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* [Qemu-devel] [PATCH v3] virtio: introduce `info virtio' hmp command
@ 2017-09-27 18:01 Jan Dakinevich
  2017-09-29 19:29 ` Michael S. Tsirkin
  0 siblings, 1 reply; 4+ messages in thread
From: Jan Dakinevich @ 2017-09-27 18:01 UTC (permalink / raw)
  To: qemu-devel, qemu-block
  Cc: Cornelia Huck, Kevin Wolf, Dr. David Alan Gilbert, Jan Dakinevich,
	Denis V. Lunev, Michael S. Tsirkin, Stefan Hajnoczi, Max Reitz,
	Amit Shah, Paolo Bonzini, Jason Wang, Markus Armbruster

The command is intended for exposing device specific virtio feature bits
and their negotiation status. It is convenient and useful for debug
purpose.

Names of features are taken from a devices via get_feature_name() within
VirtioDeviceClass. If certain device doesn't implement it, the command
will print only hexadecimal value of feature mask.

Cc: Denis V. Lunev <den@virtuozzo.com>
Signed-off-by: Jan Dakinevich <jan.dakinevich@virtuozzo.com>
---

v3:
* Avoid signed int
* Use virtio_vdev_has_feature()/virtio_host_has_feature()

v2: http://lists.nongnu.org/archive/html/qemu-devel/2017-09/msg07527.html
v1: http://lists.nongnu.org/archive/html/qemu-devel/2017-09/msg07247.html
---
 hmp-commands-info.hx        |  14 +++++
 hmp.c                       | 149 ++++++++++++++++++++++++++++++++++++++++++++
 hmp.h                       |   1 +
 hw/block/virtio-blk.c       |  21 +++++++
 hw/char/virtio-serial-bus.c |  15 +++++
 hw/display/virtio-gpu.c     |  13 ++++
 hw/net/virtio-net.c         |  35 +++++++++++
 hw/scsi/virtio-scsi.c       |  16 +++++
 hw/virtio/virtio-balloon.c  |  15 +++++
 hw/virtio/virtio-bus.c      |   1 +
 include/hw/virtio/virtio.h  |   2 +
 monitor.c                   |   1 +
 12 files changed, 283 insertions(+)

diff --git a/hmp-commands-info.hx b/hmp-commands-info.hx
index 4f1ece9..2550027 100644
--- a/hmp-commands-info.hx
+++ b/hmp-commands-info.hx
@@ -868,6 +868,20 @@ ETEXI
     },
 
 STEXI
+@item info virtio
+@findex virtio
+Display guest and host fetures for all virtio devices.
+ETEXI
+
+    {
+        .name       = "virtio",
+        .args_type  = "",
+        .params     = "",
+        .help       = "show virtio info",
+        .cmd        = hmp_info_virtio,
+    },
+
+STEXI
 @end table
 ETEXI
 
diff --git a/hmp.c b/hmp.c
index ace729d..f231395 100644
--- a/hmp.c
+++ b/hmp.c
@@ -43,6 +43,7 @@
 #include "hw/intc/intc.h"
 #include "migration/snapshot.h"
 #include "migration/misc.h"
+#include "hw/virtio/virtio.h"
 
 #ifdef CONFIG_SPICE
 #include <spice/enums.h>
@@ -2894,3 +2895,151 @@ void hmp_info_memory_size_summary(Monitor *mon, const QDict *qdict)
     }
     hmp_handle_error(mon, &err);
 }
+
+#define HMP_INFO_VIRTIO_INDENT 2
+#define HMP_INFO_VIRTIO_FIELD 32
+
+static void hmp_info_virtio_print_status(Monitor *mon, VirtIODevice *vdev)
+{
+    uint8_t status[] = {
+        VIRTIO_CONFIG_S_ACKNOWLEDGE,
+        VIRTIO_CONFIG_S_DRIVER,
+        VIRTIO_CONFIG_S_DRIVER_OK,
+        VIRTIO_CONFIG_S_FEATURES_OK,
+        VIRTIO_CONFIG_S_NEEDS_RESET,
+        VIRTIO_CONFIG_S_FAILED,
+    };
+    const char *names[] = {
+        "acknowledge",
+        "driver",
+        "driver_ok",
+        "features_ok",
+        "needs_reset"
+        "failed",
+    };
+    const char *comma = "";
+    unsigned idx;
+
+    monitor_printf(mon, "%*sstatus:           0x%02"PRIx8" ",
+                   HMP_INFO_VIRTIO_INDENT, "", vdev->status);
+
+    for (idx = 0; idx < ARRAY_SIZE(status); idx++) {
+        if (!(vdev->status & status[idx])) {
+            continue;
+        }
+        monitor_printf(mon, "%s%s", comma, names[idx]);
+        if (names[idx]) {
+            comma = ",";
+        }
+    }
+    monitor_printf(mon, "\n");
+}
+
+static void hmp_info_virtio_print_common_features(Monitor *mon,
+                                                  VirtIODevice *vdev)
+{
+    uint64_t features[] = {
+        VIRTIO_RING_F_INDIRECT_DESC,
+        VIRTIO_RING_F_EVENT_IDX,
+        VIRTIO_F_NOTIFY_ON_EMPTY,
+        VIRTIO_F_ANY_LAYOUT,
+        VIRTIO_F_IOMMU_PLATFORM,
+        VIRTIO_F_VERSION_1,
+    };
+    const char *names[] = {
+        "indirect_desc",
+        "event_idx",
+        "notify_on_empty",
+        "any_layout",
+        "iommu_platform",
+        "version_1",
+    };
+    unsigned idx;
+
+    monitor_printf(mon, "%*scommon features:\n", HMP_INFO_VIRTIO_INDENT, "");
+
+    for (idx = 0; idx < ARRAY_SIZE(features); idx++) {
+        const char *ack = virtio_vdev_has_feature(vdev, features[idx])
+                ? "acked" : "";
+
+        if (!virtio_host_has_feature(vdev, features[idx])) {
+            continue;
+        }
+        monitor_printf(mon, "%*s%*s%*s\n", HMP_INFO_VIRTIO_INDENT, "",
+                       HMP_INFO_VIRTIO_FIELD, names[idx],
+                       HMP_INFO_VIRTIO_FIELD, ack);
+    }
+}
+
+static void hmp_info_virtio_print_specific_features(Monitor *mon,
+                                                    VirtIODevice *vdev)
+{
+    VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
+    unsigned idx;
+
+    if (!vdc->get_feature_name) {
+        return;
+    }
+
+    monitor_printf(mon, "%*sspecific features:\n", HMP_INFO_VIRTIO_INDENT, "");
+
+    for (idx = 0; idx < 64; idx++) {
+        const char *name = vdc->get_feature_name(vdev, idx);
+        const char *ack = virtio_vdev_has_feature(vdev, idx) ? "acked" : "";
+
+        if (!name) {
+            continue;
+        }
+        if (!virtio_host_has_feature(vdev, idx)) {
+            continue;
+        }
+        monitor_printf(mon, "%*s%*s%*s\n", HMP_INFO_VIRTIO_INDENT, "",
+                       HMP_INFO_VIRTIO_FIELD, name, HMP_INFO_VIRTIO_FIELD, ack);
+    }
+}
+
+static void hmp_info_virtio_print(Monitor *mon, VirtIODevice *vdev)
+{
+    char *path = qdev_get_dev_path(DEVICE(vdev));
+
+    monitor_printf(mon, "%s at %s\n", object_get_typename(OBJECT(vdev)), path);
+    g_free(path);
+
+    hmp_info_virtio_print_status(mon, vdev);
+
+    monitor_printf(mon, "%*shost features:    0x%016"PRIx64"\n",
+                   HMP_INFO_VIRTIO_INDENT, "", vdev->host_features);
+    monitor_printf(mon, "%*sguest features:   0x%016"PRIx64"\n",
+                   HMP_INFO_VIRTIO_INDENT, "", vdev->guest_features);
+
+    hmp_info_virtio_print_common_features(mon, vdev);
+    hmp_info_virtio_print_specific_features(mon, vdev);
+}
+
+static void hmp_info_virtio_recursive(Monitor *mon, BusState *bus)
+{
+    BusChild *kid;
+
+    QTAILQ_FOREACH(kid, &bus->children, sibling) {
+        DeviceState *dev = kid->child;
+        BusState *child;
+
+        if (object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_DEVICE)) {
+            hmp_info_virtio_print(mon, VIRTIO_DEVICE(dev));
+        }
+        QLIST_FOREACH(child, &dev->child_bus, sibling) {
+            hmp_info_virtio_recursive(mon, child);
+        }
+    }
+}
+
+void hmp_info_virtio(Monitor *mon, const QDict *qdict)
+{
+    BusState *bus = sysbus_get_default();
+
+    if (!bus) {
+        return;
+    }
+
+    hmp_info_virtio_recursive(mon, bus);
+}
diff --git a/hmp.h b/hmp.h
index 3605003..3e8f30a 100644
--- a/hmp.h
+++ b/hmp.h
@@ -146,5 +146,6 @@ void hmp_info_ramblock(Monitor *mon, const QDict *qdict);
 void hmp_hotpluggable_cpus(Monitor *mon, const QDict *qdict);
 void hmp_info_vm_generation_id(Monitor *mon, const QDict *qdict);
 void hmp_info_memory_size_summary(Monitor *mon, const QDict *qdict);
+void hmp_info_virtio(Monitor *mon, const QDict *qdict);
 
 #endif
diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
index 05d1440..c77f651 100644
--- a/hw/block/virtio-blk.c
+++ b/hw/block/virtio-blk.c
@@ -1017,6 +1017,26 @@ static Property virtio_blk_properties[] = {
     DEFINE_PROP_END_OF_LIST(),
 };
 
+static const char *virtio_blk_get_feature_name(VirtIODevice *vdev,
+                                               unsigned feature)
+{
+    static const char *names[] = {
+        [VIRTIO_BLK_F_BARRIER] = "barrier",
+        [VIRTIO_BLK_F_SIZE_MAX] = "size_max",
+        [VIRTIO_BLK_F_SEG_MAX] = "seg_max",
+        [VIRTIO_BLK_F_RO] = "ro",
+        [VIRTIO_BLK_F_BLK_SIZE] = "blk_size",
+        [VIRTIO_BLK_F_SCSI] = "scsi",
+        [VIRTIO_BLK_F_TOPOLOGY] = "topology",
+        [VIRTIO_BLK_F_FLUSH] = "flush",
+        [VIRTIO_BLK_F_MQ] = "mq",
+    };
+    if (feature >= ARRAY_SIZE(names)) {
+        return NULL;
+    }
+    return names[feature];
+}
+
 static void virtio_blk_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
@@ -1030,6 +1050,7 @@ static void virtio_blk_class_init(ObjectClass *klass, void *data)
     vdc->get_config = virtio_blk_update_config;
     vdc->set_config = virtio_blk_set_config;
     vdc->get_features = virtio_blk_get_features;
+    vdc->get_feature_name = virtio_blk_get_feature_name;
     vdc->set_status = virtio_blk_set_status;
     vdc->reset = virtio_blk_reset;
     vdc->save = virtio_blk_save_device;
diff --git a/hw/char/virtio-serial-bus.c b/hw/char/virtio-serial-bus.c
index 9470bd7..41f4466 100644
--- a/hw/char/virtio-serial-bus.c
+++ b/hw/char/virtio-serial-bus.c
@@ -1156,6 +1156,20 @@ static Property virtio_serial_properties[] = {
     DEFINE_PROP_END_OF_LIST(),
 };
 
+static const char *virtio_serial_get_feature_name(VirtIODevice *vdev,
+                                                  unsigned feature)
+{
+    static const char *names[] = {
+        [VIRTIO_CONSOLE_F_SIZE] = "size",
+        [VIRTIO_CONSOLE_F_MULTIPORT] = "multiport",
+        [VIRTIO_CONSOLE_F_EMERG_WRITE] = "emerg_write",
+    };
+    if (feature >= ARRAY_SIZE(names)) {
+        return NULL;
+    }
+    return names[feature];
+}
+
 static void virtio_serial_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
@@ -1170,6 +1184,7 @@ static void virtio_serial_class_init(ObjectClass *klass, void *data)
     vdc->realize = virtio_serial_device_realize;
     vdc->unrealize = virtio_serial_device_unrealize;
     vdc->get_features = get_features;
+    vdc->get_feature_name = virtio_serial_get_feature_name;
     vdc->get_config = get_config;
     vdc->set_config = set_config;
     vdc->set_status = set_status;
diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index 3a8f1e1..49aa214 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -1307,6 +1307,18 @@ static Property virtio_gpu_properties[] = {
     DEFINE_PROP_END_OF_LIST(),
 };
 
+static const char *virtio_gpu_get_feature_name(VirtIODevice *vdev,
+                                               unsigned feature)
+{
+    static const char *names[] = {
+        [VIRTIO_GPU_F_VIRGL] = "virgl",
+    };
+    if (feature >= ARRAY_SIZE(names)) {
+        return NULL;
+    }
+    return names[feature];
+}
+
 static void virtio_gpu_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
@@ -1317,6 +1329,7 @@ static void virtio_gpu_class_init(ObjectClass *klass, void *data)
     vdc->get_config = virtio_gpu_get_config;
     vdc->set_config = virtio_gpu_set_config;
     vdc->get_features = virtio_gpu_get_features;
+    vdc->get_feature_name = virtio_gpu_get_feature_name;
     vdc->set_features = virtio_gpu_set_features;
 
     vdc->reset = virtio_gpu_reset;
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 148071a..f4d20a85 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -2154,6 +2154,40 @@ static Property virtio_net_properties[] = {
     DEFINE_PROP_END_OF_LIST(),
 };
 
+static const char *virtio_net_get_feature_name(VirtIODevice *vdev,
+                                               unsigned feature)
+{
+    static const char *names[] = {
+        [VIRTIO_NET_F_CSUM] = "csum",
+        [VIRTIO_NET_F_GUEST_CSUM] = "guest_csum",
+        [VIRTIO_NET_F_CTRL_GUEST_OFFLOADS] = "ctrl_guest_offloads",
+        [VIRTIO_NET_F_MTU] = "mtu",
+        [VIRTIO_NET_F_MAC] = "mac",
+        [VIRTIO_NET_F_GSO] = "gso",
+        [VIRTIO_NET_F_GUEST_TSO4] = "guest_tso4",
+        [VIRTIO_NET_F_GUEST_TSO6] = "guest_tso6",
+        [VIRTIO_NET_F_GUEST_ECN] = "guest_ecn",
+        [VIRTIO_NET_F_GUEST_UFO] = "guest_ufo",
+        [VIRTIO_NET_F_HOST_TSO4] = "host_tso4",
+        [VIRTIO_NET_F_HOST_TSO6] = "host_tso6",
+        [VIRTIO_NET_F_HOST_ECN] = "host_ecn",
+        [VIRTIO_NET_F_HOST_UFO] = "host_ufo",
+        [VIRTIO_NET_F_MRG_RXBUF] = "mrg_rxbuf",
+        [VIRTIO_NET_F_STATUS] = "status",
+        [VIRTIO_NET_F_CTRL_VQ] = "ctrl_vq",
+        [VIRTIO_NET_F_CTRL_RX] = "ctrl_rx",
+        [VIRTIO_NET_F_CTRL_VLAN] = "ctrl_vlan",
+        [VIRTIO_NET_F_CTRL_RX_EXTRA] = "ctrl_rx_extra",
+        [VIRTIO_NET_F_GUEST_ANNOUNCE] = "guest_announce",
+        [VIRTIO_NET_F_MQ] = "mq",
+        [VIRTIO_NET_F_CTRL_MAC_ADDR] = "ctrl_mac_addr",
+    };
+    if (feature >= ARRAY_SIZE(names)) {
+        return NULL;
+    }
+    return names[feature];
+}
+
 static void virtio_net_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
@@ -2169,6 +2203,7 @@ static void virtio_net_class_init(ObjectClass *klass, void *data)
     vdc->get_features = virtio_net_get_features;
     vdc->set_features = virtio_net_set_features;
     vdc->bad_features = virtio_net_bad_features;
+    vdc->get_feature_name = virtio_net_get_feature_name;
     vdc->reset = virtio_net_reset;
     vdc->set_status = virtio_net_set_status;
     vdc->guest_notifier_mask = virtio_net_guest_notifier_mask;
diff --git a/hw/scsi/virtio-scsi.c b/hw/scsi/virtio-scsi.c
index 3aa9971..b53cf8b 100644
--- a/hw/scsi/virtio-scsi.c
+++ b/hw/scsi/virtio-scsi.c
@@ -942,6 +942,21 @@ static const VMStateDescription vmstate_virtio_scsi = {
     },
 };
 
+static const char *virtio_scsi_get_feature_name(VirtIODevice *vdev,
+                                                unsigned feature)
+{
+    static const char *names[] = {
+        [VIRTIO_SCSI_F_INOUT] = "inout",
+        [VIRTIO_SCSI_F_HOTPLUG] = "hotplug",
+        [VIRTIO_SCSI_F_CHANGE] = "change",
+        [VIRTIO_SCSI_F_T10_PI] = "t10_pi",
+    };
+    if (feature >= ARRAY_SIZE(names)) {
+        return NULL;
+    }
+    return names[feature];
+}
+
 static void virtio_scsi_common_class_init(ObjectClass *klass, void *data)
 {
     VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
@@ -964,6 +979,7 @@ static void virtio_scsi_class_init(ObjectClass *klass, void *data)
     vdc->unrealize = virtio_scsi_device_unrealize;
     vdc->set_config = virtio_scsi_set_config;
     vdc->get_features = virtio_scsi_get_features;
+    vdc->get_feature_name = virtio_scsi_get_feature_name;
     vdc->reset = virtio_scsi_reset;
     vdc->start_ioeventfd = virtio_scsi_dataplane_start;
     vdc->stop_ioeventfd = virtio_scsi_dataplane_stop;
diff --git a/hw/virtio/virtio-balloon.c b/hw/virtio/virtio-balloon.c
index 37cde38..b396eb1 100644
--- a/hw/virtio/virtio-balloon.c
+++ b/hw/virtio/virtio-balloon.c
@@ -509,6 +509,20 @@ static Property virtio_balloon_properties[] = {
     DEFINE_PROP_END_OF_LIST(),
 };
 
+static const char *virtio_balloon_get_feature_name(VirtIODevice *vdev,
+                                                   unsigned feature)
+{
+    static const char *names[] = {
+        [VIRTIO_BALLOON_F_MUST_TELL_HOST] = "must_tell_host",
+        [VIRTIO_BALLOON_F_STATS_VQ] = "stats_vq",
+        [VIRTIO_BALLOON_F_DEFLATE_ON_OOM] = "deflate_on_oom",
+    };
+    if (feature >= ARRAY_SIZE(names)) {
+        return NULL;
+    }
+    return names[feature];
+}
+
 static void virtio_balloon_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
@@ -523,6 +537,7 @@ static void virtio_balloon_class_init(ObjectClass *klass, void *data)
     vdc->get_config = virtio_balloon_get_config;
     vdc->set_config = virtio_balloon_set_config;
     vdc->get_features = virtio_balloon_get_features;
+    vdc->get_feature_name = virtio_balloon_get_feature_name;
     vdc->set_status = virtio_balloon_set_status;
     vdc->vmsd = &vmstate_virtio_balloon_device;
 }
diff --git a/hw/virtio/virtio-bus.c b/hw/virtio/virtio-bus.c
index 3042232..e9ae54f 100644
--- a/hw/virtio/virtio-bus.c
+++ b/hw/virtio/virtio-bus.c
@@ -30,6 +30,7 @@
 #include "hw/virtio/virtio-bus.h"
 #include "hw/virtio/virtio.h"
 #include "exec/address-spaces.h"
+#include "monitor/monitor.h"
 
 /* #define DEBUG_VIRTIO_BUS */
 
diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index 80c45c3..3ea2cd0 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -141,6 +141,8 @@ typedef struct VirtioDeviceClass {
     void (*save)(VirtIODevice *vdev, QEMUFile *f);
     int (*load)(VirtIODevice *vdev, QEMUFile *f, int version_id);
     const VMStateDescription *vmsd;
+    /* Get the name of device specific feature */
+    const char *(*get_feature_name)(VirtIODevice *vdev, unsigned feature);
 } VirtioDeviceClass;
 
 void virtio_instance_init_common(Object *proxy_obj, void *data,
diff --git a/monitor.c b/monitor.c
index f4856b9..779f168 100644
--- a/monitor.c
+++ b/monitor.c
@@ -78,6 +78,7 @@
 #include "sysemu/cpus.h"
 #include "qemu/cutils.h"
 #include "qapi/qmp/dispatch.h"
+#include "hw/virtio/virtio-bus.h"
 
 #if defined(TARGET_S390X)
 #include "hw/s390x/storage-keys.h"
-- 
2.1.4

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Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
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2017-09-27 18:01 [Qemu-devel] [PATCH v3] virtio: introduce `info virtio' hmp command Jan Dakinevich
2017-09-29 19:29 ` Michael S. Tsirkin
2017-09-30  0:52   ` Jan Dakinevich
2017-10-01  3:22     ` Michael S. Tsirkin

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