intel_iommu: Enable PASID support for passthrough device

[RFC PATCH 14/14] intel_iommu: Expose flag VIOMMU_FLAG_PASID_SUPPORTED when configured

Zhenzhong Duan posted 14 patches 4 days, 11 hours ago

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Maintainers: Yi Liu <yi.l.liu@intel.com>, Eric Auger <eric.auger@redhat.com>, Zhenzhong Duan <zhenzhong.duan@intel.com>, "Michael S. Tsirkin" <mst@redhat.com>, Jason Wang <jasowang@redhat.com>, "Clément Mathieu--Drif" <clement.mathieu--drif@eviden.com>, Paolo Bonzini <pbonzini@redhat.com>, Richard Henderson <richard.henderson@linaro.org>, Eduardo Habkost <eduardo@habkost.net>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, Alex Williamson <alex@shazbot.org>, "Cédric Le Goater" <clg@redhat.com>

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[RFC PATCH 14/14] intel_iommu: Expose flag VIOMMU_FLAG_PASID_SUPPORTED when configured

Posted by Zhenzhong Duan 4 days, 11 hours ago

VFIO device will check flag VIOMMU_FLAG_PASID_SUPPORTED and expose PASID
capability, or else guest could not enable PASID of this device even if
vIOMMU's pasid is configured.

This is the final knob to enable PASID.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
 hw/i386/intel_iommu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 4ab50a9fd9..86998dad94 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -4727,6 +4727,7 @@ static uint64_t vtd_get_viommu_flags(void *opaque)
     uint64_t flags;
 
     flags = s->fsts ? VIOMMU_FLAG_WANT_NESTING_PARENT : 0;
+    flags |= s->pasid ? VIOMMU_FLAG_PASID_SUPPORTED : 0;
 
     return flags;
 }
-- 
2.47.3