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Re: [PATCH 0/3] Postcopy migration: Add userfaultfd- user-mode-only capa
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From: |
Peter Xu |
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Subject: |
Re: [PATCH 0/3] Postcopy migration: Add userfaultfd- user-mode-only capability |
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Date: |
Fri, 15 Oct 2021 07:43:37 +0800 |
On Thu, Oct 14, 2021 at 05:15:48PM +0800, Lin Ma wrote:
> Since kernel v5.11, Unprivileged user (without SYS_CAP_PTRACE capability)
> must pass UFFD_USER_MODE_ONLY to userfaultd in case unprivileged_userfaultfd
> sysctl knob is 0.
> Please refer to https://lwn.net/Articles/819834/ and the kernel commits:
> 37cd0575 userfaultfd: add UFFD_USER_MODE_ONLY
> d0d4730a userfaultfd: add user-mode only option to unprivileged_userfaultfd
> sysctl knob
>
> This patch set adds a migration capability to pass UFFD_USER_MODE_ONLY
> for postcopy migration.
Then it's at least no KVM, no vhost, am I right? Could I ask is there a real
user behind this? Thanks,
--
Peter Xu