Re: [Qemu-devel] Steal time MSR not set properly during live migration?

[Michael Tokarev]

11.06.2015 23:46, Apollon Oikonomopoulos wrote:
> On 15:12 Wed 03 Jun     , Apollon Oikonomopoulos wrote:
>> Any ideas?
> 
> As far as I understand, there is an issue when reading the MSR on the 
> incoming side: there is a KVM_SET_MSRS vcpu ioctl issued by the main 
> thread during initialization, that causes the initial vCPU steal time 
> value to be set using the main thread's (and not the vCPU thread's) 
> run_delay. Then, upon resuming execution, kvm_arch_load_vcpu uses the 
> vCPU thread's run_delay to determine steal time, causing an overflow.  
> The issue was introduced by commit 
> 917367aa968fd4fef29d340e0c7ec8c608dffaab.
> 
> For the full analysis, see https://bugs.debian.org/785557#64 and the 
> followup e-mail.

Adding Cc's...

Thanks,

/mjt