Re: [PATCH V2 1/2] qemu: forbid define a capabilities mode hostdev

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----- Original Message -----
> On 06/19/14 13:05, Jincheng Miao wrote:
> > hostdev has mode "capabilities" for LXC, from formatdomain.html:
> > "
> > Block / character devices from the host can be passed through to
> > the guest using the hostdev element.
> > This is only possible with container based virtualization.
> > since after 1.0.1 for LXC
> > "
> > So forbid capabilities mode hostdev if domain is not LXC.
> > 
> > The related bug is:
> > https://bugzilla.redhat.com/show_bug.cgi?id=1111044
> > 
> > Signed-off-by: Jincheng Miao <jmiao@xxxxxxxxxx>
> > ---
> >  src/qemu/qemu_command.c | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> > 
> > diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
> > index 2caee66..338235a 100644
> > --- a/src/qemu/qemu_command.c
> > +++ b/src/qemu/qemu_command.c
> > @@ -8907,6 +8907,14 @@ qemuBuildCommandLine(virConnectPtr conn,
> >          virDomainHostdevDefPtr hostdev = def->hostdevs[i];
> >          char *devstr;
> >  
> > +        /* forbid capabilities mode hostdev in this type of hypervisor */
> > +        if (hostdev->mode == VIR_DOMAIN_HOSTDEV_MODE_CAPABILITIES) {
> 
> This apparently doesn't depend on the actual qemu binary nor the state
> of the system.
> 
> For such checks we have the domain XML post parse callbacks which point
> out the error at define time (as it's actually invalid XML from the
> point of view of the qemu driver) and not when the user attempts to
> start a VM

Yes, I think I can find that callback function .devicesPostParseCallback().

and the function implements are:
libxlDomainDeviceDefPostParse(),
virLXCDomainDeviceDefPostParse(),
openvzDomainDeviceDefPostParse(),
qemuDomainDeviceDefPostParse(),
umlDomainDeviceDefPostParse(),
xenDomainDeviceDefPostParse(),
xenapiDomainDeviceDefPostParse()

I think I should patch them except LXC.


> 
> > +            virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
> > +                           _("Unsupported capabilities mode hostdev in
> > %s"),
> > +                           virDomainVirtTypeToString(def->virtType));
> > +            goto error;
> > +        }
> > +
> >          if (hostdev->info->bootIndex) {
> >              if (hostdev->mode != VIR_DOMAIN_HOSTDEV_MODE_SUBSYS ||
> >                  (hostdev->source.subsys.type !=
> >                  VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI &&
> > 
> 
> Peter
> 
> 

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