From: Matthew Wilcox <willy@infradead.org>
To: David Laight <David.Laight@aculab.com>
Cc: 'James Bottomley' <James.Bottomley@hansenpartnership.com>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Steven Sistare <steven.sistare@oracle.com>,
Anthony Yznaga <anthony.yznaga@oracle.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
"mhocko@kernel.org" <mhocko@kernel.org>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"mingo@redhat.com" <mingo@redhat.com>,
"bp@alien8.de" <bp@alien8.de>, "x86@kernel.org" <x86@kernel.org>,
"hpa@zytor.com" <hpa@zytor.com>,
"viro@zeniv.linux.org.uk" <viro@zeniv.linux.org.uk>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
"arnd@arndb.de" <arnd@arndb.de>,
"keescook@chromium.org" <keescook@chromium.org>,
"gerg@linux-m68k.org" <gerg@linux-m68k.org>,
"ktkhai@virtuozzo.com" <ktkhai@virtuozzo.com>,
"christian.brauner@ubuntu.com" <christian.brauner@ubuntu.com>,
"peterz@infradead.org" <peterz@infradead.org>,
"esyr@redhat.com" <esyr@redhat.com>,
"jgg@ziepe.ca" <jgg@ziepe.ca>,
"christian@kellner.me" <christian@kellner.me>,
"areber@redhat.com" <areber@redhat.com>,
"cyphar@cyphar.com" <cyphar@cyphar.com>
Subject: Re: [RFC PATCH 0/5] madvise MADV_DOEXEC
Date: Tue, 4 Aug 2020 12:13:16 +0100 [thread overview]
Message-ID: <20200804111316.GE23808@casper.infradead.org> (raw)
In-Reply-To: <9371b8272fd84280ae40b409b260bab3@AcuMS.aculab.com>
On Tue, Aug 04, 2020 at 08:44:42AM +0000, David Laight wrote:
> From: James Bottomley
> > Sent: 03 August 2020 16:43
> >
> > On Mon, 2020-08-03 at 10:28 -0500, Eric W. Biederman wrote:
> > [...]
> > > What is wrong with live migration between one qemu process and
> > > another qemu process on the same machine not work for this use case?
> > >
> > > Just reusing live migration would seem to be the simplest path of
> > > all, as the code is already implemented. Further if something goes
> > > wrong with the live migration you can fallback to the existing
> > > process. With exec there is no fallback if the new version does not
> > > properly support the handoff protocol of the old version.
> >
> > Actually, could I ask this another way: the other patch set you sent to
> > the KVM list was to snapshot the VM to a PKRAM capsule preserved across
> > kexec using zero copy for extremely fast save/restore. The original
> > idea was to use this as part of a CRIU based snapshot, kexec to new
> > system, restore. However, why can't you do a local snapshot, restart
> > qemu, restore using the PKRAM capsule to achieve exactly the same as
> > MADV_DOEXEC does but using a system that's easy to reason about? It
> > may be slightly slower, but I think we're still talking milliseconds.
>
>
> I've had another idea (that is probably impossible...).
> What about a 'reverse mmap' operation.
> Something that creates an fd whose contents are a chunk of the
> processes address space.
http://www.wil.cx/~willy/linux/sileby.html
next prev parent reply other threads:[~2020-08-04 11:13 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-27 17:11 [RFC PATCH 0/5] madvise MADV_DOEXEC Anthony Yznaga
2020-07-27 17:07 ` Eric W. Biederman
2020-07-27 18:00 ` Steven Sistare
2020-07-28 13:40 ` Christian Brauner
2020-07-27 17:11 ` [RFC PATCH 1/5] elf: reintroduce using MAP_FIXED_NOREPLACE for elf executable mappings Anthony Yznaga
2020-07-27 17:11 ` [RFC PATCH 2/5] mm: do not assume only the stack vma exists in setup_arg_pages() Anthony Yznaga
2020-07-27 17:11 ` [RFC PATCH 3/5] mm: introduce VM_EXEC_KEEP Anthony Yznaga
2020-07-28 13:38 ` Eric W. Biederman
2020-07-28 17:44 ` Anthony Yznaga
2020-07-29 13:52 ` Kirill A. Shutemov
2020-07-29 23:20 ` Anthony Yznaga
2020-07-27 17:11 ` [RFC PATCH 4/5] exec, elf: require opt-in for accepting preserved mem Anthony Yznaga
2020-07-27 17:11 ` [RFC PATCH 5/5] mm: introduce MADV_DOEXEC Anthony Yznaga
2020-07-28 13:22 ` Kirill Tkhai
2020-07-28 14:06 ` Steven Sistare
2020-07-28 11:34 ` [RFC PATCH 0/5] madvise MADV_DOEXEC Kirill Tkhai
2020-07-28 17:28 ` Anthony Yznaga
2020-07-28 14:23 ` Andy Lutomirski
2020-07-28 14:30 ` Steven Sistare
2020-07-30 15:22 ` Matthew Wilcox
2020-07-30 15:27 ` Christian Brauner
2020-07-30 15:34 ` Matthew Wilcox
2020-07-30 15:54 ` Christian Brauner
2020-07-31 9:12 ` Stefan Hajnoczi
2020-07-30 15:59 ` Steven Sistare
2020-07-30 17:12 ` Matthew Wilcox
2020-07-30 17:35 ` Steven Sistare
2020-07-30 17:49 ` Matthew Wilcox
2020-07-30 18:27 ` Steven Sistare
2020-07-30 21:58 ` Eric W. Biederman
2020-07-31 14:57 ` Steven Sistare
2020-07-31 15:27 ` Matthew Wilcox
2020-07-31 16:11 ` Steven Sistare
2020-07-31 16:56 ` Jason Gunthorpe
2020-07-31 17:15 ` Steven Sistare
2020-07-31 17:48 ` Jason Gunthorpe
2020-07-31 17:55 ` Steven Sistare
2020-07-31 17:23 ` Matthew Wilcox
2020-08-03 15:28 ` Eric W. Biederman
2020-08-03 15:42 ` James Bottomley
2020-08-03 20:03 ` Steven Sistare
[not found] ` <9371b8272fd84280ae40b409b260bab3@AcuMS.aculab.com>
2020-08-04 11:13 ` Matthew Wilcox [this message]
2020-08-03 19:29 ` Steven Sistare
2020-07-31 19:41 ` Steven Sistare
2021-07-08 9:52 ` Longpeng (Mike, Cloud Infrastructure Service Product Dept.)
2021-07-08 12:48 ` Steven Sistare
2021-07-12 1:05 ` Longpeng (Mike, Cloud Infrastructure Service Product Dept.)
2021-07-12 1:30 ` Matthew Wilcox
2021-07-13 0:57 ` Longpeng (Mike, Cloud Infrastructure Service Product Dept.)
2021-08-13 19:49 ` Khalid Aziz
2021-08-14 20:07 ` David Laight
2021-08-16 0:26 ` Longpeng (Mike, Cloud Infrastructure Service Product Dept.)
2021-08-16 8:07 ` David Laight
2021-08-16 6:54 ` Longpeng (Mike, Cloud Infrastructure Service Product Dept.)
2021-08-16 8:02 ` David Hildenbrand
2021-08-16 12:07 ` Matthew Wilcox
2021-08-16 12:20 ` David Hildenbrand
2021-08-16 12:42 ` David Hildenbrand
2021-08-16 12:46 ` Matthew Wilcox
2021-08-16 13:24 ` David Hildenbrand
2021-08-16 13:32 ` Matthew Wilcox
2021-08-16 14:10 ` David Hildenbrand
2021-08-16 14:27 ` Matthew Wilcox
2021-08-16 14:33 ` David Hildenbrand
2021-08-16 14:40 ` Matthew Wilcox
2021-08-16 15:01 ` David Hildenbrand
2021-08-16 15:59 ` Matthew Wilcox
2021-08-16 16:06 ` Khalid Aziz
2021-08-16 16:15 ` Matthew Wilcox
2021-08-16 16:13 ` David Hildenbrand
2021-08-16 12:27 ` [private] " David Hildenbrand
2021-08-16 12:30 ` David Hildenbrand
2021-08-17 0:47 ` Longpeng (Mike, Cloud Infrastructure Service Product Dept.)
2021-08-17 0:55 ` Matthew Wilcox
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200804111316.GE23808@casper.infradead.org \
--to=willy@infradead.org \
--cc=David.Laight@aculab.com \
--cc=James.Bottomley@hansenpartnership.com \
--cc=akpm@linux-foundation.org \
--cc=anthony.yznaga@oracle.com \
--cc=areber@redhat.com \
--cc=arnd@arndb.de \
--cc=bp@alien8.de \
--cc=christian.brauner@ubuntu.com \
--cc=christian@kellner.me \
--cc=cyphar@cyphar.com \
--cc=ebiederm@xmission.com \
--cc=esyr@redhat.com \
--cc=gerg@linux-m68k.org \
--cc=hpa@zytor.com \
--cc=jgg@ziepe.ca \
--cc=keescook@chromium.org \
--cc=ktkhai@virtuozzo.com \
--cc=linux-arch@vger.kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mhocko@kernel.org \
--cc=mingo@redhat.com \
--cc=peterz@infradead.org \
--cc=steven.sistare@oracle.com \
--cc=tglx@linutronix.de \
--cc=viro@zeniv.linux.org.uk \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).