Re: [PATCH v13 00/44] guest_memfd: In-place conversion support

[Sean Christopherson]

On Thu, 10 Sep 2026 16:55:26 -0700, Ackerley Tng wrote:
> Here's v13. Thanks everyone for the comments and fast responses!
> We're now at ~3 weeks to soft-close at 7.3-rc5.
> 
> v13 is based on 7.3-rc2 and:
> 
> + Hugh's patch to export lru_cache_drain_for_folio()
> + Another series [1], which makes kvm_gmem_get_pfn() NOT return a
>   refcounted page to KVM.
> 
> [...]

Applied to kvm-x86 coco.  A *huge* thanks to everyone who helped with this!

[01/44] KVM: guest_memfd: Optimize away conversion overheads via dead-code elimination
        https://github.com/kvm-x86/linux/commit/54623a16bbdc
[02/44] KVM: guest_memfd: Use kvm_mem_is_private() when populating guest_memfd memory
        https://github.com/kvm-x86/linux/commit/fa7b8b1bb5d0
[03/44] KVM: guest_memfd: Introduce per-gmem attributes, use to guard user mappings
        https://github.com/kvm-x86/linux/commit/1ae5be958ff7
[04/44] KVM: Rename KVM_GENERIC_MEMORY_ATTRIBUTES to KVM_VM_MEMORY_ATTRIBUTES
        https://github.com/kvm-x86/linux/commit/44e17d0a3663
[05/44] KVM: Enumerate support for PRIVATE memory iff kvm_arch_has_private_mem is defined
        https://github.com/kvm-x86/linux/commit/c2ae2bc1a311
[06/44] KVM: Rename memory attribute APIs to prepare for in-place gmem conversion
        https://github.com/kvm-x86/linux/commit/a84ef89cbf91
[07/44] KVM: Rename kvm_mem_is_private() to kvm_is_private_gfn()
        https://github.com/kvm-x86/linux/commit/98fd6e30bd14
[08/44] KVM: Provide generic interface for checking memory private/shared status
        https://github.com/kvm-x86/linux/commit/8ab5719fbcdc
[09/44] KVM: guest_memfd: Stub in ability to enable in-place shared<=>private conversion
        https://github.com/kvm-x86/linux/commit/ee1168fb7313
[10/44] KVM: Consolidate private memory and guest_memfd ifdeffery in kvm_host.h
        https://github.com/kvm-x86/linux/commit/bcc640eabbb2
[11/44] KVM: guest_memfd: Invalidate both SHARED and PRIVATE mappings for in-place conversions
        https://github.com/kvm-x86/linux/commit/e088c7f86bef
[12/44] KVM: guest_memfd: Always fault from guest_memfd if in-place conversion is enabled
        https://github.com/kvm-x86/linux/commit/2e646bcfcf90
[13/44] KVM: guest_memfd: Pass mapping type filter to invalidation helper
        https://github.com/kvm-x86/linux/commit/2f7f4e102880
[14/44] KVM: guest_memfd: Add base support for KVM_SET_MEMORY_ATTRIBUTES2
        https://github.com/kvm-x86/linux/commit/799c9fadc639
[15/44] KVM: guest_memfd: Ensure pages are not in use before conversion
        https://github.com/kvm-x86/linux/commit/dcde2f853ff4
[16/44] KVM: guest_memfd: Call arch make_shared callback for to-shared conversion
        https://github.com/kvm-x86/linux/commit/6fa1dab756fd
[17/44] KVM: guest_memfd: Return early if range already has requested attributes
        https://github.com/kvm-x86/linux/commit/856852ef2108
[18/44] KVM: guest_memfd: Zero page while getting pfn
        https://github.com/kvm-x86/linux/commit/cb0544296a33
[19/44] KVM: SEV: Make 'uaddr' parameter optional for KVM_SEV_SNP_LAUNCH_UPDATE
        https://github.com/kvm-x86/linux/commit/edcc3f42981e
[20/44] KVM: TDX: Make source page optional for KVM_TDX_INIT_MEM_REGION
        https://github.com/kvm-x86/linux/commit/af602a96f401
[21/44] KVM: Move KVM_VM_MEMORY_ATTRIBUTES config definition to x86
        https://github.com/kvm-x86/linux/commit/31670c382efc
[22/44] KVM: Let userspace disable per-VM mem attributes, enable per-gmem attributes
        https://github.com/kvm-x86/linux/commit/537ec2b15fdd
[23/44] KVM: guest_memfd: Enable INIT_SHARED on guest_memfd for x86 Coco VMs
        https://github.com/kvm-x86/linux/commit/b5ed1ee2a7a0
[24/44] KVM: selftests: Create gmem fd before "regular" fd when adding memslot
        https://github.com/kvm-x86/linux/commit/b312cab4e48c
[25/44] KVM: selftests: Rename guest_memfd{,_offset} to gmem_{fd,offset}
        https://github.com/kvm-x86/linux/commit/8d5f49000f8b
[26/44] KVM: selftests: Add support for mmap() on guest_memfd in core library
        https://github.com/kvm-x86/linux/commit/ee455183c92b
[27/44] KVM: selftests: Add selftests global for guest memory attributes capability
        https://github.com/kvm-x86/linux/commit/c3e48c166e35
[28/44] KVM: selftests: Add helpers for calling ioctls on guest_memfd
        https://github.com/kvm-x86/linux/commit/0bbbd2b02bf0
[29/44] KVM: selftests: Test basic single-page conversion flow
        https://github.com/kvm-x86/linux/commit/eaef4ed5fabc
[30/44] KVM: selftests: Test conversion flow when INIT_SHARED
        https://github.com/kvm-x86/linux/commit/e5fa04dc920e
[31/44] KVM: selftests: Test conversion precision in guest_memfd
        https://github.com/kvm-x86/linux/commit/492080a3d4e5
[32/44] KVM: selftests: Test conversion before allocation
        https://github.com/kvm-x86/linux/commit/97137c140360
[33/44] KVM: selftests: Convert with allocated folios in different layouts
        https://github.com/kvm-x86/linux/commit/5362c5fb88f6
[34/44] KVM: selftests: Test that truncation does not change shared/private status
        https://github.com/kvm-x86/linux/commit/bfb9b5a286ea
[35/44] KVM: selftests: Test that shared/private status is consistent across processes
        https://github.com/kvm-x86/linux/commit/8b72eaa766b6
[36/44] KVM: selftests: Add helpers to pin pages with CONFIG_GUP_TEST
        https://github.com/kvm-x86/linux/commit/e8a40b9a604e
[37/44] KVM: selftests: Test conversion with elevated page refcount
        https://github.com/kvm-x86/linux/commit/0db3f14f40c4
[38/44] KVM: selftests: Reset shared memory after hole-punching
        https://github.com/kvm-x86/linux/commit/c235250e8bc1
[39/44] KVM: selftests: Provide function to look up guest_memfd details from gpa
        https://github.com/kvm-x86/linux/commit/ee6f4c381903
[40/44] KVM: selftests: Provide common function to set memory attributes
        https://github.com/kvm-x86/linux/commit/f49dd8ba330e
[41/44] KVM: selftests: Make TEST_EXPECT_SIGBUS thread-safe
        https://github.com/kvm-x86/linux/commit/ef72e71da099
[42/44] KVM: selftests: Set up page size and alignment independently for guest_memfd
        https://github.com/kvm-x86/linux/commit/710169986d9b
[43/44] KVM: selftests: Update private_mem_conversions_test for in-place conversions
        https://github.com/kvm-x86/linux/commit/e24e534ff850
[44/44] KVM: selftests: Update private memory exits test to work with per-gmem attributes
        https://github.com/kvm-x86/linux/commit/37e0791600e5

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