From: Peter Xu <peterx@redhat.com>
To: Lin Ma <lma@suse.com>
Cc: qemu-devel@nongnu.org, dgilbert@redhat.com, quintela@redhat.com
Subject: Re: [PATCH 0/3] Postcopy migration: Add userfaultfd- user-mode-only capability
Date: Fri, 15 Oct 2021 07:43:37 +0800 [thread overview]
Message-ID: <YWjAqX13PYhBgbVh@t490s> (raw)
In-Reply-To: <20211014091551.15201-1-lma@suse.com>
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
next prev parent reply other threads:[~2021-10-14 23:47 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-14 9:15 [PATCH 0/3] Postcopy migration: Add userfaultfd- user-mode-only capability Lin Ma
2021-10-14 9:15 ` [PATCH 1/3] migration: introduce postcopy-uffd-usermode-only capability Lin Ma
2021-10-14 9:15 ` [PATCH 2/3] migration: postcopy-uffd-usermode-only documentation Lin Ma
2021-10-14 9:15 ` [PATCH 3/3] tests: add postcopy-uffd-usermode-only capability into migration-test Lin Ma
2021-10-14 23:43 ` Peter Xu [this message]
2021-10-15 5:38 ` [PATCH 0/3] Postcopy migration: Add userfaultfd- user-mode-only capability lma
2021-10-15 6:12 ` Peter Xu
2021-10-15 8:16 ` lma
2021-10-15 8:28 ` Peter Xu
2021-10-15 9:49 ` lma
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