Re: [PATCH] mm/hmm: fault non-owner device private entries

On Fri, 22 Jul 2022 15:56:32 -0700 Ralph Campbell rcampbell@nvidia.com wrote:

If hmm_range_fault() is called with the HMM_PFN_REQ_FAULT flag and a device private PTE is found, the hmm_range::dev_private_owner page is used to determine if the device private page should not be faulted in. However, if the device private page is not owned by the caller, hmm_range_fault() returns an error instead of calling migrate_to_ram() to fault in the page.

Could we please include here a description of the end-user visible effects of the bug?

Cc: stable@vger.kernel.org

Especially when proposing a -stable backport.