[RFC,v4,3/6] qmp: decode feature bits in virtio-status

Message ID	20200507134800.10837-4-lvivier@redhat.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <SRS0=puwx=6V=nongnu.org=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@kernel.org> DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F1E6F2073A From: Laurent Vivier <lvivier@redhat.com> To: lvivier@redhat.com, qemu-devel@nongnu.org Subject: [RFC v4 3/6] qmp: decode feature bits in virtio-status Date: Thu, 7 May 2020 15:47:57 +0200 Message-Id: <20200507134800.10837-4-lvivier@redhat.com> In-Reply-To: <20200507134800.10837-1-lvivier@redhat.com> References: <20200507134800.10837-1-lvivier@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable Received-SPF: pass client-ip=205.139.110.61; envelope-from=lvivier@redhat.com; helo=us-smtp-delivery-1.mimecast.com Precedence: list Cc: Kevin Wolf <kwolf@redhat.com>, Fam Zheng <fam@euphon.net>, Thomas Huth <thuth@redhat.com>, Michael Roth <mdroth@linux.vnet.ibm.com>, qemu-block@nongnu.org, Amit Shah <amit@kernel.org>, Jason Wang <jasowang@redhat.com>, "Michael S. Tsirkin" <mst@redhat.com>, David Hildenbrand <david@redhat.com>, Markus Armbruster <armbru@redhat.com>, "Dr. David Alan Gilbert" <dgilbert@redhat.com>, Eric Auger <eric.auger@redhat.com>, Gerd Hoffmann <kraxel@redhat.com>, Stefan Hajnoczi <stefanha@redhat.com>, =?utf-8?q?Marc-Andr=C3=A9_Lureau?= <marcandre.lureau@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, Max Reitz <mreitz@redhat.com> Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" <qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org>
Series	hmp,qmp: Add some commands to introspect virtio devices \| expand [RFC,v4,0/6] hmp,qmp: Add some commands to introspect virtio devices [RFC,v4,1/6] qmp: add QMP command x-debug-query-virtio [RFC,v4,2/6] qmp: add QMP command x-debug-virtio-status [RFC,v4,3/6] qmp: decode feature bits in virtio-status [RFC,v4,4/6] qmp: add QMP command x-debug-virtio-queue-status [RFC,v4,5/6] qmp: add QMP command x-debug-virtio-queue-element [RFC,v4,6/6] hmp: add x-debug-virtio commands

diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c index 97ba8a218727..5bb3f70cbd1b 100644 --- a/hw/block/virtio-blk.c +++ b/hw/block/virtio-blk.c @@ -13,6 +13,7 @@ #include "qemu/osdep.h" #include "qapi/error.h" +#include "qapi/qapi-visit-virtio.h" #include "qemu/iov.h" #include "qemu/module.h" #include "qemu/error-report.h" @@ -48,6 +49,28 @@ static VirtIOFeature feature_sizes[] = { {} }; +qmp_virtio_feature_map_t blk_map[] = { +#define FEATURE_ENTRY(name) \ + { VIRTIO_BLK_F_##name, VIRTIO_BLK_FEATURE_##name } + FEATURE_ENTRY(SIZE_MAX), + FEATURE_ENTRY(SEG_MAX), + FEATURE_ENTRY(GEOMETRY), + FEATURE_ENTRY(RO), + FEATURE_ENTRY(BLK_SIZE), + FEATURE_ENTRY(TOPOLOGY), + FEATURE_ENTRY(MQ), + FEATURE_ENTRY(DISCARD), + FEATURE_ENTRY(WRITE_ZEROES), +#ifndef VIRTIO_BLK_NO_LEGACY + FEATURE_ENTRY(BARRIER), + FEATURE_ENTRY(SCSI), + FEATURE_ENTRY(FLUSH), + FEATURE_ENTRY(CONFIG_WCE), +#endif +#undef FEATURE_ENTRY + { -1, -1 } +}; + static void virtio_blk_set_config_size(VirtIOBlock *s, uint64_t host_features) { s->config_size = MAX(VIRTIO_BLK_CFG_SIZE, diff --git a/hw/char/virtio-serial-bus.c b/hw/char/virtio-serial-bus.c index 99a65bab7fff..872ba2ccf49f 100644 --- a/hw/char/virtio-serial-bus.c +++ b/hw/char/virtio-serial-bus.c @@ -20,6 +20,7 @@ #include "qemu/osdep.h" #include "qapi/error.h" +#include "qapi/qapi-visit-virtio.h" #include "qemu/iov.h" #include "qemu/main-loop.h" #include "qemu/module.h" @@ -33,6 +34,16 @@ #include "hw/virtio/virtio-serial.h" #include "hw/virtio/virtio-access.h" +qmp_virtio_feature_map_t serial_map[] = { +#define FEATURE_ENTRY(name) \ + { VIRTIO_CONSOLE_F_##name, VIRTIO_SERIAL_FEATURE_##name } + FEATURE_ENTRY(SIZE), + FEATURE_ENTRY(MULTIPORT), + FEATURE_ENTRY(EMERG_WRITE), +#undef FEATURE_ENTRY + { -1, -1 } +}; + static struct VirtIOSerialDevices { QLIST_HEAD(, VirtIOSerial) devices; } vserdevices; diff --git a/hw/display/virtio-gpu-base.c b/hw/display/virtio-gpu-base.c index 55e07995feec..da66325452df 100644 --- a/hw/display/virtio-gpu-base.c +++ b/hw/display/virtio-gpu-base.c @@ -16,9 +16,19 @@ #include "hw/virtio/virtio-gpu.h" #include "migration/blocker.h" #include "qapi/error.h" +#include "qapi/qapi-visit-virtio.h" #include "qemu/error-report.h" #include "trace.h" +qmp_virtio_feature_map_t gpu_map[] = { +#define FEATURE_ENTRY(name) \ + { VIRTIO_GPU_F_##name, VIRTIO_GPU_FEATURE_##name } + FEATURE_ENTRY(VIRGL), + FEATURE_ENTRY(EDID), +#undef FEATURE_ENTRY + { -1, -1 } +}; + void virtio_gpu_base_reset(VirtIOGPUBase *g) { diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c index 3301869d4f90..e4e4e8df32a4 100644 --- a/hw/net/virtio-net.c +++ b/hw/net/virtio-net.c @@ -35,6 +35,7 @@ #include "hw/qdev-properties.h" #include "qapi/qapi-types-migration.h" #include "qapi/qapi-events-migration.h" +#include "qapi/qapi-visit-virtio.h" #include "hw/virtio/virtio-access.h" #include "migration/misc.h" #include "standard-headers/linux/ethtool.h" @@ -85,6 +86,40 @@ #endif +qmp_virtio_feature_map_t net_map[] = { +#define FEATURE_ENTRY(name) \ + { VIRTIO_NET_F_##name, VIRTIO_NET_FEATURE_##name } + FEATURE_ENTRY(CSUM), + FEATURE_ENTRY(GUEST_CSUM), + FEATURE_ENTRY(CTRL_GUEST_OFFLOADS), + FEATURE_ENTRY(MTU), + FEATURE_ENTRY(MAC), + FEATURE_ENTRY(GUEST_TSO4), + FEATURE_ENTRY(GUEST_TSO6), + FEATURE_ENTRY(GUEST_ECN), + FEATURE_ENTRY(GUEST_UFO), + FEATURE_ENTRY(HOST_TSO4), + FEATURE_ENTRY(HOST_TSO6), + FEATURE_ENTRY(HOST_ECN), + FEATURE_ENTRY(HOST_UFO), + FEATURE_ENTRY(MRG_RXBUF), + FEATURE_ENTRY(STATUS), + FEATURE_ENTRY(CTRL_VQ), + FEATURE_ENTRY(CTRL_RX), + FEATURE_ENTRY(CTRL_VLAN), + FEATURE_ENTRY(CTRL_RX_EXTRA), + FEATURE_ENTRY(GUEST_ANNOUNCE), + FEATURE_ENTRY(MQ), + FEATURE_ENTRY(CTRL_MAC_ADDR), + FEATURE_ENTRY(STANDBY), + FEATURE_ENTRY(SPEED_DUPLEX), +#ifndef VIRTIO_NET_NO_LEGACY + FEATURE_ENTRY(GSO), +#endif /* VIRTIO_NET_NO_LEGACY */ +#undef FEATURE_ENTRY + { -1, -1 } +}; + static inline __virtio16 *virtio_net_rsc_ext_num_packets( struct virtio_net_hdr *hdr) { diff --git a/hw/scsi/virtio-scsi.c b/hw/scsi/virtio-scsi.c index 472bbd233bf3..7f027fbacf56 100644 --- a/hw/scsi/virtio-scsi.c +++ b/hw/scsi/virtio-scsi.c @@ -15,6 +15,7 @@ #include "qemu/osdep.h" #include "qapi/error.h" +#include "qapi/qapi-visit-virtio.h" #include "standard-headers/linux/virtio_ids.h" #include "hw/virtio/virtio-scsi.h" #include "migration/qemu-file-types.h" @@ -28,6 +29,17 @@ #include "hw/virtio/virtio-bus.h" #include "hw/virtio/virtio-access.h" +qmp_virtio_feature_map_t scsi_map[] = { +#define FEATURE_ENTRY(name) \ + { VIRTIO_SCSI_F_##name, VIRTIO_SCSI_FEATURE_##name } + FEATURE_ENTRY(INOUT), + FEATURE_ENTRY(HOTPLUG), + FEATURE_ENTRY(CHANGE), + FEATURE_ENTRY(T10_PI), +#undef FEATURE_ENTRY + { -1, -1 } +}; + static inline int virtio_scsi_get_lun(uint8_t *lun) { return ((lun[2] << 8) | lun[3]) & 0x3FFF; diff --git a/hw/virtio/virtio-balloon.c b/hw/virtio/virtio-balloon.c index a4729f7fc930..3cd9b319e77a 100644 --- a/hw/virtio/virtio-balloon.c +++ b/hw/virtio/virtio-balloon.c @@ -26,6 +26,7 @@ #include "qapi/error.h" #include "qapi/qapi-events-misc.h" #include "qapi/visitor.h" +#include "qapi/qapi-visit-virtio.h" #include "trace.h" #include "qemu/error-report.h" #include "migration/misc.h" @@ -33,6 +34,18 @@ #include "hw/virtio/virtio-bus.h" #include "hw/virtio/virtio-access.h" +qmp_virtio_feature_map_t balloon_map[] = { +#define FEATURE_ENTRY(name) \ + { VIRTIO_BALLOON_F_##name, VIRTIO_BALLOON_FEATURE_##name } + FEATURE_ENTRY(MUST_TELL_HOST), + FEATURE_ENTRY(STATS_VQ), + FEATURE_ENTRY(DEFLATE_ON_OOM), + FEATURE_ENTRY(FREE_PAGE_HINT), + FEATURE_ENTRY(PAGE_POISON), +#undef FEATURE_ENTRY + { -1, -1 } +}; + #define BALLOON_PAGE_SIZE (1 << VIRTIO_BALLOON_PFN_SHIFT) typedef struct PartiallyBalloonedPage { diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c index 22ba8848c2fe..89858321ef87 100644 --- a/hw/virtio/virtio-iommu.c +++ b/hw/virtio/virtio-iommu.c @@ -25,6 +25,7 @@ #include "hw/virtio/virtio.h" #include "sysemu/kvm.h" #include "qapi/error.h" +#include "qapi/qapi-visit-virtio.h" #include "qemu/error-report.h" #include "trace.h" @@ -36,6 +37,19 @@ #include "hw/pci/pci_bus.h" #include "hw/pci/pci.h" +qmp_virtio_feature_map_t iommu_map[] = { +#define FEATURE_ENTRY(name) \ + { VIRTIO_IOMMU_F_##name, VIRTIO_IOMMU_FEATURE_##name } + FEATURE_ENTRY(INPUT_RANGE), + FEATURE_ENTRY(DOMAIN_RANGE), + FEATURE_ENTRY(MAP_UNMAP), + FEATURE_ENTRY(BYPASS), + FEATURE_ENTRY(PROBE), + FEATURE_ENTRY(MMIO), +#undef FEATURE_ENTRY + { -1, -1 } +}; + /* Max size */ #define VIOMMU_DEFAULT_QUEUE_SIZE 256 diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index af69e874258d..59bf6ef651a6 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -29,9 +29,30 @@ #include "hw/virtio/virtio-access.h" #include "sysemu/dma.h" #include "sysemu/runstate.h" +#include "config-devices.h" static QTAILQ_HEAD(, VirtIODevice) virtio_list; +static qmp_virtio_feature_map_t transport_map[] = { +#define FEATURE_ENTRY(name) \ + { VIRTIO_F_##name, VIRTIO_TRANSPORT_FEATURE_##name } + FEATURE_ENTRY(NOTIFY_ON_EMPTY), + FEATURE_ENTRY(ANY_LAYOUT), + FEATURE_ENTRY(VERSION_1), + FEATURE_ENTRY(IOMMU_PLATFORM), + FEATURE_ENTRY(RING_PACKED), + FEATURE_ENTRY(ORDER_PLATFORM), + FEATURE_ENTRY(SR_IOV), + FEATURE_ENTRY(BAD_FEATURE), +#undef FEATURE_ENTRY +#define FEATURE_ENTRY(name) \ + { VIRTIO_RING_F_##name, VIRTIO_TRANSPORT_FEATURE_##name } + FEATURE_ENTRY(INDIRECT_DESC), + FEATURE_ENTRY(EVENT_IDX), +#undef FEATURE_ENTRY + { -1, -1 } +}; + /* * The alignment to use between consumer and producer parts of vring. * x86 pagesize again. This is the default, used by transports like PCI @@ -3856,6 +3877,90 @@ static VirtIODevice *virtio_device_find(const char *path) return NULL; } +#define CONVERT_FEATURES(type, map) \ + ({ \ + type *list = NULL; \ + type *node; \ + for (i = 0; map[i].virtio_bit != -1; i++) {\ + bit = 1ULL << map[i].virtio_bit; \ + if ((bitmap & bit) == 0) { \ + continue; \ + } \ + node = g_new0(type, 1); \ + node->value = map[i].qapi_virtio_enum; \ + node->next = list; \ + list = node; \ + bitmap ^= bit; \ + } \ + list; \ + }) + +static VirtioStatusFeatures *qmp_decode_features(const char *name, + uint64_t bitmap) +{ + VirtioStatusFeatures *features; + uint64_t bit; + int i; + + features = g_new0(VirtioStatusFeatures, 1); + + /* transport features */ + features->transport = CONVERT_FEATURES(VirtioTransportFeatureList, \ + transport_map); + + /* device features */ + features->device = g_new0(VirtioDeviceFeatures, 1); + features->device->type = qapi_enum_parse(&VirtioDeviceFeaturesKind_lookup, + name, -1, NULL); + switch (features->device->type) { + case VIRTIO_DEVICE_FEATURES_KIND_VIRTIO_SERIAL: + features->device->u.virtio_serial.data = + CONVERT_FEATURES(VirtioSerialFeatureList, serial_map); + break; +#ifdef CONFIG_VIRTIO_BLK + case VIRTIO_DEVICE_FEATURES_KIND_VIRTIO_BLK: + features->device->u.virtio_blk.data = + CONVERT_FEATURES(VirtioBlkFeatureList, blk_map); + break; +#endif +#ifdef CONFIG_VIRTIO_GPU + case VIRTIO_DEVICE_FEATURES_KIND_VIRTIO_GPU: + features->device->u.virtio_gpu.data = + CONVERT_FEATURES(VirtioGpuFeatureList, gpu_map); + break; +#endif +#ifdef CONFIG_VIRTIO_NET + case VIRTIO_DEVICE_FEATURES_KIND_VIRTIO_NET: + features->device->u.virtio_net.data = + CONVERT_FEATURES(VirtioNetFeatureList, net_map); + break; +#endif +#ifdef CONFIG_VIRTIO_SCSI + case VIRTIO_DEVICE_FEATURES_KIND_VIRTIO_SCSI: + features->device->u.virtio_scsi.data = + CONVERT_FEATURES(VirtioScsiFeatureList, scsi_map); + break; +#endif +#ifdef CONFIG_VIRTIO_BALLOON + case VIRTIO_DEVICE_FEATURES_KIND_VIRTIO_BALLOON: + features->device->u.virtio_balloon.data = + CONVERT_FEATURES(VirtioBalloonFeatureList, balloon_map); + break; +#endif +#ifdef CONFIG_VIRTIO_IOMMU + case VIRTIO_DEVICE_FEATURES_KIND_VIRTIO_IOMMU: + features->device->u.virtio_iommu.data = + CONVERT_FEATURES(VirtioIommuFeatureList, iommu_map); + break; +#endif + default: + g_assert_not_reached(); + } + features->unknown = bitmap; + + return features; +} + VirtioStatus *qmp_x_debug_virtio_status(const char* path, Error **errp) { VirtIODevice *vdev; @@ -3868,9 +3973,12 @@ VirtioStatus *qmp_x_debug_virtio_status(const char* path, Error **errp) } status = g_new0(VirtioStatus, 1); - status->guest_features = vdev->guest_features; - status->host_features = vdev->host_features; - status->backend_features = vdev->backend_features; + status->guest_features = qmp_decode_features(vdev->name, + vdev->guest_features); + status->host_features = qmp_decode_features(vdev->name, + vdev->host_features); + status->backend_features = qmp_decode_features(vdev->name, + vdev->backend_features); status->device_id = vdev->device_id; switch (vdev->device_endian) { diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h index 65adce680188..f10c3365e367 100644 --- a/include/hw/virtio/virtio.h +++ b/include/hw/virtio/virtio.h @@ -166,6 +166,19 @@ typedef struct VirtioDeviceClass { bool (*primary_unplug_pending)(void *opaque); } VirtioDeviceClass; +typedef struct { + int virtio_bit; + int qapi_virtio_enum; +} qmp_virtio_feature_map_t; + +extern qmp_virtio_feature_map_t serial_map[]; +extern qmp_virtio_feature_map_t blk_map[]; +extern qmp_virtio_feature_map_t gpu_map[]; +extern qmp_virtio_feature_map_t net_map[]; +extern qmp_virtio_feature_map_t scsi_map[]; +extern qmp_virtio_feature_map_t balloon_map[]; +extern qmp_virtio_feature_map_t iommu_map[]; + void virtio_instance_init_common(Object *proxy_obj, void *data, size_t vdev_size, const char *vdev_name); diff --git a/qapi/virtio.json b/qapi/virtio.json index 9142818d198c..69dd107d0c9b 100644 --- a/qapi/virtio.json +++ b/qapi/virtio.json @@ -78,6 +78,150 @@ 'data': [ 'unknown', 'little', 'big' ] } +## +# @VirtioTransportFeature: +# +# An enumeration of Virtio device transport features, including virtio-ring +# +# Since: 5.1 +## + +{ 'enum': 'VirtioTransportFeature', + 'data': [ 'notify-on-empty', 'any-layout', 'version-1', 'iommu-platform', + 'ring-packed', 'order-platform', 'sr-iov', 'indirect-desc', + 'event-idx', 'bad-feature' ] +} + +## +# @VirtioSerialFeature: +# +# An enumeration of Virtio serial features +# +# Since: 5.1 +## + +{ 'enum': 'VirtioSerialFeature', + 'data': [ 'size', 'multiport', 'emerg-write' ] +} + +## +# @VirtioBlkFeature: +# +# An enumeration of Virtio block features +# +# Since: 5.1 +## + +{ 'enum': 'VirtioBlkFeature', + 'data': [ 'size-max', 'seg-max', 'geometry', 'ro', 'blk-size', 'topology', 'mq', 'discard', 'write-zeroes', 'barrier', 'scsi', 'flush', + 'config-wce' ] +} + +## +# @VirtioGpuFeature: +# +# An enumeration of Virtio gpu features +# +# Since: 5.1 +## + +{ 'enum': 'VirtioGpuFeature', + 'data': [ 'virgl', 'edid' ] +} + +## +# @VirtioNetFeature: +# +# An enumeration of Virtio net features +# +# Since: 5.1 +## + +{ 'enum': 'VirtioNetFeature', + 'data': [ 'csum', 'guest-csum', 'ctrl-guest-offloads', 'mtu', 'mac', + 'guest-tso4', 'guest-tso6', 'guest-ecn', 'guest-ufo', + 'host-tso4', 'host-tso6', 'host-ecn', 'host-ufo', 'mrg-rxbuf', + 'status', 'ctrl-vq', 'ctrl-rx', 'ctrl-vlan', 'ctrl-rx-extra', + 'guest-announce', 'mq', 'ctrl-mac-addr', 'standby', + 'speed-duplex', 'gso' ] +} + +## +# @VirtioScsiFeature: +# +# An enumeration of Virtio scsi features +# +# Since: 5.1 +## + +{ 'enum': 'VirtioScsiFeature', + 'data': [ 'inout', 'hotplug', 'change', 't10-pi' ] +} + +## +# @VirtioBalloonFeature: +# +# An enumeration of Virtio balloon features +# +# Since: 5.1 +## + +{ 'enum': 'VirtioBalloonFeature', + 'data': [ 'must-tell-host', 'stats-vq', 'deflate-on-oom', 'free-page-hint', + 'page-poison' ] +} + +## +# @VirtioIommuFeature: +# +# An enumeration of Virtio iommu features +# +# Since: 5.1 +## + +{ 'enum': 'VirtioIommuFeature', + 'data': [ 'input-range', 'domain-range', 'map-unmap', 'bypass', 'probe', + 'mmio' ] +} + +## +# @VirtioDeviceFeatures: +# +# An union to define the list of features for a virtio device +# +# Since: 5.1 +## + +{ 'union': 'VirtioDeviceFeatures', + 'data': { + 'virtio-serial': [ 'VirtioSerialFeature' ], + 'virtio-blk': [ 'VirtioBlkFeature' ], + 'virtio-gpu': [ 'VirtioGpuFeature' ], + 'virtio-net': [ 'VirtioNetFeature' ], + 'virtio-scsi': [ 'VirtioScsiFeature' ], + 'virtio-balloon': [ 'VirtioBalloonFeature' ], + 'virtio-iommu': [ 'VirtioIommuFeature' ] + } +} + +## +# @VirtioStatusFeatures: +# +# @transport: the list of transport features of the virtio device +# +# @device: the list of the virtio device specific features +# +# @unknown: virtio bitmap of the undecoded features +# +# Since: 5.1 +## + +{ 'struct': 'VirtioStatusFeatures', + 'data': { 'transport': [ 'VirtioTransportFeature' ], + 'device': 'VirtioDeviceFeatures', + 'unknown': 'uint64' } +} + ## # @VirtioStatus: # @@ -101,9 +245,9 @@ 'data': { 'device-id': 'int', 'device-endian': 'VirtioStatusEndianness', - 'guest-features': 'uint64', - 'host-features': 'uint64', - 'backend-features': 'uint64', + 'guest-features': 'VirtioStatusFeatures', + 'host-features': 'VirtioStatusFeatures', + 'backend-features': 'VirtioStatusFeatures', 'num-vqs': 'uint16' } } @@ -123,18 +267,40 @@ # # -> { "execute": "x-debug-virtio-status", # "arguments": { -# "path": "/machine/peripheral-anon/device[3]/virtio-backend" +# "path": "/machine/peripheral-anon/device[1]/virtio-backend" # } # } # <- { "return": { -# "backend-features": 0, -# "guest-features": 5111807911, -# "num-vqs": 3, -# "host-features": 6337593319, # "device-endian": "little", -# "device-id": 1 +# "device-id": 3, +# "backend-features": { +# "device": { +# "type": "virtio-serial", +# "data": [] +# }, +# "unknown": 0, +# "transport": [] +# }, +# "num-vqs": 64, +# "guest-features": { +# "device": { +# "type": "virtio-serial", +# "data": [ "multiport" ] +# }, +# "unknown": 0, +# "transport": [ "event-idx", "indirect-desc", "version-1" ] +# }, +# "host-features": { +# "device": { +# "type": "virtio-serial", +# "data": [ "emerg-write", "multiport" ] +# }, +# "unknown": 0, +# "transport": [ "event-idx", "indirect-desc", "bad-feature", +# "version-1", "any-layout", "notify-on-empty" ] +# } # } -# } +# } # ##

[RFC,v4,3/6] qmp: decode feature bits in virtio-status

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