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

On 08/28/2012 11:38 AM, Alex Jia wrote:
From: Alex Jia <Alex Jia ajia 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.

      Yes, it is a bug.

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 redhat com>
  Virt.xs |    2 +-
  1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/Virt.xs b/Virt.xs
index 2b8d74c..0ebf95d 100644
--- a/Virt.xs
+++ b/Virt.xs
@@ -2833,7 +2833,7 @@ set_scheduler_parameters(dom, newparams, flags=0)

           How about setting flags = -1 as default value.
           set_scheduler_parameters(dom, newparams, flags=-1)
           int flags;

        vir_typed_param_from_hv(newparams, params, nparams);
-      if (flags) {
+      if (flags != 1) {

           if (flags < 0) {
           } else {

            if (virDomainSetSchedulerParametersFlags(dom, params, nparams, flags) < 0)
        } else {

      Your code can work but a little weird in semantics.


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