From a86cb3601add390b718377be021128fc18e4c9b2 Mon Sep 17 00:00:00 2001

Message-Id: <a86cb3601add390b718377be021128fc18e4c9b2@dist-git>

From: Michal Privoznik <mprivozn@redhat.com>

Date: Thu, 27 Jun 2019 14:44:47 +0200

Subject: [PATCH] qemu_hotplug: Detach guestfwd using netdev_del

The guestfwd channels are -netdevs really. Hotunplug them as

such. Also, DEVICE_DELETED event is not triggered (surprisingly,

since we're not issuing device_del rather than netdev_del) and

associated chardev is removed automagically too. This means that

we need to do qemuDomainRemoveChrDevice() minus monitor call to

remove the chardev.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>

Reviewed-by: John Ferlan <jferlan@redhat.com>

(cherry picked from commit 112f3a8d0f324c0705326957cca4508602b25eba)

https://bugzilla.redhat.com/show_bug.cgi?id=1624204

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>

Message-Id: <de45d53975997bcdbb4260055664a7b0a0079bbe.1561639408.git.mprivozn@redhat.com>

Reviewed-by: Jiri Denemark <jdenemar@redhat.com>

---

 src/qemu/qemu_hotplug.c | 48 ++++++++++++++++++++++++++++-------------

 1 file changed, 33 insertions(+), 15 deletions(-)

diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c

index 468389fa7a..05489cf116 100644

--- a/src/qemu/qemu_hotplug.c

+++ b/src/qemu/qemu_hotplug.c

@@ -4355,25 +4355,28 @@ qemuDomainRemoveNetDevice(virQEMUDriverPtr driver,

 static int

 qemuDomainRemoveChrDevice(virQEMUDriverPtr driver,

                           virDomainObjPtr vm,

-                          virDomainChrDefPtr chr)

+                          virDomainChrDefPtr chr,

+                          bool monitor)

 {

     virObjectEventPtr event;

     char *charAlias = NULL;

     qemuDomainObjPrivatePtr priv = vm->privateData;

     int ret = -1;

-    int rc;

+    int rc = 0;

     VIR_DEBUG("Removing character device %s from domain %p %s",

               chr->info.alias, vm, vm->def->name);

-    if (!(charAlias = qemuAliasChardevFromDevAlias(chr->info.alias)))

-        goto cleanup;

+    if (monitor) {

+        if (!(charAlias = qemuAliasChardevFromDevAlias(chr->info.alias)))

+            goto cleanup;

-    qemuDomainObjEnterMonitor(driver, vm);

-    rc = qemuMonitorDetachCharDev(priv->mon, charAlias);

+        qemuDomainObjEnterMonitor(driver, vm);

+        rc = qemuMonitorDetachCharDev(priv->mon, charAlias);

-    if (qemuDomainObjExitMonitor(driver, vm) < 0)

-        goto cleanup;

+        if (qemuDomainObjExitMonitor(driver, vm) < 0)

+            goto cleanup;

+    }

     if (rc == 0 &&

         qemuDomainDelChardevTLSObjects(driver, vm, chr->source, charAlias) < 0)

@@ -4674,7 +4677,7 @@ qemuDomainRemoveDevice(virQEMUDriverPtr driver,

         break;

     case VIR_DOMAIN_DEVICE_CHR:

-        ret = qemuDomainRemoveChrDevice(driver, vm, dev->data.chr);

+        ret = qemuDomainRemoveChrDevice(driver, vm, dev->data.chr, true);

         break;

     case VIR_DOMAIN_DEVICE_RNG:

         ret = qemuDomainRemoveRNGDevice(driver, vm, dev->data.rng);

@@ -5749,6 +5752,7 @@ int qemuDomainDetachChrDevice(virQEMUDriverPtr driver,

     virDomainDefPtr vmdef = vm->def;

     virDomainChrDefPtr tmpChr;

     char *devstr = NULL;

+    bool guestfwd = false;

     if (!(tmpChr = virDomainChrFind(vmdef, chr))) {

         virReportError(VIR_ERR_DEVICE_MISSING,

@@ -5758,6 +5762,11 @@ int qemuDomainDetachChrDevice(virQEMUDriverPtr driver,

         goto cleanup;

     }

+    /* guestfwd channels are not really -device rather than

+     * -netdev. We need to treat them slightly differently. */

+    guestfwd = tmpChr->deviceType == VIR_DOMAIN_CHR_DEVICE_TYPE_CHANNEL &&

+               tmpChr->targetType == VIR_DOMAIN_CHR_CHANNEL_TARGET_TYPE_GUESTFWD;

+

     if (!tmpChr->info.alias && qemuAssignDeviceChrAlias(vmdef, tmpChr, -1) < 0)

         goto cleanup;

@@ -5766,22 +5775,31 @@ int qemuDomainDetachChrDevice(virQEMUDriverPtr driver,

     if (qemuBuildChrDeviceStr(&devstr, vmdef, tmpChr, priv->qemuCaps) < 0)

         goto cleanup;

-    if (!async)

+    if (!async && !guestfwd)

         qemuDomainMarkDeviceForRemoval(vm, &tmpChr->info);

     qemuDomainObjEnterMonitor(driver, vm);

-    if (devstr && qemuMonitorDelDevice(priv->mon, tmpChr->info.alias) < 0) {

-        ignore_value(qemuDomainObjExitMonitor(driver, vm));

-        goto cleanup;

+    if (guestfwd) {

+        if (qemuMonitorRemoveNetdev(priv->mon, tmpChr->info.alias) < 0) {

+            ignore_value(qemuDomainObjExitMonitor(driver, vm));

+            goto cleanup;

+        }

+    } else {

+        if (devstr && qemuMonitorDelDevice(priv->mon, tmpChr->info.alias) < 0) {

+            ignore_value(qemuDomainObjExitMonitor(driver, vm));

+            goto cleanup;

+        }

     }

     if (qemuDomainObjExitMonitor(driver, vm) < 0)

         goto cleanup;

-    if (async) {

+    if (guestfwd) {

+        ret = qemuDomainRemoveChrDevice(driver, vm, tmpChr, false);

+    } else if (async) {

         ret = 0;

     } else {

         if ((ret = qemuDomainWaitForDeviceRemoval(vm)) == 1)

-            ret = qemuDomainRemoveChrDevice(driver, vm, tmpChr);

+            ret = qemuDomainRemoveChrDevice(driver, vm, tmpChr, true);

     }

  cleanup:

-- 

2.22.0