What's going on open channel devices when migrating the Guest ?

15 Jan 2016

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<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Thanks for help.<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p> </o:p></span></p>
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<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:8.5pt;fon=
t-family:"Arial","sans-serif";color:#888888;mso-fareast=
-language:FR">J.P. Ribeauville<o:p></o:p></span></b></p>
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<p class=3D"MsoNormal"><span style=3D"font-size:8.5pt;font-family:"Ari=
al","sans-serif";color:red;mso-fareast-language:FR">P:
</span><span style=3D"font-size:8.5pt;font-family:"Arial","s=
ans-serif";color:#737373;mso-fareast-language:FR">+33.(0).1.47.17.=
20.49</span><span style=3D"font-size:8.5pt;font-family:"Arial",&q=
uot;sans-serif";color:#737373;mso-fareast-language:FR"><o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:8.5pt;font-family:"Ari=
al","sans-serif";color:#737373;mso-fareast-language:FR">.<o:=
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Hi,

I'm using a channel device between host and guest to exchange datas every 2=
0 seconds.

On the Guest size , there is an open /dev/virtio file on which we read cont=
inuously what's
sent by the host.

My question is the following :
When migrating the Guest to another host ,  and the migrating back to the f=
irst one ,
the Guest software doesn't receive anymore datas from the host unless I res=
tart the Guest software to re-open the /dev/virtio file.

Is there any way to detect in the Guest that migration has been done so we =
have to reopen  the file ?

Any hint is welcome .

Thanks for help.

J.P. Ribeauville

P: +33.(0).1.47.17.20.49
.
Puteaux 3 Etage 5  Bureau 4

jpribeauville@axway.com<mailto:jpribeauville@axway.com>
http://www.axway.com<http://www.axway.com/>

P Pensez =E0 l'environnement avant d'imprimer.

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<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I’m using a channel devic=
e between host and guest to exchange datas every 20 seconds.<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">On the Guest size , there is an=
 open /dev/virtio file on which we read continuously what’s
<br>
sent by the host.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">My question is the following : =
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">When migrating the Guest to ano=
ther host ,  and the migrating back to the first one , 
<br>
the Guest software doesn’t receive anymore datas from the host unless=
 I restart the Guest software to re-open the /dev/virtio file.<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Is there any way to detect in t=
he Guest that migration has been done so we have to reopen  the file ?=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Any hint is welcome .<o:p></o:p=
p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:8.5pt;font-family:"Ari=
al","sans-serif";color:#737373;mso-fareast-language:FR">Pute=
aux 3 Etage 5  Bureau 4<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:8.5pt;font-family:"Ari=
al","sans-serif";color:#737373;mso-fareast-language:FR"><o:p=
...
 </o:p></span></p>
<p class=3D"MsoNormal"><u><span lang=3D"EN-US" style=3D"font-size:9.0pt;col=
or:red;mso-fareast-language:FR"><a href=3D"mailto:jpribeauville@axway.com">=
<span lang=3D"FR" style=3D"color:blue">jpribeauville@axway.com</span></a></=
span></u><u><span style=3D"font-size:9.0pt;color:red;mso-fareast-language:F=
R"><br>
</span></u><span style=3D"font-size:9.0pt;color:red;mso-fareast-language:FR=
"><a href=3D"http://www.axway.com/"><span style=3D"color:red">http://www.ax=
way.com</span></a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:8.5pt;font-family:"Ari=
al","sans-serif";color:#737373;mso-fareast-language:FR"><o:p=
 </o:p></span></p>
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<o:p> </o:p></span></p>
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<p class=3D"MsoNormal"><span style=3D"font-size:18.0pt;font-family:Webdings=
;color:#888888;mso-fareast-language:FR">P</span><span style=3D"font-size:8.=
0pt;font-family:"Arial","sans-serif";color:#888888;mso-=
fareast-language:FR"> Pensez =E0 l’environnement avant d’i=
mprimer.</span><span style=3D"font-size:8.0pt;font-family:"Arial"=
,"sans-serif";color:#888888;mso-fareast-language:FR"><o:p></o:p><=
/span></p>
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<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:FR"><o:p> <=
/o:p></span></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
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Jean-Pierre Ribeauville

Vinzenz Feenstra

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