From: Yi Sun <yi.y.sun@linux.intel.com>
To: "Roger Pau Monn�" <roger.pau@citrix.com>
Cc: kevin.tian@intel.com, wei.liu2@citrix.com,
andrew.cooper3@citrix.com, dario.faggioli@citrix.com,
ian.jackson@eu.citrix.com, julien.grall@arm.com,
mengxu@cis.upenn.edu, jbeulich@suse.com,
chao.p.peng@linux.intel.com, xen-devel@lists.xenproject.org,
dgdegra@tycho.nsa.gov
Subject: Re: [PATCH v3 06/15] x86: implement get value interface for MBA
Date: Wed, 20 Sep 2017 17:22:22 +0800 [thread overview]
Message-ID: <20170920092222.GU11006@yi.y.sun> (raw)
In-Reply-To: <20170920084340.6jiokz4v5rrndjiv@dhcp-3-128.uk.xensource.com>
On 17-09-20 09:43:40, Roger Pau Monn� wrote:
> On Wed, Sep 20, 2017 at 01:09:06PM +0800, Yi Sun wrote:
> > On 17-09-19 10:15:42, Roger Pau Monn� wrote:
> > > On Tue, Sep 05, 2017 at 05:32:28PM +0800, Yi Sun wrote:
> > > > diff --git a/xen/arch/x86/domctl.c b/xen/arch/x86/domctl.c
> > > > index 696eff2..7902af7 100644
> > > > --- a/xen/arch/x86/domctl.c
> > > > +++ b/xen/arch/x86/domctl.c
> > > > @@ -1496,6 +1496,13 @@ long arch_do_domctl(
> > > > copyback = true;
> > > > break;
> > > >
> > > > + case XEN_DOMCTL_PSR_ALLOC_GET_MBA_THRTL:
> > > > + ret = psr_get_val(d, domctl->u.psr_alloc.target,
> > > > + &val32, PSR_TYPE_MBA_THRTL);
> > > > + domctl->u.psr_alloc.data = val32;
> > >
> > > Hm, why does psr_get_val take a uint32_t * instead of a uint64_t *? So
> > > that you can directly pass &domctl->u.psr_alloc.data.
> > >
> > > Or the other way around, why is domctl->u.psr_alloc.data a uint64_t
> > > instead of a uint32_t?
> > >
> > There is a historical reason. The COS MSR is 64bit. So, the original codes
> > in L3 CAT (submitted years ago) used uint64_t.
> >
> > But during L2 CAT review, per Jan's comment, the uint64_t is not necessary
> > in psr.c. So, we convert it to uint32_t in psr.c and make the codes you see
> > here.
>
> Since this is a DOMCTL, you can change the type of the structure to be
> an uint32_t, so that you can pass it directly (unless I'm missing
> something else that requires this to be uint64_t).
>
The tools layer implementation uses uint64_t according to SDM definition. So,
we have to do a convertion here or in tools/. Or, we need modify interfaces in
tools layer.
As CAT interfaces in tools layer have been released and it is a natural choice
to make it same as SDM, I think should keep uint64_t in tools at least. If so,
we must do the convertion somewhere. Then, I think it is not so necessary to
change current codes. Is that good to you?
> Roger.
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next prev parent reply other threads:[~2017-09-20 9:23 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-05 9:32 [PATCH v3 00/15] Enable Memory Bandwidth Allocation in Xen Yi Sun
2017-09-05 9:32 ` [PATCH v3 01/15] docs: create Memory Bandwidth Allocation (MBA) feature document Yi Sun
2017-09-18 17:16 ` Roger Pau Monné
2017-09-19 6:07 ` Jan Beulich
2017-09-20 2:59 ` Yi Sun
2017-09-20 3:06 ` Yi Sun
2017-09-20 8:36 ` Roger Pau Monné
2017-09-20 9:08 ` Yi Sun
2017-09-05 9:32 ` [PATCH v3 02/15] Rename PSR sysctl/domctl interfaces and xsm policy to make them be general Yi Sun
2017-09-19 8:03 ` Roger Pau Monné
2017-09-20 3:12 ` Yi Sun
2017-09-05 9:32 ` [PATCH v3 03/15] x86: rename 'cbm_type' to 'psr_type' to make it general Yi Sun
2017-09-19 8:22 ` Roger Pau Monné
2017-09-05 9:32 ` [PATCH v3 04/15] x86: implement data structure and CPU init flow for MBA Yi Sun
2017-09-19 8:55 ` Roger Pau Monné
2017-09-20 3:22 ` Yi Sun
2017-09-20 7:11 ` Jan Beulich
2017-09-20 7:27 ` Yi Sun
2017-09-05 9:32 ` [PATCH v3 05/15] x86: implement get hw info " Yi Sun
2017-09-19 9:08 ` Roger Pau Monné
2017-09-20 5:05 ` Yi Sun
2017-09-05 9:32 ` [PATCH v3 06/15] x86: implement get value interface " Yi Sun
2017-09-19 9:15 ` Roger Pau Monné
2017-09-20 5:09 ` Yi Sun
2017-09-20 8:43 ` Roger Pau Monné
2017-09-20 9:22 ` Yi Sun [this message]
2017-09-20 16:02 ` Wei Liu
2017-09-05 9:32 ` [PATCH v3 07/15] x86: implement set value flow " Yi Sun
2017-09-19 9:57 ` Roger Pau Monné
2017-09-20 5:39 ` Yi Sun
2017-09-05 9:32 ` [PATCH v3 08/15] tools: create general interfaces to support psr allocation features Yi Sun
2017-09-19 10:04 ` Roger Pau Monné
2017-09-20 5:45 ` Yi Sun
2017-09-22 7:01 ` Chao Peng
2017-09-28 16:11 ` Wei Liu
2017-09-05 9:32 ` [PATCH v3 09/15] tools: implement the new libxc get hw info interface Yi Sun
2017-09-19 10:15 ` Roger Pau Monné
2017-09-20 6:13 ` Yi Sun
2017-09-05 9:32 ` [PATCH v3 10/15] tools: implement the new libxl " Yi Sun
2017-09-19 10:28 ` Roger Pau Monné
2017-09-20 6:20 ` Yi Sun
2017-09-05 9:32 ` [PATCH v3 11/15] tools: implement the new xl " Yi Sun
2017-09-19 10:32 ` Roger Pau Monné
2017-09-20 6:23 ` Yi Sun
2017-09-05 9:32 ` [PATCH v3 12/15] tools: rename 'xc_psr_cat_type' to 'xc_psr_type' Yi Sun
2017-09-19 10:34 ` Roger Pau Monné
2017-09-20 6:25 ` Yi Sun
2017-09-05 9:32 ` [PATCH v3 13/15] tools: implement new generic get value interface and MBA get value command Yi Sun
2017-09-19 11:02 ` Roger Pau Monné
2017-09-20 6:46 ` Yi Sun
2017-09-20 8:57 ` Roger Pau Monné
2017-09-20 9:11 ` Yi Sun
2017-09-05 9:32 ` [PATCH v3 14/15] tools: implement new generic set value interface and MBA set " Yi Sun
2017-09-19 11:30 ` Roger Pau Monné
2017-09-20 7:25 ` Yi Sun
2017-09-20 16:10 ` Wei Liu
2017-09-28 16:23 ` Dario Faggioli
2017-09-29 12:58 ` Wei Liu
2017-09-05 9:32 ` [PATCH v3 15/15] docs: add MBA description in docs Yi Sun
2017-09-19 11:37 ` Roger Pau Monné
2017-09-20 7:26 ` Yi Sun
2017-09-28 16:56 ` Dario Faggioli
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