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Re: [Qemu-ppc] [RFC PATCH v1 5/6] spapr: Unregister HPT savevm handlers
From: |
Bharata B Rao |
Subject: |
Re: [Qemu-ppc] [RFC PATCH v1 5/6] spapr: Unregister HPT savevm handlers for radix guests |
Date: |
Wed, 17 May 2017 12:48:21 +0530 |
User-agent: |
Mutt/1.7.1 (2016-10-04) |
On Wed, May 17, 2017 at 04:59:33PM +1000, David Gibson wrote:
> On Wed, May 17, 2017 at 09:19:21AM +0530, Bharata B Rao wrote:
> > HPT gets created by default and later when the guest turns out to be
> > a radix guest, the HPT is destroyed when guest does H_REGISTER_PROC_TBL
> > hcall.
>
> I don't think that's entirely accurate. At least in some KVM
> configurations, we assume radix first, and only allocate the HPT once
> the guest confirms it is doing hash.
Right, that statement is true for TCG radix guests, will rephrase it.
>
> > Let HTAB savevm handlers registration and unregistration follow
> > the same model so that we don't end up having unrequired HTAB savevm
> > handlers for radix guests.
> >
> > This also ensures that HTAB savevm handlers seemlessly get destroyed and
> > recreated like HTAB itself when hash guest reboots.
> >
> > Signed-off-by: Bharata B Rao <address@hidden>
> > ---
> > hw/ppc/spapr.c | 15 +++++++++++++--
> > hw/ppc/spapr_hcall.c | 1 +
> > include/hw/ppc/spapr.h | 2 ++
> > 3 files changed, 16 insertions(+), 2 deletions(-)
> >
> > diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> > index 521eef1..05abfc1 100644
> > --- a/hw/ppc/spapr.c
> > +++ b/hw/ppc/spapr.c
> > @@ -1237,6 +1237,7 @@ static void spapr_reallocate_hpt(sPAPRMachineState
> > *spapr, int shift,
> >
> > /* Clean up any HPT info from a previous boot */
> > spapr_free_hpt(spapr);
> > + spapr_htab_savevm_unregister(spapr);
>
> I'd prefer that the unregister be folded into spapr_free_hpt().
> Basically we want calls that create or remove the HPT and handle
> everything - allocation/freeing if necessary, informing KVM if
> necessary, and registering/deregistering the savevm handlers if
> necesary.
>
> I think that will also remove the need for the trivial
> spapr_htab_savevm_{un,}register() wrappers.
Sure, will consolidate this in the next version.
Regards,
Bharata.