vfio/type1: introduce a new member has_rsvd for struct vfio_dma

Introduce a new member has_rsvd for struct vfio_dma. This member is
used to indicate whether there are any reserved or invalid pfns in
the region represented by this vfio_dma. If it is true, it indicates
that there is at least one pfn in this region that is either reserved
or invalid.

Signed-off-by: Li Zhe <lizhe.67@bytedance.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/r/20250814064714.56485-5-lizhe.67@bytedance.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index dbacd852efae1e56fe34b80811e2e6bb8fe0efe8..30e1b54f6c25f84f0171a39edd10159c9ea05592 100644 (file)
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -93,6 +93,7 @@ struct vfio_dma {
        bool                    iommu_mapped;
        bool                    lock_cap;       /* capable(CAP_IPC_LOCK) */
        bool                    vaddr_invalid;
+       bool                    has_rsvd;       /* has 1 or more rsvd pfns */
        struct task_struct      *task;
        struct rb_root          pfn_list;       /* Ex-user pinned pfn list */
        unsigned long           *bitmap;
@@ -782,6 +783,7 @@ static long vfio_pin_pages_remote(struct vfio_dma *dma, unsigned long vaddr,
        }
 
 out:
+       dma->has_rsvd |= rsvd;
        ret = vfio_lock_acct(dma, lock_acct, false);
 
 unpin_out: