    },
+    .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+static const MemoryRegionPortio test_dev_portio_list[] = {
+    { 0xe0, 1, 1, .read = test_device_ioport_read, .write = test_device_ioport_write, },
+    { 0xe0, 1, 2, .read = test_device_ioport_read, .write = test_device_ioport_write, },
+    { 0xe0, 1, 4, .read = test_device_ioport_read, .write = test_device_ioport_write, },
+    { 0xe4, 1, 4, .write = test_device_flush_page, },
+    { 0x2000, 24, 1, .write = test_device_irq_line, },
+    PORTIO_END_OF_LIST(),
+};
+
+static int init_test_device(ISADevice *isa)
+{
+    struct PCTestdev *dev = DO_UPCAST(struct PCTestdev, dev, isa);
+
+    PortioList *test_dev_port_list = g_new(PortioList, 1);
+    portio_list_init(test_dev_port_list, test_dev_portio_list,
+                     NULL, "pc-testdev");
+    portio_list_add(test_dev_port_list, get_system_io(), 0x0);
+
+    iomem_buf = g_malloc0(0x10000);
+    memory_region_init_io(&dev->iomem, &test_iomem_ops, dev,
+                          "pc-testdev", 0x10000);
+    memory_region_add_subregion(isa_address_space(&dev->dev), 0xff000000,
+                                                  &dev->iomem);
+    return 0;
+}
+
+static void testdev_class_init(ObjectClass *klass, void *data)
+{
+    ISADeviceClass *k = ISA_DEVICE_CLASS(klass);
+
+    k->init = init_test_device;
+}
+
+static TypeInfo testdev_info = {
+    .name           = "pc-testdev",
+    .parent         = TYPE_ISA_DEVICE,
+    .instance_size  = sizeof(struct PCTestdev),
+    .class_init     = testdev_class_init,
+};
+
+static void testdev_register_types(void)
+{
+    type_register_static(&testdev_info);
+}
+
+type_init(testdev_register_types)
