From: Sean Christopherson <seanjc@google.com>
To: Ackerley Tng <ackerleytng@google.com>
Cc: Ackerley Tng via B4 Relay
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Subject: Re: [PATCH v7 00/42] guest_memfd: In-place conversion support
Date: Fri, 5 Jun 2026 11:27:58 -0700 [thread overview]
Message-ID: <aiMVLtblIKu1DQWJ@google.com> (raw)
In-Reply-To: <CAEvNRgHz5GDjq0GqRmpQdHc-X45gCNr39VYWZH-T7XhPEtN5CQ@mail.gmail.com>
On Thu, Jun 04, 2026, Ackerley Tng wrote:
> Sean Christopherson <seanjc@google.com> writes:
> >> + KVM: selftests: Test conversion with elevated page refcount
> >> + Askar pointed out that soon vmsplice may not pin pages. Should I
> >> pin pages through CONFIG_GUP_TEST like in [2]? I prefer not to
> >> take a dependency on CONFIG_GUP_TEST.
> >
> > I'm not exactly excited about taking a dependency on CONFIG_GUP_TEST either, but
> > it probably is the least awful choice. E.g. KVM also pins pages is certain flows,
> > but we're _also_ actively working to remove the need to pin.
> >
> > Hmm, maybe IORING_REGISTER_PBUF_RING? AFAICT, it's almost literally a "pin user
> > memory" syscall.
> >
>
> Hmm that takes a dependency on io_uring, which isn't always compiled
> in. Between CONFIG_IO_URING and CONFIG_GUP_TEST, I'd rather
> CONFIG_GUP_TEST.
Or try both? If it's not a ridiculous amount of work.
next prev parent reply other threads:[~2026-06-05 18:27 UTC|newest]
Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-23 0:17 [PATCH v7 00/42] guest_memfd: In-place conversion support Ackerley Tng via B4 Relay
2026-05-23 0:17 ` [PATCH v7 01/42] KVM: guest_memfd: Introduce per-gmem attributes, use to guard user mappings Ackerley Tng via B4 Relay
2026-05-23 0:17 ` [PATCH v7 02/42] KVM: Rename KVM_GENERIC_MEMORY_ATTRIBUTES to KVM_VM_MEMORY_ATTRIBUTES Ackerley Tng via B4 Relay
2026-05-23 0:17 ` [PATCH v7 03/42] KVM: Enumerate support for PRIVATE memory iff kvm_arch_has_private_mem is defined Ackerley Tng via B4 Relay
2026-05-23 0:17 ` [PATCH v7 04/42] KVM: Stub in ability to disable per-VM memory attribute tracking Ackerley Tng via B4 Relay
2026-05-23 0:17 ` [PATCH v7 05/42] KVM: guest_memfd: Wire up kvm_get_memory_attributes() to per-gmem attributes Ackerley Tng via B4 Relay
2026-05-23 0:17 ` [PATCH v7 06/42] KVM: guest_memfd: Update kvm_gmem_populate() to use gmem attributes Ackerley Tng via B4 Relay
2026-05-23 0:59 ` sashiko-bot
2026-05-23 0:17 ` [PATCH v7 07/42] KVM: guest_memfd: Only prepare folios for private pages Ackerley Tng via B4 Relay
2026-05-23 0:52 ` sashiko-bot
2026-05-27 21:22 ` Ackerley Tng
2026-06-02 20:41 ` Ackerley Tng
2026-06-02 8:55 ` Suzuki K Poulose
2026-06-02 9:10 ` Suzuki K Poulose
2026-06-02 22:41 ` Ackerley Tng
2026-06-03 8:58 ` Suzuki K Poulose
2026-06-03 13:51 ` Michael Roth
2026-06-02 20:46 ` Ackerley Tng
2026-06-03 13:54 ` Michael Roth
2026-05-23 0:17 ` [PATCH v7 08/42] KVM: Move kvm_supported_mem_attributes() to kvm_host.h Ackerley Tng via B4 Relay
2026-05-23 0:17 ` [PATCH v7 09/42] KVM: guest_memfd: Add base support for KVM_SET_MEMORY_ATTRIBUTES2 Ackerley Tng via B4 Relay
2026-05-23 1:01 ` sashiko-bot
2026-05-27 21:27 ` Ackerley Tng
2026-06-01 23:14 ` Michael Roth
2026-05-23 0:17 ` [PATCH v7 10/42] KVM: guest_memfd: Ensure pages are not in use before conversion Ackerley Tng via B4 Relay
2026-05-23 0:55 ` sashiko-bot
2026-05-23 0:17 ` [PATCH v7 11/42] KVM: guest_memfd: Call arch invalidate hooks on conversion Ackerley Tng via B4 Relay
2026-05-23 0:17 ` [PATCH v7 12/42] KVM: guest_memfd: Return early if range already has requested attributes Ackerley Tng via B4 Relay
2026-05-23 0:17 ` [PATCH v7 13/42] KVM: guest_memfd: Advertise KVM_SET_MEMORY_ATTRIBUTES2 ioctl Ackerley Tng via B4 Relay
2026-05-23 0:17 ` [PATCH v7 14/42] KVM: guest_memfd: Handle lru_add fbatch refcounts during conversion safety check Ackerley Tng via B4 Relay
2026-05-23 0:17 ` [PATCH v7 15/42] KVM: guest_memfd: Use actual size for invalidation in kvm_gmem_release() Ackerley Tng via B4 Relay
2026-05-23 0:17 ` [PATCH v7 16/42] KVM: guest_memfd: Determine invalidation filter from memory attributes Ackerley Tng via B4 Relay
2026-05-23 1:06 ` sashiko-bot
[not found] ` <CAEvNRgH21BoKT1mOQzgmKHKpDi4xbwtbMuenGv5U1ZUSENrJmg@mail.gmail.com>
2026-05-29 20:44 ` Sean Christopherson
2026-05-23 0:17 ` [PATCH v7 17/42] KVM: Move KVM_VM_MEMORY_ATTRIBUTES config definition to x86 Ackerley Tng via B4 Relay
2026-05-23 0:18 ` [PATCH v7 18/42] KVM: Let userspace disable per-VM mem attributes, enable per-gmem attributes Ackerley Tng via B4 Relay
2026-05-23 0:18 ` [PATCH v7 19/42] KVM: guest_memfd: Enable INIT_SHARED on guest_memfd for x86 Coco VMs Ackerley Tng via B4 Relay
2026-05-23 0:18 ` [PATCH v7 20/42] KVM: SEV: Make 'uaddr' parameter optional for KVM_SEV_SNP_LAUNCH_UPDATE Ackerley Tng via B4 Relay
2026-05-23 0:55 ` sashiko-bot
2026-05-27 23:31 ` Ackerley Tng
2026-06-04 15:29 ` Suzuki K Poulose
2026-06-04 19:05 ` Ackerley Tng
2026-06-05 8:54 ` Suzuki K Poulose
2026-06-04 20:11 ` Michael Roth
2026-06-05 9:06 ` Suzuki K Poulose
2026-05-23 0:18 ` [PATCH v7 21/42] KVM: TDX: Make source page optional for KVM_TDX_INIT_MEM_REGION Ackerley Tng via B4 Relay
2026-05-23 1:07 ` sashiko-bot
2026-06-03 21:22 ` Ackerley Tng
2026-06-03 23:45 ` Michael Roth
2026-06-03 23:55 ` Michael Roth
2026-06-05 18:40 ` Ackerley Tng
2026-05-23 0:18 ` [PATCH v7 22/42] KVM: selftests: Create gmem fd before "regular" fd when adding memslot Ackerley Tng via B4 Relay
2026-05-23 0:18 ` [PATCH v7 23/42] KVM: selftests: Rename guest_memfd{,_offset} to gmem_{fd,offset} Ackerley Tng via B4 Relay
2026-05-23 0:18 ` [PATCH v7 24/42] KVM: selftests: Add support for mmap() on guest_memfd in core library Ackerley Tng via B4 Relay
2026-05-23 0:18 ` [PATCH v7 25/42] KVM: selftests: Add selftests global for guest memory attributes capability Ackerley Tng via B4 Relay
2026-05-23 0:18 ` [PATCH v7 26/42] KVM: selftests: Add helpers for calling ioctls on guest_memfd Ackerley Tng via B4 Relay
2026-05-23 0:42 ` sashiko-bot
2026-06-03 16:33 ` Ackerley Tng
2026-05-23 0:18 ` [PATCH v7 27/42] KVM: selftests: Test basic single-page conversion flow Ackerley Tng via B4 Relay
2026-05-23 0:18 ` [PATCH v7 28/42] KVM: selftests: Test conversion flow when INIT_SHARED Ackerley Tng via B4 Relay
2026-05-23 0:18 ` [PATCH v7 29/42] KVM: selftests: Test conversion precision in guest_memfd Ackerley Tng via B4 Relay
2026-05-23 0:18 ` [PATCH v7 30/42] KVM: selftests: Test conversion before allocation Ackerley Tng via B4 Relay
2026-05-23 0:18 ` [PATCH v7 31/42] KVM: selftests: Convert with allocated folios in different layouts Ackerley Tng via B4 Relay
2026-05-23 0:18 ` [PATCH v7 32/42] KVM: selftests: Test that truncation does not change shared/private status Ackerley Tng via B4 Relay
2026-05-23 0:18 ` [PATCH v7 33/42] KVM: selftests: Test that shared/private status is consistent across processes Ackerley Tng via B4 Relay
2026-05-23 1:11 ` sashiko-bot
2026-05-23 0:18 ` [PATCH v7 34/42] KVM: selftests: Test conversion with elevated page refcount Ackerley Tng via B4 Relay
2026-06-02 21:26 ` Askar Safin
2026-05-23 0:18 ` [PATCH v7 35/42] KVM: selftests: Reset shared memory after hole-punching Ackerley Tng via B4 Relay
2026-05-23 0:18 ` [PATCH v7 36/42] KVM: selftests: Provide function to look up guest_memfd details from gpa Ackerley Tng via B4 Relay
2026-05-23 0:18 ` [PATCH v7 37/42] KVM: selftests: Provide common function to set memory attributes Ackerley Tng via B4 Relay
2026-05-23 1:35 ` sashiko-bot
2026-06-03 19:01 ` Ackerley Tng
2026-05-23 0:18 ` [PATCH v7 38/42] KVM: selftests: Check fd/flags provided to mmap() when setting up memslot Ackerley Tng via B4 Relay
2026-05-23 0:18 ` [PATCH v7 39/42] KVM: selftests: Make TEST_EXPECT_SIGBUS thread-safe Ackerley Tng via B4 Relay
2026-05-23 0:18 ` [PATCH v7 40/42] KVM: selftests: Update private_mem_conversions_test to mmap() guest_memfd Ackerley Tng via B4 Relay
2026-05-23 0:18 ` [PATCH v7 41/42] KVM: selftests: Add script to exercise private_mem_conversions_test Ackerley Tng via B4 Relay
2026-05-23 1:15 ` sashiko-bot
2026-05-23 0:18 ` [PATCH v7 42/42] KVM: selftests: Update private memory exits test to work with per-gmem attributes Ackerley Tng via B4 Relay
2026-06-03 21:27 ` [PATCH v7 00/42] guest_memfd: In-place conversion support Ackerley Tng
2026-06-04 20:20 ` Sean Christopherson
2026-06-04 21:14 ` Ackerley Tng
2026-06-05 18:27 ` Sean Christopherson [this message]
2026-06-05 13:41 ` [POC] KVM: selftests: Verify conversion works with TDX Ackerley Tng
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