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authorTony Krowiak <akrowiak@linux.ibm.com>2018-10-10 13:03:07 -0400
committerCornelia Huck <cohuck@redhat.com>2018-10-12 11:32:18 +0200
commit2fe2942cd6ddad8ddd40fe5d16d67599c28959d7 (patch)
tree750c12504804b53cdc571fc847c4678fc68ee603 /hw/vfio/ap.c
parenta51b31535a8ec13997de29b357f7cc1dcd8a7f9c (diff)
s390x/vfio: ap: Introduce VFIO AP device
Introduces a VFIO based AP device. The device is defined via the QEMU command line by specifying: -device vfio-ap,sysfsdev=<path-to-mediated-matrix-device> There may be only one vfio-ap device configured for a guest. The mediated matrix device is created by the VFIO AP device driver by writing a UUID to a sysfs attribute file (see docs/vfio-ap.txt). The mediated matrix device will be named after the UUID. Symbolic links to the $uuid are created in many places, so the path to the mediated matrix device $uuid can be specified in any of the following ways: /sys/devices/vfio_ap/matrix/$uuid /sys/devices/vfio_ap/matrix/mdev_supported_types/vfio_ap-passthrough/devices/$uuid /sys/bus/mdev/devices/$uuid /sys/bus/mdev/drivers/vfio_mdev/$uuid When the vfio-ap device is realized, it acquires and opens the VFIO iommu group to which the mediated matrix device is bound. This causes a VFIO group notification event to be signaled. The vfio_ap device driver's group notification handler will get called at which time the device driver will configure the the AP devices to which the guest will be granted access. Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com> Tested-by: Pierre Morel <pmorel@linux.ibm.com> Acked-by: Halil Pasic <pasic@linux.ibm.com> Tested-by: Pierre Morel <pmorel@linux.ibm.com> Tested-by: Christian Borntraeger <borntraeger@de.ibm.com> Message-Id: <20181010170309.12045-6-akrowiak@linux.ibm.com> Reviewed-by: Thomas Huth <thuth@redhat.com> [CH: added missing g_free and device category] Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Diffstat (limited to 'hw/vfio/ap.c')
-rw-r--r--hw/vfio/ap.c181
1 files changed, 181 insertions, 0 deletions
diff --git a/hw/vfio/ap.c b/hw/vfio/ap.c
new file mode 100644
index 0000000000..3962bb74e5
--- /dev/null
+++ b/hw/vfio/ap.c
@@ -0,0 +1,181 @@
+/*
+ * VFIO based AP matrix device assignment
+ *
+ * Copyright 2018 IBM Corp.
+ * Author(s): Tony Krowiak <akrowiak@linux.ibm.com>
+ * Halil Pasic <pasic@linux.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or (at
+ * your option) any later 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/ap-device.h"
+#include "qemu/error-report.h"
+#include "qemu/queue.h"
+#include "qemu/option.h"
+#include "qemu/config-file.h"
+#include "cpu.h"
+#include "kvm_s390x.h"
+#include "sysemu/sysemu.h"
+#include "hw/s390x/ap-bridge.h"
+#include "exec/address-spaces.h"
+
+#define VFIO_AP_DEVICE_TYPE "vfio-ap"
+
+typedef struct VFIOAPDevice {
+ APDevice apdev;
+ VFIODevice vdev;
+} VFIOAPDevice;
+
+#define VFIO_AP_DEVICE(obj) \
+ OBJECT_CHECK(VFIOAPDevice, (obj), VFIO_AP_DEVICE_TYPE)
+
+static void vfio_ap_compute_needs_reset(VFIODevice *vdev)
+{
+ vdev->needs_reset = false;
+}
+
+/*
+ * We don't need vfio_hot_reset_multi and vfio_eoi operations for
+ * vfio-ap device now.
+ */
+struct VFIODeviceOps vfio_ap_ops = {
+ .vfio_compute_needs_reset = vfio_ap_compute_needs_reset,
+};
+
+static void vfio_ap_put_device(VFIOAPDevice *vapdev)
+{
+ g_free(vapdev->vdev.name);
+ vfio_put_base_device(&vapdev->vdev);
+}
+
+static VFIOGroup *vfio_ap_get_group(VFIOAPDevice *vapdev, Error **errp)
+{
+ GError *gerror = NULL;
+ char *symlink, *group_path;
+ int groupid;
+
+ symlink = g_strdup_printf("%s/iommu_group", vapdev->vdev.sysfsdev);
+ group_path = g_file_read_link(symlink, &gerror);
+ g_free(symlink);
+
+ if (!group_path) {
+ error_setg(errp, "%s: no iommu_group found for %s: %s",
+ VFIO_AP_DEVICE_TYPE, vapdev->vdev.sysfsdev, gerror->message);
+ return NULL;
+ }
+
+ if (sscanf(basename(group_path), "%d", &groupid) != 1) {
+ error_setg(errp, "vfio: failed to read %s", group_path);
+ g_free(group_path);
+ return NULL;
+ }
+
+ g_free(group_path);
+
+ return vfio_get_group(groupid, &address_space_memory, errp);
+}
+
+static void vfio_ap_realize(DeviceState *dev, Error **errp)
+{
+ int ret;
+ char *mdevid;
+ Error *local_err = NULL;
+ VFIOGroup *vfio_group;
+ APDevice *apdev = AP_DEVICE(dev);
+ VFIOAPDevice *vapdev = VFIO_AP_DEVICE(apdev);
+
+ vfio_group = vfio_ap_get_group(vapdev, &local_err);
+ if (!vfio_group) {
+ goto out_err;
+ }
+
+ vapdev->vdev.ops = &vfio_ap_ops;
+ vapdev->vdev.type = VFIO_DEVICE_TYPE_AP;
+ mdevid = basename(vapdev->vdev.sysfsdev);
+ vapdev->vdev.name = g_strdup_printf("%s", mdevid);
+ vapdev->vdev.dev = dev;
+
+ ret = vfio_get_device(vfio_group, mdevid, &vapdev->vdev, &local_err);
+ if (ret) {
+ goto out_get_dev_err;
+ }
+
+ return;
+
+out_get_dev_err:
+ vfio_ap_put_device(vapdev);
+ vfio_put_group(vfio_group);
+out_err:
+ error_propagate(errp, local_err);
+}
+
+static void vfio_ap_unrealize(DeviceState *dev, Error **errp)
+{
+ APDevice *apdev = AP_DEVICE(dev);
+ VFIOAPDevice *vapdev = VFIO_AP_DEVICE(apdev);
+ VFIOGroup *group = vapdev->vdev.group;
+
+ vfio_ap_put_device(vapdev);
+ vfio_put_group(group);
+}
+
+static Property vfio_ap_properties[] = {
+ DEFINE_PROP_STRING("sysfsdev", VFIOAPDevice, vdev.sysfsdev),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void vfio_ap_reset(DeviceState *dev)
+{
+ int ret;
+ APDevice *apdev = AP_DEVICE(dev);
+ VFIOAPDevice *vapdev = VFIO_AP_DEVICE(apdev);
+
+ ret = ioctl(vapdev->vdev.fd, VFIO_DEVICE_RESET);
+ if (ret) {
+ error_report("%s: failed to reset %s device: %s", __func__,
+ vapdev->vdev.name, strerror(ret));
+ }
+}
+
+static const VMStateDescription vfio_ap_vmstate = {
+ .name = VFIO_AP_DEVICE_TYPE,
+ .unmigratable = 1,
+};
+
+static void vfio_ap_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ dc->props = vfio_ap_properties;
+ dc->vmsd = &vfio_ap_vmstate;
+ dc->desc = "VFIO-based AP device assignment";
+ set_bit(DEVICE_CATEGORY_MISC, dc->categories);
+ dc->realize = vfio_ap_realize;
+ dc->unrealize = vfio_ap_unrealize;
+ dc->hotpluggable = false;
+ dc->reset = vfio_ap_reset;
+ dc->bus_type = TYPE_AP_BUS;
+}
+
+static const TypeInfo vfio_ap_info = {
+ .name = VFIO_AP_DEVICE_TYPE,
+ .parent = AP_DEVICE_TYPE,
+ .instance_size = sizeof(VFIOAPDevice),
+ .class_init = vfio_ap_class_init,
+};
+
+static void vfio_ap_type_init(void)
+{
+ type_register_static(&vfio_ap_info);
+}
+
+type_init(vfio_ap_type_init)