From: Peter Xu <peterx@redhat.com>
To: Nikita Kalyazin <kalyazin@amazon.com>
Cc: James Houghton <jthoughton@google.com>,
akpm@linux-foundation.org, pbonzini@redhat.com, shuah@kernel.org,
kvm@vger.kernel.org, linux-kselftest@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
lorenzo.stoakes@oracle.com, david@redhat.com,
ryan.roberts@arm.com, quic_eberman@quicinc.com, graf@amazon.de,
jgowans@amazon.com, roypat@amazon.co.uk, derekmn@amazon.com,
nsaenz@amazon.es, xmarcalx@amazon.com
Subject: Re: [RFC PATCH 0/5] KVM: guest_memfd: support for uffd missing
Date: Fri, 14 Mar 2025 14:32:05 -0400 [thread overview]
Message-ID: <Z9R2JapHdhR2Xhp_@x1.local> (raw)
In-Reply-To: <24528be7-8f7a-4928-8bca-5869cf14eace@amazon.com>
On Fri, Mar 14, 2025 at 05:12:35PM +0000, Nikita Kalyazin wrote:
> Yes, I was thinking about MADV_POPULATE_WRITE as well, but AFAIK it isn't
> available in guest_memfd, at least with direct map removed due to [1] being
> updated in [2]:
I see, so GUP is no-go. IIUC the userapp can also prefault by writing
zeros in a loop after mmap().
Thanks,
--
Peter Xu
next prev parent reply other threads:[~2025-03-14 18:32 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-03 13:30 Nikita Kalyazin
2025-03-03 13:30 ` [RFC PATCH 1/5] KVM: guest_memfd: add kvm_gmem_vma_is_gmem Nikita Kalyazin
2025-03-03 13:30 ` [RFC PATCH 2/5] KVM: guest_memfd: add support for uffd missing Nikita Kalyazin
2025-03-03 13:30 ` [RFC PATCH 3/5] mm: userfaultfd: allow to register userfaultfd for guest_memfd Nikita Kalyazin
2025-03-03 13:30 ` [RFC PATCH 4/5] mm: userfaultfd: support continue " Nikita Kalyazin
2025-03-03 13:30 ` [RFC PATCH 5/5] KVM: selftests: add uffd missing test " Nikita Kalyazin
2025-03-03 21:29 ` [RFC PATCH 0/5] KVM: guest_memfd: support for uffd missing Peter Xu
2025-03-05 19:35 ` James Houghton
2025-03-05 20:29 ` Peter Xu
2025-03-10 18:12 ` Nikita Kalyazin
2025-03-10 19:57 ` Peter Xu
2025-03-11 16:56 ` Nikita Kalyazin
2025-03-12 15:45 ` Peter Xu
2025-03-12 17:07 ` Nikita Kalyazin
2025-03-12 19:32 ` Peter Xu
2025-03-13 15:25 ` Nikita Kalyazin
2025-03-13 19:12 ` Peter Xu
2025-03-13 22:13 ` Nikita Kalyazin
2025-03-13 22:38 ` Peter Xu
2025-03-14 17:12 ` Nikita Kalyazin
2025-03-14 18:32 ` Peter Xu [this message]
2025-03-14 20:04 ` Peter Xu
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