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charset="utf-8" Message-Id: <20261022-gmem-alternative-providers-v2-6-5dd1dc6c660a@google.com> References: <20261022-gmem-alternative-providers-v2-0-5dd1dc6c660a@google.com> In-Reply-To: <20261022-gmem-alternative-providers-v2-0-5dd1dc6c660a@google.com> To: Alex Williamson , Alexander Graf , Alexander Viro , Alexey Kardashevskiy , Andrew Morton , "Aneesh Kumar K.V" , Ashish Kalra , Baolin Wang , Baolu Lu , Bill Wendling , Borislav Petkov , Catalin Marinas , Christian Brauner , =?utf-8?q?Christian_K=C3=B6nig?= , Connor Williamson , Dave Hansen , Dave Jiang , David Hildenbrand , David Rientjes , David Woodhouse , Erdem Aktas , Frank van der Linden , Fred Griffoul , Fred Griffoul , Gregory Price , "H. Peter Anvin" , Hugh Dickins , Ingo Molnar , Jacob Pan , James Houghton , Jan Kara , Jason Gunthorpe , Jianxiong Gao , Joerg Roedel , Joey Gouly , John Starks , Jonathan Corbet , Justin Stitt , Kevin Tian , Lorenzo Stoakes , Marc Zyngier , Michael Roth , Mike Rapoport , Nathan Chancellor , Nick Desaulniers , Nicolin Chen , Oliver Upton , Paolo Bonzini , Pratyush Yadav , Randy Dunlap , Robin Murphy , Samiullah Khawaja , Sean Christopherson , Shuah Khan , Steffen Eiden , Steven Price , Suzuki K Poulose , Tarun Sahu , Thomas Gleixner , Tom Lendacky , Tycho Andersen , Vishal Annapurve , Vlastimil Babka , Will Deacon , Xu Yilun , Yan Zhao , Zenghui Yu , x86@kernel.org, Shuah Khan , Fuad Tabba Cc: kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, llvm@lists.linux.dev, Ackerley Tng X-Mailer: b4 0.17-dev X-Developer-Signature: v=1; a=ed25519-sha256; t=1792711665; l=2914; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=wQedx/S6RxZ5UzC/bx0PyQVruBvMuVfyn7u3LMl/3ZU=; b=EZ/IOKpg7KrAdS+lcfSuSMk9DELGjm3sYsNs1mz6sm7ZEuVpMp37oLH+u11yOwKkXF2Xnz8Tj 3g1yoTCZwRKCsclSrPBbeDHUK9cbqEbMDHc35h0WidAbFngykeYbEVn X-Developer-Key: i=ackerleytng@google.com; a=ed25519; pk=sAZDYXdm6Iz8FHitpHeFlCMXwabodTm7p8/3/8xUxuU= X-Endpoint-Received: by B4 Relay for ackerleytng@google.com/20260225 with auth_id=649 X-Original-From: Ackerley Tng Reply-To: ackerleytng@google.com Content-Transfer-Encoding: 7bit From: Ackerley Tng Add a helper to create guest_memfd instances with a resource file descriptor, and update the existing creation helper to pass a zero resource file descriptor. Signed-off-by: Ackerley Tng --- tools/include/uapi/linux/kvm.h | 5 ++++- tools/testing/selftests/kvm/include/kvm_util.h | 23 ++++++++++++++++++----- 2 files changed, 22 insertions(+), 6 deletions(-) diff --git a/tools/include/uapi/linux/kvm.h b/tools/include/uapi/linux/kvm.h index 419011097fa8e..66c1f40b50c29 100644 --- a/tools/include/uapi/linux/kvm.h +++ b/tools/include/uapi/linux/kvm.h @@ -1654,11 +1654,14 @@ struct kvm_memory_attributes { #define KVM_CREATE_GUEST_MEMFD _IOWR(KVMIO, 0xd4, struct kvm_create_guest_memfd) #define GUEST_MEMFD_FLAG_MMAP (1ULL << 0) #define GUEST_MEMFD_FLAG_INIT_SHARED (1ULL << 1) +#define GUEST_MEMFD_FLAG_USE_RESOURCE (1ULL << 2) struct kvm_create_guest_memfd { __u64 size; __u64 flags; - __u64 reserved[6]; + __s32 resource_fd; + __u32 pad; + __u64 reserved[5]; }; #define KVM_PRE_FAULT_MEMORY _IOWR(KVMIO, 0xd5, struct kvm_pre_fault_memory) diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h index e2618877619e1..eca296539db79 100644 --- a/tools/testing/selftests/kvm/include/kvm_util.h +++ b/tools/testing/selftests/kvm/include/kvm_util.h @@ -809,26 +809,39 @@ static inline bool is_smt_on(void) void vm_create_irqchip(struct kvm_vm *vm); -static inline int __vm_create_guest_memfd(struct kvm_vm *vm, u64 size, - u64 flags) +static inline int __vm_create_guest_memfd_resource(struct kvm_vm *vm, u64 size, + u64 flags, int resource_fd) { struct kvm_create_guest_memfd guest_memfd = { .size = size, .flags = flags, + .resource_fd = resource_fd, }; return __vm_ioctl(vm, KVM_CREATE_GUEST_MEMFD, &guest_memfd); } -static inline int vm_create_guest_memfd(struct kvm_vm *vm, u64 size, - u64 flags) +static inline int __vm_create_guest_memfd(struct kvm_vm *vm, u64 size, + u64 flags) +{ + return __vm_create_guest_memfd_resource(vm, size, flags, 0); +} + +static inline int vm_create_guest_memfd_resource(struct kvm_vm *vm, u64 size, + u64 flags, int resource_fd) { - int fd = __vm_create_guest_memfd(vm, size, flags); + int fd = __vm_create_guest_memfd_resource(vm, size, flags, resource_fd); TEST_ASSERT(fd >= 0, KVM_IOCTL_ERROR(KVM_CREATE_GUEST_MEMFD, fd)); return fd; } +static inline int vm_create_guest_memfd(struct kvm_vm *vm, u64 size, + u64 flags) +{ + return vm_create_guest_memfd_resource(vm, size, flags, 0); +} + void vm_set_user_memory_region(struct kvm_vm *vm, u32 slot, u32 flags, gpa_t gpa, u64 size, void *hva); int __vm_set_user_memory_region(struct kvm_vm *vm, u32 slot, u32 flags, -- 2.56.0.257.gf7497c7d27-goog