Re: [Qemu-devel] [RFC PATCH v1 6/6] spapr: Fix migration of Radix guests

[David Gibson]

On Wed, May 17, 2017 at 12:45:39PM +0530, Bharata B Rao wrote:
> On Wed, May 17, 2017 at 05:00:49PM +1000, David Gibson wrote:
> > On Wed, May 17, 2017 at 09:19:22AM +0530, Bharata B Rao wrote:
> > > Fix migration of radix guests by ensuring that we issue
> > > KVM_PPC_CONFIGURE_V3_MMU for radix case post migration.
> > > 
> > > Reported-by: Nageswara R Sastry <address@hidden>
> > > Signed-off-by: Bharata B Rao <address@hidden>
> > > ---
> > >  hw/ppc/spapr.c         | 15 +++++++++++++++
> > >  hw/ppc/spapr_hcall.c   |  1 +
> > >  include/hw/ppc/spapr.h |  1 +
> > >  3 files changed, 17 insertions(+)
> > > 
> > > diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> > > index 05abfc1..dd1d687 100644
> > > --- a/hw/ppc/spapr.c
> > > +++ b/hw/ppc/spapr.c
> > > @@ -1443,6 +1443,20 @@ static int spapr_post_load(void *opaque, int 
> > > version_id)
> > >          err = spapr_rtc_import_offset(&spapr->rtc, spapr->rtc_offset);
> > >      }
> > >  
> > > +    if (spapr->patb_entry) {
> > > +        if (kvmppc_has_cap_mmu_radix() && kvm_enabled()) {
> > > +            err = kvmppc_configure_v3_mmu(POWERPC_CPU(first_cpu),
> > > +                                          spapr->patb_flags &
> > > +                                          SPAPR_PROC_TABLE_RADIX,
> > > +                                          spapr->patb_flags &
> > > +                                          SPAPR_PROC_TABLE_GTSE,
> > 
> > You should be able to work out the things you need here from
> > patb_entry without adding the new patb_flags field.
> 
> kvmppc_configure_v3_mmu() needs two bools: radix and gtse. The radix
> bit can be implied from patb_entry, I needed patb_flags to get the
> gtse value. Not immediately obvious of how to get gtse bit from patb_entry,
> but let me take a relook.

Oh, sorry, you can't get GTSE from the patb_entry, but you can get it
from the LPCR.

-- 
David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!
http://www.ozlabs.org/~dgibson

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