Re: [libvirt] [PATCH] RFC: qemu: add vmcoreinfo support

From: Marc-André Lureau <marcandre.lureau(a)redhat.com&gt; 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(a)redhat.com&gt; --- 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(a)redhat.com https://www.redhat.com/mailman/listinfo/libvir-list