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Re: [Qemu-devel] [PATCH RFC V2 4/4] Add virtv2 machine that uses GIC-500

From: Shlomo Pongratz
Subject: Re: [Qemu-devel] [PATCH RFC V2 4/4] Add virtv2 machine that uses GIC-500
Date: Thu, 7 May 2015 11:56:05 +0300

On Thursday, May 7, 2015, Pavel Fedin <address@hidden> wrote:

➢ Thank you for your comment, I might do it after solving the stability issues.

 What kind of stability issues do you have ?
 You know, i was testing 64-bit qemu in TCG mode, and i have also seen weird behavior. The kernel just stops and waits until you hit any key on the console, then it continues. This happens if i try to use more than one CPU. This has to do with guest kernel version, in v4.1rc2 this is gone, while still present in v4.0rc1. Originally i discovered this issue on v3.19. So, perhaps it's some guest kernel flaw, having to do with interrupts.
 The first place where it is stuck is after initializing usbcore. After hitting enter it says "switching clocksource to..." (i don't remember) and goes on. After this it can stop like this again, in some random moment.
 Which kernel version do you use for guest ?

Kind regards,
Pavel Fedin
Expert Engineer
Samsung Electronics Research center Russia

Hi Pavel,

The stability issue is described in patch 0000.
The issue is similar to what you have noticed.
The larger the number of smp cores it is more likely that the boot will get stuck.
I've commuted this patch series as an RFC because of this issue.

Best regards,


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