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<p class="MsoNormal"><span lang="EN-US">Hi Everyone,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">We find migration capabilities is not reset after restarting libvirtd, it would cause problem in the following scene:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Version: libvirt release 7.4.0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Step 1. create a VM and query migration capabilities, mark the return content as “Cap A”<span style="color:#1F497D">.</span><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Step 2. stop the source libvirtd service when executing live migration, then migration failed<span style="color:#1F497D">.</span><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Step 3. restart the source libvirtd service, then query migration capabilities, mark the return content as “Cap B”<span style="color:#1F497D">.</span><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">“Cap A” is different from “Cap B”, because the source libvirtd service would set migration capabilities when executing live migration<span style="color:#1F497D">.</span><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">We find that there is a patch may cause this problem.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Link:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><a href="https://libvirt.org/git/?p=libvirt.git;a=commitdiff;h=a1dec315c9ad87a198245db0077ef80778621392">https://libvirt.org/git/?p=libvirt.git;a=commitdiff;h=a1dec315c9ad87a198245db0077ef80778621392</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">When we roll back this patch, “CAP A” would be the same as “CAP B”.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Do you have any suggestion ?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks.<o:p></o:p></span></p>
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