5:32 a.m.
QEMU recently (86044b24e) introduced packed virtqueues for virtio that
supposedly have better cache utilization and performance compared to the
default split queues. So here's a patch set that expose the virtio
parameter as a optional libvirt XML attribute to virtio-backed devices,
e.g.:
<interface type='user'>
<mac address='00:11:22:33:44:55'/>
<model type='virtio'/>
<driver packed='on'/>
</interface>
The default value if the attribute is omitted is still 'off' and regular
split virtqueues are used.
Bjoern Walk (4):
qemu: capabilities: add 'packed' capability
conf: domain: support for virtio packed option
qemu: command: support for virtio packed option
docs: documentation for virtio packed option
docs/formatdomain.html.in | 8 +++++
docs/schemas/domaincommon.rng | 5 +++
src/conf/domain_conf.c | 28 ++++++++++++++++
src/conf/domain_conf.h | 1 +
src/qemu/qemu_capabilities.c | 6 ++++
src/qemu/qemu_capabilities.h | 1 +
src/qemu/qemu_command.c | 10 ++++++
.../caps_4.2.0.aarch64.xml | 1 +
.../caps_4.2.0.x86_64.xml | 1 +
.../caps_5.0.0.aarch64.xml | 1 +
.../qemucapabilitiesdata/caps_5.0.0.ppc64.xml | 1 +
.../caps_5.0.0.x86_64.xml | 1 +
tests/qemuxml2argvdata/virtio-options.args | 32 ++++++++++---------
tests/qemuxml2argvdata/virtio-options.xml | 26 +++++++--------
tests/qemuxml2argvtest.c | 3 +-
tests/qemuxml2xmltest.c | 3 +-
16 files changed, 98 insertions(+), 30 deletions(-)
--
2.24.1
5:32 a.m.
New subject: [PATCH 1/4] qemu: capabilities: add 'packed' capability
Add the capability for QEMU's packed virtqueues for virtio that supposedly have
better cache utilization and performance compared to the default split queues.
Signed-off-by: Bjoern Walk <bwalk(a)linux.ibm.com>
---
src/qemu/qemu_capabilities.c | 6 ++++++
src/qemu/qemu_capabilities.h | 1 +
tests/qemucapabilitiesdata/caps_4.2.0.aarch64.xml | 1 +
tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml | 1 +
tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml | 1 +
tests/qemucapabilitiesdata/caps_5.0.0.ppc64.xml | 1 +
tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml | 1 +
7 files changed, 12 insertions(+)
diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index a95a60c3..3bc876d7 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -567,6 +567,7 @@ VIR_ENUM_IMPL(virQEMUCaps,
"query-named-block-nodes.flat",
"blockdev-snapshot.allow-write-only-overlay",
"blockdev-reopen",
+ "virtio.packed",
);
@@ -1291,6 +1292,7 @@ static struct virQEMUCapsStringFlags
virQEMUCapsDevicePropsVirtioBalloon[] = {
{ "disable-legacy", QEMU_CAPS_VIRTIO_PCI_DISABLE_LEGACY },
{ "iommu_platform", QEMU_CAPS_VIRTIO_PCI_IOMMU_PLATFORM },
{ "ats", QEMU_CAPS_VIRTIO_PCI_ATS },
+ { "packed", QEMU_CAPS_VIRTIO_PACKED_QUEUES },
};
static struct virQEMUCapsStringFlags virQEMUCapsDevicePropsVirtioBlk[] = {
@@ -1304,6 +1306,7 @@ static struct virQEMUCapsStringFlags
virQEMUCapsDevicePropsVirtioBlk[] = {
{ "iommu_platform", QEMU_CAPS_VIRTIO_PCI_IOMMU_PLATFORM },
{ "ats", QEMU_CAPS_VIRTIO_PCI_ATS },
{ "write-cache", QEMU_CAPS_DISK_WRITE_CACHE },
+ { "packed", QEMU_CAPS_VIRTIO_PACKED_QUEUES },
};
static struct virQEMUCapsStringFlags virQEMUCapsDevicePropsVirtioNet[] = {
@@ -1316,6 +1319,7 @@ static struct virQEMUCapsStringFlags
virQEMUCapsDevicePropsVirtioNet[] = {
{ "iommu_platform", QEMU_CAPS_VIRTIO_PCI_IOMMU_PLATFORM },
{ "ats", QEMU_CAPS_VIRTIO_PCI_ATS },
{ "failover", QEMU_CAPS_VIRTIO_NET_FAILOVER },
+ { "packed", QEMU_CAPS_VIRTIO_PACKED_QUEUES },
};
static struct virQEMUCapsStringFlags virQEMUCapsDevicePropsSpaprPCIHostBridge[] = {
@@ -1327,6 +1331,7 @@ static struct virQEMUCapsStringFlags
virQEMUCapsDevicePropsVirtioSCSI[] = {
{ "disable-legacy", QEMU_CAPS_VIRTIO_PCI_DISABLE_LEGACY },
{ "iommu_platform", QEMU_CAPS_VIRTIO_PCI_IOMMU_PLATFORM },
{ "ats", QEMU_CAPS_VIRTIO_PCI_ATS },
+ { "packed", QEMU_CAPS_VIRTIO_PACKED_QUEUES },
};
static struct virQEMUCapsStringFlags virQEMUCapsDevicePropsVfioPCI[] = {
@@ -1395,6 +1400,7 @@ static struct virQEMUCapsStringFlags
virQEMUCapsDevicePropsVirtioGpu[] = {
{ "disable-legacy", QEMU_CAPS_VIRTIO_PCI_DISABLE_LEGACY },
{ "iommu_platform", QEMU_CAPS_VIRTIO_PCI_IOMMU_PLATFORM },
{ "ats", QEMU_CAPS_VIRTIO_PCI_ATS },
+ { "packed", QEMU_CAPS_VIRTIO_PACKED_QUEUES },
};
static struct virQEMUCapsStringFlags virQEMUCapsDevicePropsICH9[] = {
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index f0961e27..21c09974 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -548,6 +548,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check
*/
QEMU_CAPS_QMP_QUERY_NAMED_BLOCK_NODES_FLAT, /* query-named-block-nodes supports the
'flat' option */
QEMU_CAPS_BLOCKDEV_SNAPSHOT_ALLOW_WRITE_ONLY, /* blockdev-snapshot has the
'allow-write-only-overlay' feature */
QEMU_CAPS_BLOCKDEV_REOPEN, /* 'blockdev-reopen' qmp command is supported */
+ QEMU_CAPS_VIRTIO_PACKED_QUEUES, /* virtio packed virtqueue support */
QEMU_CAPS_LAST /* this must always be the last item */
} virQEMUCapsFlags;
diff --git a/tests/qemucapabilitiesdata/caps_4.2.0.aarch64.xml
b/tests/qemucapabilitiesdata/caps_4.2.0.aarch64.xml
index 640ce29c..f1b7fbbe 100644
--- a/tests/qemucapabilitiesdata/caps_4.2.0.aarch64.xml
+++ b/tests/qemucapabilitiesdata/caps_4.2.0.aarch64.xml
@@ -179,6 +179,7 @@
<flag name='rng-builtin'/>
<flag name='virtio-net.failover'/>
<flag name='vhost-user-fs'/>
+ <flag name='virtio.packed'/>
<version>4001050</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>61700242</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml
b/tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml
index 83e804ea..15388967 100644
--- a/tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml
@@ -223,6 +223,7 @@
<flag name='rng-builtin'/>
<flag name='virtio-net.failover'/>
<flag name='vhost-user-fs'/>
+ <flag name='virtio.packed'/>
<version>4002000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>43100242</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml
b/tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml
index e52c6060..9ef8564a 100644
--- a/tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml
@@ -181,6 +181,7 @@
<flag name='virtio-net.failover'/>
<flag name='cpu.kvm-no-adjvtime'/>
<flag name='vhost-user-fs'/>
+ <flag name='virtio.packed'/>
<version>4002050</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>61700241</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.0.0.ppc64.xml
b/tests/qemucapabilitiesdata/caps_5.0.0.ppc64.xml
index 85fdb21c..a2d78ac0 100644
--- a/tests/qemucapabilitiesdata/caps_5.0.0.ppc64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.0.0.ppc64.xml
@@ -189,6 +189,7 @@
<flag name='vhost-user-fs'/>
<flag name='query-named-block-nodes.flat'/>
<flag name='blockdev-snapshot.allow-write-only-overlay'/>
+ <flag name='virtio.packed'/>
<version>4002050</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>42900241</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
b/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
index d773f7e3..b6a6b3be 100644
--- a/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
@@ -226,6 +226,7 @@
<flag name='vhost-user-fs'/>
<flag name='query-named-block-nodes.flat'/>
<flag name='blockdev-snapshot.allow-write-only-overlay'/>
+ <flag name='virtio.packed'/>
<version>4002050</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>43100241</microcodeVersion>
--
2.24.1
5:35 a.m.
New subject: [PATCH 1/4] qemu: capabilities: add 'packed' capability
Bjoern Walk <bwalk(a)linux.ibm.com> [2020-03-26, 11:32AM +0100]:
Add the capability for QEMU's packed virtqueues for virtio that
supposedly have
better cache utilization and performance compared to the default split queues.
Signed-off-by: Bjoern Walk <bwalk(a)linux.ibm.com>
---
src/qemu/qemu_capabilities.c | 6 ++++++
src/qemu/qemu_capabilities.h | 1 +
tests/qemucapabilitiesdata/caps_4.2.0.aarch64.xml | 1 +
tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml | 1 +
tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml | 1 +
tests/qemucapabilitiesdata/caps_5.0.0.ppc64.xml | 1 +
tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml | 1 +
7 files changed, 12 insertions(+)
If this https://www.redhat.com/archives/libvir-list/2020-March/msg00979.html
is accepted then we need to squash this in:
diff --git a/tests/qemucapabilitiesdata/caps_4.2.0.s390x.xml
b/tests/qemucapabilitiesdata/caps_4.2.0.s390x.xml
index e46259e669..61a34da2d8 100644
--- a/tests/qemucapabilitiesdata/caps_4.2.0.s390x.xml
+++ b/tests/qemucapabilitiesdata/caps_4.2.0.s390x.xml
@@ -144,6 +144,7 @@
<flag name='rng-builtin'/>
<flag name='virtio-net.failover'/>
<flag name='vhost-user-fs'/>
+ <flag name='packed'/>
<version>4002000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>39100242</microcodeVersion>
8:18 a.m.
New subject: [PATCH 1/4] qemu: capabilities: add 'packed' capability
Looks good...
Reviewed-by: Boris Fiuczynski <fiuczy(a)linux.ibm.com>
On 3/26/20 11:32 AM, Bjoern Walk wrote:
Add the capability for QEMU's packed virtqueues for virtio that
supposedly have
better cache utilization and performance compared to the default split queues.
Signed-off-by: Bjoern Walk <bwalk(a)linux.ibm.com>
---
src/qemu/qemu_capabilities.c | 6 ++++++
src/qemu/qemu_capabilities.h | 1 +
tests/qemucapabilitiesdata/caps_4.2.0.aarch64.xml | 1 +
tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml | 1 +
tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml | 1 +
tests/qemucapabilitiesdata/caps_5.0.0.ppc64.xml | 1 +
tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml | 1 +
7 files changed, 12 insertions(+)
diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index a95a60c3..3bc876d7 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -567,6 +567,7 @@ VIR_ENUM_IMPL(virQEMUCaps,
"query-named-block-nodes.flat",
"blockdev-snapshot.allow-write-only-overlay",
"blockdev-reopen",
+ "virtio.packed",
);
@@ -1291,6 +1292,7 @@ static struct virQEMUCapsStringFlags
virQEMUCapsDevicePropsVirtioBalloon[] = {
{ "disable-legacy", QEMU_CAPS_VIRTIO_PCI_DISABLE_LEGACY },
{ "iommu_platform", QEMU_CAPS_VIRTIO_PCI_IOMMU_PLATFORM },
{ "ats", QEMU_CAPS_VIRTIO_PCI_ATS },
+ { "packed", QEMU_CAPS_VIRTIO_PACKED_QUEUES },
};
static struct virQEMUCapsStringFlags virQEMUCapsDevicePropsVirtioBlk[] = {
@@ -1304,6 +1306,7 @@ static struct virQEMUCapsStringFlags
virQEMUCapsDevicePropsVirtioBlk[] = {
{ "iommu_platform", QEMU_CAPS_VIRTIO_PCI_IOMMU_PLATFORM },
{ "ats", QEMU_CAPS_VIRTIO_PCI_ATS },
{ "write-cache", QEMU_CAPS_DISK_WRITE_CACHE },
+ { "packed", QEMU_CAPS_VIRTIO_PACKED_QUEUES },
};
static struct virQEMUCapsStringFlags virQEMUCapsDevicePropsVirtioNet[] = {
@@ -1316,6 +1319,7 @@ static struct virQEMUCapsStringFlags
virQEMUCapsDevicePropsVirtioNet[] = {
{ "iommu_platform", QEMU_CAPS_VIRTIO_PCI_IOMMU_PLATFORM },
{ "ats", QEMU_CAPS_VIRTIO_PCI_ATS },
{ "failover", QEMU_CAPS_VIRTIO_NET_FAILOVER },
+ { "packed", QEMU_CAPS_VIRTIO_PACKED_QUEUES },
};
static struct virQEMUCapsStringFlags virQEMUCapsDevicePropsSpaprPCIHostBridge[] = {
@@ -1327,6 +1331,7 @@ static struct virQEMUCapsStringFlags
virQEMUCapsDevicePropsVirtioSCSI[] = {
{ "disable-legacy", QEMU_CAPS_VIRTIO_PCI_DISABLE_LEGACY },
{ "iommu_platform", QEMU_CAPS_VIRTIO_PCI_IOMMU_PLATFORM },
{ "ats", QEMU_CAPS_VIRTIO_PCI_ATS },
+ { "packed", QEMU_CAPS_VIRTIO_PACKED_QUEUES },
};
static struct virQEMUCapsStringFlags virQEMUCapsDevicePropsVfioPCI[] = {
@@ -1395,6 +1400,7 @@ static struct virQEMUCapsStringFlags
virQEMUCapsDevicePropsVirtioGpu[] = {
{ "disable-legacy", QEMU_CAPS_VIRTIO_PCI_DISABLE_LEGACY },
{ "iommu_platform", QEMU_CAPS_VIRTIO_PCI_IOMMU_PLATFORM },
{ "ats", QEMU_CAPS_VIRTIO_PCI_ATS },
+ { "packed", QEMU_CAPS_VIRTIO_PACKED_QUEUES },
};
static struct virQEMUCapsStringFlags virQEMUCapsDevicePropsICH9[] = {
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index f0961e27..21c09974 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -548,6 +548,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check
*/
QEMU_CAPS_QMP_QUERY_NAMED_BLOCK_NODES_FLAT, /* query-named-block-nodes supports the
'flat' option */
QEMU_CAPS_BLOCKDEV_SNAPSHOT_ALLOW_WRITE_ONLY, /* blockdev-snapshot has the
'allow-write-only-overlay' feature */
QEMU_CAPS_BLOCKDEV_REOPEN, /* 'blockdev-reopen' qmp command is supported
*/
+ QEMU_CAPS_VIRTIO_PACKED_QUEUES, /* virtio packed virtqueue support */
QEMU_CAPS_LAST /* this must always be the last item */
} virQEMUCapsFlags;
diff --git a/tests/qemucapabilitiesdata/caps_4.2.0.aarch64.xml
b/tests/qemucapabilitiesdata/caps_4.2.0.aarch64.xml
index 640ce29c..f1b7fbbe 100644
--- a/tests/qemucapabilitiesdata/caps_4.2.0.aarch64.xml
+++ b/tests/qemucapabilitiesdata/caps_4.2.0.aarch64.xml
@@ -179,6 +179,7 @@
<flag name='rng-builtin'/>
<flag name='virtio-net.failover'/>
<flag name='vhost-user-fs'/>
+ <flag name='virtio.packed'/>
<version>4001050</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>61700242</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml
b/tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml
index 83e804ea..15388967 100644
--- a/tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml
@@ -223,6 +223,7 @@
<flag name='rng-builtin'/>
<flag name='virtio-net.failover'/>
<flag name='vhost-user-fs'/>
+ <flag name='virtio.packed'/>
<version>4002000</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>43100242</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml
b/tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml
index e52c6060..9ef8564a 100644
--- a/tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml
@@ -181,6 +181,7 @@
<flag name='virtio-net.failover'/>
<flag name='cpu.kvm-no-adjvtime'/>
<flag name='vhost-user-fs'/>
+ <flag name='virtio.packed'/>
<version>4002050</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>61700241</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.0.0.ppc64.xml
b/tests/qemucapabilitiesdata/caps_5.0.0.ppc64.xml
index 85fdb21c..a2d78ac0 100644
--- a/tests/qemucapabilitiesdata/caps_5.0.0.ppc64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.0.0.ppc64.xml
@@ -189,6 +189,7 @@
<flag name='vhost-user-fs'/>
<flag name='query-named-block-nodes.flat'/>
<flag name='blockdev-snapshot.allow-write-only-overlay'/>
+ <flag name='virtio.packed'/>
<version>4002050</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>42900241</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
b/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
index d773f7e3..b6a6b3be 100644
--- a/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
@@ -226,6 +226,7 @@
<flag name='vhost-user-fs'/>
<flag name='query-named-block-nodes.flat'/>
<flag name='blockdev-snapshot.allow-write-only-overlay'/>
+ <flag name='virtio.packed'/>
<version>4002050</version>
<kvmVersion>0</kvmVersion>
<microcodeVersion>43100241</microcodeVersion>
--
Mit freundlichen Grüßen/Kind regards
Boris Fiuczynski
IBM Deutschland Research & Development GmbH
Vorsitzender des Aufsichtsrats: Gregor Pillen
Geschäftsführung: Dirk Wittkopp
Sitz der Gesellschaft: Böblingen
Registergericht: Amtsgericht Stuttgart, HRB 243294
10:48 a.m.
New subject: [PATCH 1/4] qemu: capabilities: add 'packed' capability
On a Thursday in 2020, Bjoern Walk wrote:
Add the capability for QEMU's packed virtqueues for virtio that
supposedly have
better cache utilization and performance compared to the default split queues.
Signed-off-by: Bjoern Walk <bwalk(a)linux.ibm.com>
---
src/qemu/qemu_capabilities.c | 6 ++++++
src/qemu/qemu_capabilities.h | 1 +
tests/qemucapabilitiesdata/caps_4.2.0.aarch64.xml | 1 +
tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml | 1 +
tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml | 1 +
tests/qemucapabilitiesdata/caps_5.0.0.ppc64.xml | 1 +
tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml | 1 +
7 files changed, 12 insertions(+)
Reviewed-by: Ján Tomko <jtomko(a)redhat.com>
Jano
5:32 a.m.
New subject: [PATCH 2/4] conf: domain: support for virtio packed option
Expose the virtio parameter for packed virtqueues as a optional libvirt XML
attribute to virtio-backed devices, e.g.:
<interface type='user'>
<mac address='00:11:22:33:44:55'/>
<model type='virtio'/>
<driver packed='on'/>
</interface>
If the attribute is omitted, the default value for this attribute is 'off' and
regular split virtqueues are used.
Reviewed-by: Boris Fiuczynski <fiuczy(a)linux.ibm.com>
Signed-off-by: Bjoern Walk <bwalk(a)linux.ibm.com>
---
docs/schemas/domaincommon.rng | 5 +++++
src/conf/domain_conf.c | 28 ++++++++++++++++++++++++++++
src/conf/domain_conf.h | 1 +
3 files changed, 34 insertions(+)
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index d79dee65..b6d7297b 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -5921,6 +5921,11 @@
<ref name="virOnOff"/>
</attribute>
</optional>
+ <optional>
+ <attribute name="packed">
+ <ref name="virOnOff"/>
+ </attribute>
+ </optional>
</define>
<define name="usbmaster">
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 27bc5a79..ca45a6a5 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -1505,6 +1505,16 @@ virDomainVirtioOptionsParseXML(xmlNodePtr driver,
}
res->ats = val;
}
+ VIR_FREE(str);
+
+ if ((str = virXMLPropString(driver, "packed"))) {
+ if ((val = virTristateSwitchTypeFromString(str)) <= 0) {
+ virReportError(VIR_ERR_XML_ERROR, "%s",
+ _("invalid packed value"));
+ return -1;
+ }
+ res->packed = val;
+ }
return 0;
}
@@ -5084,6 +5094,12 @@ virDomainCheckVirtioOptions(virDomainVirtioOptionsPtr virtio)
"for virtio devices"));
return -1;
}
+ if (virtio->packed != VIR_TRISTATE_SWITCH_ABSENT) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("packed driver option is only supported "
+ "for virtio devices"));
+ return -1;
+ }
return 0;
}
@@ -7370,6 +7386,10 @@ virDomainVirtioOptionsFormat(virBufferPtr buf,
virBufferAsprintf(buf, " ats='%s'",
virTristateSwitchTypeToString(virtio->ats));
}
+ if (virtio->packed != VIR_TRISTATE_SWITCH_ABSENT) {
+ virBufferAsprintf(buf, " packed='%s'",
+ virTristateSwitchTypeToString(virtio->packed));
+ }
}
@@ -22392,6 +22412,14 @@ virDomainVirtioOptionsCheckABIStability(virDomainVirtioOptionsPtr
src,
virTristateSwitchTypeToString(src->ats));
return false;
}
+ if (src->packed != dst->packed) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("Target device packed option '%s' does not "
+ "match source '%s'"),
+ virTristateSwitchTypeToString(dst->packed),
+ virTristateSwitchTypeToString(src->packed));
+ return false;
+ }
return true;
}
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 33875d94..ef322593 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -2404,6 +2404,7 @@ struct _virDomainVsockDef {
struct _virDomainVirtioOptions {
virTristateSwitch iommu;
virTristateSwitch ats;
+ virTristateSwitch packed;
};
/*
--
2.24.1
10:49 a.m.
New subject: [PATCH 2/4] conf: domain: support for virtio packed option
On a Thursday in 2020, Bjoern Walk wrote:
Expose the virtio parameter for packed virtqueues as a optional
libvirt XML
s/a optional/an optional/
attribute to virtio-backed devices, e.g.:
<interface type='user'>
<mac address='00:11:22:33:44:55'/>
<model type='virtio'/>
<driver packed='on'/>
</interface>
If the attribute is omitted, the default value for this attribute is 'off' and
regular split virtqueues are used.
Reviewed-by: Boris Fiuczynski <fiuczy(a)linux.ibm.com>
Signed-off-by: Bjoern Walk <bwalk(a)linux.ibm.com>
---
docs/schemas/domaincommon.rng | 5 +++++
src/conf/domain_conf.c | 28 ++++++++++++++++++++++++++++
src/conf/domain_conf.h | 1 +
3 files changed, 34 insertions(+)
Reviewed-by: Ján Tomko <jtomko(a)redhat.com>
Jano
5:32 a.m.
New subject: [PATCH 3/4] qemu: command: support for virtio packed option
Pass the packed option on the QEMU command line of the capability for
packed virtqueues is detected and the parameter is set explicitly.
Signed-off-by: Bjoern Walk <bwalk(a)linux.ibm.com>
---
src/qemu/qemu_command.c | 10 +++++++
tests/qemuxml2argvdata/virtio-options.args | 32 ++++++++++++----------
tests/qemuxml2argvdata/virtio-options.xml | 26 +++++++++---------
tests/qemuxml2argvtest.c | 3 +-
tests/qemuxml2xmltest.c | 3 +-
5 files changed, 44 insertions(+), 30 deletions(-)
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index d1b689df..81f089ba 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -614,6 +614,16 @@ qemuBuildVirtioOptionsStr(virBufferPtr buf,
virBufferAsprintf(buf, ",ats=%s",
virTristateSwitchTypeToString(virtio->ats));
}
+ if (virtio->packed != VIR_TRISTATE_SWITCH_ABSENT) {
+ if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_VIRTIO_PACKED_QUEUES)) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("the packed setting is not supported with this "
+ "QEMU binary"));
+ return -1;
+ }
+ virBufferAsprintf(buf, ",packed=%s",
+ virTristateSwitchTypeToString(virtio->packed));
+ }
return 0;
}
diff --git a/tests/qemuxml2argvdata/virtio-options.args
b/tests/qemuxml2argvdata/virtio-options.args
index 33ecd8f4..8253a788 100644
--- a/tests/qemuxml2argvdata/virtio-options.args
+++ b/tests/qemuxml2argvdata/virtio-options.args
@@ -24,36 +24,38 @@ server,nowait \
-rtc base=utc \
-no-shutdown \
-no-acpi \
--device virtio-scsi-pci,iommu_platform=on,ats=on,id=scsi0,bus=pci.0,addr=0x8 \
--device virtio-serial-pci,id=virtio-serial0,iommu_platform=on,ats=on,bus=pci.0,\
-addr=0x9 \
+-device virtio-scsi-pci,iommu_platform=on,ats=on,packed=on,id=scsi0,bus=pci.0,\
+addr=0x8 \
+-device virtio-serial-pci,id=virtio-serial0,iommu_platform=on,ats=on,packed=on,\
+bus=pci.0,addr=0x9 \
-usb \
-drive file=/var/lib/libvirt/images/img1,format=raw,if=none,\
id=drive-virtio-disk0 \
--device virtio-blk-pci,iommu_platform=on,ats=on,bus=pci.0,addr=0xa,\
+-device virtio-blk-pci,iommu_platform=on,ats=on,packed=on,bus=pci.0,addr=0xa,\
drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 \
-fsdev local,security_model=passthrough,id=fsdev-fs0,path=/export/fs1 \
-device virtio-9p-pci,id=fs0,fsdev=fsdev-fs0,mount_tag=fs1,iommu_platform=on,\
-ats=on,bus=pci.0,addr=0x3 \
+ats=on,packed=on,bus=pci.0,addr=0x3 \
-fsdev local,security_model=mapped,writeout=immediate,id=fsdev-fs1,\
path=/export/fs2 \
-device virtio-9p-pci,id=fs1,fsdev=fsdev-fs1,mount_tag=fs2,iommu_platform=on,\
-ats=on,bus=pci.0,addr=0x4 \
+ats=on,packed=on,bus=pci.0,addr=0x4 \
-netdev user,id=hostnet0 \
-device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:56:58:5a:5c,bus=pci.0,\
-addr=0x6,iommu_platform=on,ats=on \
--device virtio-mouse-pci,id=input0,bus=pci.0,addr=0xe,iommu_platform=on,ats=on \
+addr=0x6,iommu_platform=on,ats=on,packed=on \
+-device virtio-mouse-pci,id=input0,bus=pci.0,addr=0xe,iommu_platform=on,ats=on,\
+packed=on \
-device virtio-keyboard-pci,id=input1,bus=pci.0,addr=0x10,iommu_platform=on,\
-ats=on \
+ats=on,packed=on \
-device virtio-tablet-pci,id=input2,bus=pci.0,addr=0x11,iommu_platform=on,\
-ats=on \
+ats=on,packed=on \
-device virtio-input-host-pci,id=input3,evdev=/dev/input/event1234,bus=pci.0,\
-addr=0x12,iommu_platform=on,ats=on \
+addr=0x12,iommu_platform=on,ats=on,packed=on \
-chardev socket,id=chr-vu-video0,fd=1729 \
-device vhost-user-gpu-pci,id=video0,max_outputs=1,chardev=chr-vu-video0,\
-bus=pci.0,addr=0x2,iommu_platform=on,ats=on \
+bus=pci.0,addr=0x2,iommu_platform=on,ats=on,packed=on \
-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0xc,iommu_platform=on,\
-ats=on \
+ats=on,packed=on \
-object rng-random,id=objrng0,filename=/dev/random \
--device virtio-rng-pci,rng=objrng0,id=rng0,iommu_platform=on,ats=on,bus=pci.0,\
-addr=0xd
+-device virtio-rng-pci,rng=objrng0,id=rng0,iommu_platform=on,ats=on,packed=on,\
+bus=pci.0,addr=0xd
diff --git a/tests/qemuxml2argvdata/virtio-options.xml
b/tests/qemuxml2argvdata/virtio-options.xml
index dd9a4f4a..3ca27840 100644
--- a/tests/qemuxml2argvdata/virtio-options.xml
+++ b/tests/qemuxml2argvdata/virtio-options.xml
@@ -15,7 +15,7 @@
<devices>
<emulator>/usr/bin/qemu-system-x86_64</emulator>
<disk type='file' device='disk'>
- <driver name='qemu' type='raw' iommu='on'
ats='on'/>
+ <driver name='qemu' type='raw' iommu='on'
ats='on' packed='on'/>
<source file='/var/lib/libvirt/images/img1'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x0a' function='0x0'/>
@@ -27,22 +27,22 @@
<address type='pci' domain='0x0000' bus='0x00'
slot='0x01' function='0x1'/>
</controller>
<controller type='scsi' index='0' model='virtio-scsi'>
- <driver iommu='on' ats='on'/>
+ <driver iommu='on' ats='on' packed='on'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x08' function='0x0'/>
</controller>
<controller type='pci' index='0' model='pci-root'/>
<controller type='virtio-serial' index='0'>
- <driver iommu='on' ats='on'/>
+ <driver iommu='on' ats='on' packed='on'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x09' function='0x0'/>
</controller>
<filesystem type='mount' accessmode='passthrough'>
- <driver iommu='on' ats='on'/>
+ <driver iommu='on' ats='on' packed='on'/>
<source dir='/export/fs1'/>
<target dir='fs1'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x03' function='0x0'/>
</filesystem>
<filesystem type='mount' accessmode='mapped'>
- <driver type='path' wrpolicy='immediate' iommu='on'
ats='on'/>
+ <driver type='path' wrpolicy='immediate' iommu='on'
ats='on' packed='on'/>
<source dir='/export/fs2'/>
<target dir='fs2'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x04' function='0x0'/>
@@ -50,30 +50,30 @@
<interface type='user'>
<mac address='52:54:56:58:5a:5c'/>
<model type='virtio'/>
- <driver iommu='on' ats='on'/>
+ <driver iommu='on' ats='on' packed='on'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x06' function='0x0'/>
</interface>
<input type='mouse' bus='virtio'>
- <driver iommu='on' ats='on'/>
+ <driver iommu='on' ats='on' packed='on'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x0e' function='0x0'/>
</input>
<input type='keyboard' bus='virtio'>
- <driver iommu='on' ats='on'/>
+ <driver iommu='on' ats='on' packed='on'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x10' function='0x0'/>
</input>
<input type='tablet' bus='virtio'>
- <driver iommu='on' ats='on'/>
+ <driver iommu='on' ats='on' packed='on'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x11' function='0x0'/>
</input>
<input type='passthrough' bus='virtio'>
- <driver iommu='on' ats='on'/>
+ <driver iommu='on' ats='on' packed='on'/>
<source evdev='/dev/input/event1234'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x12' function='0x0'/>
</input>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<video>
- <driver iommu='on' ats='on' name='vhostuser'/>
+ <driver iommu='on' ats='on' packed='on'
name='vhostuser'/>
<model type='virtio' heads='1' primary='yes'>
<acceleration accel3d='yes' rendernode='/dev/dri/test'/>
</model>
@@ -81,11 +81,11 @@
</video>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x0c' function='0x0'/>
- <driver iommu='on' ats='on'/>
+ <driver iommu='on' ats='on' packed='on'/>
</memballoon>
<rng model='virtio'>
<backend model='random'>/dev/random</backend>
- <driver iommu='on' ats='on'/>
+ <driver iommu='on' ats='on' packed='on'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x0d' function='0x0'/>
</rng>
</devices>
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index 4d44286b..f66c9854 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -2987,7 +2987,8 @@ mymain(void)
QEMU_CAPS_OBJECT_RNG_RANDOM,
QEMU_CAPS_DEVICE_VIDEO_PRIMARY,
QEMU_CAPS_VIRTIO_PCI_IOMMU_PLATFORM,
- QEMU_CAPS_VIRTIO_PCI_ATS);
+ QEMU_CAPS_VIRTIO_PCI_ATS,
+ QEMU_CAPS_VIRTIO_PACKED_QUEUES);
DO_TEST("fd-memory-numa-topology", QEMU_CAPS_OBJECT_MEMORY_FILE,
QEMU_CAPS_KVM);
diff --git a/tests/qemuxml2xmltest.c b/tests/qemuxml2xmltest.c
index a3c25b4a..5675957d 100644
--- a/tests/qemuxml2xmltest.c
+++ b/tests/qemuxml2xmltest.c
@@ -1289,7 +1289,8 @@ mymain(void)
QEMU_CAPS_DEVICE_VIDEO_PRIMARY,
QEMU_CAPS_VIRTIO_PCI_IOMMU_PLATFORM,
QEMU_CAPS_VIRTIO_PCI_ATS,
- QEMU_CAPS_DEVICE_VHOST_USER_GPU);
+ QEMU_CAPS_DEVICE_VHOST_USER_GPU,
+ QEMU_CAPS_VIRTIO_PACKED_QUEUES);
DO_TEST("fd-memory-numa-topology", QEMU_CAPS_OBJECT_MEMORY_FILE,
QEMU_CAPS_KVM);
--
2.24.1
8:28 a.m.
New subject: [PATCH 3/4] qemu: command: support for virtio packed option
Looks sane as well
Reviewed-by: Boris Fiuczynski <fiuczy(a)linux.ibm.com>
On 3/26/20 11:32 AM, Bjoern Walk wrote:
Pass the packed option on the QEMU command line of the capability
for
packed virtqueues is detected and the parameter is set explicitly.
Signed-off-by: Bjoern Walk <bwalk(a)linux.ibm.com>
---
src/qemu/qemu_command.c | 10 +++++++
tests/qemuxml2argvdata/virtio-options.args | 32 ++++++++++++----------
tests/qemuxml2argvdata/virtio-options.xml | 26 +++++++++---------
tests/qemuxml2argvtest.c | 3 +-
tests/qemuxml2xmltest.c | 3 +-
5 files changed, 44 insertions(+), 30 deletions(-)
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index d1b689df..81f089ba 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -614,6 +614,16 @@ qemuBuildVirtioOptionsStr(virBufferPtr buf,
virBufferAsprintf(buf, ",ats=%s",
virTristateSwitchTypeToString(virtio->ats));
}
+ if (virtio->packed != VIR_TRISTATE_SWITCH_ABSENT) {
+ if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_VIRTIO_PACKED_QUEUES)) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("the packed setting is not supported with this "
+ "QEMU binary"));
+ return -1;
+ }
+ virBufferAsprintf(buf, ",packed=%s",
+ virTristateSwitchTypeToString(virtio->packed));
+ }
return 0;
}
diff --git a/tests/qemuxml2argvdata/virtio-options.args
b/tests/qemuxml2argvdata/virtio-options.args
index 33ecd8f4..8253a788 100644
--- a/tests/qemuxml2argvdata/virtio-options.args
+++ b/tests/qemuxml2argvdata/virtio-options.args
@@ -24,36 +24,38 @@ server,nowait \
-rtc base=utc \
-no-shutdown \
-no-acpi \
--device virtio-scsi-pci,iommu_platform=on,ats=on,id=scsi0,bus=pci.0,addr=0x8 \
--device virtio-serial-pci,id=virtio-serial0,iommu_platform=on,ats=on,bus=pci.0,\
-addr=0x9 \
+-device virtio-scsi-pci,iommu_platform=on,ats=on,packed=on,id=scsi0,bus=pci.0,\
+addr=0x8 \
+-device virtio-serial-pci,id=virtio-serial0,iommu_platform=on,ats=on,packed=on,\
+bus=pci.0,addr=0x9 \
-usb \
-drive file=/var/lib/libvirt/images/img1,format=raw,if=none,\
id=drive-virtio-disk0 \
--device virtio-blk-pci,iommu_platform=on,ats=on,bus=pci.0,addr=0xa,\
+-device virtio-blk-pci,iommu_platform=on,ats=on,packed=on,bus=pci.0,addr=0xa,\
drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 \
-fsdev local,security_model=passthrough,id=fsdev-fs0,path=/export/fs1 \
-device virtio-9p-pci,id=fs0,fsdev=fsdev-fs0,mount_tag=fs1,iommu_platform=on,\
-ats=on,bus=pci.0,addr=0x3 \
+ats=on,packed=on,bus=pci.0,addr=0x3 \
-fsdev local,security_model=mapped,writeout=immediate,id=fsdev-fs1,\
path=/export/fs2 \
-device virtio-9p-pci,id=fs1,fsdev=fsdev-fs1,mount_tag=fs2,iommu_platform=on,\
-ats=on,bus=pci.0,addr=0x4 \
+ats=on,packed=on,bus=pci.0,addr=0x4 \
-netdev user,id=hostnet0 \
-device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:56:58:5a:5c,bus=pci.0,\
-addr=0x6,iommu_platform=on,ats=on \
--device virtio-mouse-pci,id=input0,bus=pci.0,addr=0xe,iommu_platform=on,ats=on \
+addr=0x6,iommu_platform=on,ats=on,packed=on \
+-device virtio-mouse-pci,id=input0,bus=pci.0,addr=0xe,iommu_platform=on,ats=on,\
+packed=on \
-device virtio-keyboard-pci,id=input1,bus=pci.0,addr=0x10,iommu_platform=on,\
-ats=on \
+ats=on,packed=on \
-device virtio-tablet-pci,id=input2,bus=pci.0,addr=0x11,iommu_platform=on,\
-ats=on \
+ats=on,packed=on \
-device virtio-input-host-pci,id=input3,evdev=/dev/input/event1234,bus=pci.0,\
-addr=0x12,iommu_platform=on,ats=on \
+addr=0x12,iommu_platform=on,ats=on,packed=on \
-chardev socket,id=chr-vu-video0,fd=1729 \
-device vhost-user-gpu-pci,id=video0,max_outputs=1,chardev=chr-vu-video0,\
-bus=pci.0,addr=0x2,iommu_platform=on,ats=on \
+bus=pci.0,addr=0x2,iommu_platform=on,ats=on,packed=on \
-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0xc,iommu_platform=on,\
-ats=on \
+ats=on,packed=on \
-object rng-random,id=objrng0,filename=/dev/random \
--device virtio-rng-pci,rng=objrng0,id=rng0,iommu_platform=on,ats=on,bus=pci.0,\
-addr=0xd
+-device virtio-rng-pci,rng=objrng0,id=rng0,iommu_platform=on,ats=on,packed=on,\
+bus=pci.0,addr=0xd
diff --git a/tests/qemuxml2argvdata/virtio-options.xml
b/tests/qemuxml2argvdata/virtio-options.xml
index dd9a4f4a..3ca27840 100644
--- a/tests/qemuxml2argvdata/virtio-options.xml
+++ b/tests/qemuxml2argvdata/virtio-options.xml
@@ -15,7 +15,7 @@
<devices>
<emulator>/usr/bin/qemu-system-x86_64</emulator>
<disk type='file' device='disk'>
- <driver name='qemu' type='raw' iommu='on'
ats='on'/>
+ <driver name='qemu' type='raw' iommu='on'
ats='on' packed='on'/>
<source file='/var/lib/libvirt/images/img1'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x0a' function='0x0'/>
@@ -27,22 +27,22 @@
<address type='pci' domain='0x0000' bus='0x00'
slot='0x01' function='0x1'/>
</controller>
<controller type='scsi' index='0'
model='virtio-scsi'>
- <driver iommu='on' ats='on'/>
+ <driver iommu='on' ats='on' packed='on'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x08' function='0x0'/>
</controller>
<controller type='pci' index='0' model='pci-root'/>
<controller type='virtio-serial' index='0'>
- <driver iommu='on' ats='on'/>
+ <driver iommu='on' ats='on' packed='on'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x09' function='0x0'/>
</controller>
<filesystem type='mount' accessmode='passthrough'>
- <driver iommu='on' ats='on'/>
+ <driver iommu='on' ats='on' packed='on'/>
<source dir='/export/fs1'/>
<target dir='fs1'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x03' function='0x0'/>
</filesystem>
<filesystem type='mount' accessmode='mapped'>
- <driver type='path' wrpolicy='immediate' iommu='on'
ats='on'/>
+ <driver type='path' wrpolicy='immediate' iommu='on'
ats='on' packed='on'/>
<source dir='/export/fs2'/>
<target dir='fs2'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x04' function='0x0'/>
@@ -50,30 +50,30 @@
<interface type='user'>
<mac address='52:54:56:58:5a:5c'/>
<model type='virtio'/>
- <driver iommu='on' ats='on'/>
+ <driver iommu='on' ats='on' packed='on'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x06' function='0x0'/>
</interface>
<input type='mouse' bus='virtio'>
- <driver iommu='on' ats='on'/>
+ <driver iommu='on' ats='on' packed='on'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x0e' function='0x0'/>
</input>
<input type='keyboard' bus='virtio'>
- <driver iommu='on' ats='on'/>
+ <driver iommu='on' ats='on' packed='on'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x10' function='0x0'/>
</input>
<input type='tablet' bus='virtio'>
- <driver iommu='on' ats='on'/>
+ <driver iommu='on' ats='on' packed='on'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x11' function='0x0'/>
</input>
<input type='passthrough' bus='virtio'>
- <driver iommu='on' ats='on'/>
+ <driver iommu='on' ats='on' packed='on'/>
<source evdev='/dev/input/event1234'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x12' function='0x0'/>
</input>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<video>
- <driver iommu='on' ats='on' name='vhostuser'/>
+ <driver iommu='on' ats='on' packed='on'
name='vhostuser'/>
<model type='virtio' heads='1' primary='yes'>
<acceleration accel3d='yes' rendernode='/dev/dri/test'/>
</model>
@@ -81,11 +81,11 @@
</video>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x0c' function='0x0'/>
- <driver iommu='on' ats='on'/>
+ <driver iommu='on' ats='on' packed='on'/>
</memballoon>
<rng model='virtio'>
<backend model='random'>/dev/random</backend>
- <driver iommu='on' ats='on'/>
+ <driver iommu='on' ats='on' packed='on'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x0d' function='0x0'/>
</rng>
</devices>
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index 4d44286b..f66c9854 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -2987,7 +2987,8 @@ mymain(void)
QEMU_CAPS_OBJECT_RNG_RANDOM,
QEMU_CAPS_DEVICE_VIDEO_PRIMARY,
QEMU_CAPS_VIRTIO_PCI_IOMMU_PLATFORM,
- QEMU_CAPS_VIRTIO_PCI_ATS);
+ QEMU_CAPS_VIRTIO_PCI_ATS,
+ QEMU_CAPS_VIRTIO_PACKED_QUEUES);
DO_TEST("fd-memory-numa-topology", QEMU_CAPS_OBJECT_MEMORY_FILE,
QEMU_CAPS_KVM);
diff --git a/tests/qemuxml2xmltest.c b/tests/qemuxml2xmltest.c
index a3c25b4a..5675957d 100644
--- a/tests/qemuxml2xmltest.c
+++ b/tests/qemuxml2xmltest.c
@@ -1289,7 +1289,8 @@ mymain(void)
QEMU_CAPS_DEVICE_VIDEO_PRIMARY,
QEMU_CAPS_VIRTIO_PCI_IOMMU_PLATFORM,
QEMU_CAPS_VIRTIO_PCI_ATS,
- QEMU_CAPS_DEVICE_VHOST_USER_GPU);
+ QEMU_CAPS_DEVICE_VHOST_USER_GPU,
+ QEMU_CAPS_VIRTIO_PACKED_QUEUES);
DO_TEST("fd-memory-numa-topology", QEMU_CAPS_OBJECT_MEMORY_FILE,
QEMU_CAPS_KVM);
--
Mit freundlichen Grüßen/Kind regards
Boris Fiuczynski
IBM Deutschland Research & Development GmbH
Vorsitzender des Aufsichtsrats: Gregor Pillen
Geschäftsführung: Dirk Wittkopp
Sitz der Gesellschaft: Böblingen
Registergericht: Amtsgericht Stuttgart, HRB 243294
10:49 a.m.
New subject: [PATCH 3/4] qemu: command: support for virtio packed option
On a Thursday in 2020, Bjoern Walk wrote:
Pass the packed option on the QEMU command line of the capability for
packed virtqueues is detected and the parameter is set explicitly.
Signed-off-by: Bjoern Walk <bwalk(a)linux.ibm.com>
---
src/qemu/qemu_command.c | 10 +++++++
tests/qemuxml2argvdata/virtio-options.args | 32 ++++++++++++----------
tests/qemuxml2argvdata/virtio-options.xml | 26 +++++++++---------
tests/qemuxml2argvtest.c | 3 +-
tests/qemuxml2xmltest.c | 3 +-
5 files changed, 44 insertions(+), 30 deletions(-)
Reviewed-by: Ján Tomko <jtomko(a)redhat.com>
Jano
5:32 a.m.
New subject: [PATCH 4/4] docs: documentation for virtio packed option
Reviewed-by: Boris Fiuczynski <fiuczy(a)linux.ibm.com>
Signed-off-by: Bjoern Walk <bwalk(a)linux.ibm.com>
---
docs/formatdomain.html.in | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index fb07d107..f8bfef7d 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -4321,6 +4321,14 @@
Possible values are <code>on</code> or <code>off</code>.
<span class="since">Since 3.5.0</span>
</p>
+ <p>
+ The attribute <code>packed</code> controls the usage of packed
+ virtqueues. Compared to regular split queues, packed queues consist of
+ only a single descriptor ring replacing available and used ring, index
+ and descriptor buffer. This can result in better cache utilization and
+ performance. Possible values are <code>on</code> or
<code>off</code>.
+ <span class="since">Since 6.3.0 (QEMU and KVM only)</span>
+ </p>
<h4><a id="elementsVirtioTransitional">Virtio transitional
devices</a></h4>
--
2.24.1
8:08 p.m.
New subject: [PATCH 4/4] docs: documentation for virtio packed option
On Thu, 26 Mar 2020 11:32:14 +0100
Bjoern Walk <bwalk(a)linux.ibm.com> wrote:
+ <p>
+ The attribute <code>packed</code> controls the usage of packed
+ virtqueues.
This reads to me, like if packed='on' is specified, then packed
virtqueues are used (or the device fails); if packed='off' is specified
is specified then split virtqueue format is used.
But that statement is not always true. One might still end up using
split despite of packed='on'. One example is a setup vhost-net setup.
The in kernel implementation namely does not support packed queues, so
F_RING_PACKED does not get offered by the device.
Another reason why one could end up with F_RING_PACKED not getting
negotiated is lack of guest support.
Please note that this behavior is a little different than what we do for
cpus (and cpu models). There one either gets what he asked for, or the
VM won't get constructed.
I believe, we should at least document this cleanly. Cc-ing Michael
and Jason as hypervisor experts on these topics.
Regards,
Halil
Compared to regular split queues, packed queues consist of
+ only a single descriptor ring replacing available and used ring, index
+ and descriptor buffer. This can result in better cache utilization and
+ performance. Possible values are <code>on</code> or
<code>off</code>.
+ <span class="since">Since 6.3.0 (QEMU and KVM only)</span>
+ </p>
8:55 p.m.
New subject: [PATCH 4/4] docs: documentation for virtio packed option
On 2020/3/27 上午9:08, Halil Pasic wrote:
On Thu, 26 Mar 2020 11:32:14 +0100
Bjoern Walk <bwalk(a)linux.ibm.com> wrote:
> + <p>
> + The attribute <code>packed</code> controls the usage of packed
> + virtqueues.
This reads to me, like if packed='on' is specified, then packed
virtqueues are used (or the device fails); if packed='off' is specified
is specified then split virtqueue format is used.
But that statement is not always true. One might still end up using
split despite of packed='on'. One example is a setup vhost-net setup.
The in kernel implementation namely does not support packed queues, so
F_RING_PACKED does not get offered by the device.
Another reason why one could end up with F_RING_PACKED not getting
negotiated is lack of guest support.
Please note that this behavior is a little different than what we do for
cpus (and cpu models). There one either gets what he asked for, or the
VM won't get constructed.
I believe, we should at least document this cleanly. Cc-ing Michael
and Jason as hypervisor experts on these topics.
Regards,
Halil
I think we need document that packed=on only enable the qemu support of
packed ring, but whether it is actually enabled depends on the feature
negotiation between qemu, vhost backends and guest drivers.
Thanks
> Compared to regular split queues, packed queues consist of
> + only a single descriptor ring replacing available and used ring, index
> + and descriptor buffer. This can result in better cache utilization and
> + performance. Possible values are <code>on</code> or
<code>off</code>.
> + <span class="since">Since 6.3.0 (QEMU and KVM
only)</span>
> + </p>
5:11 a.m.
New subject: [PATCH 4/4] docs: documentation for virtio packed option
On Fri, Mar 27, 2020 at 02:08:48AM +0100, Halil Pasic wrote:
On Thu, 26 Mar 2020 11:32:14 +0100
Bjoern Walk <bwalk(a)linux.ibm.com> wrote:
> + <p>
> + The attribute <code>packed</code> controls the usage of packed
> + virtqueues.
This reads to me, like if packed='on' is specified, then packed
virtqueues are used (or the device fails); if packed='off' is specified
is specified then split virtqueue format is used.
But that statement is not always true. One might still end up using
split despite of packed='on'. One example is a setup vhost-net setup.
The in kernel implementation namely does not support packed queues, so
F_RING_PACKED does not get offered by the device.
Another reason why one could end up with F_RING_PACKED not getting
negotiated is lack of guest support.
Please note that this behavior is a little different than what we do for
cpus (and cpu models). There one either gets what he asked for, or the
VM won't get constructed.
I believe, we should at least document this cleanly. Cc-ing Michael
and Jason as hypervisor experts on these topics.
Regards,
Halil
Note that it's not very different from e.g. event index.
It can't hurt to mention that this flag only affects QEMU
as Jason suggested.
> Compared to regular split queues, packed queues consist of
> + only a single descriptor ring replacing available and used ring, index
> + and descriptor buffer. This can result in better cache utilization and
> + performance. Possible values are <code>on</code> or
<code>off</code>.
> + <span class="since">Since 6.3.0 (QEMU and KVM
only)</span>
> + </p>
1694
days inactive
1702
days old
13 comments
6 participants
participants (6)
-
Bjoern Walk -
Boris Fiuczynski -
Halil Pasic -
Jason Wang -
Ján Tomko -
Michael S. Tsirkin