[libvirt] [libvirt-perl PATCH v2] Virt.xs: fix flag issue on set_scheduler_parameters

[Alex Jia]

From: Alex Jia <Alex Jia ajia at redhat.com>

The default flags are inconsistent on both qemuSetSchedulerParameters()
and qemuGetSchedulerParameters() in libvirt, the qemuGetSchedulerParameters()
always passes 'VIR_DOMAIN_AFFECT_CURRENT' flag to the qemuGetSchedulerParametersFlags(),
it should be a expected behavior, but the qemuSetSchedulerParameters() always passes
'VIR_DOMAIN_AFFECT_LIVE' flag to the qemuSetSchedulerParametersFlags(), if users use
default flag=0 or explicitly give a 'VIR_DOMAIN_AFFECT_CURRENT' flag to the
set_scheduler_parameters() in perl-Sys-Virt, because the flag value is 0, the result is
the virDomainSetSchedulerParameters() is called incorrectly.

In fact, it's enough to call the qemuSetSchedulerParametersFlags() regardless of what flag is
like 'virsh schedinfo' command.

How to reproduce?

# cat test.pl

#!/usr/bin/env perl
use warnings;
use strict;
use Sys::Virt;

my $uri = "qemu:///system";
my $domname = "foo";              # change your guest name
my $con = Sys::Virt->new(address => $uri, readonly => 0);
my $dom = $con->get_domain_by_name($domname);
my %sched_param = (Sys::Virt::Domain::SCHEDULER_CPU_SHARES=>1);
$dom->set_scheduler_parameters(\%sched_param, Sys::Virt::Domain::AFFECT_CURRENT);

# perl test.pl
libvirt error code: 55, message: Requested operation is not valid: domain is not running

Signed-off-by: Alex Jia <Alex Jia ajia at redhat.com>
---
 Virt.xs |   10 +++-------
 1 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/Virt.xs b/Virt.xs
index 2b8d74c..fa58cc6 100644
--- a/Virt.xs
+++ b/Virt.xs
@@ -2833,13 +2833,9 @@ set_scheduler_parameters(dom, newparams, flags=0)
           }
       }
       vir_typed_param_from_hv(newparams, params, nparams);
-      if (flags) {
-          if (virDomainSetSchedulerParametersFlags(dom, params, nparams, flags) < 0)
-              _croak_error();
-      } else {
-          if (virDomainSetSchedulerParameters(dom, params, nparams) < 0)
-              _croak_error();
-      }
+
+      if (virDomainSetSchedulerParametersFlags(dom, params, nparams, flags) < 0)
+          _croak_error();
       Safefree(params);
 
 
-- 
1.7.1