From: Gregory Price <gourry@gourry.net>
To: "David Hildenbrand (Arm)" <david@kernel.org>
Cc: linux-mm@kvack.org, kvm@vger.kernel.org,
linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org,
kernel-team@meta.com, pbonzini@redhat.com, seanjc@google.com,
akpm@linux-foundation.org, ziy@nvidia.com,
matthew.brost@intel.com, joshua.hahnjy@gmail.com,
rakie.kim@sk.com, byungchul@sk.com,
ying.huang@linux.alibaba.com, apopple@nvidia.com,
shuah@kernel.org
Subject: Re: [PATCH 0/5] KVM: guest_memfd: bind backing memory to a NUMA node
Date: Thu, 10 Sep 2026 09:40:28 -0400 [thread overview]
Message-ID: <aqKzIO3DD66Dhkdw@gourry-fedora-PF4VCD3F> (raw)
In-Reply-To: <9b67424d-70e5-442b-9ec7-22b1d3db12f4@kernel.org>
On Thu, Sep 10, 2026 at 01:30:04PM +0200, David Hildenbrand (Arm) wrote:
> On 9/2/26 21:46, Gregory Price wrote:
> > guest_memfd allocates its folios through a per-inode shared mempolicy.
> >
> > Today that policy can only be set after the fact, with mbind() on a host
> > mmap of the fd. That requires the fd to be mappable, and it cannot reach
> > folios that are only ever guest-faulted. Neither holds for a
> > non-mappable (confidential) guest_memfd.
>
> That looks like an investment into a mechanism we will soon consider legacy, so
> I am not convinced this is the right approach?
>
Hm, I think i've missed recent work in this space / this context.
Any suggested reading here? Don't want to eat too much of your time.
~Gregory
next prev parent reply other threads:[~2026-09-10 13:40 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-02 19:46 [PATCH 0/5] KVM: guest_memfd: bind backing memory to a NUMA node Gregory Price
2026-09-02 19:46 ` [PATCH 1/5] mm/mempolicy: add mempolicy_create() Gregory Price
2026-09-02 19:46 ` [PATCH 2/5] mm/mempolicy: add mpol_set_shared_policy_range() Gregory Price
2026-09-02 19:46 ` [PATCH 3/5] KVM: guest_memfd: bind backing memory to a NUMA node at creation Gregory Price
2026-09-02 20:00 ` sashiko-bot
2026-09-02 19:46 ` [PATCH 4/5] selftests: KVM: guest_memfd: let the gmem_test() harness bind a node Gregory Price
2026-09-02 19:59 ` sashiko-bot
2026-09-02 19:46 ` [PATCH 5/5] selftests: KVM: guest_memfd: test GUEST_MEMFD_FLAG_BIND_NODE Gregory Price
2026-09-02 20:04 ` sashiko-bot
2026-09-09 22:41 ` [PATCH 0/5] KVM: guest_memfd: bind backing memory to a NUMA node Ackerley Tng
2026-09-09 23:10 ` Gregory Price
2026-09-09 23:23 ` Ackerley Tng
2026-09-09 23:41 ` Gregory Price
2026-09-10 11:32 ` David Hildenbrand (Arm)
2026-09-10 13:39 ` Gregory Price
2026-09-10 14:00 ` David Hildenbrand (Arm)
2026-09-10 11:30 ` David Hildenbrand (Arm)
2026-09-10 13:40 ` Gregory Price [this message]
2026-09-10 14:05 ` David Hildenbrand (Arm)
2026-09-10 14:46 ` Gregory Price
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