mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-10-26 10:57:38 +08:00
Yu Zhang
87c5e5ae83
Add page-selective IOTLB flush using HVCALL_FLUSH_DEVICE_DOMAIN_LIST. This hypercall accepts a list of (page_number, page_mask_shift) entries, enabling finer-grained IOTLB invalidation compared to the domain-wide HVCALL_FLUSH_DEVICE_DOMAIN used by hv_iommu_flush_iotlb_all(). hv_iommu_calc_flush_range() computes the smallest power-of-two aligned range that covers the target IOVA region, producing a single flush descriptor. This may over-flush when the range is not naturally aligned, matching the approach used by Intel VT-d PSI. If the page-selective flush fails, the code falls back to a full domain flush. Signed-off-by: Easwar Hariharan <easwar.hariharan@linux.microsoft.com> Signed-off-by: Yu Zhang <zhangyu1@linux.microsoft.com> Reviewed-by: Jacob Pan <jacob.pan@linux.microsoft.com> Reviewed-by: Michael Kelley <mhklinux@outlook.com> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>