iommu/x86: Add architectural MSI reserved region helper

Intel and AMD IOMMU drivers both reserve the x86 architectural MSI
address window from normal IOVA mappings, but each open-codes the range,
allocation attributes, and insertion into the reserved-region list.

Add iommu_add_resv_x86_msi_region() to encapsulate those operations, and
convert the Intel and AMD drivers to use it. Return an error on allocation
failure so callers can preserve their existing error paths.

Signed-off-by: Yu Zhang <zhangyu1@linux.microsoft.com>
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

0 files changed, 0 insertions, 0 deletions