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qemu: Store chardev 'wait' flag in chardev source private data

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We have just one case when we wish to wait for incomming connections for
a listening socket and that is for vhost-user network devices.

Passing this via a flag to qemuBuildChrChardevStr is unwieldy. Add a
field to qemuDomainChrSourcePrivate and populate it for our special
case inside of qemuDomainPrepareChardevSourceOne.

Since we wait for incomming connections only on startup of a new VM we
also need to pass in a flag whether qemuDomainPrepareChardevSourceOne
is called on a new start or on hotplug.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Peter Krempa 2021-11-03 14:12:16 +01:00
parent 73871c3a30
commit 5b7a777bc8
4 changed files with 14 additions and 5 deletions
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6
src/qemu/qemu_command.c
View File

@ -5051,7 +5051,7 @@ qemuBuildChrChardevStr(virLogManager *logManager G_GNUC_UNUSED,
const virDomainChrSourceDef *dev,
const char *alias,
virQEMUCaps *qemuCaps,
unsigned int cdevflags)
unsigned int cdevflags G_GNUC_UNUSED)
{
qemuDomainChrSourcePrivate *chrSourcePriv = QEMU_DOMAIN_CHR_SOURCE_PRIVATE(dev);
g_auto(virBuffer) buf = VIR_BUFFER_INITIALIZER;
@ -5148,7 +5148,7 @@ qemuBuildChrChardevStr(virLogManager *logManager G_GNUC_UNUSED,
if (dev->data.tcp.listen) {
virBufferAddLit(&buf, ",server=on");
if (cdevflags & QEMU_BUILD_CHARDEV_TCP_NOWAIT)
if (!chrSourcePriv->wait)
virBufferAddLit(&buf, ",wait=off");
}
@ -5199,7 +5199,7 @@ qemuBuildChrChardevStr(virLogManager *logManager G_GNUC_UNUSED,
}
if (dev->data.nix.listen) {
virBufferAddLit(&buf, ",server=on");
if (cdevflags & QEMU_BUILD_CHARDEV_TCP_NOWAIT)
if (!chrSourcePriv->wait)
virBufferAddLit(&buf, ",wait=off");
}

8
src/qemu/qemu_domain.c
View File

@ -9735,6 +9735,7 @@ qemuDomainPrepareChardevSourceOne(virDomainDeviceDef *dev,
void *opaque)
{
struct qemuDomainPrepareChardevSourceData *data = opaque;
qemuDomainChrSourcePrivate *charpriv = QEMU_DOMAIN_CHR_SOURCE_PRIVATE(charsrc);
switch ((virDomainDeviceType) dev->type) {
@ -9750,8 +9751,13 @@ qemuDomainPrepareChardevSourceOne(virDomainDeviceDef *dev,
}
break;
case VIR_DOMAIN_DEVICE_DISK:
case VIR_DOMAIN_DEVICE_NET:
/* when starting a fresh VM, vhost-user network sockets wait for connection */
if (!data->hotplug)
charpriv->wait = true;
break;
case VIR_DOMAIN_DEVICE_DISK:
case VIR_DOMAIN_DEVICE_SHMEM:
case VIR_DOMAIN_DEVICE_LEASE:
case VIR_DOMAIN_DEVICE_FS:

2
src/qemu/qemu_domain.h
View File

@ -344,6 +344,7 @@ struct _qemuDomainChrSourcePrivate {
int fd; /* file descriptor of the chardev source */
int logfd; /* file descriptor of the logging source */
bool wait; /* wait for incomming connections on chardev */
};
@ -866,6 +867,7 @@ int qemuDomainPrepareChannel(virDomainChrDef *chr,
struct qemuDomainPrepareChardevSourceData {
virQEMUDriverConfig *cfg;
bool hotplug;
};
int

3
src/qemu/qemu_driver.c
View File

@ -6777,7 +6777,8 @@ qemuDomainAttachDeviceLive(virDomainObj *vm,
int ret = -1;
const char *alias = NULL;
g_autoptr(virQEMUDriverConfig) cfg = virQEMUDriverGetConfig(driver);
struct qemuDomainPrepareChardevSourceData chardevBackendData = { .cfg = cfg };
struct qemuDomainPrepareChardevSourceData chardevBackendData = { .cfg = cfg,
.hotplug = true };
if (qemuDomainDeviceBackendChardevForeachOne(dev,
qemuDomainPrepareChardevSourceOne,