Messages in this thread | | | Subject | Re: [RFC PATCH] xen/privcmd: Convert get_user_pages*() to pin_user_pages*() | From | Boris Ostrovsky <> | Date | Mon, 22 Jun 2020 15:10:53 -0400 |
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On 6/22/20 2:52 PM, Souptick Joarder wrote: > > I read the code again. I think, this check is needed to handle a scenario when > lock_pages() return -ENOSPC. Better to keep this check. Let me post v2 of this > RFC for a clear view.
Actually, error handling seems to be somewhat broken here. If lock_pages() returns number of pinned pages then that's what we end up returning from privcmd_ioctl_dm_op(), all the way to user ioctl(). Which I don't think is right, we should return proper (negative) error.
Do you mind fixing that we well? Then you should be able to avoid testing pages in a loop.
-boris
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