[libvirt] [PATCH] qemu: Support to detach redirdev device
John Ferlan
jferlan at redhat.com
Sat Mar 5 11:52:20 UTC 2016
On 02/27/2016 04:50 AM, Osier Yang wrote:
> Attaching redirdev device has been supported for a while, but detaching
> is not never implemented.
>
> Simple procedure to test:
>
> % lsusb
> Bus 001 Device 014: ID 0781:5567 SanDisk Corp. Cruzer Blade
>
> % usbredirserver -p 4000 0781:5567
>
> % virsh attach-device test usb.xml
>
> % cat usb.xml
> <redirdev bus='usb' type='tcp'>
> <source mode='connect' host='192.168.84.6' service='4000'/>
> </redirdev>
>
> % virsh detach-device test usb.xml
>
> % virsh qemu-monitor-command test --pretty '{"execute": "query-chardev"}' | grep 4000
>
> On success, the chardev should not seen in output of above command.
> ---
> src/conf/domain_conf.c | 67 +++++++++++++++++++++++++++++++++
> src/conf/domain_conf.h | 4 ++
> src/libvirt_private.syms | 3 ++
> src/qemu/qemu_driver.c | 4 +-
> src/qemu/qemu_hotplug.c | 97 +++++++++++++++++++++++++++++++++++++++++++++++-
> src/qemu/qemu_hotplug.h | 3 ++
> 6 files changed, 176 insertions(+), 2 deletions(-)
>
> diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
> index 3b15cb4..d304232 100644
> --- a/src/conf/domain_conf.c
> +++ b/src/conf/domain_conf.c
> @@ -13825,6 +13825,73 @@ virDomainMemoryRemove(virDomainDefPtr def,
> return ret;
> }
>
A little intro - inputs and what it returns (-1 or the index into the
redirdevs for the found redirdev.
> +ssize_t
> +virDomainRedirdevFind(virDomainDefPtr def,
> + virDomainRedirdevDefPtr redirdev)
I see you're essentially copying the virDomainRNGFind... and friends...
> +{
> + size_t i;
> +
> + for (i = 0; i < def->nredirdevs; i++) {
> + virDomainRedirdevDefPtr tmp = def->redirdevs[i];
> +
> + if (redirdev->bus != tmp->bus)
> + continue;
> +
> + virDomainChrSourceDef source_chr = redirdev->source.chr;
> + virDomainChrSourceDef tmp_chr = tmp->source.chr;
> +
> + if (source_chr.type != tmp_chr.type)
> + continue;
Does it matter if the <boot order='#'/> was set in the XML? If it was
the boot device, then should it be allowed to be removed? Found yes,
but removed? I guess that decision is below us though.
> +
> + switch (source_chr.type) {
> + case VIR_DOMAIN_CHR_TYPE_TCP:
> + if (STRNEQ_NULLABLE(source_chr.data.tcp.host,
> + tmp_chr.data.tcp.host))
> + continue;
> + if (STRNEQ_NULLABLE(source_chr.data.tcp.service,
> + tmp_chr.data.tcp.service))
> + continue;
> + if (source_chr.data.tcp.listen != tmp_chr.data.tcp.listen)
> + continue;
> + if (source_chr.data.tcp.protocol != tmp_chr.data.tcp.protocol)
> + continue;
> + break;
> +
> + case VIR_DOMAIN_CHR_TYPE_SPICEVMC:
> + if (source_chr.data.spicevmc != tmp_chr.data.spicevmc)
> + continue;
> + break;
> +
> + default:
> + /* Unlikely, currently redirdev only supports character device of
> + * type "tcp" and "spicevmc".
> + */
Shouldn't this then be a continue; here? IOW: For anything not being
supported we don't want to take the next step, right? I know you're
following the RNG code...
> + break;
> + }
> +
> + if (redirdev->info.type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_NONE &&
Don't think it matters for checking against TYPE_NONE since the
following function does check that... Again more RNG-alike...
> + !virDomainDeviceInfoAddressIsEqual(&redirdev->info, &tmp->info))
> + continue;
Should I assume if we get this far then this is *the* device to be
removed? And there's only one, right?
Hence just "return i;" here (yes, different than rng, more obvious (at
least to me) and thus removes the need for "if (i < def->nredirdevs)"
> +
> + break;
> + }
> +
> + if (i < def->nredirdevs)
> + return i;
> +
> + return -1;
> +}
> +
> +virDomainRedirdevDefPtr
> +virDomainRedirdevRemove(virDomainDefPtr def,
> + size_t idx)
I see this code is just a copy of virDomainRNGRemove; however, I'm not
convinced that's the best mechanism...
The only current caller doesn't check the return value either, although
I do note that the RNG code paths to virDomainRNGRemove have a path that
would use the returned ret value...
> +{
> + virDomainRedirdevDefPtr ret = def->redirdevs[idx];
> +
> + VIR_DELETE_ELEMENT(def->redirdevs, idx, def->nredirdevs);
> +
> + return ret;
> +}
>
> char *
> virDomainDefGetDefaultEmulator(virDomainDefPtr def,
> diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
> index 1de3be3..03c0155 100644
> --- a/src/conf/domain_conf.h
> +++ b/src/conf/domain_conf.h
> @@ -2538,6 +2538,10 @@ void virDomainHostdevDefClear(virDomainHostdevDefPtr def);
> void virDomainHostdevDefFree(virDomainHostdevDefPtr def);
> void virDomainHubDefFree(virDomainHubDefPtr def);
> void virDomainRedirdevDefFree(virDomainRedirdevDefPtr def);
> +ssize_t virDomainRedirdevFind(virDomainDefPtr def,
> + virDomainRedirdevDefPtr redirdev);
> +virDomainRedirdevDefPtr virDomainRedirdevRemove(virDomainDefPtr def,
> + size_t idx);
> void virDomainRedirFilterDefFree(virDomainRedirFilterDefPtr def);
> void virDomainShmemDefFree(virDomainShmemDefPtr def);
> void virDomainDeviceDefFree(virDomainDeviceDefPtr def);
> diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
> index 4b40612..ad7d82c 100644
> --- a/src/libvirt_private.syms
> +++ b/src/libvirt_private.syms
> @@ -423,6 +423,9 @@ virDomainPMSuspendedReasonTypeFromString;
> virDomainPMSuspendedReasonTypeToString;
> virDomainRedirdevBusTypeFromString;
> virDomainRedirdevBusTypeToString;
> +virDomainRedirdevDefFree;
> +virDomainRedirdevFind;
> +virDomainRedirdevRemove;
> virDomainRNGBackendTypeToString;
> virDomainRNGDefFree;
> virDomainRNGFind;
> diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
> index 45ff3c0..8905af6 100644
> --- a/src/qemu/qemu_driver.c
> +++ b/src/qemu/qemu_driver.c
> @@ -7736,6 +7736,9 @@ qemuDomainDetachDeviceLive(virDomainObjPtr vm,
So you're removing from Live, but not Config? Is there a reason?
You've followed the RNG code so far...
> case VIR_DOMAIN_DEVICE_MEMORY:
> ret = qemuDomainDetachMemoryDevice(driver, vm, dev->data.memory);
> break;
> + case VIR_DOMAIN_DEVICE_REDIRDEV:
> + ret = qemuDomainDetachRedirdevDevice(driver, vm, dev->data.redirdev);
> + break;
>
> case VIR_DOMAIN_DEVICE_FS:
> case VIR_DOMAIN_DEVICE_INPUT:
> @@ -7748,7 +7751,6 @@ qemuDomainDetachDeviceLive(virDomainObjPtr vm,
> case VIR_DOMAIN_DEVICE_MEMBALLOON:
> case VIR_DOMAIN_DEVICE_NVRAM:
> case VIR_DOMAIN_DEVICE_SHMEM:
> - case VIR_DOMAIN_DEVICE_REDIRDEV:
> case VIR_DOMAIN_DEVICE_NONE:
> case VIR_DOMAIN_DEVICE_TPM:
> case VIR_DOMAIN_DEVICE_PANIC:
> diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
> index dc76268..bbe8aa7 100644
> --- a/src/qemu/qemu_hotplug.c
> +++ b/src/qemu/qemu_hotplug.c
> @@ -3287,6 +3287,49 @@ qemuDomainRemoveRNGDevice(virQEMUDriverPtr driver,
> }
>
>
> +static int
> +qemuDomainRemoveRedirdevDevice(virQEMUDriverPtr driver,
> + virDomainObjPtr vm,
> + virDomainRedirdevDefPtr redirdev)
> +{
> + qemuDomainObjPrivatePtr priv = vm->privateData;
> + virObjectEventPtr event;
> + char *charAlias = NULL;
> + ssize_t idx;
> + int rc;
> + int ret = -1;
> +
> + VIR_DEBUG("Removing redirdev device %s from domain %p %s",
> + redirdev->info.alias, vm, vm->def->name);
> +
> + if (virAsprintf(&charAlias, "char%s", redirdev->info.alias) < 0)
> + return -1;
> +
> + qemuDomainObjEnterMonitor(driver, vm);
> + rc = qemuMonitorDetachCharDev(priv->mon, charAlias);
> + if (qemuDomainObjExitMonitor(driver, vm) < 0)
> + goto cleanup;
> +
> + virDomainAuditRedirdev(vm, redirdev, "detach", rc == 0);
> +
> + if (rc < 0)
> + goto cleanup;
> +
> + event = virDomainEventDeviceRemovedNewFromObj(vm, redirdev->info.alias);
> + qemuDomainEventQueue(driver, event);
> +
> + if ((idx = virDomainRedirdevFind(vm->def, redirdev)) >= 0)
> + virDomainRedirdevRemove(vm->def, idx);
> + qemuDomainReleaseDeviceAddress(vm, &redirdev->info, NULL);
> + virDomainRedirdevDefFree(redirdev);
There's something inefficient about this...
The only reason to call the Find routine is to get the 'idx' value in
order to pass to the Remove function which can return a pointer to the
redirdev that we already have (and in one path have already gone through
the Find logic).
I know you're copying RNG, but this device isn't the same as that.
Perhaps it'd be better to have a void qemuDomainRedirdevRemove(vm->def,
redirdev) to handle all the logic.
Also w/r/t qemuDomainReleaseDeviceAddress - I find it interesting that
the *Chr* processing handles that in the DetachChrDevice API, while the
RNG handles it in RemoveRNG. Additionally, both of those Attach*Device
paths have error paths which will call the ReleaseDeviceAddress, but the
AttachRedirdevDevice doesn't have similar logic. So the question
becomes - is it a required call for this path?
> +
> + ret = 0;
> +
> + cleanup:
> + VIR_FREE(charAlias);
> + return ret;
> +}
> +
> int
> qemuDomainRemoveDevice(virQEMUDriverPtr driver,
> virDomainObjPtr vm,
> @@ -3318,6 +3361,10 @@ qemuDomainRemoveDevice(virQEMUDriverPtr driver,
> ret = qemuDomainRemoveMemoryDevice(driver, vm, dev->data.memory);
> break;
>
> + case VIR_DOMAIN_DEVICE_REDIRDEV:
> + ret = qemuDomainRemoveRedirdevDevice(driver, vm, dev->data.redirdev);
> + break;
> +
> case VIR_DOMAIN_DEVICE_NONE:
> case VIR_DOMAIN_DEVICE_LEASE:
> case VIR_DOMAIN_DEVICE_FS:
> @@ -3327,7 +3374,6 @@ qemuDomainRemoveDevice(virQEMUDriverPtr driver,
> case VIR_DOMAIN_DEVICE_WATCHDOG:
> case VIR_DOMAIN_DEVICE_GRAPHICS:
> case VIR_DOMAIN_DEVICE_HUB:
> - case VIR_DOMAIN_DEVICE_REDIRDEV:
> case VIR_DOMAIN_DEVICE_SMARTCARD:
> case VIR_DOMAIN_DEVICE_MEMBALLOON:
> case VIR_DOMAIN_DEVICE_NVRAM:
> @@ -4318,3 +4364,52 @@ qemuDomainDetachMemoryDevice(virQEMUDriverPtr driver,
> qemuDomainResetDeviceRemoval(vm);
> return ret;
> }
> +
> +int
> +qemuDomainDetachRedirdevDevice(virQEMUDriverPtr driver,
> + virDomainObjPtr vm,
> + virDomainRedirdevDefPtr redirdev)
> +{
> + qemuDomainObjPrivatePtr priv = vm->privateData;
> + virDomainRedirdevDefPtr tmp;
> + ssize_t idx;
> + int rc;
> + int ret = -1;
> +
> + if (!virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_DEVICE)) {
> + virReportError(VIR_ERR_OPERATION_INVALID, "%s",
> + _("qemu does not support -device"));
> + return -1;
> + }
> +
> + if ((idx = virDomainRedirdevFind(vm->def, redirdev)) < 0) {
> + virReportError(VIR_ERR_OPERATION_INVALID, "%s",
> + _("device not present in domain configuration"));
> + return -1;
> + }
> +
> + tmp = vm->def->redirdevs[idx];
> +
> + if (!tmp->info.alias) {
> + virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> + _("alias not set for redirdev device"));
> + return -1;
> + }
> +
> + qemuDomainMarkDeviceForRemoval(vm, &tmp->info);
> +
> + qemuDomainObjEnterMonitor(driver, vm);
> + rc = qemuMonitorDelDevice(priv->mon, tmp->info.alias);
> + if (qemuDomainObjExitMonitor(driver, vm) || rc < 0)
s/) ||/) < 0 ||/
That is the ExitMonitor needs to check error status... Although I see
the RNG device has the same issue <sigh> - need a separate patch for that.
> + goto cleanup;
> +
> + rc = qemuDomainWaitForDeviceRemoval(vm);
> + if (rc == 0 || rc == 1)
> + ret = qemuDomainRemoveRedirdevDevice(driver, vm, tmp);
So interestingly the DetachChrDevice will:
qemuDomainReleaseDeviceAddress(vm, &tmpChr->info, NULL);
ret = qemuDomainRemoveChrDevice(driver, vm, tmpChr);
But DetachRNG takes a different option; however, I'm still left
wondering if it's necessary in this path.
John
> + else
> + ret = 0;
> +
> + cleanup:
> + qemuDomainResetDeviceRemoval(vm);
> + return ret;
> +}
> diff --git a/src/qemu/qemu_hotplug.h b/src/qemu/qemu_hotplug.h
> index 4140da3..4ef42e9 100644
> --- a/src/qemu/qemu_hotplug.h
> +++ b/src/qemu/qemu_hotplug.h
> @@ -51,6 +51,9 @@ int qemuDomainAttachNetDevice(virConnectPtr conn,
> int qemuDomainAttachRedirdevDevice(virQEMUDriverPtr driver,
> virDomainObjPtr vm,
> virDomainRedirdevDefPtr hostdev);
> +int qemuDomainDetachRedirdevDevice(virQEMUDriverPtr driver,
> + virDomainObjPtr vm,
> + virDomainRedirdevDefPtr redirdev);
> int qemuDomainAttachHostDevice(virConnectPtr conn,
> virQEMUDriverPtr driver,
> virDomainObjPtr vm,
>
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