From: Sean Christopherson <seanjc@google.com>
To: Tarun Sahu <tarunsahu@google.com>
Cc: ackerleytng@google.com, fuad.tabba@linux.dev,
Andrew Morton <akpm@linux-foundation.org>,
dmatlack@google.com, Shuah Khan <skhan@linuxfoundation.org>,
Jonathan Corbet <corbet@lwn.net>,
david@redhat.com, Pasha Tatashin <pasha.tatashin@soleen.com>,
Pratyush Yadav <pratyush@kernel.org>,
sagis@google.com, Paolo Bonzini <pbonzini@redhat.com>,
Mike Rapoport <rppt@kernel.org>, Alexander Graf <graf@amazon.com>,
linux-kselftest@vger.kernel.org, andre.przywara@arm.com,
michael.roth@amd.com, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, will@kernel.org, vannapurve@google.com,
maz@kernel.org, fvdl@google.com, kvm@vger.kernel.org,
oliver.upton@linux.dev, kvmarm@lists.linux.dev,
alexandru.elisei@arm.com, skhawaja@google.com,
aneesh.kumar@kernel.org, linux-doc@vger.kernel.org,
David Hildenbrand <david@kernel.org>,
yan.y.zhao@intel.com, kexec@lists.infradead.org,
suzuki.poulose@arm.com
Subject: Re: [PATCH v4 04/11] KVM: Track weak reference to vm_file in struct kvm
Date: Mon, 10 Aug 2026 16:23:12 -0700 [thread overview]
Message-ID: <anpdYD1UaO0ffQgi@google.com> (raw)
In-Reply-To: <20260728121138.1103610-5-tarunsahu@google.com>
On Tue, Jul 28, 2026, Tarun Sahu wrote:
> - Add a weak reference 'vm_file' in struct kvm under
"vm_file" is effectively already claimed by vm_area_struct.vm_file. *If* we go
this route, I would very strongly prefer to take a dependency on "vfio: Use
file-based reference counting for KVM"[*]. I'll poke that thread, we really
should land that one particular patch long before the s390-is-arm64 insanity.
Empashish on "if" because this all feels backwards. It's not at all clear to
me why liveupdate goes directly to guest_memfd, but then requires a token associated
with the VM.
https://lore.kernel.org/all/20260731130902.654679-2-seiden@linux.ibm.com
next prev parent reply other threads:[~2026-08-10 23:23 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-28 12:11 [PATCH v4 00/11] liveupdate: kvm: Guest_memfd preservation Tarun Sahu
2026-07-28 12:11 ` [PATCH v4 01/11] liveupdate: Add LIVEUPDATE_GUEST_MEMFD config option Tarun Sahu
2026-07-28 12:22 ` sashiko-bot
2026-07-30 18:06 ` Ackerley Tng
2026-08-10 10:13 ` tarunsahu
2026-08-10 22:58 ` Sean Christopherson
2026-07-28 12:11 ` [PATCH v4 02/11] KVM: Introduce kvm_create_vm_file() helper Tarun Sahu
2026-07-30 17:36 ` Ackerley Tng
2026-08-10 10:14 ` tarunsahu
2026-08-10 23:05 ` Sean Christopherson
2026-07-28 12:11 ` [PATCH v4 03/11] KVM: Export kvm_uevent_notify_vm_create() Tarun Sahu
2026-07-28 12:26 ` sashiko-bot
2026-07-30 17:43 ` Ackerley Tng
2026-08-06 1:14 ` Sean Christopherson
2026-08-10 12:55 ` tarunsahu
2026-07-28 12:11 ` [PATCH v4 04/11] KVM: Track weak reference to vm_file in struct kvm Tarun Sahu
2026-08-10 23:23 ` Sean Christopherson [this message]
2026-07-28 12:11 ` [PATCH v4 05/11] KVM: LUO: Support VM preservation across live updates Tarun Sahu
2026-07-28 12:27 ` sashiko-bot
2026-08-10 23:42 ` Sean Christopherson
2026-07-28 12:11 ` [PATCH v4 06/11] KVM: guest_memfd: Move internal definitions to internal header Tarun Sahu
2026-07-30 18:12 ` Ackerley Tng
2026-07-28 12:11 ` [PATCH v4 07/11] KVM: guest_memfd: Add support for freezing mappings Tarun Sahu
2026-07-28 12:20 ` sashiko-bot
2026-07-30 17:46 ` Ackerley Tng
2026-08-10 13:15 ` tarunsahu
2026-07-30 18:12 ` Ackerley Tng
2026-08-10 13:08 ` tarunsahu
2026-08-10 23:44 ` Sean Christopherson
2026-07-28 12:11 ` [PATCH v4 08/11] KVM: guest_memfd: Add support for preservation via LUO Tarun Sahu
2026-07-28 12:23 ` sashiko-bot
2026-07-30 18:16 ` Ackerley Tng
2026-08-10 13:20 ` tarunsahu
2026-07-28 12:11 ` [PATCH v4 09/11] docs: liveupdate: Add documentation for VM and guest_memfd preservation Tarun Sahu
2026-07-28 12:21 ` sashiko-bot
2026-08-10 13:21 ` tarunsahu
2026-07-28 12:11 ` [PATCH v4 10/11] KVM: selftests: Split ____vm_create() and add vm_create_from_fd() Tarun Sahu
2026-07-28 12:11 ` [PATCH v4 11/11] KVM: selftests: Add guest_memfd_preservation_test Tarun Sahu
2026-07-30 18:18 ` Ackerley Tng
2026-08-10 13:22 ` tarunsahu
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