From: Gregory Price <gourry@gourry.net>
To: Ackerley Tng <ackerleytng@google.com>
Cc: Hugh Dickins <hughd@google.com>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
Andrew Morton <akpm@linux-foundation.org>,
Sean Christopherson <seanjc@google.com>,
Paolo Bonzini <pbonzini@redhat.com>,
David Hildenbrand <david@kernel.org>,
Jonathan Corbet <corbet@lwn.net>,
Shuah Khan <skhan@linuxfoundation.org>,
Randy Dunlap <rdunlap@infradead.org>,
Shuah Khan <shuah@kernel.org>,
vannapurve@google.com, erdemaktas@google.com, jxgao@google.com,
rientjes@google.com, fvdl@google.com, jthoughton@google.com,
tarunsahu@google.com, pratyush@kernel.org, fuad.tabba@linux.dev,
David Woodhouse <dwmw2@infradead.org>,
yan.y.zhao@intel.com, michael.roth@amd.com,
suzuki.poulose@arm.com, Christian Brauner <brauner@kernel.org>,
Jason Gunthorpe <jgg@ziepe.ca>,
Nicolin Chen <nicolinc@nvidia.com>,
Xu Yilun <yilun.xu@linux.intel.com>,
aik@amd.com, aneesh.kumar@kernel.org,
Vlastimil Babka <vbabka@kernel.org>,
kernel-team@android.com, kernel-team@meta.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
kvm@vger.kernel.org, linux-doc@vger.kernel.org,
linux-kselftest@vger.kernel.org
Subject: Re: [PATCH RFC 00/17] Allow guest_memfd to be created using a resource (pool) fd
Date: Thu, 1 Oct 2026 09:43:42 -0400 [thread overview]
Message-ID: <ar5iaaLcyz9dCXQI@gourry-fedora-PF4VCD3F> (raw)
In-Reply-To: <20260925-gmem-tmpfs-backend-v1-0-d36159822d18@google.com>
On Fri, Sep 25, 2026 at 05:50:47PM -0700, Ackerley Tng wrote:
> + e.g. for tmpfs,
> + Use mount page size.
> + Respect mount size limits.
> + Use guest_memfd mpol and fall back to mount mpol.
> + Gregory, now you can set mpol upfront on a mount! [3])
I haven't had time to quite give this the read it deserves yet (have
been traveling this past week), but I think this mpol/mount issue can
be solved with a new dax driver (which maybe provides this provider
interface) without needing to involve numa policy at all.
Essentially
fd = open("/dev/cxl_dev", ...); /* backed by anondax driver */
then later when a fault on that fd happens, the driver provides an
anon-memory allocation that explicitly requests the node associated
with that device - as opposed to trying to jam this into mempolicy.
If you're planning to be at LPC, happy to discuss this in person, but I
think this provider pattern is likely much cleaner without mempolicy at
all if you can just make the provider do that allocation path for you.
~Gregory
prev parent reply other threads:[~2026-10-01 13:43 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-26 0:50 Ackerley Tng via B4 Relay
2026-09-26 0:50 ` [PATCH RFC 01/17] mm: shmem: Implement guest_memfd provider operations for tmpfs Ackerley Tng via B4 Relay
2026-10-01 13:07 ` David Woodhouse
2026-10-01 14:17 ` Jason Gunthorpe
2026-10-01 15:47 ` David Woodhouse
2026-10-01 17:15 ` Jason Gunthorpe
2026-09-26 0:50 ` [PATCH RFC 02/17] KVM: guest_memfd: Support provider folio allocation Ackerley Tng via B4 Relay
2026-09-26 0:50 ` [PATCH RFC 03/17] KVM: guest_memfd: Support provider folio invalidation Ackerley Tng via B4 Relay
2026-09-26 0:50 ` [PATCH RFC 04/17] KVM: guest_memfd: Add helper to attach resource provider file Ackerley Tng via B4 Relay
2026-09-26 0:50 ` [PATCH RFC 05/17] KVM: selftests: Add helper to create guest_memfd with a resource file Ackerley Tng via B4 Relay
2026-09-26 0:50 ` [PATCH RFC 06/17] KVM: selftests: Test negative validation of resource_fd argument Ackerley Tng via B4 Relay
2026-09-26 0:50 ` [PATCH RFC 07/17] KVM: selftests: Test rejection of unsupported filesystem for resource_fd Ackerley Tng via B4 Relay
2026-09-26 0:50 ` [PATCH RFC 08/17] KVM: selftests: Test rejection of tmpfs file " Ackerley Tng via B4 Relay
2026-09-26 0:50 ` [PATCH RFC 09/17] KVM: selftests: Test rejection of swap tmpfs mounts Ackerley Tng via B4 Relay
2026-09-26 0:50 ` [PATCH RFC 10/17] KVM: selftests: Test rejection of hugepage " Ackerley Tng via B4 Relay
2026-09-26 0:50 ` [PATCH RFC 11/17] KVM: selftests: Test guest_memfd with anonymous fsmount() tmpfs pool Ackerley Tng via B4 Relay
2026-09-26 0:50 ` [PATCH RFC 12/17] KVM: selftests: Test guest_memfd with mounted tmpfs root directory Ackerley Tng via B4 Relay
2026-09-26 0:51 ` [PATCH RFC 13/17] KVM: selftests: Test guest_memfd resource pool sharing across instances Ackerley Tng via B4 Relay
2026-09-26 0:51 ` [PATCH RFC 14/17] KVM: selftests: Test memory allocation against shared tmpfs resource pool Ackerley Tng via B4 Relay
2026-09-26 0:51 ` [PATCH RFC 15/17] KVM: selftests: Test that shared tmpfs resource pool size limit is respected Ackerley Tng via B4 Relay
2026-09-26 0:51 ` [PATCH RFC 16/17] KVM: selftests: Test guest execution with tmpfs-backed guest_memfd Ackerley Tng via B4 Relay
2026-09-26 0:51 ` [PATCH RFC 17/17] KVM: selftests: Document testing TODOs Ackerley Tng via B4 Relay
2026-09-28 16:32 ` [PATCH RFC 00/17] Allow guest_memfd to be created using a resource (pool) fd David Woodhouse
2026-09-28 22:59 ` Ackerley Tng
2026-09-29 16:17 ` David Woodhouse
2026-09-29 23:41 ` Ackerley Tng
2026-09-30 0:08 ` David Woodhouse
2026-10-01 13:43 ` Gregory Price [this message]
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