diff options
| author | Jacob Pan <jacob.jun.pan@linux.intel.com> | 2020-05-16 14:20:51 +0800 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2020-05-18 15:37:25 +0200 |
| commit | 3375303e82877552f3b2b42309e8233fe715fd9f (patch) | |
| tree | 73ae1b229a5e05e01b2754c8464504add1912cfc /drivers/iommu/dmar.c | |
| parent | 24f27d32ab6b71dedcbbeeab8f9bdc143b539ac0 (diff) | |
iommu/vt-d: Add custom allocator for IOASID
When VT-d driver runs in the guest, PASID allocation must be
performed via virtual command interface. This patch registers a
custom IOASID allocator which takes precedence over the default
XArray based allocator. The resulting IOASID allocation will always
come from the host. This ensures that PASID namespace is system-
wide.
Virtual command registers are used in the guest only, to prevent
vmexit cost, we cache the capability and store it during initialization.
Signed-off-by: Liu, Yi L <yi.l.liu@intel.com>
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Link: https://lore.kernel.org/r/20200516062101.29541-9-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/dmar.c')
| -rw-r--r-- | drivers/iommu/dmar.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c index 34ee8f28555f..66af08ad10fb 100644 --- a/drivers/iommu/dmar.c +++ b/drivers/iommu/dmar.c @@ -963,6 +963,7 @@ static int map_iommu(struct intel_iommu *iommu, u64 phys_addr) warn_invalid_dmar(phys_addr, " returns all ones"); goto unmap; } + iommu->vccap = dmar_readq(iommu->reg + DMAR_VCCAP_REG); /* the registers might be more than one page */ map_size = max_t(int, ecap_max_iotlb_offset(iommu->ecap), |