[libvirt] [PATCH] qemu: ignore query-sev-capabilities errors

[Peter Krempa]

On Thu, Jun 14, 2018 at 09:04:09 +0100, Daniel Berrange wrote:
> On Thu, Jun 14, 2018 at 09:40:04AM +0200, Ján Tomko wrote:
> > The query-sev-capabilities command fails if SEV is not compiled in,
> > even though both the command and -object sev-guest are present
> > in that case :/
> > 
> > Ignore the errors to avoid spamming the logs:
> > internal error: unable to execute QEMU command 'query-sev-capabilities': SEV feature is not available
> > 
> > Signed-off-by: Ján Tomko <jtomko at redhat.com>
> > ---
> >  src/qemu/qemu_monitor_json.c | 6 ++++++
> >  1 file changed, 6 insertions(+)
> 
> Reviewed-by: Daniel P. Berrangé <berrange at redhat.com>
> 
> > diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
> > index c5480a2d0e..aa89ea7056 100644
> > --- a/src/qemu/qemu_monitor_json.c
> > +++ b/src/qemu/qemu_monitor_json.c
> > @@ -6423,6 +6423,12 @@ qemuMonitorJSONGetSEVCapabilities(qemuMonitorPtr mon,
> >      if (qemuMonitorJSONCommand(mon, cmd, &reply) < 0)
> >          goto cleanup;
> >  
> > +    /* Both -object sev-guest and query-sev-capabilities can be present
> > +     * even if SEV is not available */
> > +    if (qemuMonitorJSONHasError(reply, "GenericError")) {
> 
> I wish QEMU has a nice "NotAvailable" error so we could distinguish it
> from genuine errors :-(

Well, in this case it seems like not advertising the command at all if
SEV is not compiled in would be a better option.
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