Re: [libvirt] [PATCHv4 5/6] conf: add caching_mode attribute to iommu device

Add a new attribute to control the caching mode. https://bugzilla.redhat.com/show_bug.cgi?id=1427005 --- docs/formatdomain.html.in | 9 ++++ docs/schemas/domaincommon.rng | 5 +++ src/conf/domain_conf.c | 24 +++++++++-- src/conf/domain_conf.h | 1 + .../qemuxml2argv-intel-iommu-caching-mode.xml | 50 ++++++++++++++++++++++ .../qemuxml2xmlout-intel-iommu-caching-mode.xml | 1 + tests/qemuxml2xmltest.c | 1 + 7 files changed, 88 insertions(+), 3 deletions(-) create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-intel-iommu-caching-mode.xml create mode 120000 tests/qemuxml2xmloutdata/qemuxml2xmlout-intel-iommu-caching-mode.xml diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in index ca98f0e..4552037 100644 --- a/docs/formatdomain.html.in +++ b/docs/formatdomain.html.in @@ -7426,6 +7426,15 @@ qemu-kvm -net nic,model=? /dev/null <span class="since">Since 3.4.0</span> (QEMU/KVM only) </p> </dd> + <dt><code>caching_mode</code></dt> + <dd> + <p> + The <code>caching_mode</code> attribute with possible values + <code>on</code> and <code>off</code> can be used to + turn on the VT-d caching mode (useful for assigned devices)

+ <span class="since">Since 3.4.0</span> (QEMU/KVM only) + </p> + </dd> </dl> </dd> </dl>

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index 4eefd92..ef31f4a 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c @@ -14176,6 +14176,15 @@ virDomainIOMMUDefParseXML(xmlNodePtr node, iommu->intremap = val; } + VIR_FREE(tmp); + if ((tmp = virXPathString("string(./driver/@caching_mode)", ctxt))) { + if ((val = virTristateSwitchTypeFromString(tmp)) < 0) { + virReportError(VIR_ERR_XML_ERROR, _("unknown caching_mode value: %s"), tmp); + goto cleanup; + } + iommu->caching_mode = val; + } + ret = iommu; iommu = NULL; @@ -24143,9 +24152,18 @@ virDomainIOMMUDefFormat(virBufferPtr buf, virBufferAdjustIndent(&childBuf, virBufferGetIndent(buf, false) + 2); - if (iommu->intremap != VIR_TRISTATE_SWITCH_ABSENT) { - virBufferAsprintf(&childBuf, "<driver intremap='%s'/>\n", - virTristateSwitchTypeToString(iommu->intremap)); + if (iommu->intremap != VIR_TRISTATE_SWITCH_ABSENT || + iommu->caching_mode != VIR_TRISTATE_SWITCH_ABSENT) { + virBufferAddLit(&childBuf, "<driver"); + if (iommu->intremap) {

+ virBufferAsprintf(&childBuf, " intremap='%s'", + virTristateSwitchTypeToString(iommu->intremap)); + } + if (iommu->caching_mode != VIR_TRISTATE_SWITCH_ABSENT) { + virBufferAsprintf(&childBuf, " caching_mode='%s'", + virTristateSwitchTypeToString(iommu->caching_mode)); + } + virBufferAddLit(&childBuf, "/>\n"); } virBufferAsprintf(buf, "<iommu model='%s'",