[libvirt] [PATCH v3 9/9] qemu: add 'ramfb' attribute for mediated devices
Jonathon Jongsma
jjongsma at redhat.com
Fri Oct 18 15:30:17 UTC 2019
The 'ramfb' attribute provides a framebuffer to the guest that can be
used as a boot display for the vgpu
For example, the following configuration can be used to provide a vgpu
with a boot display:
<hostdev mode='subsystem' type='mdev' model='vfio-pci' display='on' ramfb='on'>
<source>
<address uuid='$UUID'/>
</source>
</hostdev>
Signed-off-by: Jonathon Jongsma <jjongsma at redhat.com>
---
docs/formatdomain.html.in | 8 ++++
docs/schemas/domaincommon.rng | 5 +++
src/conf/domain_conf.c | 11 ++++++
src/conf/domain_conf.h | 1 +
src/qemu/qemu_command.c | 17 ++++++++-
...tdev-mdev-display-ramfb.x86_64-latest.args | 37 +++++++++++++++++++
.../hostdev-mdev-display-ramfb.xml | 33 +++++++++++++++++
tests/qemuxml2argvtest.c | 1 +
8 files changed, 112 insertions(+), 1 deletion(-)
create mode 100644 tests/qemuxml2argvdata/hostdev-mdev-display-ramfb.x86_64-latest.args
create mode 100644 tests/qemuxml2argvdata/hostdev-mdev-display-ramfb.xml
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 500f114f41..50f9ff9618 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -4847,6 +4847,14 @@
<a href="#elementsGraphics">graphical framebuffer</a> in order to
use this attribute, currently only supported with VNC, Spice and
egl-headless graphics devices.
+
+ <span class="since">Since version 5.9.0</span>, there is an optional
+ <code>ramfb</code> attribute for devices with
+ <code>model='vfio-pci'</code>. Supported values are either
+ <code>on</code> or <code>off</code> (default is 'off'). When
+ enabled, this attribute provides a memory framebuffer device to the
+ guest. This framebuffer will be used as a boot display when a vgpu
+ device is the primary display.
<p>
Note: There are also some implications on the usage of guest's
address type depending on the <code>model</code> attribute,
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index ead5a25068..57e0dcf6ed 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -4769,6 +4769,11 @@
<value>vfio-ap</value>
</choice>
</attribute>
+ <optional>
+ <attribute name="ramfb">
+ <ref name="virOnOff"/>
+ </attribute>
+ </optional>
<optional>
<attribute name="display">
<ref name="virOnOff"/>
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 2e6a113de3..ab75f13eec 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -8130,6 +8130,7 @@ virDomainHostdevDefParseXMLSubsys(xmlNodePtr node,
g_autofree char *backendStr = NULL;
g_autofree char *model = NULL;
g_autofree char *display = NULL;
+ g_autofree char *ramfb = NULL;
/* @managed can be read from the xml document - it is always an
* attribute of the toplevel element, no matter what type of
@@ -8145,6 +8146,7 @@ virDomainHostdevDefParseXMLSubsys(xmlNodePtr node,
rawio = virXMLPropString(node, "rawio");
model = virXMLPropString(node, "model");
display = virXMLPropString(node, "display");
+ ramfb = virXMLPropString(node, "ramfb");
/* @type is passed in from the caller rather than read from the
* xml document, because it is specified in different places for
@@ -8253,6 +8255,15 @@ virDomainHostdevDefParseXMLSubsys(xmlNodePtr node,
display);
return -1;
}
+
+ if (ramfb &&
+ (mdevsrc->ramfb = virTristateSwitchTypeFromString(ramfb)) <= 0) {
+ virReportError(VIR_ERR_XML_ERROR,
+ _("unknown value '%s' for <hostdev> attribute "
+ "'ramfb'"),
+ ramfb);
+ return -1;
+ }
}
switch (def->source.subsys.type) {
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index edac6250e4..72b2a8c482 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -262,6 +262,7 @@ struct _virDomainHostdevSubsysMediatedDev {
int model; /* enum virMediatedDeviceModelType */
int display; /* virTristateSwitch */
char uuidstr[VIR_UUID_STRING_BUFLEN]; /* mediated device's uuid string */
+ int ramfb; /* virTristateSwitch */
};
typedef enum {
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index e98195b1d7..1a2d0c173d 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -5416,6 +5416,17 @@ qemuBuildChrChardevStr(virLogManagerPtr logManager,
return virBufferContentAndReset(&buf);
}
+static const char *
+qemuBuildHostdevMdevModelTypeString(virDomainHostdevSubsysMediatedDevPtr mdev)
+{
+ /* when the 'ramfb' attribute is set, we must use the nohotplug variant
+ * rather than 'vfio-pci' */
+ if (mdev->model == VIR_MDEV_MODEL_TYPE_VFIO_PCI &&
+ mdev->ramfb == VIR_TRISTATE_SWITCH_ON)
+ return "vfio-pci-nohotplug";
+
+ return virMediatedDeviceModelTypeToString(mdev->model);
+}
char *
qemuBuildHostdevMediatedDevStr(const virDomainDef *def,
@@ -5430,7 +5441,7 @@ qemuBuildHostdevMediatedDevStr(const virDomainDef *def,
if (!(mdevPath = virMediatedDeviceGetSysfsPath(mdevsrc->uuidstr)))
return NULL;
- dev_str = virMediatedDeviceModelTypeToString(mdevsrc->model);
+ dev_str = qemuBuildHostdevMdevModelTypeString(mdevsrc);
if (!dev_str)
return NULL;
@@ -5448,6 +5459,10 @@ qemuBuildHostdevMediatedDevStr(const virDomainDef *def,
if (dev->info->bootIndex)
virBufferAsprintf(&buf, ",bootindex=%u", dev->info->bootIndex);
+ if (mdevsrc->ramfb == VIR_TRISTATE_SWITCH_ON)
+ virBufferAsprintf(&buf, ",ramfb=%s",
+ virTristateSwitchTypeToString(mdevsrc->ramfb));
+
if (virBufferCheckError(&buf) < 0)
return NULL;
diff --git a/tests/qemuxml2argvdata/hostdev-mdev-display-ramfb.x86_64-latest.args b/tests/qemuxml2argvdata/hostdev-mdev-display-ramfb.x86_64-latest.args
new file mode 100644
index 0000000000..30d2f83318
--- /dev/null
+++ b/tests/qemuxml2argvdata/hostdev-mdev-display-ramfb.x86_64-latest.args
@@ -0,0 +1,37 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/tmp/lib/domain--1-QEMUGuest2 \
+USER=test \
+LOGNAME=test \
+XDG_DATA_HOME=/tmp/lib/domain--1-QEMUGuest2/.local/share \
+XDG_CACHE_HOME=/tmp/lib/domain--1-QEMUGuest2/.cache \
+XDG_CONFIG_HOME=/tmp/lib/domain--1-QEMUGuest2/.config \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-i686 \
+-name guest=QEMUGuest2,debug-threads=on \
+-S \
+-object secret,id=masterKey0,format=raw,\
+file=/tmp/lib/domain--1-QEMUGuest2/master-key.aes \
+-machine pc,accel=tcg,usb=off,dump-guest-core=off \
+-m 214 \
+-overcommit mem-lock=off \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-no-user-config \
+-nodefaults \
+-chardev socket,id=charmonitor,fd=1729,server,nowait \
+-mon chardev=charmonitor,id=monitor,mode=control \
+-rtc base=utc \
+-no-shutdown \
+-no-acpi \
+-boot strict=on \
+-device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 \
+-vnc 127.0.0.1:0 \
+-device qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,\
+vram64_size_mb=0,vgamem_mb=16,max_outputs=1,bus=pci.0,addr=0x2 \
+-device vfio-pci-nohotplug,id=hostdev0,\
+sysfsdev=/sys/bus/mdev/devices/53764d0e-85a0-42b4-af5c-2046b460b1dc,display=on,\
+bus=pci.0,addr=0x3,ramfb=on \
+-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,\
+resourcecontrol=deny \
+-msg timestamp=on
diff --git a/tests/qemuxml2argvdata/hostdev-mdev-display-ramfb.xml b/tests/qemuxml2argvdata/hostdev-mdev-display-ramfb.xml
new file mode 100644
index 0000000000..2e7851b2b0
--- /dev/null
+++ b/tests/qemuxml2argvdata/hostdev-mdev-display-ramfb.xml
@@ -0,0 +1,33 @@
+<domain type='qemu'>
+ <name>QEMUGuest2</name>
+ <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+ <memory unit='KiB'>219136</memory>
+ <currentMemory unit='KiB'>219136</currentMemory>
+ <vcpu placement='static'>1</vcpu>
+ <os>
+ <type arch='i686' machine='pc'>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-i686</emulator>
+ <controller type='usb' index='0'>
+ </controller>
+ <controller type='pci' index='0' model='pci-root'/>
+ <controller type='ide' index='0'>
+ </controller>
+ <graphics type='vnc'/>
+ <hostdev mode='subsystem' type='mdev' model='vfio-pci' display='on' ramfb='on'>
+ <source>
+ <address uuid='53764d0e-85a0-42b4-af5c-2046b460b1dc'/>
+ </source>
+ </hostdev>
+ <video>
+ <model type='qxl' heads='1'/>
+ </video>
+ <memballoon model='none'/>
+ </devices>
+</domain>
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index 7c314050f6..56fb6f00a9 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -1638,6 +1638,7 @@ mymain(void)
DO_TEST_PARSE_ERROR("hostdev-mdev-display-missing-graphics",
QEMU_CAPS_DEVICE_VFIO_PCI,
QEMU_CAPS_VFIO_PCI_DISPLAY);
+ DO_TEST_CAPS_LATEST("hostdev-mdev-display-ramfb");
DO_TEST_PARSE_ERROR("hostdev-vfio-zpci-wrong-arch",
QEMU_CAPS_DEVICE_VFIO_PCI);
DO_TEST("hostdev-vfio-zpci",
--
2.21.0
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