From: "Xu, Quan" <quan.xu@intel.com>
To: George Dunlap <George.Dunlap@eu.citrix.com>
Cc: "Tian, Kevin" <kevin.tian@intel.com>, Keir Fraser <keir@xen.org>,
"Nakajima, Jun" <jun.nakajima@intel.com>,
Liu Jinsong <jinsong.liu@alibaba-inc.com>,
Dario Faggioli <dario.faggioli@citrix.com>,
"xen-devel@lists.xen.org" <xen-devel@lists.xen.org>,
Jan Beulich <jbeulich@suse.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
"Wu, Feng" <feng.wu@intel.com>
Subject: Re: [PATCH 1/2] IOMMU/MMU: Adjust top level functions for VT-d Device-TLB flush error.
Date: Fri, 18 Mar 2016 07:54:27 +0000 [thread overview]
Message-ID: <945CA011AD5F084CBEA3E851C0AB28894B86730F@SHSMSX101.ccr.corp.intel.com> (raw)
In-Reply-To: <CAFLBxZaTyOE61YX+qe_2qXU=zF32fr-409LK5OSm4QzT+z1EJw@mail.gmail.com>
On March 17, 2016 8:30pm, <dunlapg@gmail.com> wrote:
> On Thu, Mar 17, 2016 at 6:54 AM, Quan Xu <quan.xu@intel.com> wrote:
> > diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c index
> > c997b53..526548e 100644
> > --- a/xen/arch/x86/mm.c
> > +++ b/xen/arch/x86/mm.c
> > @@ -2467,7 +2467,7 @@ static int __get_page_type(struct page_info *page,
> unsigned long type,
> > int preemptible) {
> > unsigned long nx, x, y = page->u.inuse.type_info;
> > - int rc = 0;
> > + int rc = 0, ret = 0;
> >
> > ASSERT(!(type & ~(PGT_type_mask | PGT_pae_xen_l2)));
> >
> > @@ -2578,11 +2578,11 @@ static int __get_page_type(struct page_info
> *page, unsigned long type,
> > if ( d && is_pv_domain(d) && unlikely(need_iommu(d)) )
> > {
> > if ( (x & PGT_type_mask) == PGT_writable_page )
> > - iommu_unmap_page(d, mfn_to_gmfn(d,
> page_to_mfn(page)));
> > + ret = iommu_unmap_page(d, mfn_to_gmfn(d,
> page_to_mfn(page)));
> > else if ( type == PGT_writable_page )
> > - iommu_map_page(d, mfn_to_gmfn(d,
> page_to_mfn(page)),
> > - page_to_mfn(page),
> > -
> IOMMUF_readable|IOMMUF_writable);
> > + ret = iommu_map_page(d, mfn_to_gmfn(d,
> page_to_mfn(page)),
> > + page_to_mfn(page),
> > +
> IOMMUF_readable|IOMMUF_writable);
> > }
> > }
> >
> > @@ -2599,6 +2599,9 @@ static int __get_page_type(struct page_info *page,
> unsigned long type,
> > if ( (x & PGT_partial) && !(nx & PGT_partial) )
> > put_page(page);
> >
> > + if ( !rc )
> > + rc = ret;
> > +
>
> What's this about? If the iommu_[un]map_page() operation times out,
> we still go through with calling alloc_page_type(); and if
> alloc_page_type() fails we return its failure value, but if it
> succeeds, we return the error from iommu_[un]map_page()?
>
Yes.
To be honest, to me, it is tricky too.
I found it is not right to return directly if the iommu_[un]map_page() operation times out.
"""if ( d && is_pv_domain(d) && unlikely(need_iommu(d)) )"""
Does IOMMU support pv domain? If not, we'd better remove the " if(...){...}"
Quan
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next prev parent reply other threads:[~2016-03-18 7:54 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-17 6:54 [PATCH 0/2] Check VT-d Device-TLB flush error Quan Xu
2016-03-17 6:54 ` [PATCH 1/2] IOMMU/MMU: Adjust top level functions for " Quan Xu
2016-03-17 7:32 ` Tian, Kevin
2016-03-17 7:58 ` Jan Beulich
2016-03-17 8:00 ` Tian, Kevin
2016-03-17 12:30 ` George Dunlap
2016-03-17 12:33 ` George Dunlap
2016-03-18 3:19 ` Xu, Quan
2016-03-18 8:09 ` Jan Beulich
2016-03-24 6:45 ` Xu, Quan
2016-03-18 7:54 ` Xu, Quan [this message]
2016-03-18 8:19 ` Jan Beulich
2016-03-18 9:09 ` Xu, Quan
2016-03-18 9:29 ` Jan Beulich
2016-03-18 9:38 ` Dario Faggioli
2016-03-18 9:48 ` Jan Beulich
2016-03-21 6:18 ` Tian, Kevin
2016-03-21 12:22 ` Jan Beulich
2016-03-24 9:02 ` Xu, Quan
2016-03-24 9:58 ` Jan Beulich
2016-03-24 14:12 ` Xu, Quan
2016-03-24 14:37 ` Jan Beulich
2016-03-17 17:14 ` Jan Beulich
2016-03-28 3:33 ` Xu, Quan
2016-03-29 7:20 ` Jan Beulich
2016-03-30 2:28 ` Xu, Quan
2016-03-30 2:35 ` Xu, Quan
2016-03-30 8:05 ` Jan Beulich
2016-03-17 6:54 ` [PATCH 2/2] IOMMU/MMU: Adjust low " Quan Xu
2016-03-17 7:37 ` Tian, Kevin
2016-03-18 2:30 ` Xu, Quan
2016-03-18 8:06 ` Jan Beulich
2016-03-21 5:01 ` Tian, Kevin
2016-03-17 15:31 ` George Dunlap
2016-03-18 6:57 ` Xu, Quan
2016-03-18 10:20 ` Jan Beulich
2016-03-25 9:27 ` Xu, Quan
2016-03-29 7:36 ` Jan Beulich
2016-04-11 3:09 ` Xu, Quan
2016-04-11 3:27 ` Xu, Quan
2016-04-11 16:34 ` Jan Beulich
2016-04-12 1:09 ` Xu, Quan
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