[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [v8][PATCH 15/17] xen:vtd: create RMRR mapping
> From: Chen, Tiejun > Sent: Monday, December 01, 2014 5:25 PM > > intel_iommu_map_page() does nothing if VT-d shares EPT page table. > So rmrr_identity_mapping() never create RMRR mapping but in some > cases like some GFX drivers it still need to access RMRR. > > Here we will create those RMRR mappings even in shared EPT case. > > Signed-off-by: Tiejun Chen <tiejun.chen@xxxxxxxxx> Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx> > --- > xen/drivers/passthrough/vtd/iommu.c | 13 +++++++++---- > 1 file changed, 9 insertions(+), 4 deletions(-) > > diff --git a/xen/drivers/passthrough/vtd/iommu.c > b/xen/drivers/passthrough/vtd/iommu.c > index a38f201..a54c6eb 100644 > --- a/xen/drivers/passthrough/vtd/iommu.c > +++ b/xen/drivers/passthrough/vtd/iommu.c > @@ -1856,10 +1856,15 @@ static int rmrr_identity_mapping(struct domain > *d, bool_t map, > > while ( base_pfn < end_pfn ) > { > - int err = intel_iommu_map_page(d, base_pfn, base_pfn, > - > IOMMUF_readable|IOMMUF_writable); > - > - if ( err ) > + int err = 0; > + if ( iommu_use_hap_pt(d) ) > + { > + ASSERT(!iommu_passthrough || !is_hardware_domain(d)); > + if ( (err = set_identity_p2m_entry(d, base_pfn, > p2m_access_rw)) ) > + return err; > + } > + else if ( (err = intel_iommu_map_page(d, base_pfn, base_pfn, > + IOMMUF_readable|IOMMUF_writable)) > ) > return err; > base_pfn++; > } > -- > 1.9.1 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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