[PATCH] powerpc/book3s_hv_uvmem: Check for failed page migration
Alistair Popple
alistair at popple.id.au
Mon Dec 7 10:55:49 AEDT 2020
On Friday, 4 December 2020 9:18:41 PM AEDT Bharata B Rao wrote:
>
> Reviewed-by: Bharata B Rao <bharata at linux.ibm.com>
>
> Did you actually hit this scenario with secure VMs where a UV-paged-in
> page was later found to be not migratable?
No, this was found by inspection. I have no way of testing this but we had a
similar issue in Nouveau and I think you would have a similar issue here
although it might be hard to hit.
migrate_vma_pages() will fail a page migration if a CPU thread has raced and
established a non-zero page PTE for the address. See migrate_vma_insert_page()
for the implementation. It will also fail if something else has taken a
reference on the page after calling migrate_vma_setup(), but that is less
likely as any existing pages will have been isolated.
- Alistair
> Regards,
> Bharata.
>
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