We use the No-IOMMU mode of VFIO to realize the ccw device
passthrough, implement a vfio based ccw passthrough
driver called "vfio-ccw".
Support qemu parameters in the style of:
"-device vfio-ccw,id=xx,hostid=xx(,guestid=xx)"
Signed-off-by: Xiao Feng Ren <renxiaof@xxxxxxxxxxxxxxxxxx>
---
default-configs/s390x-softmmu.mak | 1 +
hw/vfio/Makefile.objs | 1 +
hw/vfio/ccw.c | 188 ++++++++++++++++++++++++++++++++++++++
include/hw/vfio/vfio-common.h | 1 +
4 files changed, 191 insertions(+)
create mode 100644 hw/vfio/ccw.c
diff --git a/default-configs/s390x-softmmu.mak b/default-configs/s390x-softmmu.mak
index 36e15de..5576b0a 100644
--- a/default-configs/s390x-softmmu.mak
+++ b/default-configs/s390x-softmmu.mak
@@ -4,4 +4,5 @@ CONFIG_VIRTIO=y
CONFIG_SCLPCONSOLE=y
CONFIG_S390_FLIC=y
CONFIG_S390_FLIC_KVM=$(CONFIG_KVM)
+CONFIG_VFIO_CCW=$(CONFIG_LINUX)
CONFIG_WDT_DIAG288=y
diff --git a/hw/vfio/Makefile.objs b/hw/vfio/Makefile.objs
index ceddbb8..2daf4ae 100644
--- a/hw/vfio/Makefile.objs
+++ b/hw/vfio/Makefile.objs
@@ -1,6 +1,7 @@
ifeq ($(CONFIG_LINUX), y)
obj-$(CONFIG_SOFTMMU) += common.o
obj-$(CONFIG_PCI) += pci.o pci-quirks.o
+obj-$(CONFIG_VFIO_CCW) += ccw.o
obj-$(CONFIG_SOFTMMU) += platform.o
obj-$(CONFIG_SOFTMMU) += calxeda-xgmac.o
obj-$(CONFIG_SOFTMMU) += amd-xgbe.o
diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c
new file mode 100644
index 0000000..501a0e8
--- /dev/null
+++ b/hw/vfio/ccw.c
@@ -0,0 +1,188 @@
+/*
+ * vfio based ccw device assignment support
+ *
+ * Copyright 2016 IBM Corp.
+ * Author(s): Dong Jia Shi <bjsdjshi@xxxxxxxxxxxxxxxxxx>
+ * Xiao Feng Ren <renxiaof@xxxxxxxxxxxxxxxxxx>
+ * Pierre Morel <pmorel@xxxxxxxxxxxxxxxxxx>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or(at
+ * your option) any version. See the COPYING file in the top-level
+ * directory.
+ */
+
+#include <linux/vfio.h>
+#include <sys/ioctl.h>
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "hw/sysbus.h"
+#include "hw/vfio/vfio.h"
+#include "hw/vfio/vfio-common.h"
+#include "hw/s390x/s390-ccw.h"
+
+typedef struct VFIOCCWDevice {
+ S390CCWDevice cdev;
+ VFIODevice vdev;
+} VFIOCCWDevice;
+
+static void vfio_ccw_compute_needs_reset(VFIODevice *vdev)
+{
+ vdev->needs_reset = true;
+}
+
+static int vfio_ccw_hot_reset_multi(VFIODevice *vdev)
+{
+ VFIOCCWDevice *vcdev = container_of(vdev, VFIOCCWDevice, vdev);
+
+ return ioctl(vcdev->vdev.fd, VFIO_DEVICE_CCW_HOT_RESET);
+}
+
+/*
+ * vfio_eoi would be called by vfio_region_read and vfio_region_write
+ * which are not used by us for now.
+ * Let's leave this empty in case we need to realize it later.
+ */
+static void vfio_ccw_eoi(VFIODevice *vdev)
+{
+ /* Do nothing. */
+}
+
+static VFIODeviceOps vfio_ccw_ops = {
+ .vfio_compute_needs_reset = vfio_ccw_compute_needs_reset,
+ .vfio_hot_reset_multi = vfio_ccw_hot_reset_multi,
+ .vfio_eoi = vfio_ccw_eoi,
+};
+
+static void vfio_put_device(VFIOCCWDevice *vcdev)
+{
+ g_free(vcdev->vdev.name);
+ vfio_put_base_device(&vcdev->vdev);
+}
+
+static void vfio_ccw_realize(DeviceState *dev, Error **errp)
+{
+ VFIODevice *vbasedev;
+ VFIOGroup *group;
+ S390CCWDevice *cdev = DO_UPCAST(S390CCWDevice, parent, dev);
+ VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
+ S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
+ char *path = NULL;
+ char *tmp_path = NULL;
+ char *iommu_group_path = NULL;
+ struct stat st;
+ int groupid, ret;
+ GError *gerror;
+
+ /* Call the class init function for ccw device. */
+ if (cdc->realize) {
+ cdc->realize(cdev, errp);
+ if (*errp) {
+ return;
+ }
+ }
+
+ /* Check that host device exists. */
+ path = g_strdup_printf("/sys/bus/ccw/devices/%x.%x.%04x",
+ cdev->hcssid, cdev->hssid, cdev->hdevno);
+ if (stat(path, &st) < 0) {
+ error_setg(errp, "vfio: no such host device %s", path);
+ goto out_err;
+ }
+
+ vcdev->vdev.ops = &vfio_ccw_ops;
+ vcdev->vdev.type = VFIO_DEVICE_TYPE_CCW;
+ vcdev->vdev.name = g_strdup_printf("%02x.%02x.%04x", cdev->hcssid,
+ cdev->hssid, cdev->hdevno);
+
+ tmp_path = g_strconcat(path, "/iommu_group", NULL);
+
+ iommu_group_path = g_file_read_link(tmp_path, &gerror);
+ if (!iommu_group_path) {
+ error_setg(errp, "vfio: error no iommu_group for device");
+ goto out_err;
+ }
+
+ if (sscanf(basename(iommu_group_path), "%d", &groupid) != 1) {
+ error_setg(errp, "vfio: error reading %s:%m", iommu_group_path);
+ goto out_err;
+ }
+
+ group = vfio_get_group(groupid, NULL);
+ if (!group) {
+ error_setg(errp, "vfio: failed to get the group %d", groupid);
+ goto out_err;
+ }
+
+ QLIST_FOREACH(vbasedev, &group->device_list, next) {
+ if (strcmp(vbasedev->name, vcdev->vdev.name) == 0) {
+ error_setg(errp, "vfio: device %s has already been attached",
+ basename(path));
+ vfio_put_group(group);
+ goto out_err;
+ }
+ }
+
+ ret = vfio_get_device(group, basename(path) , &vcdev->vdev);
+ if (ret) {
+ error_setg(errp, "vfio: failed to get device %s", basename(path));
+ vfio_put_group(group);
+ goto out_err;
+ }
+
+out_err:
+ g_free(path);
+ g_free(tmp_path);
+ g_free(iommu_group_path);
+}
+
+static void vfio_ccw_unrealize(DeviceState *dev, Error **errp)
+{
+ S390CCWDevice *cdev = DO_UPCAST(S390CCWDevice, parent, dev);
+ VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
+ S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
+ VFIOGroup *group = vcdev->vdev.group;
+
+ if (cdc->unrealize) {
+ cdc->unrealize(cdev, errp);
+ }
+
+ vfio_put_device(vcdev);
+ vfio_put_group(group);
+}
+
+static Property vfio_ccw_properties[] = {
+ DEFINE_PROP_STRING("hostid", VFIOCCWDevice, cdev.hostid),
+ DEFINE_PROP_STRING("guestid", VFIOCCWDevice, cdev.guestid),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static const VMStateDescription vfio_ccw_vmstate = {
+ .name = "vfio-ccw",
+ .unmigratable = 1,
+};
+
+static void vfio_ccw_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ dc->props = vfio_ccw_properties;
+ dc->vmsd = &vfio_ccw_vmstate;
+ dc->desc = "VFIO-based CCW device assignment";
+ dc->realize = vfio_ccw_realize;
+ dc->unrealize = vfio_ccw_unrealize;
+}
+
+static const TypeInfo vfio_ccw_info = {
+ .name = "vfio-ccw",
+ .parent = TYPE_S390_CCW,
+ .instance_size = sizeof(VFIOCCWDevice),
+ .class_init = vfio_ccw_class_init,
+};
+
+static void register_vfio_ccw_type(void)
+{
+ type_register_static(&vfio_ccw_info);
+}
+
+type_init(register_vfio_ccw_type)
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 85c2a74..b751506 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -41,6 +41,7 @@
enum {
VFIO_DEVICE_TYPE_PCI = 0,
VFIO_DEVICE_TYPE_PLATFORM = 1,
+ VFIO_DEVICE_TYPE_CCW = 2,
};
typedef struct VFIOMmap {
--
2.6.6
--
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