[PATCH v6 3/4] qemu: command: add support for acpi-bridge-hotplug feature
Ani Sinha
ani at anisinha.ca
Fri Oct 8 06:51:21 UTC 2021
On Fri, 8 Oct 2021, Laine Stump wrote:
> On 10/5/21 1:51 AM, Ani Sinha wrote:
> > This change adds backend qemu command line support for new libvirt global
> > feature 'acpi-bridge-hotplug'. This option can be used as following:
> >
> > <feature>
> > <pci>
> > <acpi-bridge-hotplug state='off|on'/>
> > </pci>
> > </feature>
> >
> > The '<pci>' sub-element under '<feature>' is also newly introduced.
> >
> > 'acpi-bridge-hotplug' turns on the following command line option to qemu for
> > x86 guests:
> >
> > (pc machines): -global
> > PIIX4_PM.acpi-pci-hotplug-with-bridge-support=<off|on>
> > (q35 machines): -global
> > ICH9-LPC.acpi-pci-hotplug-with-bridge-support=<off|on>
> >
> > This change also adds the required qemuxml2argv unit tests in order to test
> > correct qemu arguments. Unit tests have also been added to test qemu
> > capability
> > validation checks as well as checks for using this option with the right
> > architecture.
> >
> > Signed-off-by: Ani Sinha <ani at anisinha.ca>
> > ---
> > src/qemu/qemu_command.c | 14 ++++++++
> > .../aarch64-acpi-hotplug-bridge-disable.err | 1 +
> > ...pc-i440fx-acpi-hotplug-bridge-disable.args | 31 +++++++++++++++++
> > .../pc-i440fx-acpi-hotplug-bridge-disable.err | 1 +
> > .../q35-acpi-hotplug-bridge-disable.args | 33 +++++++++++++++++++
> > .../q35-acpi-hotplug-bridge-disable.err | 1 +
> > tests/qemuxml2argvtest.c | 16 +++++++++
> > 7 files changed, 97 insertions(+)
> > create mode 100644
> > tests/qemuxml2argvdata/aarch64-acpi-hotplug-bridge-disable.err
> > create mode 100644
> > tests/qemuxml2argvdata/pc-i440fx-acpi-hotplug-bridge-disable.args
> > create mode 100644
> > tests/qemuxml2argvdata/pc-i440fx-acpi-hotplug-bridge-disable.err
> > create mode 100644
> > tests/qemuxml2argvdata/q35-acpi-hotplug-bridge-disable.args
> > create mode 100644
> > tests/qemuxml2argvdata/q35-acpi-hotplug-bridge-disable.err
> >
> > diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
> > index 08f6d735f8..6c8c99e595 100644
> > --- a/src/qemu/qemu_command.c
> > +++ b/src/qemu/qemu_command.c
> > @@ -6069,6 +6069,7 @@ qemuBuildPMCommandLine(virCommand *cmd,
> > qemuDomainObjPrivate *priv)
> > {
> > virQEMUCaps *qemuCaps = priv->qemuCaps;
> > + int acpihp_br =
> > def->pci_features[(virDomainPCI)VIR_DOMAIN_PCI_ACPI_BRIDGE_HP];
>
>
> I'm not sure why you put the typecast on the array subscript, but it's
> unnecessary. I removed it.
Fixed in v7.
>
>
> > if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_SET_ACTION)) {
> > /* with new qemu we always want '-no-shutdown' on startup and we
> > set
> > @@ -6114,6 +6115,19 @@ qemuBuildPMCommandLine(virCommand *cmd,
> > pm_object, def->pm.s4 ==
> > VIR_TRISTATE_BOOL_NO);
> > }
> > + if (acpihp_br) {
> > + const char *pm_object = "PIIX4_PM";
> > +
> > + if (qemuDomainIsQ35(def) &&
> > + virQEMUCapsGet(qemuCaps, QEMU_CAPS_ICH9_ACPI_HOTPLUG_BRIDGE))
> > + pm_object = "ICH9-LPC";
>
> So on Q35 systems that don't support setting "ICH9-LPC.acpi-pci-hotplug....."
> it will also work to set "PIIX4_PM.acpi-pci-...."? (apparently this is the
> case with the s3 and s4 acpi suspend options, which have a similar hack a few
> lines below this one).
>
> Assuming that is the case, then this patch also seems fine to me
>
No, that is not right. I have fixed it in v7. Thanks for catching it.
> Reviewed-by: Laine Stump <laine at redhat.com>
>
> I may want to make the documentation in formatdomain.rst a bit more clear, but
> I can do that as a separate patch after these (since I know you're leaving on
> a vacation so won't be around to do it).
Yeah I could not handle it well. I tried my best but left the rest to the
experts here :-)
>
> As long as nobody complains about the naming of the feature,
If by naming if you mean the domain xml config options, that is approved
by danpb (offline IRC chat with him).
I think I can
> push this tomorrow evening (U.S. time) (that will give time for any discussion
> about naming in the morning, then I'll have to be afk for a few hours in the
> afternoon.
>
> Thanks for your contribution, and for your perseverance in the face of my
> procrastination, and enjoy your vacation!!
Thanks Laine for so much help. Very much appretiate your suggestions and
guidance here.
>
> > +
> > + virCommandAddArg(cmd, "-global");
> > + virCommandAddArgFormat(cmd,
> > "%s.acpi-pci-hotplug-with-bridge-support=%s",
> > + pm_object,
> > + virTristateSwitchTypeToString(acpihp_br));
> > + }
> > +
> > return 0;
> > }
> > diff --git
> > a/tests/qemuxml2argvdata/aarch64-acpi-hotplug-bridge-disable.err
> > b/tests/qemuxml2argvdata/aarch64-acpi-hotplug-bridge-disable.err
> > new file mode 100644
> > index 0000000000..9f0a88b826
> > --- /dev/null
> > +++ b/tests/qemuxml2argvdata/aarch64-acpi-hotplug-bridge-disable.err
> > @@ -0,0 +1 @@
> > +unsupported configuration: acpi-bridge-hotplug is not available for
> > architecture 'aarch64'
> > diff --git
> > a/tests/qemuxml2argvdata/pc-i440fx-acpi-hotplug-bridge-disable.args
> > b/tests/qemuxml2argvdata/pc-i440fx-acpi-hotplug-bridge-disable.args
> > new file mode 100644
> > index 0000000000..a1e5dc85c7
> > --- /dev/null
> > +++ b/tests/qemuxml2argvdata/pc-i440fx-acpi-hotplug-bridge-disable.args
> > @@ -0,0 +1,31 @@
> > +LC_ALL=C \
> > +PATH=/bin \
> > +HOME=/tmp/lib/domain--1-i440fx \
> > +USER=test \
> > +LOGNAME=test \
> > +XDG_DATA_HOME=/tmp/lib/domain--1-i440fx/.local/share \
> > +XDG_CACHE_HOME=/tmp/lib/domain--1-i440fx/.cache \
> > +XDG_CONFIG_HOME=/tmp/lib/domain--1-i440fx/.config \
> > +QEMU_AUDIO_DRV=none \
> > +/usr/bin/qemu-system-x86_64 \
> > +-name guest=i440fx,debug-threads=on \
> > +-S \
> > +-object
> > secret,id=masterKey0,format=raw,file=/tmp/lib/domain--1-i440fx/master-key.aes
> > \
> > +-machine pc-i440fx-2.5,accel=tcg,usb=off,dump-guest-core=off \
> > +-m 1024 \
> > +-realtime mlock=off \
> > +-smp 1,sockets=1,cores=1,threads=1 \
> > +-uuid 56f5055c-1b8d-490c-844a-ad646a1caaaa \
> > +-display none \
> > +-no-user-config \
> > +-nodefaults \
> > +-chardev
> > socket,id=charmonitor,path=/tmp/lib/domain--1-i440fx/monitor.sock,server=on,wait=off
> > \
> > +-mon chardev=charmonitor,id=monitor,mode=control \
> > +-rtc base=utc \
> > +-no-shutdown \
> > +-no-acpi \
> > +-global PIIX4_PM.acpi-pci-hotplug-with-bridge-support=off \
> > +-boot strict=on \
> > +-usb \
> > +-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x2 \
> > +-msg timestamp=on
> > diff --git
> > a/tests/qemuxml2argvdata/pc-i440fx-acpi-hotplug-bridge-disable.err
> > b/tests/qemuxml2argvdata/pc-i440fx-acpi-hotplug-bridge-disable.err
> > new file mode 100644
> > index 0000000000..8c09a3cd76
> > --- /dev/null
> > +++ b/tests/qemuxml2argvdata/pc-i440fx-acpi-hotplug-bridge-disable.err
> > @@ -0,0 +1 @@
> > +unsupported configuration: acpi-bridge-hotplug is not available with this
> > QEMU binary
> > diff --git a/tests/qemuxml2argvdata/q35-acpi-hotplug-bridge-disable.args
> > b/tests/qemuxml2argvdata/q35-acpi-hotplug-bridge-disable.args
> > new file mode 100644
> > index 0000000000..007c22c646
> > --- /dev/null
> > +++ b/tests/qemuxml2argvdata/q35-acpi-hotplug-bridge-disable.args
> > @@ -0,0 +1,33 @@
> > +LC_ALL=C \
> > +PATH=/bin \
> > +HOME=/tmp/lib/domain--1-q35 \
> > +USER=test \
> > +LOGNAME=test \
> > +XDG_DATA_HOME=/tmp/lib/domain--1-q35/.local/share \
> > +XDG_CACHE_HOME=/tmp/lib/domain--1-q35/.cache \
> > +XDG_CONFIG_HOME=/tmp/lib/domain--1-q35/.config \
> > +QEMU_AUDIO_DRV=none \
> > +/usr/bin/qemu-system-x86_64 \
> > +-name guest=q35,debug-threads=on \
> > +-S \
> > +-object
> > secret,id=masterKey0,format=raw,file=/tmp/lib/domain--1-q35/master-key.aes \
> > +-machine pc-q35-2.5,accel=tcg,usb=off,dump-guest-core=off \
> > +-m 1024 \
> > +-realtime mlock=off \
> > +-smp 1,sockets=1,cores=1,threads=1 \
> > +-uuid 56f5055c-1b8d-490c-844a-ad646a1caaaa \
> > +-display none \
> > +-no-user-config \
> > +-nodefaults \
> > +-chardev
> > socket,id=charmonitor,path=/tmp/lib/domain--1-q35/monitor.sock,server=on,wait=off
> > \
> > +-mon chardev=charmonitor,id=monitor,mode=control \
> > +-rtc base=utc \
> > +-no-shutdown \
> > +-no-acpi \
> > +-global ICH9-LPC.acpi-pci-hotplug-with-bridge-support=off \
> > +-boot strict=on \
> > +-device i82801b11-bridge,id=pci.1,bus=pcie.0,addr=0x1e \
> > +-device pci-bridge,chassis_nr=2,id=pci.2,bus=pci.1,addr=0x0 \
> > +-device ioh3420,port=0x8,chassis=3,id=pci.3,bus=pcie.0,addr=0x1 \
> > +-device virtio-balloon-pci,id=balloon0,bus=pci.2,addr=0x1 \
> > +-msg timestamp=on
> > diff --git a/tests/qemuxml2argvdata/q35-acpi-hotplug-bridge-disable.err
> > b/tests/qemuxml2argvdata/q35-acpi-hotplug-bridge-disable.err
> > new file mode 100644
> > index 0000000000..8c09a3cd76
> > --- /dev/null
> > +++ b/tests/qemuxml2argvdata/q35-acpi-hotplug-bridge-disable.err
> > @@ -0,0 +1 @@
> > +unsupported configuration: acpi-bridge-hotplug is not available with this
> > QEMU binary
> > diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
> > index 94aaa2f53e..507aa32009 100644
> > --- a/tests/qemuxml2argvtest.c
> > +++ b/tests/qemuxml2argvtest.c
> > @@ -2574,6 +2574,22 @@ mymain(void)
> > DO_TEST("pc-i440fx-acpi-root-hotplug-disable",
> > QEMU_CAPS_PIIX4_ACPI_ROOT_PCI_HOTPLUG);
> > DO_TEST_PARSE_ERROR_NOCAPS("pc-i440fx-acpi-root-hotplug-disable");
> > + DO_TEST("q35-acpi-hotplug-bridge-disable",
> > + QEMU_CAPS_DEVICE_PCI_BRIDGE,
> > + QEMU_CAPS_DEVICE_IOH3420,
> > + QEMU_CAPS_DEVICE_DMI_TO_PCI_BRIDGE, QEMU_CAPS_ICH9_AHCI,
> > + QEMU_CAPS_ICH9_ACPI_HOTPLUG_BRIDGE);
> > + DO_TEST("pc-i440fx-acpi-hotplug-bridge-disable",
> > + QEMU_CAPS_DEVICE_PCI_BRIDGE,
> > + QEMU_CAPS_DEVICE_IOH3420,
> > + QEMU_CAPS_DEVICE_DMI_TO_PCI_BRIDGE,
> > + QEMU_CAPS_PIIX4_ACPI_HOTPLUG_BRIDGE);
> > + DO_TEST_PARSE_ERROR_NOCAPS("q35-acpi-hotplug-bridge-disable");
> > + DO_TEST_PARSE_ERROR_NOCAPS("pc-i440fx-acpi-hotplug-bridge-disable");
> > + /* verify that we fail when acpi-bridge-hotplug option is specified for
> > + * archs other than x86
> > + */
> > + DO_TEST_PARSE_ERROR_NOCAPS("aarch64-acpi-hotplug-bridge-disable");
> > DO_TEST("q35-usb2",
> > QEMU_CAPS_DEVICE_PCI_BRIDGE,
> > QEMU_CAPS_DEVICE_DMI_TO_PCI_BRIDGE,
> >
>
>
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