From 9c8e22f530543a2e79e0e80f7d5c696ca50e90a6 Mon Sep 17 00:00:00 2001 From: Xiao Wang Date: Thu, 18 Jun 2015 06:11:48 +0200 Subject: [PATCH 027/217] virtio: device_plugged() can fail Message-id: <1434607916-15166-13-git-send-email-jasowang@redhat.com> Patchwork-id: 66310 O-Subject: [RHEL7.2 qemu-kvm-rhev PATCH 12/20] virtio: device_plugged() can fail Bugzilla: 1231610 RH-Acked-by: Stefan Hajnoczi RH-Acked-by: Vlad Yasevich RH-Acked-by: Michael S. Tsirkin Notes: conflicts since commit 6b8f1020540c27246277377aa2c3331ad2bfb160 ("virtio: move host_features") was not backported. So still need to add Error *parameter to mmio version of device_plugged in RHEL7. This patch passes error pointer to transport specific device_plugged() callback. Through this way, device_plugged() can do some transport specific check and fail. This will be uesd by following patches that check the number of virtqueues against the transport limitation. Cc: Cornelia Huck Cc: Christian Borntraeger Cc: Richard Henderson Cc: Alexander Graf Signed-off-by: Jason Wang Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin (cherry picked from commit e83980455c8c7eb066405de512be7c4bace3ac4d) Signed-off-by: Jason Wang Signed-off-by: Miroslav Rezanina Conflicts: hw/virtio/virtio-bus.c --- hw/s390x/virtio-ccw.c | 2 +- hw/virtio/virtio-bus.c | 5 ++--- hw/virtio/virtio-mmio.c | 2 +- hw/virtio/virtio-pci.c | 2 +- hw/virtio/virtio.c | 7 ++++++- include/hw/virtio/virtio-bus.h | 4 ++-- 6 files changed, 13 insertions(+), 9 deletions(-) diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c index e68dcc7..28d2879 100644 --- a/hw/s390x/virtio-ccw.c +++ b/hw/s390x/virtio-ccw.c @@ -1379,7 +1379,7 @@ static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f) } /* This is called by virtio-bus just after the device is plugged. */ -static void virtio_ccw_device_plugged(DeviceState *d) +static void virtio_ccw_device_plugged(DeviceState *d, Error **errp) { VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); SubchDev *sch = dev->sch; diff --git a/hw/virtio/virtio-bus.c b/hw/virtio/virtio-bus.c index be886e7..24cde3d 100644 --- a/hw/virtio/virtio-bus.c +++ b/hw/virtio/virtio-bus.c @@ -38,7 +38,7 @@ do { printf("virtio_bus: " fmt , ## __VA_ARGS__); } while (0) #endif /* A VirtIODevice is being plugged */ -int virtio_bus_device_plugged(VirtIODevice *vdev) +void virtio_bus_device_plugged(VirtIODevice *vdev, Error **errp) { DeviceState *qdev = DEVICE(vdev); BusState *qbus = BUS(qdev_get_parent_bus(qdev)); @@ -47,10 +47,9 @@ int virtio_bus_device_plugged(VirtIODevice *vdev) DPRINTF("%s: plug device.\n", qbus->name); if (klass->device_plugged != NULL) { - klass->device_plugged(qbus->parent); + klass->device_plugged(qbus->parent, errp); } - return 0; } /* Reset the virtio_bus */ diff --git a/hw/virtio/virtio-mmio.c b/hw/virtio/virtio-mmio.c index 10123f3..dd3f80b 100644 --- a/hw/virtio/virtio-mmio.c +++ b/hw/virtio/virtio-mmio.c @@ -345,7 +345,7 @@ static void virtio_mmio_reset(DeviceState *d) /* virtio-mmio device */ /* This is called by virtio-bus just after the device is plugged. */ -static void virtio_mmio_device_plugged(DeviceState *opaque) +static void virtio_mmio_device_plugged(DeviceState *opaque, Error **errp) { VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque); diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c index b91e799..96d54f1 100644 --- a/hw/virtio/virtio-pci.c +++ b/hw/virtio/virtio-pci.c @@ -918,7 +918,7 @@ static int virtio_pci_query_nvectors(DeviceState *d) } /* This is called by virtio-bus just after the device is plugged. */ -static void virtio_pci_device_plugged(DeviceState *d) +static void virtio_pci_device_plugged(DeviceState *d, Error **errp) { VirtIOPCIProxy *proxy = VIRTIO_PCI(d); VirtioBusState *bus = &proxy->bus; diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index 6985e76..0b50f9d 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -1328,7 +1328,12 @@ static void virtio_device_realize(DeviceState *dev, Error **errp) return; } } - virtio_bus_device_plugged(vdev); + + virtio_bus_device_plugged(vdev, &err); + if (err != NULL) { + error_propagate(errp, err); + return; + } } static void virtio_device_unrealize(DeviceState *dev, Error **errp) diff --git a/include/hw/virtio/virtio-bus.h b/include/hw/virtio/virtio-bus.h index a4588ca..e5bbfbf 100644 --- a/include/hw/virtio/virtio-bus.h +++ b/include/hw/virtio/virtio-bus.h @@ -56,7 +56,7 @@ typedef struct VirtioBusClass { * transport independent init function. * This is called by virtio-bus just after the device is plugged. */ - void (*device_plugged)(DeviceState *d); + void (*device_plugged)(DeviceState *d, Error **errp); /* * transport independent exit function. * This is called by virtio-bus just before the device is unplugged. @@ -75,7 +75,7 @@ struct VirtioBusState { BusState parent_obj; }; -int virtio_bus_device_plugged(VirtIODevice *vdev); +void virtio_bus_device_plugged(VirtIODevice *vdev, Error **errp); void virtio_bus_reset(VirtioBusState *bus); void virtio_bus_device_unplugged(VirtIODevice *bus); /* Get the device id of the plugged device. */ -- 1.8.3.1