[libvirt] [PATCH] RFC: qemu: add vmcoreinfo support
Marc-André Lureau
marcandre.lureau at gmail.com
Tue Nov 14 16:45:16 UTC 2017
ping, please review/comment
On Mon, Nov 6, 2017 at 1:09 PM, <marcandre.lureau at redhat.com> wrote:
> From: Marc-André Lureau <marcandre.lureau at redhat.com>
>
> Starting from qemu 2.11, the `-device vmcoreinfo` will create a fw_cfg
> entry for a guest to store dump details, necessary to process kernel
> dump with KASLR enabled and providing additional kernel details.
>
> Since the device is a singleton and shouldn't use additional hardware
> resources, I decided to map this to a <feature> element in the libvirt
> domain XML. Feel free to argue and decide if it is better to have it
> under <devices> instead.
>
> The device is arm/x86 only for now (targets that support fw_cfg+dma).
>
> Related to:
> https://bugzilla.redhat.com/show_bug.cgi?id=1395248
>
> Signed-off-by: Marc-André Lureau <marcandre.lureau at redhat.com>
> ---
> docs/formatdomain.html.in | 4 +++
> docs/schemas/domaincommon.rng | 5 +++
> src/conf/domain_conf.c | 5 ++-
> src/conf/domain_conf.h | 1 +
> src/qemu/qemu_capabilities.c | 2 ++
> src/qemu/qemu_capabilities.h | 1 +
> src/qemu/qemu_command.c | 26 +++++++++++++++
> .../qemuxml2argvdata/qemuxml2argv-vmcoreinfo.args | 25 ++++++++++++++
> tests/qemuxml2argvdata/qemuxml2argv-vmcoreinfo.xml | 28 ++++++++++++++++
> tests/qemuxml2argvtest.c | 1 +
> .../qemuxml2xmlout-vmcoreinfo.xml | 38 ++++++++++++++++++++++
> tests/qemuxml2xmltest.c | 1 +
> 12 files changed, 136 insertions(+), 1 deletion(-)
> create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-vmcoreinfo.args
> create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-vmcoreinfo.xml
> create mode 100644 tests/qemuxml2xmloutdata/qemuxml2xmlout-vmcoreinfo.xml
>
> diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
> index 92e14a919..d87a32a89 100644
> --- a/docs/formatdomain.html.in
> +++ b/docs/formatdomain.html.in
> @@ -1878,6 +1878,10 @@
> which is also known as a split I/O APIC mode.
> <span class="since">Since 3.4.0</span> (QEMU/KVM only)
> </dd>
> + <dt><code>vmcoreinfo</code></dt>
> + <dd>Enable QEMU vmcoreinfo device to let the guest kernel save debug
> + details. <span class="since">Since 3.10.0</span> (QEMU only)
> + </dd>
> </dl>
>
> <h3><a id="elementsTime">Time keeping</a></h3>
> diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
> index 9cec1a063..86cbe2c8c 100644
> --- a/docs/schemas/domaincommon.rng
> +++ b/docs/schemas/domaincommon.rng
> @@ -4736,6 +4736,11 @@
> <optional>
> <ref name="ioapic"/>
> </optional>
> + <optional>
> + <element name="vmcoreinfo">
> + <empty/>
> + </element>
> + </optional>
> </interleave>
> </element>
> </optional>
> diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
> index 400e90032..3a9b56cd2 100644
> --- a/src/conf/domain_conf.c
> +++ b/src/conf/domain_conf.c
> @@ -148,7 +148,8 @@ VIR_ENUM_IMPL(virDomainFeature, VIR_DOMAIN_FEATURE_LAST,
> "vmport",
> "gic",
> "smm",
> - "ioapic")
> + "ioapic",
> + "vmcoreinfo")
>
> VIR_ENUM_IMPL(virDomainCapabilitiesPolicy, VIR_DOMAIN_CAPABILITIES_POLICY_LAST,
> "default",
> @@ -18710,6 +18711,7 @@ virDomainDefParseXML(xmlDocPtr xml,
> case VIR_DOMAIN_FEATURE_VIRIDIAN:
> case VIR_DOMAIN_FEATURE_PRIVNET:
> case VIR_DOMAIN_FEATURE_HYPERV:
> + case VIR_DOMAIN_FEATURE_VMCOREINFO:
> case VIR_DOMAIN_FEATURE_KVM:
> def->features[val] = VIR_TRISTATE_SWITCH_ON;
> break;
> @@ -26052,6 +26054,7 @@ virDomainDefFormatInternal(virDomainDefPtr def,
> case VIR_DOMAIN_FEATURE_ACPI:
> case VIR_DOMAIN_FEATURE_PAE:
> case VIR_DOMAIN_FEATURE_VIRIDIAN:
> + case VIR_DOMAIN_FEATURE_VMCOREINFO:
> case VIR_DOMAIN_FEATURE_PRIVNET:
> switch ((virTristateSwitch) def->features[i]) {
> case VIR_TRISTATE_SWITCH_ABSENT:
> diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
> index be38792c6..add668025 100644
> --- a/src/conf/domain_conf.h
> +++ b/src/conf/domain_conf.h
> @@ -1723,6 +1723,7 @@ typedef enum {
> VIR_DOMAIN_FEATURE_GIC,
> VIR_DOMAIN_FEATURE_SMM,
> VIR_DOMAIN_FEATURE_IOAPIC,
> + VIR_DOMAIN_FEATURE_VMCOREINFO,
>
> VIR_DOMAIN_FEATURE_LAST
> } virDomainFeature;
> diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
> index 7cb091056..44a2833a7 100644
> --- a/src/qemu/qemu_capabilities.c
> +++ b/src/qemu/qemu_capabilities.c
> @@ -443,6 +443,7 @@ VIR_ENUM_IMPL(virQEMUCaps, QEMU_CAPS_LAST,
> /* 270 */
> "vxhs",
> "virtio-blk.num-queues",
> + "vmcoreinfo",
> );
>
>
> @@ -1670,6 +1671,7 @@ struct virQEMUCapsStringFlags virQEMUCapsObjectTypes[] = {
> { "pcie-root-port", QEMU_CAPS_DEVICE_PCIE_ROOT_PORT },
> { "qemu-xhci", QEMU_CAPS_DEVICE_QEMU_XHCI },
> { "spapr-pci-host-bridge", QEMU_CAPS_DEVICE_SPAPR_PCI_HOST_BRIDGE },
> + { "vmcoreinfo", QEMU_CAPS_DEVICE_VMCOREINFO },
> };
>
> static struct virQEMUCapsStringFlags virQEMUCapsObjectPropsVirtioBalloon[] = {
> diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
> index cacc2b77e..0cd9755a8 100644
> --- a/src/qemu/qemu_capabilities.h
> +++ b/src/qemu/qemu_capabilities.h
> @@ -429,6 +429,7 @@ typedef enum {
> /* 270 */
> QEMU_CAPS_VXHS, /* -drive file.driver=vxhs via query-qmp-schema */
> QEMU_CAPS_VIRTIO_BLK_NUM_QUEUES, /* virtio-blk-*.num-queues */
> + QEMU_CAPS_DEVICE_VMCOREINFO, /* -device vmcoreinfo */
>
> QEMU_CAPS_LAST /* this must always be the last item */
> } virQEMUCapsFlags;
> diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
> index 8708b79ed..b903b27b9 100644
> --- a/src/qemu/qemu_command.c
> +++ b/src/qemu/qemu_command.c
> @@ -9727,6 +9727,29 @@ qemuBuildTPMCommandLine(virCommandPtr cmd,
> }
>
>
> +static int
> +qemuBuildVMCoreInfoCommandLine(virCommandPtr cmd,
> + const virDomainDef *def,
> + virQEMUCapsPtr qemuCaps)
> +{
> + virTristateSwitch vmci = def->features[VIR_DOMAIN_FEATURE_VMCOREINFO];
> +
> + if (vmci != VIR_TRISTATE_SWITCH_ON) {
> + return 0;
> + }
> +
> + if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_VMCOREINFO)) {
> + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
> + _("vmcoreinfo is not available "
> + "with this QEMU binary"));
> + return -1;
> + }
> +
> + virCommandAddArgList(cmd, "-device", "vmcoreinfo", NULL);
> + return 0;
> +}
> +
> +
> static int
> qemuBuildPanicCommandLine(virCommandPtr cmd,
> const virDomainDef *def,
> @@ -10146,6 +10169,9 @@ qemuBuildCommandLine(virQEMUDriverPtr driver,
> if (qemuBuildNVRAMCommandLine(cmd, def, qemuCaps) < 0)
> goto error;
>
> + if (qemuBuildVMCoreInfoCommandLine(cmd, def, qemuCaps) < 0)
> + goto error;
> +
> if (snapshot)
> virCommandAddArgList(cmd, "-loadvm", snapshot->def->name, NULL);
>
> diff --git a/tests/qemuxml2argvdata/qemuxml2argv-vmcoreinfo.args b/tests/qemuxml2argvdata/qemuxml2argv-vmcoreinfo.args
> new file mode 100644
> index 000000000..772e5a071
> --- /dev/null
> +++ b/tests/qemuxml2argvdata/qemuxml2argv-vmcoreinfo.args
> @@ -0,0 +1,25 @@
> +LC_ALL=C \
> +PATH=/bin \
> +HOME=/home/test \
> +USER=test \
> +LOGNAME=test \
> +QEMU_AUDIO_DRV=none \
> +/usr/bin/qemu-system-i686 \
> +-name QEMUGuest1 \
> +-S \
> +-M pc \
> +-m 214 \
> +-smp 1,sockets=1,cores=1,threads=1 \
> +-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
> +-nographic \
> +-nodefaults \
> +-chardev socket,id=charmonitor,path=/tmp/lib/domain--1-QEMUGuest1/monitor.sock,\
> +server,nowait \
> +-mon chardev=charmonitor,id=monitor,mode=readline \
> +-no-acpi \
> +-boot c \
> +-usb \
> +-drive file=/dev/HostVG/QEMUGuest1,format=raw,if=none,id=drive-ide0-0-0 \
> +-device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 \
> +-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3 \
> +-device vmcoreinfo
> diff --git a/tests/qemuxml2argvdata/qemuxml2argv-vmcoreinfo.xml b/tests/qemuxml2argvdata/qemuxml2argv-vmcoreinfo.xml
> new file mode 100644
> index 000000000..f8e586531
> --- /dev/null
> +++ b/tests/qemuxml2argvdata/qemuxml2argv-vmcoreinfo.xml
> @@ -0,0 +1,28 @@
> +<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='i686' machine='pc'>hvm</type>
> + <boot dev='hd'/>
> + </os>
> + <features>
> + <vmcoreinfo/>
> + </features>
> + <clock offset='utc'/>
> + <on_poweroff>destroy</on_poweroff>
> + <on_reboot>restart</on_reboot>
> + <on_crash>destroy</on_crash>
> + <devices>
> + <emulator>/usr/bin/qemu-system-i686</emulator>
> + <disk type='block' device='disk'>
> + <source dev='/dev/HostVG/QEMUGuest1'/>
> + <target dev='hda' bus='ide'/>
> + <address type='drive' controller='0' bus='0' target='0' unit='0'/>
> + </disk>
> + <controller type='ide' index='0'/>
> + <memballoon model='virtio'/>
> + </devices>
> +</domain>
> diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
> index 2e07b85aa..7b9b846ef 100644
> --- a/tests/qemuxml2argvtest.c
> +++ b/tests/qemuxml2argvtest.c
> @@ -2810,6 +2810,7 @@ mymain(void)
> DO_TEST_PARSE_ERROR("cpu-cache-emulate-l2", QEMU_CAPS_KVM);
> DO_TEST_PARSE_ERROR("cpu-cache-passthrough3", QEMU_CAPS_KVM);
> DO_TEST_PARSE_ERROR("cpu-cache-passthrough-l3", QEMU_CAPS_KVM);
> + DO_TEST("vmcoreinfo", QEMU_CAPS_DEVICE_VMCOREINFO);
>
> DO_TEST("user-aliases", QEMU_CAPS_KVM, QEMU_CAPS_DEVICE_CIRRUS_VGA,
> QEMU_CAPS_OBJECT_MEMORY_FILE, QEMU_CAPS_PIIX_DISABLE_S3,
> diff --git a/tests/qemuxml2xmloutdata/qemuxml2xmlout-vmcoreinfo.xml b/tests/qemuxml2xmloutdata/qemuxml2xmlout-vmcoreinfo.xml
> new file mode 100644
> index 000000000..a3922d630
> --- /dev/null
> +++ b/tests/qemuxml2xmloutdata/qemuxml2xmlout-vmcoreinfo.xml
> @@ -0,0 +1,38 @@
> +<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='i686' machine='pc'>hvm</type>
> + <boot dev='hd'/>
> + </os>
> + <features>
> + <vmcoreinfo/>
> + </features>
> + <clock offset='utc'/>
> + <on_poweroff>destroy</on_poweroff>
> + <on_reboot>restart</on_reboot>
> + <on_crash>destroy</on_crash>
> + <devices>
> + <emulator>/usr/bin/qemu-system-i686</emulator>
> + <disk type='block' device='disk'>
> + <source dev='/dev/HostVG/QEMUGuest1'/>
> + <target dev='hda' bus='ide'/>
> + <address type='drive' controller='0' bus='0' target='0' unit='0'/>
> + </disk>
> + <controller type='ide' index='0'>
> + <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
> + </controller>
> + <controller type='usb' index='0'>
> + <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
> + </controller>
> + <controller type='pci' index='0' model='pci-root'/>
> + <input type='mouse' bus='ps2'/>
> + <input type='keyboard' bus='ps2'/>
> + <memballoon model='virtio'>
> + <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
> + </memballoon>
> + </devices>
> +</domain>
> diff --git a/tests/qemuxml2xmltest.c b/tests/qemuxml2xmltest.c
> index 5a282e5ff..9a7d460e5 100644
> --- a/tests/qemuxml2xmltest.c
> +++ b/tests/qemuxml2xmltest.c
> @@ -1260,6 +1260,7 @@ mymain(void)
> DO_TEST("cpu-check-default-none2", NONE);
> DO_TEST("cpu-check-default-partial", NONE);
> DO_TEST("cpu-check-default-partial2", NONE);
> + DO_TEST("vmcoreinfo", NONE);
>
> DO_TEST("smartcard-host", NONE);
> DO_TEST("smartcard-host-certificates", NONE);
> --
> 2.15.0.rc0.40.gaefcc5f6f
>
> --
> libvir-list mailing list
> libvir-list at redhat.com
> https://www.redhat.com/mailman/listinfo/libvir-list
--
Marc-André Lureau
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