Re: soft lockup after live migration

[Tomasz Chmielewski <mangoo@wpkg.org>]

Marcelo Tosatti wrote:
> Tomasz,
> 
> The screenshots seem to indicate a paravirt mmu problem.
> 
> Try to patch the x86.c file from kvm kernel module with:
> 
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c

> -       case KVM_CAP_PV_MMU:
> -               r = !tdp_enabled;
> +       case KVM_CAP_PV_MMU:    /* obsolete */
> +               r = 0;

> 
> You'll probaby have to do it manually (this disables pvmmu).

With this, some guests fail to start with kernel panic; some have soft 
lockups all the time. Some don't start at all.

And generally, everything is "dead slow".


-- 
Tomasz Chmielewski
http://wpkg.org