[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH RFC v4 16/20] intel_iommu: do replay when contex
From: |
Peter Xu |
Subject: |
Re: [Qemu-devel] [PATCH RFC v4 16/20] intel_iommu: do replay when context invalidate |
Date: |
Wed, 25 Jan 2017 14:44:50 +0800 |
User-agent: |
Mutt/1.5.24 (2015-08-30) |
On Wed, Jan 25, 2017 at 06:37:23AM +0000, Tian, Kevin wrote:
> > From: Peter Xu [mailto:address@hidden
> > Sent: Wednesday, January 25, 2017 11:46 AM
> >
> > On Wed, Jan 25, 2017 at 11:09:39AM +0800, Jason Wang wrote:
> > >
> > >
> > > On 2017年01月24日 12:52, Peter Xu wrote:
> > > >On Mon, Jan 23, 2017 at 06:36:17PM +0800, Jason Wang wrote:
> > > >>
> > > >>On 2017年01月20日 21:08, Peter Xu wrote:
> > > >>>Before this one we only invalidate context cache when we receive
> > > >>>context
> > > >>>entry invalidations. However it's possible that the invalidation also
> > > >>>contains a domain switch (only if cache-mode is enabled for vIOMMU). In
> > > >>>that case we need to notify all the registered components about the new
> > > >>>mapping.
> > > >>>
> > > >>>Signed-off-by: Peter Xu <address@hidden>
> > > >>>---
> > > >>> hw/i386/intel_iommu.c | 10 ++++++++++
> > > >>> 1 file changed, 10 insertions(+)
> > > >>>
> > > >>>diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
> > > >>>index f9c5142..4b08b4d 100644
> > > >>>--- a/hw/i386/intel_iommu.c
> > > >>>+++ b/hw/i386/intel_iommu.c
> > > >>>@@ -1146,6 +1146,16 @@ static void
> > vtd_context_device_invalidate(IntelIOMMUState *s,
> > > >>> trace_vtd_inv_desc_cc_device(bus_n,
> > > >>> VTD_PCI_SLOT(devfn_it),
> > > >>> VTD_PCI_FUNC(devfn_it));
> > > >>> vtd_as->context_cache_entry.context_cache_gen = 0;
> > > >>>+ /*
> > > >>>+ * So a device is moving out of (or moving into) a
> > > >>>+ * domain, a replay() suites here to notify all the
> > > >>>+ * IOMMU_NOTIFIER_MAP registers about this change.
> > > >>>+ * This won't bring bad even if we have no such
> > > >>>+ * notifier registered - the IOMMU notification
> > > >>>+ * framework will skip MAP notifications if that
> > > >>>+ * happened.
> > > >>>+ */
> > > >>>+ memory_region_iommu_replay_all(&vtd_as->iommu);
> > > >>DSI and GLOBAL questions come back again or no need to care about them
> > > >>:) ?
> > > >DSI/GLOBAL hanldings are in patch 20 (though it'll be squashed into 18
> > > >in my next post). Is that what you mean above?
> > >
> > > Seems not, I mean DSI/GLOBAL for context cache invalidation instead of
> > > IOTLB
> > > :)
> >
> > Yes, I should possibly do the same thing for context cache global
> > invalidations. IIUC context global invalidation should be a superset
> > of iotlb invalidation, so maybe I'll add one more patch to call iotlb
> > invalidation in context invalidation as well. Kevin/others, please
> > correct me if I misunderstood the spec. Thanks,
> >
>
> context invalidation is not superset of iotlb invalidation. The spec just
> requires software to always follow a context-cache invalidation with
> a PASID-cache invalidation, followed by an IOTLB invalidation.
Thanks for pointing out. If so, looks like current version suffice for
this, right? (so no further change needed for this one)
-- peterx
- [Qemu-devel] [PATCH RFC v4 11/20] memory: provide IOMMU_NOTIFIER_FOREACH macro, (continued)
- [Qemu-devel] [PATCH RFC v4 11/20] memory: provide IOMMU_NOTIFIER_FOREACH macro, Peter Xu, 2017/01/20
- [Qemu-devel] [PATCH RFC v4 12/20] memory: provide iommu_replay_all(), Peter Xu, 2017/01/20
- [Qemu-devel] [PATCH RFC v4 13/20] memory: introduce memory_region_notify_one(), Peter Xu, 2017/01/20
- [Qemu-devel] [PATCH RFC v4 14/20] memory: add MemoryRegionIOMMUOps.replay() callback, Peter Xu, 2017/01/20
- [Qemu-devel] [PATCH RFC v4 16/20] intel_iommu: do replay when context invalidate, Peter Xu, 2017/01/20
- Re: [Qemu-devel] [PATCH RFC v4 16/20] intel_iommu: do replay when context invalidate, Jason Wang, 2017/01/23
- Re: [Qemu-devel] [PATCH RFC v4 16/20] intel_iommu: do replay when context invalidate, Peter Xu, 2017/01/23
- Re: [Qemu-devel] [PATCH RFC v4 16/20] intel_iommu: do replay when context invalidate, Jason Wang, 2017/01/24
- Re: [Qemu-devel] [PATCH RFC v4 16/20] intel_iommu: do replay when context invalidate, Peter Xu, 2017/01/24
- Re: [Qemu-devel] [PATCH RFC v4 16/20] intel_iommu: do replay when context invalidate, Tian, Kevin, 2017/01/25
- Re: [Qemu-devel] [PATCH RFC v4 16/20] intel_iommu: do replay when context invalidate,
Peter Xu <=
- Re: [Qemu-devel] [PATCH RFC v4 16/20] intel_iommu: do replay when context invalidate, Jason Wang, 2017/01/25
[Qemu-devel] [PATCH RFC v4 15/20] intel_iommu: provide its own replay() callback, Peter Xu, 2017/01/20
- Re: [Qemu-devel] [PATCH RFC v4 15/20] intel_iommu: provide its own replay() callback, Jason Wang, 2017/01/22
- Re: [Qemu-devel] [PATCH RFC v4 15/20] intel_iommu: provide its own replay() callback, Jason Wang, 2017/01/22
- Re: [Qemu-devel] [PATCH RFC v4 15/20] intel_iommu: provide its own replay() callback, Peter Xu, 2017/01/22
- Re: [Qemu-devel] [PATCH RFC v4 15/20] intel_iommu: provide its own replay() callback, Jason Wang, 2017/01/22
- Re: [Qemu-devel] [PATCH RFC v4 15/20] intel_iommu: provide its own replay() callback, Peter Xu, 2017/01/22