Re: [Qemu-devel] [PATCH v6 16/18] intel_iommu: do replay when context invalidate

[Peter Xu <peterx@redhat.com>]

On Tue, Feb 07, 2017 at 02:16:15PM +0800, Jason Wang wrote:
> 
> 
> On 2017年02月03日 16:22, 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 <peterx@redhat.com>
> >---
> >  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 0a42c01..363227d 100644
> >--- a/hw/i386/intel_iommu.c
> >+++ b/hw/i386/intel_iommu.c
> >@@ -1115,6 +1115,16 @@ 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);
> >              }
> >          }
> >      }
> 
> Reviewed-by: Jason Wang <jasowang@redhat.com>
> 
> We may consider to squash this into patch 18.

I can do it. Thanks,

-- peterx