[libvirt] [PATCH] RFC: qemu: add vmcoreinfo support
Martin Kletzander
mkletzan at redhat.com
Thu Nov 16 14:12:21 UTC 2017
On Mon, Nov 06, 2017 at 01:09:09PM +0100, 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.
>
So is this similar to -fw_cfg name=etc/vmcoreinfo,file=X but in this case it is
not backed by a file, but collected by QEMU itself?
I'm OK with this being a feature.
>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
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