From: Jason Gunthorpe <jgg@ziepe.ca>
To: David Hildenbrand <david@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>,
Andy Lutomirski <luto@kernel.org>,
Chao Peng <chao.p.peng@linux.intel.com>,
kvm list <kvm@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
Linux API <linux-api@vger.kernel.org>,
qemu-devel@nongnu.org, Paolo Bonzini <pbonzini@redhat.com>,
Jonathan Corbet <corbet@lwn.net>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
the arch/x86 maintainers <x86@kernel.org>,
"H. Peter Anvin" <hpa@zytor.com>, Hugh Dickins <hughd@google.com>,
Jeff Layton <jlayton@kernel.org>,
"J . Bruce Fields" <bfields@fieldses.org>,
Andrew Morton <akpm@linux-foundation.org>,
Mike Rapoport <rppt@kernel.org>,
Steven Price <steven.price@arm.com>,
"Maciej S . Szmigiero" <mail@maciej.szmigiero.name>,
Vlastimil Babka <vbabka@suse.cz>,
Vishal Annapurve <vannapurve@google.com>,
Yu Zhang <yu.c.zhang@linux.intel.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
"Nakajima, Jun" <jun.nakajima@intel.com>,
Dave Hansen <dave.hansen@intel.com>,
Andi Kleen <ak@linux.intel.com>
Subject: Re: [PATCH v5 04/13] mm/shmem: Restrict MFD_INACCESSIBLE memory against RLIMIT_MEMLOCK
Date: Tue, 12 Apr 2022 11:36:36 -0300 [thread overview]
Message-ID: <20220412143636.GG64706@ziepe.ca> (raw)
In-Reply-To: <7ab689e7-e04d-5693-f899-d2d785b09892@redhat.com>
On Fri, Apr 08, 2022 at 08:54:02PM +0200, David Hildenbrand wrote:
> RLIMIT_MEMLOCK was the obvious candidate, but as we discovered int he
> past already with secretmem, it's not 100% that good of a fit (unmovable
> is worth than mlocked). But it gets the job done for now at least.
No, it doesn't. There are too many different interpretations how
MELOCK is supposed to work
eg VFIO accounts per-process so hostile users can just fork to go past
it.
RDMA is per-process but uses a different counter, so you can double up
iouring is per-user and users a 3rd counter, so it can triple up on
the above two
> So I'm open for alternative to limit the amount of unmovable memory we
> might allocate for user space, and then we could convert seretmem as well.
I think it has to be cgroup based considering where we are now :\
Jason
next prev parent reply other threads:[~2022-04-12 14:36 UTC|newest]
Thread overview: 118+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-10 14:08 [PATCH v5 00/13] KVM: mm: fd-based approach for supporting KVM guest private memory Chao Peng
2022-03-10 14:08 ` [PATCH v5 01/13] mm/memfd: Introduce MFD_INACCESSIBLE flag Chao Peng
2022-04-11 15:10 ` Kirill A. Shutemov
2022-04-12 13:11 ` Chao Peng
2022-04-23 5:43 ` Vishal Annapurve
2022-04-24 8:15 ` Chao Peng
2022-03-10 14:09 ` [PATCH v5 02/13] mm: Introduce memfile_notifier Chao Peng
2022-03-29 18:45 ` Sean Christopherson
2022-04-08 12:54 ` Chao Peng
2022-04-12 14:36 ` Hillf Danton
2022-04-13 6:47 ` Chao Peng
2022-03-10 14:09 ` [PATCH v5 03/13] mm/shmem: Support memfile_notifier Chao Peng
2022-03-10 23:08 ` Dave Chinner
2022-03-11 8:42 ` Chao Peng
2022-04-11 15:26 ` Kirill A. Shutemov
2022-04-12 13:12 ` Chao Peng
2022-04-19 22:40 ` Vishal Annapurve
2022-04-20 3:24 ` Chao Peng
2022-03-10 14:09 ` [PATCH v5 04/13] mm/shmem: Restrict MFD_INACCESSIBLE memory against RLIMIT_MEMLOCK Chao Peng
2022-04-07 16:05 ` Sean Christopherson
2022-04-07 17:09 ` Andy Lutomirski
2022-04-08 17:56 ` Sean Christopherson
2022-04-08 18:54 ` David Hildenbrand
2022-04-12 14:36 ` Jason Gunthorpe [this message]
2022-04-12 21:27 ` Andy Lutomirski
2022-04-13 16:30 ` David Hildenbrand
2022-04-13 16:24 ` David Hildenbrand
2022-04-13 17:52 ` Jason Gunthorpe
2022-04-25 14:07 ` David Hildenbrand
2022-04-08 13:02 ` Chao Peng
2022-04-11 15:34 ` Kirill A. Shutemov
2022-04-12 5:14 ` Hugh Dickins
2022-04-11 15:32 ` Kirill A. Shutemov
2022-04-12 13:39 ` Chao Peng
2022-04-12 19:28 ` Kirill A. Shutemov
2022-04-13 9:15 ` Chao Peng
2022-03-10 14:09 ` [PATCH v5 05/13] KVM: Extend the memslot to support fd-based private memory Chao Peng
2022-03-28 21:27 ` Sean Christopherson
2022-04-08 13:21 ` Chao Peng
2022-03-28 21:56 ` Sean Christopherson
2022-04-08 13:46 ` Chao Peng
2022-04-08 17:45 ` Sean Christopherson
2022-03-10 14:09 ` [PATCH v5 06/13] KVM: Use kvm_userspace_memory_region_ext Chao Peng
2022-03-28 22:26 ` Sean Christopherson
2022-04-08 13:58 ` Chao Peng
2022-03-10 14:09 ` [PATCH v5 07/13] KVM: Add KVM_EXIT_MEMORY_ERROR exit Chao Peng
2022-03-28 22:33 ` Sean Christopherson
2022-04-08 13:59 ` Chao Peng
2022-03-10 14:09 ` [PATCH v5 08/13] KVM: Use memfile_pfn_ops to obtain pfn for private pages Chao Peng
2022-03-28 23:56 ` Sean Christopherson
2022-04-08 14:07 ` Chao Peng
2022-04-28 12:37 ` Chao Peng
2022-03-10 14:09 ` [PATCH v5 09/13] KVM: Handle page fault for private memory Chao Peng
2022-03-29 1:07 ` Sean Christopherson
2022-04-12 12:10 ` Chao Peng
2022-03-10 14:09 ` [PATCH v5 10/13] KVM: Register private memslot to memory backing store Chao Peng
2022-03-29 19:01 ` Sean Christopherson
2022-04-12 12:40 ` Chao Peng
2022-03-10 14:09 ` [PATCH v5 11/13] KVM: Zap existing KVM mappings when pages changed in the private fd Chao Peng
2022-03-29 19:23 ` Sean Christopherson
2022-04-12 12:43 ` Chao Peng
2022-04-05 23:45 ` Michael Roth
2022-04-08 3:06 ` Sean Christopherson
2022-04-19 22:43 ` Vishal Annapurve
2022-04-20 3:17 ` Chao Peng
2022-03-10 14:09 ` [PATCH v5 12/13] KVM: Expose KVM_MEM_PRIVATE Chao Peng
2022-03-29 19:13 ` Sean Christopherson
2022-04-12 12:56 ` Chao Peng
2022-03-10 14:09 ` [PATCH v5 13/13] memfd_create.2: Describe MFD_INACCESSIBLE flag Chao Peng
2022-03-24 15:51 ` [PATCH v5 00/13] KVM: mm: fd-based approach for supporting KVM guest private memory Quentin Perret
2022-03-28 17:13 ` Sean Christopherson
2022-03-28 18:00 ` Quentin Perret
2022-03-28 18:58 ` Sean Christopherson
2022-03-29 17:01 ` Quentin Perret
2022-03-30 8:58 ` Steven Price
2022-03-30 10:39 ` Quentin Perret
2022-03-30 17:58 ` Sean Christopherson
2022-03-31 16:04 ` Andy Lutomirski
2022-04-01 14:59 ` Quentin Perret
2022-04-01 17:14 ` Sean Christopherson
2022-04-01 18:03 ` Quentin Perret
2022-04-01 18:24 ` Sean Christopherson
2022-04-01 19:56 ` Andy Lutomirski
2022-04-04 15:01 ` Quentin Perret
2022-04-04 17:06 ` Sean Christopherson
2022-04-04 22:04 ` Andy Lutomirski
2022-04-05 10:36 ` Quentin Perret
2022-04-05 17:51 ` Andy Lutomirski
2022-04-05 18:30 ` Sean Christopherson
2022-04-06 18:42 ` Andy Lutomirski
2022-04-06 13:05 ` Quentin Perret
2022-04-05 18:03 ` Sean Christopherson
2022-04-06 10:34 ` Quentin Perret
2022-04-22 10:56 ` Chao Peng
2022-04-22 11:06 ` Paolo Bonzini
2022-04-24 8:07 ` Chao Peng
2022-04-24 16:59 ` Andy Lutomirski
2022-04-25 13:40 ` Chao Peng
2022-04-25 14:52 ` Andy Lutomirski
2022-04-25 20:30 ` Sean Christopherson
2022-06-10 19:18 ` Andy Lutomirski
2022-06-10 19:27 ` Sean Christopherson
2022-04-28 12:29 ` Chao Peng
2022-05-03 11:12 ` Quentin Perret
2022-05-09 22:30 ` Michael Roth
2022-05-09 23:29 ` Sean Christopherson
2022-07-21 20:05 ` Gupta, Pankaj
2022-07-21 21:19 ` Sean Christopherson
2022-07-21 21:36 ` Gupta, Pankaj
2022-07-23 3:09 ` Andy Lutomirski
2022-07-25 9:19 ` Gupta, Pankaj
2022-03-30 16:18 ` Sean Christopherson
2022-03-28 20:16 ` Andy Lutomirski
2022-03-28 22:48 ` Nakajima, Jun
2022-03-29 0:04 ` Sean Christopherson
2022-04-08 21:35 ` Vishal Annapurve
2022-04-12 13:00 ` Chao Peng
2022-04-12 19:58 ` Kirill A. Shutemov
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