hw/misc: Hyper-V test device 'hyperv-testdev'

'hyperv-testdev' will be used by kvm-unit-tests
to setup Hyper-V SynIC SINT's routing and to inject
Hyper-V SynIC SINT's.

Hyper-V test device is ISA type device that creates 0x3000
IO memory region and catches write access into it. Every
write operation data decoded into ctl code and parameters
for Hyper-V test device.

Signed-off-by: Andrey Smetanin <asmetanin@virtuozzo.com>
Reviewed-by: Roman Kagan <rkagan@virtuozzo.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Paolo Bonzini <pbonzini@redhat.com>
CC: Richard Henderson <rth@twiddle.net>
CC: Eduardo Habkost <ehabkost@redhat.com>
CC: "Andreas Färber" <afaerber@suse.de>
CC: Marcelo Tosatti <mtosatti@redhat.com>
CC: Roman Kagan <rkagan@virtuozzo.com>
CC: Denis V. Lunev <den@openvz.org>
CC: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

default-configs/i386-softmmu.mak

@@ -50,3 +50,4 @@ CONFIG_XIO3130=y
 CONFIG_IOH3420=y
 CONFIG_I82801B11=y
 CONFIG_SMBIOS=y
+CONFIG_HYPERV_TESTDEV=$(CONFIG_KVM)

default-configs/x86_64-softmmu.mak

@@ -50,3 +50,4 @@ CONFIG_XIO3130=y
 CONFIG_IOH3420=y
 CONFIG_I82801B11=y
 CONFIG_SMBIOS=y
+CONFIG_HYPERV_TESTDEV=$(CONFIG_KVM)

hw/misc/Makefile.objs

@@ -43,3 +43,4 @@ obj-$(CONFIG_STM32F2XX_SYSCFG) += stm32f2xx_syscfg.o
 
 obj-$(CONFIG_PVPANIC) += pvpanic.o
 obj-$(CONFIG_EDU) += edu.o
+obj-$(CONFIG_HYPERV_TESTDEV) += hyperv_testdev.o

hw/misc/hyperv_testdev.c

@@ -0,0 +1,167 @@
+/*
+ * QEMU KVM Hyper-V test device to support Hyper-V kvm-unit-tests
+ *
+ * Copyright (C) 2015 Andrey Smetanin <asmetanin@virtuozzo.com>
+ *
+ * Authors:
+ *  Andrey Smetanin <asmetanin@virtuozzo.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "hw/hw.h"
+#include "hw/qdev.h"
+#include "hw/isa/isa.h"
+#include "sysemu/kvm.h"
+#include "linux/kvm.h"
+#include "target-i386/hyperv.h"
+#include "kvm_i386.h"
+
+#define HV_TEST_DEV_MAX_SINT_ROUTES 64
+
+struct HypervTestDev {
+    ISADevice parent_obj;
+    MemoryRegion sint_control;
+    HvSintRoute *sint_route[HV_TEST_DEV_MAX_SINT_ROUTES];
+};
+typedef struct HypervTestDev HypervTestDev;
+
+#define TYPE_HYPERV_TEST_DEV "hyperv-testdev"
+#define HYPERV_TEST_DEV(obj) \
+        OBJECT_CHECK(HypervTestDev, (obj), TYPE_HYPERV_TEST_DEV)
+
+enum {
+    HV_TEST_DEV_SINT_ROUTE_CREATE = 1,
+    HV_TEST_DEV_SINT_ROUTE_DESTROY,
+    HV_TEST_DEV_SINT_ROUTE_SET_SINT
+};
+
+static int alloc_sint_route_index(HypervTestDev *dev)
+{
+    int i;
+
+    for (i = 0; i < ARRAY_SIZE(dev->sint_route); i++) {
+        if (dev->sint_route[i] == NULL) {
+            return i;
+        }
+    }
+    return -1;
+}
+
+static void free_sint_route_index(HypervTestDev *dev, int i)
+{
+    assert(i >= 0 && i < ARRAY_SIZE(dev->sint_route));
+    dev->sint_route[i] = NULL;
+}
+
+static int find_sint_route_index(HypervTestDev *dev, uint32_t vcpu_id,
+                                 uint32_t sint)
+{
+    HvSintRoute *sint_route;
+    int i;
+
+    for (i = 0; i < ARRAY_SIZE(dev->sint_route); i++) {
+        sint_route = dev->sint_route[i];
+        if (sint_route && sint_route->vcpu_id == vcpu_id &&
+            sint_route->sint == sint) {
+            return i;
+        }
+    }
+    return -1;
+}
+
+static void hv_synic_test_dev_control(HypervTestDev *dev, uint32_t ctl,
+                                      uint32_t vcpu_id, uint32_t sint)
+{
+    int i;
+    HvSintRoute *sint_route;
+
+    switch (ctl) {
+    case HV_TEST_DEV_SINT_ROUTE_CREATE:
+        i = alloc_sint_route_index(dev);
+        assert(i >= 0);
+        sint_route = kvm_hv_sint_route_create(vcpu_id, sint, NULL);
+        assert(sint_route);
+        dev->sint_route[i] = sint_route;
+        break;
+    case HV_TEST_DEV_SINT_ROUTE_DESTROY:
+        i = find_sint_route_index(dev, vcpu_id, sint);
+        assert(i >= 0);
+        sint_route = dev->sint_route[i];
+        kvm_hv_sint_route_destroy(sint_route);
+        free_sint_route_index(dev, i);
+        break;
+    case HV_TEST_DEV_SINT_ROUTE_SET_SINT:
+        i = find_sint_route_index(dev, vcpu_id, sint);
+        assert(i >= 0);
+        sint_route = dev->sint_route[i];
+        kvm_hv_sint_route_set_sint(sint_route);
+        break;
+    default:
+        break;
+    }
+}
+
+static void hv_test_dev_control(void *opaque, hwaddr addr, uint64_t data,
+                                uint32_t len)
+{
+    HypervTestDev *dev = HYPERV_TEST_DEV(opaque);
+    uint8_t ctl;
+
+    ctl = (data >> 16ULL) & 0xFF;
+    switch (ctl) {
+    case HV_TEST_DEV_SINT_ROUTE_CREATE:
+    case HV_TEST_DEV_SINT_ROUTE_DESTROY:
+    case HV_TEST_DEV_SINT_ROUTE_SET_SINT: {
+        uint8_t sint = data & 0xFF;
+        uint8_t vcpu_id = (data >> 8ULL) & 0xFF;
+        hv_synic_test_dev_control(dev, ctl, vcpu_id, sint);
+        break;
+    }
+    default:
+        break;
+    }
+}
+
+static const MemoryRegionOps synic_test_sint_ops = {
+    .write = hv_test_dev_control,
+    .valid.min_access_size = 4,
+    .valid.max_access_size = 4,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+static void hv_test_dev_realizefn(DeviceState *d, Error **errp)
+{
+    ISADevice *isa = ISA_DEVICE(d);
+    HypervTestDev *dev = HYPERV_TEST_DEV(d);
+    MemoryRegion *io = isa_address_space_io(isa);
+
+    memset(dev->sint_route, 0, sizeof(dev->sint_route));
+    memory_region_init_io(&dev->sint_control, OBJECT(dev),
+                          &synic_test_sint_ops, dev,
+                          "hyperv-testdev-ctl", 4);
+    memory_region_add_subregion(io, 0x3000, &dev->sint_control);
+}
+
+static void hv_test_dev_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
+    dc->realize = hv_test_dev_realizefn;
+}
+
+static const TypeInfo hv_test_dev_info = {
+    .name           = TYPE_HYPERV_TEST_DEV,
+    .parent         = TYPE_ISA_DEVICE,
+    .instance_size  = sizeof(HypervTestDev),
+    .class_init     = hv_test_dev_class_init,
+};
+
+static void hv_test_dev_register_types(void)
+{
+    type_register_static(&hv_test_dev_info);
+}
+type_init(hv_test_dev_register_types);