[libvirt] [PATCH 3/3] qemu: Add multiqueue support for vhost-user-scsi/blk

[Li Feng]

The format like this:

    <vhost-user-blk-pci type='unix'>
        <source type='bind' path='/tmp/vhost-blk.sock'>
            <reconnect enabled='yes' timeout='5' />
        </source>
        <queue num='4'/>
    </vhost-user-blk-pci>

Signed-off-by: Li Feng <fen...@smartx.com>
---
 src/conf/device_conf.h                                   |  5 +++++
 src/conf/domain_conf.c                                   | 14 ++++++++++++++
 src/qemu/qemu_command.c                                  |  7 +++++++
 tests/qemuxml2argvdata/vhost-user-blk.x86_64-latest.args |  2 +-
 tests/qemuxml2argvdata/vhost-user-blk.xml                |  1 +
 5 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/src/conf/device_conf.h b/src/conf/device_conf.h
index d0854925e3..c3c722edd3 100644
--- a/src/conf/device_conf.h
+++ b/src/conf/device_conf.h
@@ -179,6 +179,11 @@ struct _virDomainDeviceInfo {
      * cases we might want to prevent that from happening by
      * locking the isolation group */
     bool isolationGroupLocked;
+
+    /* vhost-user-scsi/blk/nvme support multiqueue, parse the queue
+     * num from xml.
+     */
+    unsigned int num_queues;
 };
 
 void virDomainDeviceInfoClear(virDomainDeviceInfoPtr info);
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index fd53fab271..eeed88e41e 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -7483,10 +7483,12 @@ virDomainDeviceInfoParseXML(virDomainXMLOptionPtr 
xmlopt ATTRIBUTE_UNUSED,
     xmlNodePtr alias = NULL;
     xmlNodePtr boot = NULL;
     xmlNodePtr rom = NULL;
+    xmlNodePtr queue = NULL;
     int ret = -1;
     VIR_AUTOFREE(char *) romenabled = NULL;
     VIR_AUTOFREE(char *) rombar = NULL;
     VIR_AUTOFREE(char *) aliasStr = NULL;
+    VIR_AUTOFREE(char *) queueStr = NULL;
 
     virDomainDeviceInfoClear(info);
 
@@ -7510,6 +7512,9 @@ virDomainDeviceInfoParseXML(virDomainXMLOptionPtr xmlopt 
ATTRIBUTE_UNUSED,
                        (flags & VIR_DOMAIN_DEF_PARSE_ALLOW_ROM) &&
                        virXMLNodeNameEqual(cur, "rom")) {
                 rom = cur;
+            } else if (queue == NULL &&
+                       virXMLNodeNameEqual(cur, "queue")) {
+                queue = cur;
             }
         }
         cur = cur->next;
@@ -7563,6 +7568,15 @@ virDomainDeviceInfoParseXML(virDomainXMLOptionPtr xmlopt 
ATTRIBUTE_UNUSED,
         virDomainDeviceAddressParseXML(address, info) < 0)
         goto cleanup;
 
+    if (queue) {
+        queueStr = virXMLPropString(queue, "num");
+        if (virStrToLong_uip(queueStr, NULL, 10, &info->num_queues) < 0) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                           _("Cannot parse <queue> 'num' attribute '%s'"), 
queueStr);
+
+            goto cleanup;
+        }
+    }
 
     ret = 0;
  cleanup:
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 336ca3f729..7a3c695ac1 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -10737,6 +10737,13 @@ qemuBuildVhostUserChrDeviceStr(char **deviceStr,
     virBufferAsprintf(&buf, "%s,chardev=char%s,id=%s",
                       device_type,
                       vhostuser->info.alias, vhostuser->info.alias);
+    if (vhostuser->info.num_queues > 0) {
+        if ((virDomainChrDeviceType)vhostuser->deviceType == 
VIR_DOMAIN_CHR_DEVICE_TYPE_VHOST_USER_SCSI) {
+            virBufferAsprintf(&buf, ",num_queues=%d", 
vhostuser->info.num_queues);
+        } else if ((virDomainChrDeviceType)vhostuser->deviceType == 
VIR_DOMAIN_CHR_DEVICE_TYPE_VHOST_USER_BLK) {
+            virBufferAsprintf(&buf, ",num-queues=%d", 
vhostuser->info.num_queues);
+        }
+    }
 
     if (qemuBuildDeviceAddressStr(&buf, def, &vhostuser->info, qemuCaps) < 0)
         return -1;
diff --git a/tests/qemuxml2argvdata/vhost-user-blk.x86_64-latest.args 
b/tests/qemuxml2argvdata/vhost-user-blk.x86_64-latest.args
index 4c67be1863..ea99f5949d 100644
--- a/tests/qemuxml2argvdata/vhost-user-blk.x86_64-latest.args
+++ b/tests/qemuxml2argvdata/vhost-user-blk.x86_64-latest.args
@@ -31,7 +31,7 @@ file=/tmp/lib/domain--1-test/master-key.aes \
 -chardev socket,id=charvhost-user-blk-disk0,path=/tmp/vhost-blk.sock,\
 reconnect=1 \
 -device vhost-user-blk-pci,chardev=charvhost-user-blk-disk0,\
-id=vhost-user-blk-disk0 \
+id=vhost-user-blk-disk0,num-queues=4 \
 -sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,\
 resourcecontrol=deny \
 -msg timestamp=on
diff --git a/tests/qemuxml2argvdata/vhost-user-blk.xml 
b/tests/qemuxml2argvdata/vhost-user-blk.xml
index c9ff7650cb..276fea14b5 100644
--- a/tests/qemuxml2argvdata/vhost-user-blk.xml
+++ b/tests/qemuxml2argvdata/vhost-user-blk.xml
@@ -32,6 +32,7 @@
         <source type='bind' path='/tmp/vhost-blk.sock'>
             <reconnect enabled='yes' timeout='1' />
         </source>
+        <queue num='4'/>
     </vhost-user-blk-pci>
   </devices>
 </domain>
-- 
2.11.0


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