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Date: Mon, 8 Aug 2016 17:06:48 +0800
From: Peter Xu <peterx@redhat.com>
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Subject: Re: [Qemu-devel] [PULL v5 29/57] intel_iommu: add SID validation
 for IR
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To: David Kiarie <davidkiarie4@gmail.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>, QEMU Developers <qemu-devel@nongnu.org>, "Michael S. Tsirkin" <mst@redhat.com>, Peter Maydell <peter.maydell@linaro.org>, Richard Henderson <rth@twiddle.net>, Eduardo Habkost <ehabkost@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, Valentine Sinitsyn <valentine.sinitsyn@gmail.com>

On Tue, Aug 02, 2016 at 03:17:20PM +0300, David Kiarie wrote:
> On Tue, Aug 2, 2016 at 3:12 PM, Peter Xu <peterx@redhat.com> wrote:
> 
> > On Tue, Aug 02, 2016 at 02:58:55PM +0300, David Kiarie wrote:
> > > > Sure. David, so do you like to do it or I cook this patch? :)
> > >
> > > If there are no objections I will look at this employing Jan's approach:
> > > associating a write with an address space.
> >
> > Do you mean to translate current stl_le_phys() into something like
> > address_space_stl_le(), with MemTxAttrs? (in ioapic_service())
> >
> 
> I tried doing something like that but the write gets discarded somewhere. I
> don't see the write from IOMMU side.

Hi, Jan, David,

Sorry to respond late, but what's the version of your guest kernel? I
suspect there is bug in guest IOMMU codes with IR on EOI handling, and
maybe you can try to boost IOAPIC version to 0x20 when with old
kernels using "-global ioapic.version=0x20".

Thanks,

-- peterx