[libvirt] [PATCHv2 7/7] qemu: add support for vhost-vsock-pci
Ján Tomko
jtomko at redhat.com
Thu May 24 10:39:15 UTC 2018
Create a new vsock endpoint by opening /dev/vhost-vsock,
set the requested CID via ioctl (or assign a free one if auto='yes'),
pass the file descriptor to QEMU and build the command line.
https://bugzilla.redhat.com/show_bug.cgi?id=1291851
Signed-off-by: Ján Tomko <jtomko at redhat.com>
---
src/qemu/qemu_alias.c | 16 ++++++++
src/qemu/qemu_command.c | 45 ++++++++++++++++++++++
src/qemu/qemu_domain.c | 5 +++
src/qemu/qemu_domain.h | 2 +-
src/qemu/qemu_process.c | 35 +++++++++++++++++
.../vhost-vsock-auto.x86_64-latest.args | 32 +++++++++++++++
.../vhost-vsock.x86_64-latest.args | 32 +++++++++++++++
tests/qemuxml2argvtest.c | 14 +++++++
8 files changed, 180 insertions(+), 1 deletion(-)
create mode 100644 tests/qemuxml2argvdata/vhost-vsock-auto.x86_64-latest.args
create mode 100644 tests/qemuxml2argvdata/vhost-vsock.x86_64-latest.args
diff --git a/src/qemu/qemu_alias.c b/src/qemu/qemu_alias.c
index 578a33b284..89dec91ed1 100644
--- a/src/qemu/qemu_alias.c
+++ b/src/qemu/qemu_alias.c
@@ -533,6 +533,18 @@ qemuAssignDeviceInputAlias(virDomainDefPtr def,
}
+static int
+qemuAssignDeviceVsockAlias(virDomainVsockDefPtr vsock)
+{
+ if (vsock->info.alias)
+ return 0;
+ if (VIR_STRDUP(vsock->info.alias, "vsock0") < 0)
+ return -1;
+
+ return 0;
+}
+
+
int
qemuAssignDeviceAliases(virDomainDefPtr def, virQEMUCapsPtr qemuCaps)
{
@@ -629,6 +641,10 @@ qemuAssignDeviceAliases(virDomainDefPtr def, virQEMUCapsPtr qemuCaps)
if (qemuAssignDeviceMemoryAlias(NULL, def->mems[i], false) < 0)
return -1;
}
+ if (def->vsock) {
+ if (qemuAssignDeviceVsockAlias(def->vsock) < 0)
+ return -1;
+ }
return 0;
}
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 9da2d609e8..ef0716d683 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -9865,6 +9865,47 @@ qemuBuildSeccompSandboxCommandLine(virCommandPtr cmd,
}
+static int
+qemuBuildVsockCommandLine(virCommandPtr cmd,
+ virDomainDefPtr def,
+ virDomainVsockDefPtr vsock,
+ const char *fdprefix,
+ virQEMUCapsPtr qemuCaps)
+{
+ qemuDomainVsockPrivatePtr priv = (qemuDomainVsockPrivatePtr)vsock->privateData;
+ const char *device = "vhost-vsock-pci";
+ virBuffer buf = VIR_BUFFER_INITIALIZER;
+ char *devstr = NULL;
+ int ret = -1;
+
+ virBufferAsprintf(&buf, "%s", device);
+ virBufferAsprintf(&buf, ",id=%s", vsock->info.alias);
+ virBufferAsprintf(&buf, ",guest-cid=%u", vsock->guest_cid);
+ virBufferAsprintf(&buf, ",vhostfd=%s%u", fdprefix, priv->vhostfd);
+ if (qemuBuildDeviceAddressStr(&buf, def, &vsock->info, qemuCaps) < 0)
+ goto cleanup;
+#if 0
+ if (qemuBuildVirtioOptionsStr(&buf, net->virtio, qemuCaps) < 0)
+ goto error;
+#endif
+
+ if (virBufferCheckError(&buf) < 0)
+ goto cleanup;
+
+ devstr = virBufferContentAndReset(&buf);
+
+ virCommandPassFD(cmd, priv->vhostfd, VIR_COMMAND_PASS_FD_CLOSE_PARENT);
+ priv->vhostfd = -1;
+ virCommandAddArgList(cmd, "-device", devstr, NULL);
+
+ ret = 0;
+ cleanup:
+ virBufferFreeAndReset(&buf);
+ VIR_FREE(devstr);
+ return ret;
+}
+
+
/*
* Constructs a argv suitable for launching qemu with config defined
* for a given virtual machine.
@@ -10111,6 +10152,10 @@ qemuBuildCommandLine(virQEMUDriverPtr driver,
goto error;
}
+ if (def->vsock &&
+ qemuBuildVsockCommandLine(cmd, def, def->vsock, "", qemuCaps) < 0)
+ goto error;
+
/* In some situations, eg. VFIO passthrough, QEMU might need to lock a
* significant amount of memory, so we need to set the limit accordingly */
virCommandSetMaxMemLock(cmd, qemuDomainGetMemLockLimitBytes(def));
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 527abe3b63..ff24f4b0d2 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -1159,6 +1159,8 @@ qemuDomainVsockPrivateNew(void)
if (!(priv = virObjectNew(qemuDomainVsockPrivateClass)))
return NULL;
+ priv->vhostfd = -1;
+
return (virObjectPtr) priv;
}
@@ -1166,6 +1168,9 @@ qemuDomainVsockPrivateNew(void)
static void
qemuDomainVsockPrivateDispose(void *obj ATTRIBUTE_UNUSED)
{
+ qemuDomainVsockPrivatePtr priv = obj;
+
+ VIR_FORCE_CLOSE(priv->vhostfd);
}
diff --git a/src/qemu/qemu_domain.h b/src/qemu/qemu_domain.h
index 2046741a17..6ddf016eb7 100644
--- a/src/qemu/qemu_domain.h
+++ b/src/qemu/qemu_domain.h
@@ -446,7 +446,7 @@ typedef qemuDomainVsockPrivate *qemuDomainVsockPrivatePtr;
struct _qemuDomainVsockPrivate {
virObject parent;
- virTristateBool maybe;
+ int vhostfd;
};
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index 174d932ae7..e318639963 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -79,6 +79,7 @@
#include "nwfilter_conf.h"
#include "netdev_bandwidth_conf.h"
#include "virresctrl.h"
+#include "virvsock.h"
#define VIR_FROM_THIS VIR_FROM_QEMU
@@ -5975,6 +5976,36 @@ qemuProcessPrepareHostStorage(virQEMUDriverPtr driver,
}
+static int
+qemuProcessOpenVhostVsock(virDomainVsockDefPtr vsock)
+{
+ qemuDomainVsockPrivatePtr priv = (qemuDomainVsockPrivatePtr)vsock->privateData;
+ const char *vsock_path = "/dev/vhost-vsock";
+ int fd;
+
+ if ((fd = open(vsock_path, O_RDWR)) < 0) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ "%s", _("unable to open vhost-vsock device"));
+ return -1;
+ }
+
+ if (vsock->guest_cid) {
+ if (virVsockSetGuestCid(fd, vsock->guest_cid) < 0)
+ goto error;
+ } else {
+ if (virVsockAcquireGuestCid(fd, &vsock->guest_cid) < 0)
+ goto error;
+ }
+
+ priv->vhostfd = fd;
+ return 0;
+
+ error:
+ VIR_FORCE_CLOSE(fd);
+ return -1;
+}
+
+
/**
* qemuProcessPrepareHost:
* @driver: qemu driver
@@ -6000,6 +6031,10 @@ qemuProcessPrepareHost(virQEMUDriverPtr driver,
if (qemuPrepareNVRAM(cfg, vm) < 0)
goto cleanup;
+ if (vm->def->vsock) {
+ if (qemuProcessOpenVhostVsock(vm->def->vsock) < 0)
+ goto cleanup;
+ }
/* network devices must be "prepared" before hostdevs, because
* setting up a network device might create a new hostdev that
* will need to be setup.
diff --git a/tests/qemuxml2argvdata/vhost-vsock-auto.x86_64-latest.args b/tests/qemuxml2argvdata/vhost-vsock-auto.x86_64-latest.args
new file mode 100644
index 0000000000..cefd4e3009
--- /dev/null
+++ b/tests/qemuxml2argvdata/vhost-vsock-auto.x86_64-latest.args
@@ -0,0 +1,32 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-x86_64 \
+-name guest=test,debug-threads=on \
+-S \
+-object secret,id=masterKey0,format=raw,\
+file=/tmp/lib/domain--1-test/master-key.aes \
+-machine pc-0.13,accel=tcg,usb=off,dump-guest-core=off \
+-m 1024 \
+-realtime mlock=off \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid bba65c0e-c049-934f-b6aa-4e2c0582acdf \
+-display none \
+-no-user-config \
+-nodefaults \
+-chardev socket,id=charmonitor,path=/tmp/lib/domain--1-test/monitor.sock,\
+server,nowait \
+-mon chardev=charmonitor,id=monitor,mode=control \
+-rtc base=utc \
+-no-shutdown \
+-no-acpi \
+-boot menu=on,strict=on \
+-device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 \
+-device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x6 \
+-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,\
+resourcecontrol=deny \
+-device vhost-vsock-pci,id=vsock0,guest-cid=42,vhostfd=6789,bus=pci.0,addr=0x2 \
+-msg timestamp=on
diff --git a/tests/qemuxml2argvdata/vhost-vsock.x86_64-latest.args b/tests/qemuxml2argvdata/vhost-vsock.x86_64-latest.args
new file mode 100644
index 0000000000..907af8bb99
--- /dev/null
+++ b/tests/qemuxml2argvdata/vhost-vsock.x86_64-latest.args
@@ -0,0 +1,32 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-x86_64 \
+-name guest=test,debug-threads=on \
+-S \
+-object secret,id=masterKey0,format=raw,\
+file=/tmp/lib/domain--1-test/master-key.aes \
+-machine pc-0.13,accel=tcg,usb=off,dump-guest-core=off \
+-m 1024 \
+-realtime mlock=off \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid bba65c0e-c049-934f-b6aa-4e2c0582acdf \
+-display none \
+-no-user-config \
+-nodefaults \
+-chardev socket,id=charmonitor,path=/tmp/lib/domain--1-test/monitor.sock,\
+server,nowait \
+-mon chardev=charmonitor,id=monitor,mode=control \
+-rtc base=utc \
+-no-shutdown \
+-no-acpi \
+-boot menu=on,strict=on \
+-device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 \
+-device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x6 \
+-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,\
+resourcecontrol=deny \
+-device vhost-vsock-pci,id=vsock0,guest-cid=4,vhostfd=6789,bus=pci.0,addr=0x7 \
+-msg timestamp=on
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index 78454acb1a..759b045e4c 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -532,6 +532,17 @@ testCompareXMLToArgv(const void *data)
}
}
+ if (vm->def->vsock) {
+ virDomainVsockDefPtr vsock = vm->def->vsock;
+ qemuDomainVsockPrivatePtr vsockPriv =
+ (qemuDomainVsockPrivatePtr)vsock->privateData;
+
+ if (vsock->auto_cid == VIR_TRISTATE_BOOL_YES)
+ vsock->guest_cid = 42;
+
+ vsockPriv->vhostfd = 6789;
+ }
+
if (!(cmd = qemuProcessCreatePretendCmd(&driver, vm, migrateURI,
(flags & FLAG_FIPS), false,
VIR_QEMU_PROCESS_START_COLD))) {
@@ -2848,6 +2859,9 @@ mymain(void)
QEMU_CAPS_DEVICE_VIRTIO_MOUSE_CCW,
QEMU_CAPS_DEVICE_VIRTIO_TABLET_CCW);
+ DO_TEST_CAPS_LATEST("vhost-vsock");
+ DO_TEST_CAPS_LATEST("vhost-vsock-auto");
+
if (getenv("LIBVIRT_SKIP_CLEANUP") == NULL)
virFileDeleteTree(fakerootdir);
--
2.16.1
More information about the libvir-list
mailing list