From: David Hildenbrand <david@redhat.com>
To: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Wanpeng Li <wanpengli@tencent.com>,
jun.nakajima@intel.com, kvm@vger.kernel.org,
qemu-devel@nongnu.org, "J . Bruce Fields" <bfields@fieldses.org>,
linux-mm@kvack.org, "H . Peter Anvin" <hpa@zytor.com>,
Chao Peng <chao.p.peng@linux.intel.com>,
ak@linux.intel.com, Jonathan Corbet <corbet@lwn.net>,
Joerg Roedel <joro@8bytes.org>,
x86@kernel.org, Hugh Dickins <hughd@google.com>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
luto@kernel.org, Thomas Gleixner <tglx@linutronix.de>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Jim Mattson <jmattson@google.com>,
dave.hansen@intel.com, Sean Christopherson <seanjc@google.com>,
susie.li@intel.com, Jeff Layton <jlayton@kernel.org>,
linux-kernel@vger.kernel.org, john.ji@intel.com,
Yu Zhang <yu.c.zhang@linux.intel.com>,
linux-fsdevel@vger.kernel.org,
Paolo Bonzini <pbonzini@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
Subject: Re: [RFC v2 PATCH 01/13] mm/shmem: Introduce F_SEAL_GUEST
Date: Mon, 22 Nov 2021 14:35:49 +0100 [thread overview]
Message-ID: <56c0dffc-5fc4-c337-3e85-a5c9ce619140@redhat.com> (raw)
In-Reply-To: <20211122133145.GQ876299@ziepe.ca>
On 22.11.21 14:31, Jason Gunthorpe wrote:
> On Mon, Nov 22, 2021 at 10:26:12AM +0100, David Hildenbrand wrote:
>
>> I do wonder if we want to support sharing such memfds between processes
>> in all cases ... we most certainly don't want to be able to share
>> encrypted memory between VMs (I heard that the kernel has to forbid
>> that). It would make sense in the use case you describe, though.
>
> If there is a F_SEAL_XX that blocks every kind of new access, who
> cares if userspace passes the FD around or not?
I was imagining that you actually would want to do some kind of "change
ownership". But yeah, the intended semantics and all use cases we have
in mind are not fully clear to me yet. If it's really "no new access"
(side note: is "access" the right word?) then sure, we can pass the fd
around.
--
Thanks,
David / dhildenb
next prev parent reply other threads:[~2021-11-22 13:42 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-19 13:47 [RFC v2 PATCH 00/13] KVM: mm: fd-based approach for supporting KVM guest private memory Chao Peng
2021-11-19 13:47 ` [RFC v2 PATCH 01/13] mm/shmem: Introduce F_SEAL_GUEST Chao Peng
2021-11-19 13:51 ` David Hildenbrand
2021-11-22 13:59 ` Kirill A. Shutemov
2021-11-19 15:19 ` Jason Gunthorpe
2021-11-19 15:39 ` David Hildenbrand
2021-11-19 16:00 ` Jason Gunthorpe
2021-11-22 9:26 ` David Hildenbrand
2021-11-22 13:31 ` Jason Gunthorpe
2021-11-22 13:35 ` David Hildenbrand [this message]
2021-11-22 14:01 ` Jason Gunthorpe
2021-11-22 14:57 ` David Hildenbrand
2021-11-22 15:09 ` Jason Gunthorpe
2021-11-22 15:15 ` David Hildenbrand
2021-11-19 19:18 ` Sean Christopherson
2021-11-19 19:47 ` Jason Gunthorpe
2021-11-19 22:21 ` Sean Christopherson
2021-11-19 23:33 ` Jason Gunthorpe
2021-11-20 1:23 ` Sean Christopherson
2021-11-21 0:05 ` Jason Gunthorpe
2021-11-23 9:06 ` Paolo Bonzini
2021-11-23 14:33 ` Chao Peng
2021-11-23 15:20 ` David Hildenbrand
2021-11-23 17:17 ` Jason Gunthorpe
2021-11-23 8:54 ` Paolo Bonzini
2021-12-03 1:11 ` Andy Lutomirski
2021-11-19 13:47 ` [RFC v2 PATCH 02/13] KVM: Add KVM_EXIT_MEMORY_ERROR exit Chao Peng
2021-11-19 13:47 ` [RFC v2 PATCH 03/13] KVM: Extend kvm_userspace_memory_region to support fd based memslot Chao Peng
2021-11-19 13:47 ` [RFC v2 PATCH 04/13] KVM: Add fd-based memslot data structure and utils Chao Peng
2021-11-23 8:41 ` Paolo Bonzini
2021-11-23 14:30 ` Chao Peng
2021-11-19 13:47 ` [RFC v2 PATCH 05/13] KVM: Implement fd-based memory using new memfd interfaces Chao Peng
2021-11-19 13:47 ` [RFC v2 PATCH 06/13] KVM: Register/unregister memfd backed memslot Chao Peng
2021-11-25 16:55 ` Steven Price
2021-11-19 13:47 ` [RFC v2 PATCH 07/13] KVM: Handle page fault for fd based memslot Chao Peng
2021-11-20 1:55 ` Yao Yuan
2021-11-22 9:18 ` Chao Peng
2021-11-19 13:47 ` [RFC v2 PATCH 08/13] KVM: Rename hva memory invalidation code to cover fd-based offset Chao Peng
2021-11-19 13:47 ` [RFC v2 PATCH 09/13] KVM: Introduce kvm_memfd_invalidate_range Chao Peng
2021-11-23 8:46 ` Paolo Bonzini
2021-11-23 14:24 ` Chao Peng
2021-11-19 13:47 ` [RFC v2 PATCH 10/13] KVM: Match inode for invalidation of fd-based slot Chao Peng
2021-11-19 13:47 ` [RFC v2 PATCH 11/13] KVM: Add kvm_map_gfn_range Chao Peng
2021-11-19 13:47 ` [RFC v2 PATCH 12/13] KVM: Introduce kvm_memfd_fallocate_range Chao Peng
2021-11-19 13:47 ` [RFC v2 PATCH 13/13] KVM: Enable memfd based page invalidation/fallocate Chao Peng
2021-11-22 14:16 ` Kirill A. Shutemov
2021-11-23 1:06 ` Chao Peng
2021-11-23 9:09 ` Paolo Bonzini
2021-11-23 15:00 ` Chao Peng
2021-11-23 8:51 ` Paolo Bonzini
2021-12-03 1:08 ` [RFC v2 PATCH 00/13] KVM: mm: fd-based approach for supporting KVM guest private memory Andy Lutomirski
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