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From d3759d3674ab9453e5fb5a27ab6c28b8ff8d5569 Mon Sep 17 00:00:00 2001
From: Michal Privoznik <mprivozn@redhat.com>
Date: Tue, 18 Apr 2023 17:34:12 +0200
Subject: [PATCH] qemu: Generate shorter channel target paths
A <channel/> device is basically an UNIX socket into guest.
Whatever is sent from the host, appears in the guest and vice
versa. But because of that, the length of the path to the socket
is important (underscored by fact that we derive the path from
domain short name). But there are still cases where we might not
fit into UNIX_PATH_MAX limit (usually 108 characters), because
the path is derived also from other variables, e.g.
XDG_CONFIG_HOME for session domains.
There are two components though, that are needless: "/target/"
and "domain-" prefix. Drop them. This is safe to do, because
running domains have their path saved in status XML and even
though paths are dropped on migration, they are not part of guest
ABI and thus we are free to change them.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
---
libvirt.spec.in | 1 -
src/qemu/qemu_conf.c | 6 +++---
src/qemu/qemu_domain.c | 15 +++++++++------
.../qemuhotplug-qemu-agent-detach.xml | 2 +-
.../qemuhotplug-base+qemu-agent-detach.xml | 2 +-
.../qemuhotplug-base+qemu-agent.xml | 2 +-
.../qemuhotplug-base-live+qemu-agent-detach.xml | 2 +-
.../qemuhotplug-base-live+qemu-agent.xml | 2 +-
.../qemuxml2argvdata/channel-unix-source-path.xml | 4 ++++
.../channel-unix-source-path-active.xml | 5 +++++
.../channel-unix-source-path-inactive.xml | 4 ++++
tests/testutilsqemu.c | 2 +-
12 files changed, 31 insertions(+), 16 deletions(-)
diff --git a/libvirt.spec.in b/libvirt.spec.in
index 17d5f5ff4a0..3b179d1fd98 100644
--- a/libvirt.spec.in
+++ b/libvirt.spec.in
@@ -2136,7 +2136,6 @@ exit 0
%ghost %dir %{_rundir}/libvirt/qemu/swtpm/
%dir %attr(0751, %{qemu_user}, %{qemu_group}) %{_localstatedir}/lib/libvirt/qemu/
%dir %attr(0751, %{qemu_user}, %{qemu_group}) %{_localstatedir}/lib/libvirt/qemu/channel/
-%dir %attr(0751, %{qemu_user}, %{qemu_group}) %{_localstatedir}/lib/libvirt/qemu/channel/target/
%dir %attr(0751, %{qemu_user}, %{qemu_group}) %{_localstatedir}/lib/libvirt/qemu/checkpoint/
%dir %attr(0751, %{qemu_user}, %{qemu_group}) %{_localstatedir}/lib/libvirt/qemu/dump/
%dir %attr(0751, %{qemu_user}, %{qemu_group}) %{_localstatedir}/lib/libvirt/qemu/nvram/
diff --git a/src/qemu/qemu_conf.c b/src/qemu/qemu_conf.c
index bd984448a39..532fe36be36 100644
--- a/src/qemu/qemu_conf.c
+++ b/src/qemu/qemu_conf.c
@@ -146,7 +146,7 @@ virQEMUDriverConfig *virQEMUDriverConfigNew(bool privileged,
cfg->snapshotDir = g_strdup_printf("%s/snapshot", cfg->libDir);
cfg->checkpointDir = g_strdup_printf("%s/checkpoint", cfg->libDir);
cfg->autoDumpPath = g_strdup_printf("%s/dump", cfg->libDir);
- cfg->channelTargetDir = g_strdup_printf("%s/channel/target", cfg->libDir);
+ cfg->channelTargetDir = g_strdup_printf("%s/channel", cfg->libDir);
cfg->nvramDir = g_strdup_printf("%s/nvram", cfg->libDir);
cfg->memoryBackingDir = g_strdup_printf("%s/ram", cfg->libDir);
} else if (privileged) {
@@ -168,7 +168,7 @@ virQEMUDriverConfig *virQEMUDriverConfigNew(bool privileged,
cfg->snapshotDir = g_strdup_printf("%s/snapshot", cfg->libDir);
cfg->checkpointDir = g_strdup_printf("%s/checkpoint", cfg->libDir);
cfg->autoDumpPath = g_strdup_printf("%s/dump", cfg->libDir);
- cfg->channelTargetDir = g_strdup_printf("%s/channel/target", cfg->libDir);
+ cfg->channelTargetDir = g_strdup_printf("%s/channel", cfg->libDir);
cfg->nvramDir = g_strdup_printf("%s/nvram", cfg->libDir);
cfg->memoryBackingDir = g_strdup_printf("%s/ram", cfg->libDir);
cfg->swtpmStorageDir = g_strdup_printf("%s/lib/libvirt/swtpm",
@@ -202,7 +202,7 @@ virQEMUDriverConfig *virQEMUDriverConfigNew(bool privileged,
cfg->checkpointDir = g_strdup_printf("%s/qemu/checkpoint",
cfg->configBaseDir);
cfg->autoDumpPath = g_strdup_printf("%s/qemu/dump", cfg->configBaseDir);
- cfg->channelTargetDir = g_strdup_printf("%s/qemu/channel/target",
+ cfg->channelTargetDir = g_strdup_printf("%s/qemu/channel",
cfg->configBaseDir);
cfg->nvramDir = g_strdup_printf("%s/qemu/nvram", cfg->configBaseDir);
cfg->memoryBackingDir = g_strdup_printf("%s/qemu/ram", cfg->configBaseDir);
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 029238a9d73..224350dabc3 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -1733,7 +1733,7 @@ qemuDomainSetPrivatePaths(virQEMUDriver *driver,
priv->libDir = g_strdup_printf("%s/domain-%s", cfg->libDir, domname);
if (!priv->channelTargetDir)
- priv->channelTargetDir = g_strdup_printf("%s/domain-%s",
+ priv->channelTargetDir = g_strdup_printf("%s/%s",
cfg->channelTargetDir, domname);
return 0;
@@ -5157,13 +5157,16 @@ qemuDomainDefaultNetModel(const virDomainDef *def,
* Clear auto generated unix socket paths:
*
* libvirt 1.2.18 and older:
- * {cfg->channelTargetDir}/{dom-name}.{target-name}
+ * {cfg->channelTargetDir}/target/{dom-name}.{target-name}
*
* libvirt 1.2.19 - 1.3.2:
- * {cfg->channelTargetDir}/domain-{dom-name}/{target-name}
+ * {cfg->channelTargetDir}/target/domain-{dom-name}/{target-name}
+ *
+ * libvirt 1.3.3 - 9.7.0:
+ * {cfg->channelTargetDir}/target/domain-{dom-id}-{short-dom-name}/{target-name}
*
- * libvirt 1.3.3 and newer:
- * {cfg->channelTargetDir}/domain-{dom-id}-{short-dom-name}/{target-name}
+ * libvirt 9.7.0 and newer:
+ * {cfg->channelTargetDir}/{dom-id}-{short-dom-name}/{target-name}
*
* The unix socket path was stored in config XML until libvirt 1.3.0.
* If someone specifies the same path as we generate, they shouldn't do it.
@@ -5189,7 +5192,7 @@ qemuDomainChrDefDropDefaultPath(virDomainChrDef *chr,
cfg = virQEMUDriverGetConfig(driver);
virBufferEscapeRegex(&buf, "^%s", cfg->channelTargetDir);
- virBufferAddLit(&buf, "/([^/]+\\.)|(domain-[^/]+/)");
+ virBufferAddLit(&buf, "/(target/)?([^/]+\\.)|(domain-[^/]+/)|([0-9]+-[^/]+/)");
virBufferEscapeRegex(&buf, "%s$", chr->target.name);
regexp = virBufferContentAndReset(&buf);
diff --git a/tests/qemuhotplugtestdevices/qemuhotplug-qemu-agent-detach.xml b/tests/qemuhotplugtestdevices/qemuhotplug-qemu-agent-detach.xml
index 0c3c70a78e8..7871de59c40 100644
--- a/tests/qemuhotplugtestdevices/qemuhotplug-qemu-agent-detach.xml
+++ b/tests/qemuhotplugtestdevices/qemuhotplug-qemu-agent-detach.xml
@@ -1,5 +1,5 @@
<channel type='unix'>
- <source mode='bind' path='/tmp/channel/domain-7-hotplug/org.qemu.guest_agent.0'/>
+ <source mode='bind' path='/tmp/channel/7-hotplug/org.qemu.guest_agent.0'/>
<target type='virtio' name='org.qemu.guest_agent.0'/>
<address type='virtio-serial' controller='0' bus='0' port='1'/>
</channel>
diff --git a/tests/qemuhotplugtestdomains/qemuhotplug-base+qemu-agent-detach.xml b/tests/qemuhotplugtestdomains/qemuhotplug-base+qemu-agent-detach.xml
index 728af3391e3..bf2afb67d9c 100644
--- a/tests/qemuhotplugtestdomains/qemuhotplug-base+qemu-agent-detach.xml
+++ b/tests/qemuhotplugtestdomains/qemuhotplug-base+qemu-agent-detach.xml
@@ -39,7 +39,7 @@
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</controller>
<channel type='unix'>
- <source mode='bind' path='/var/lib/libvirt/qemu/channel/target/domain-7-hotplug/org.qemu.guest_agent.0'/>
+ <source mode='bind' path='/tmp/channel/7-hotplug/org.qemu.guest_agent.0'/>
<target type='virtio' name='org.qemu.guest_agent.0'/>
<alias name='channel0'/>
<address type='virtio-serial' controller='0' bus='0' port='1'/>
diff --git a/tests/qemuhotplugtestdomains/qemuhotplug-base+qemu-agent.xml b/tests/qemuhotplugtestdomains/qemuhotplug-base+qemu-agent.xml
index 728af3391e3..31917cee92c 100644
--- a/tests/qemuhotplugtestdomains/qemuhotplug-base+qemu-agent.xml
+++ b/tests/qemuhotplugtestdomains/qemuhotplug-base+qemu-agent.xml
@@ -39,7 +39,7 @@
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</controller>
<channel type='unix'>
- <source mode='bind' path='/tmp/channel/domain-7-hotplug/org.qemu.guest_agent.0'/>
+ <source mode='bind' path='/var/lib/libvirt/qemu/channel/domain-7-hotplug/org.qemu.guest_agent.0'/>
<target type='virtio' name='org.qemu.guest_agent.0'/>
<alias name='channel0'/>
<address type='virtio-serial' controller='0' bus='0' port='1'/>
diff --git a/tests/qemuhotplugtestdomains/qemuhotplug-base-live+qemu-agent-detach.xml b/tests/qemuhotplugtestdomains/qemuhotplug-base-live+qemu-agent-detach.xml
index 728af3391e3..bf2afb67d9c 100644
--- a/tests/qemuhotplugtestdomains/qemuhotplug-base-live+qemu-agent-detach.xml
+++ b/tests/qemuhotplugtestdomains/qemuhotplug-base-live+qemu-agent-detach.xml
@@ -39,7 +39,7 @@
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</controller>
<channel type='unix'>
- <source mode='bind' path='/var/lib/libvirt/qemu/channel/target/domain-7-hotplug/org.qemu.guest_agent.0'/>
+ <source mode='bind' path='/tmp/channel/7-hotplug/org.qemu.guest_agent.0'/>
<target type='virtio' name='org.qemu.guest_agent.0'/>
<alias name='channel0'/>
<address type='virtio-serial' controller='0' bus='0' port='1'/>
diff --git a/tests/qemuhotplugtestdomains/qemuhotplug-base-live+qemu-agent.xml b/tests/qemuhotplugtestdomains/qemuhotplug-base-live+qemu-agent.xml
index 0e4c3907bfb..00191a9cb8b 100644
--- a/tests/qemuhotplugtestdomains/qemuhotplug-base-live+qemu-agent.xml
+++ b/tests/qemuhotplugtestdomains/qemuhotplug-base-live+qemu-agent.xml
@@ -39,7 +39,7 @@
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</controller>
<channel type='unix'>
- <source mode='bind' path='/tmp/channel/domain-7-hotplug/org.qemu.guest_agent.0'/>
+ <source mode='bind' path='/tmp/channel/7-hotplug/org.qemu.guest_agent.0'/>
<target type='virtio' name='org.qemu.guest_agent.0'/>
<alias name='channel0'/>
<address type='virtio-serial' controller='0' bus='0' port='1'/>
diff --git a/tests/qemuxml2argvdata/channel-unix-source-path.xml b/tests/qemuxml2argvdata/channel-unix-source-path.xml
index f24c636147e..db0e99c3d12 100644
--- a/tests/qemuxml2argvdata/channel-unix-source-path.xml
+++ b/tests/qemuxml2argvdata/channel-unix-source-path.xml
@@ -24,6 +24,10 @@
<source mode='bind' path='/tmp/channel/QEMUGuest1/org.qemu.guest_agent.3'/>
<target type='virtio' name='org.qemu.guest_agent.3'/>
</channel>
+ <channel type='unix'>
+ <source mode='bind' path='/var/lib/libvirt/qemu/channel/1-QEMUGuest1/org.qemu.guest_agent.4'/>
+ <target type='virtio' name='org.qemu.guest_agent.4'/>
+ </channel>
<memballoon model='none'/>
</devices>
</domain>
diff --git a/tests/qemuxml2xmloutdata/channel-unix-source-path-active.xml b/tests/qemuxml2xmloutdata/channel-unix-source-path-active.xml
index 0d6a0295f82..68835ceb151 100644
--- a/tests/qemuxml2xmloutdata/channel-unix-source-path-active.xml
+++ b/tests/qemuxml2xmloutdata/channel-unix-source-path-active.xml
@@ -41,6 +41,11 @@
<target type='virtio' name='org.qemu.guest_agent.3'/>
<address type='virtio-serial' controller='0' bus='0' port='4'/>
</channel>
+ <channel type='unix'>
+ <source mode='bind' path='/var/lib/libvirt/qemu/channel/1-QEMUGuest1/org.qemu.guest_agent.4'/>
+ <target type='virtio' name='org.qemu.guest_agent.4'/>
+ <address type='virtio-serial' controller='0' bus='0' port='5'/>
+ </channel>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<audio id='1' type='none'/>
diff --git a/tests/qemuxml2xmloutdata/channel-unix-source-path-inactive.xml b/tests/qemuxml2xmloutdata/channel-unix-source-path-inactive.xml
index d02ea52408d..738c1184c0e 100644
--- a/tests/qemuxml2xmloutdata/channel-unix-source-path-inactive.xml
+++ b/tests/qemuxml2xmloutdata/channel-unix-source-path-inactive.xml
@@ -38,6 +38,10 @@
<target type='virtio' name='org.qemu.guest_agent.3'/>
<address type='virtio-serial' controller='0' bus='0' port='4'/>
</channel>
+ <channel type='unix'>
+ <target type='virtio' name='org.qemu.guest_agent.4'/>
+ <address type='virtio-serial' controller='0' bus='0' port='5'/>
+ </channel>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<audio id='1' type='none'/>
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