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/$uuid
When the vfio-ap device is realized, it acquires and opens the
VFIO iommu group to which the mediated matrix device is
bound. This causes a VFIO group notification event to be
signaled. The vfio_ap device driver's group notification
handler will get called at which time the device driver
will configure the the AP devices to which the guest will
be granted access.
Signed-off-by: Tony Krowiak <address@hidden>
Tested-by: Pierre Morel<address@hidden>
---
MAINTAINERS | 1 +
default-configs/s390x-softmmu.mak | 1 +
hw/vfio/Makefile.objs | 1 +
hw/vfio/ap.c | 180 ++++++++++++++++++++++++++++++
include/hw/vfio/vfio-common.h | 1 +
5 files changed, 184 insertions(+)
create mode 100644 hw/vfio/ap.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 97e8ed808bc0..29041da69237 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1209,6 +1209,7 @@ F: hw/s390x/ap-device.c
F: hw/s390x/ap-bridge.c
F: include/hw/s390x/ap-device.h
F: include/hw/s390x/ap-bridge.h
+F: hw/vfio/ap.c
L: address@hidden
vhost
diff --git a/default-configs/s390x-softmmu.mak
b/default-configs/s390x-softmmu.mak
index d6b67d50f0e4..5eef37592451 100644
--- a/default-configs/s390x-softmmu.mak
+++ b/default-configs/s390x-softmmu.mak
@@ -7,3 +7,4 @@ CONFIG_S390_FLIC=y
CONFIG_S390_FLIC_KVM=$(CONFIG_KVM)
CONFIG_VFIO_CCW=$(CONFIG_LINUX)
CONFIG_WDT_DIAG288=y
+CONFIG_VFIO_AP=$(CONFIG_LINUX)
diff --git a/hw/vfio/Makefile.objs b/hw/vfio/Makefile.objs
index a2e7a0a7cf02..8b3f664d85f7 100644
--- a/hw/vfio/Makefile.objs
+++ b/hw/vfio/Makefile.objs
@@ -6,4 +6,5 @@ obj-$(CONFIG_SOFTMMU) += platform.o
obj-$(CONFIG_VFIO_XGMAC) += calxeda-xgmac.o
obj-$(CONFIG_VFIO_AMD_XGBE) += amd-xgbe.o
obj-$(CONFIG_SOFTMMU) += spapr.o
+obj-$(CONFIG_VFIO_AP) += ap.o
endif
diff --git a/hw/vfio/ap.c b/hw/vfio/ap.c
new file mode 100644
index 000000000000..5543406afc58
--- /dev/null
+++ b/hw/vfio/ap.c
@@ -0,0 +1,180 @@
+/*
+ * VFIO based AP matrix device assignment
+ *
+ * Copyright 2018 IBM Corp.
+ * Author(s): Tony Krowiak <address@hidden>
+ * Halil Pasic <address@hidden>
+ *
+ * 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;
+ char *symlink, *group_path;
+ int groupid;
+
+ symlink = g_strdup_printf("%s/iommu_group", vapdev->vdev.sysfsdev);
+ group_path = g_file_read_link(symlink, &gerror);