Re: [PATCHv3 5/6] conf: add caching attribute to iommu device

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On 04/26/2017 04:29 AM, Ján Tomko wrote:
> 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.xml           | 50 ++++++++++++++++++++++
>  .../qemuxml2xmlout-intel-iommu-caching.xml         |  1 +
>  tests/qemuxml2xmltest.c                            |  1 +
>  7 files changed, 88 insertions(+), 3 deletions(-)
>  create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-intel-iommu-caching.xml
>  create mode 120000 tests/qemuxml2xmloutdata/qemuxml2xmlout-intel-iommu-caching.xml
> 
> diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
> index e1a4625..266b16e 100644
> --- a/docs/formatdomain.html.in
> +++ b/docs/formatdomain.html.in
> @@ -7391,6 +7391,15 @@ qemu-kvm -net nic,model=? /dev/null
>                (QEMU only)
>              </p>
>            </dd>
> +          <dt><code>caching</code></dt>
> +          <dd>
> +            <p>
> +              The <code>caching</code> attribute with possible values
> +              <code>on</code> and <code>off</code> can be used to
> +              turn on the caching mode. <span class="since">Since 3.3.0</span>
> +              (QEMU only)


IDC whether it's caching or caching-mode which Peter both suggests and
says is misleading.

Still indicating that this is what's used in order to enable VT-d might
give a consumer/reader a chance to know what feature this is related to.

I'm fine with the code - it's just the documentation that's bothering
me. The capabilities code will need some obvious merging with current
git head, but that's mundane. I'm OOO on Mon/Tue BTW, so a review from
me of any followup would need to wait or you could twist someone else's
ARM ;-)

John


> +            </p>
> +          </dd>
>          </dl>
>        </dd>
>      </dl>
> diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
> index cc10209..74cd863 100644
> --- a/docs/schemas/domaincommon.rng
> +++ b/docs/schemas/domaincommon.rng
> @@ -3899,6 +3899,11 @@
>                <ref name="virOnOff"/>
>              </attribute>
>            </optional>
> +          <optional>
> +            <attribute name="caching">
> +              <ref name="virOnOff"/>
> +            </attribute>
> +          </optional>
>          </element>
>        </optional>
>      </element>
> diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
> index 650d206..6c696c8 100644
> --- a/src/conf/domain_conf.c
> +++ b/src/conf/domain_conf.c
> @@ -14171,6 +14171,15 @@ virDomainIOMMUDefParseXML(xmlNodePtr node,
>          iommu->intremap = val;
>      }
>  
> +    VIR_FREE(tmp);
> +    if ((tmp = virXPathString("string(./driver/@caching)", ctxt))) {
> +        if ((val = virTristateSwitchTypeFromString(tmp)) < 0) {
> +            virReportError(VIR_ERR_XML_ERROR, _("unknown caching value: %s"), tmp);
> +            goto cleanup;
> +        }
> +        iommu->caching = val;
> +    }
> +
>      ret = iommu;
>      iommu = NULL;
>  
> @@ -24118,9 +24127,18 @@ 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 != VIR_TRISTATE_SWITCH_ABSENT) {
> +        virBufferAddLit(&childBuf, "<driver");
> +        if (iommu->intremap) {
> +            virBufferAsprintf(&childBuf, " intremap='%s'",
> +                              virTristateSwitchTypeToString(iommu->intremap));
> +        }
> +        if (iommu->caching != VIR_TRISTATE_SWITCH_ABSENT) {
> +            virBufferAsprintf(&childBuf, " caching='%s'",
> +                              virTristateSwitchTypeToString(iommu->caching));
> +        }
> +        virBufferAddLit(&childBuf, "/>\n");
>      }
>  
>      virBufferAsprintf(buf, "<iommu model='%s'",
> diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
> index 61f18cf..97c9356 100644
> --- a/src/conf/domain_conf.h
> +++ b/src/conf/domain_conf.h
> @@ -2214,6 +2214,7 @@ typedef enum {
>  struct _virDomainIOMMUDef {
>      virDomainIOMMUModel model;
>      virTristateSwitch intremap;
> +    virTristateSwitch caching;
>  };
>  /*
>   * Guest VM main configuration
> diff --git a/tests/qemuxml2argvdata/qemuxml2argv-intel-iommu-caching.xml b/tests/qemuxml2argvdata/qemuxml2argv-intel-iommu-caching.xml
> new file mode 100644
> index 0000000..8261d5a
> --- /dev/null
> +++ b/tests/qemuxml2argvdata/qemuxml2argv-intel-iommu-caching.xml
> @@ -0,0 +1,50 @@
> +<domain type='qemu'>
> +  <name>QEMUGuest1</name>
> +  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
> +  <memory unit='KiB'>219100</memory>
> +  <currentMemory unit='KiB'>219100</currentMemory>
> +  <vcpu placement='static'>1</vcpu>
> +  <os>
> +    <type arch='x86_64' machine='q35'>hvm</type>
> +    <boot dev='hd'/>
> +  </os>
> +  <clock offset='utc'/>
> +  <on_poweroff>destroy</on_poweroff>
> +  <on_reboot>restart</on_reboot>
> +  <on_crash>destroy</on_crash>
> +  <devices>
> +    <emulator>/usr/bin/qemu-system-x86_64</emulator>
> +    <controller type='pci' index='0' model='pcie-root'/>
> +    <controller type='pci' index='1' model='dmi-to-pci-bridge'>
> +      <model name='i82801b11-bridge'/>
> +      <address type='pci' domain='0x0000' bus='0x00' slot='0x1e' function='0x0'/>
> +    </controller>
> +    <controller type='pci' index='2' model='pci-bridge'>
> +      <model name='pci-bridge'/>
> +      <target chassisNr='2'/>
> +      <address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
> +    </controller>
> +    <controller type='pci' index='3' model='pcie-root-port'>
> +      <model name='ioh3420'/>
> +      <target chassis='3' port='0x10'/>
> +      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
> +    </controller>
> +    <controller type='sata' index='0'>
> +      <address type='pci' domain='0x0000' bus='0x00' slot='0x1f' function='0x2'/>
> +    </controller>
> +    <controller type='usb' index='0' model='ich9-ehci1'>
> +      <address type='pci' domain='0x0000' bus='0x02' slot='0x02' function='0x7'/>
> +    </controller>
> +    <interface type='user'>
> +      <mac address='52:54:00:ab:0c:5c'/>
> +      <model type='rtl8139'/>
> +      <address type='pci' domain='0x0000' bus='0x02' slot='0x01' function='0x0'/>
> +    </interface>
> +    <input type='mouse' bus='ps2'/>
> +    <input type='keyboard' bus='ps2'/>
> +    <memballoon model='none'/>
> +    <iommu model='intel'>
> +      <driver intremap='on' caching='on'/>
> +    </iommu>
> +  </devices>
> +</domain>
> diff --git a/tests/qemuxml2xmloutdata/qemuxml2xmlout-intel-iommu-caching.xml b/tests/qemuxml2xmloutdata/qemuxml2xmlout-intel-iommu-caching.xml
> new file mode 120000
> index 0000000..6935d93
> --- /dev/null
> +++ b/tests/qemuxml2xmloutdata/qemuxml2xmlout-intel-iommu-caching.xml
> @@ -0,0 +1 @@
> +../qemuxml2argvdata/qemuxml2argv-intel-iommu-caching.xml
> \ No newline at end of file
> diff --git a/tests/qemuxml2xmltest.c b/tests/qemuxml2xmltest.c
> index 40425f5..848da4f 100644
> --- a/tests/qemuxml2xmltest.c
> +++ b/tests/qemuxml2xmltest.c
> @@ -1123,6 +1123,7 @@ mymain(void)
>              QEMU_CAPS_MACHINE_OPT,
>              QEMU_CAPS_MACHINE_IOMMU);
>      DO_TEST("intel-iommu-irqchip", NONE);
> +    DO_TEST("intel-iommu-caching", NONE);
>  
>      DO_TEST("cpu-check-none", NONE);
>      DO_TEST("cpu-check-partial", NONE);
> 

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