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[Qemu-discuss] Odp: Re: QEMU Snapshots on Sabrelite IMX.6 do not work

From: alsn
Subject: [Qemu-discuss] Odp: Re: QEMU Snapshots on Sabrelite IMX.6 do not work
Date: Fri, 09 Aug 2019 15:49:24 +0200
User-agent: GWP-Draft

Hi,    Thank you for your response.    Yes, after loading a snapshot monitor 
still works,  I can type commands and it responds, but I am stuck there. I 
cannot go back  to the guest. I am pressing ctrl a c  as usual and guest is 
stopped even after typing continue in monitor and then trying to go back.   I 
am wondering if it may be a problem with my sdcard which I built from 
buildroot, but I did not see any option in buildroots menuconfig which would 
contain any snapshot feature. I have tried to open monitor separately in 
another terminal using telnet, but it always freezes.    Regards,   ...

        Dnia 9 sierpnia 2019 15:04 Peter Maydell <address@hidden> 

         On Fri, 9 Aug 2019 at 13:38,   address@hidden  <address@hidden> 

 Hello,  I'm trying to take and restore a snapshot with
 the whole system state of the Sabrelite  IMX.6  board running
 on QEMU with  commands savevm/loadvm .  It seems that I am able
 to take a snapshot but loading the snapshot fails.

 QEMU stops and I can't switch back from monitor to Linux.
 Typing “cont” doesn’t help. It
 seems like the simulation has freezed. CPU usage on my Laptop machine
 equals 100% until I exit QEMU.

 That sounds like a bug. Save and restore support requires
 handling by every device model in the system, so if some
 device specific to the imx6 is missing this support or
 has a bug in it, then the imx6 save/restore won't work.

 Does the monitor continue to work (in that it will respond
 to commands you type)? Usually if the monitor still works
 but the guest has apparently frozen, this means that some
 state in the UART or interrupt controller isn't migrated
 correctly, so that the guest never sees that you've typed

 -- PMM

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