Revert "vfio/type1: Improve memory pinning process for raw PFN mapping"

Bisection by Amadeusz Sławiński implicates this commit leading to bad
page state issues after VM shutdown, likely due to unbalanced page
references.  The original commit was intended only as a performance
improvement, therefore revert for offline rework.

Link: https://lkml.org/lkml/2018/6/2/97
Fixes: 356e88ebe447 ("vfio/type1: Improve memory pinning process for raw PFN mapping")
Cc: Jason Cai (Xiang Feng) <jason.cai@linux.alibaba.com>
Reported-by: Amadeusz Sławiński <amade@asmblr.net>
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 5c212bf29640d8bee4f069e6ec720e41587b34ba..3c082451ab1a00da8577978a61276c0341930e3d 100644 (file)
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -404,6 +404,7 @@ static long vfio_pin_pages_remote(struct vfio_dma *dma, unsigned long vaddr,
 {
        unsigned long pfn = 0;
        long ret, pinned = 0, lock_acct = 0;
+       bool rsvd;
        dma_addr_t iova = vaddr - dma->vaddr + dma->iova;
 
        /* This code path is only user initiated */
@@ -414,23 +415,14 @@ static long vfio_pin_pages_remote(struct vfio_dma *dma, unsigned long vaddr,
        if (ret)
                return ret;
 
-       if (is_invalid_reserved_pfn(*pfn_base)) {
-               struct vm_area_struct *vma;
-
-               down_read(&current->mm->mmap_sem);
-               vma = find_vma_intersection(current->mm, vaddr, vaddr + 1);
-               pinned = min_t(long, npage, vma_pages(vma));
-               up_read(&current->mm->mmap_sem);
-               return pinned;
-       }
-
        pinned++;
+       rsvd = is_invalid_reserved_pfn(*pfn_base);
 
        /*
         * Reserved pages aren't counted against the user, externally pinned
         * pages are already counted against the user.
         */
-       if (!vfio_find_vpfn(dma, iova)) {
+       if (!rsvd && !vfio_find_vpfn(dma, iova)) {
                if (!lock_cap && current->mm->locked_vm + 1 > limit) {
                        put_pfn(*pfn_base, dma->prot);
                        pr_warn("%s: RLIMIT_MEMLOCK (%ld) exceeded\n", __func__,
@@ -450,12 +442,13 @@ static long vfio_pin_pages_remote(struct vfio_dma *dma, unsigned long vaddr,
                if (ret)
                        break;
 
-               if (pfn != *pfn_base + pinned) {
+               if (pfn != *pfn_base + pinned ||
+                   rsvd != is_invalid_reserved_pfn(pfn)) {
                        put_pfn(pfn, dma->prot);
                        break;
                }
 
-               if (!vfio_find_vpfn(dma, iova)) {
+               if (!rsvd && !vfio_find_vpfn(dma, iova)) {
                        if (!lock_cap &&
                            current->mm->locked_vm + lock_acct + 1 > limit) {
                                put_pfn(pfn, dma->prot);
@@ -473,8 +466,10 @@ out:
 
 unpin_out:
        if (ret) {
-               for (pfn = *pfn_base ; pinned ; pfn++, pinned--)
-                       put_pfn(pfn, dma->prot);
+               if (!rsvd) {
+                       for (pfn = *pfn_base ; pinned ; pfn++, pinned--)
+                               put_pfn(pfn, dma->prot);
+               }
 
                return ret;
        }