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virt: acrn: stop using follow_pfn

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Patch series "remove follow_pfn".

This series open codes follow_pfn in the only remaining caller, although
the code there remains questionable.  It then also moves follow_phys into
the only user and simplifies it a bit.


This patch (of 3):

Switch from follow_pfn to follow_pte so that we can get rid of follow_pfn.
Note that this doesn't fix any of the pre-existing raciness and lack of
permission checking in the code.

Link: https://lkml.kernel.org/r/20240324234542.2038726-1-hch@lst.de
Link: https://lkml.kernel.org/r/20240324234542.2038726-2-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fei Li <fei1.li@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Christoph Hellwig 2024-03-25 07:45:40 +08:00 committed by Andrew Morton
parent 85109a8a9a
commit 1b265da7ea
1 changed files with 8 additions and 2 deletions
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10
drivers/virt/acrn/mm.c
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@ -172,18 +172,24 @@ int acrn_vm_ram_map(struct acrn_vm *vm, struct acrn_vm_memmap *memmap)
mmap_read_lock(current->mm);
vma = vma_lookup(current->mm, memmap->vma_base);
if (vma && ((vma->vm_flags & VM_PFNMAP) != 0)) {
spinlock_t *ptl;
pte_t *ptep;
if ((memmap->vma_base + memmap->len) > vma->vm_end) {
mmap_read_unlock(current->mm);
return -EINVAL;
}
ret = follow_pfn(vma, memmap->vma_base, &pfn);
mmap_read_unlock(current->mm);
ret = follow_pte(vma->vm_mm, memmap->vma_base, &ptep, &ptl);
if (ret < 0) {
mmap_read_unlock(current->mm);
dev_dbg(acrn_dev.this_device,
"Failed to lookup PFN at VMA:%pK.\n", (void *)memmap->vma_base);
return ret;
}
pfn = pte_pfn(ptep_get(ptep));
pte_unmap_unlock(ptep, ptl);
mmap_read_unlock(current->mm);
return acrn_mm_region_add(vm, memmap->user_vm_pa,
PFN_PHYS(pfn), memmap->len,