On 12 October 2018 at 11:00, Cornelia Huck <coh...@redhat.com> wrote:
> From: Tony Krowiak <akrow...@linux.ibm.com>
>
> 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 <akrow...@linux.ibm.com>
> Tested-by: Pierre Morel <pmo...@linux.ibm.com>
> Acked-by: Halil Pasic <pa...@linux.ibm.com>
> Tested-by: Pierre Morel <pmo...@linux.ibm.com>
> Tested-by: Christian Borntraeger <borntrae...@de.ibm.com>
> Message-Id: <20181010170309.12045-6-akrow...@linux.ibm.com>
> Reviewed-by: Thomas Huth <th...@redhat.com>
> [CH: added missing g_free and device category]
> Signed-off-by: Cornelia Huck <coh...@redhat.com>
Hi; Coverity has pointed out a bug in this function
(CID 1396176):
> +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));
ioctl returns -1 and sets errno, so "strerror(ret)" is
the wrong thing here; we want "strerror(errno)".
thanks
-- PMM
