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https://github.com/cloud-hypervisor/cloud-hypervisor.git
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de37f27945
Add a small constants module with the ioctl numbers and protocol constants needed for userfaultfd-based demand-paged snapshot restore. These are derived from the kernel's include/uapi/linux/userfaultfd.h. Signed-off-by: Shayon Mukherjee <shayonj@gmail.com>
26 lines
1.1 KiB
Rust
26 lines
1.1 KiB
Rust
// Copyright © 2026 Cloud Hypervisor Authors
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//
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// SPDX-License-Identifier: Apache-2.0
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// See include/uapi/linux/userfaultfd.h in the kernel code.
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pub const UFFDIO_API: u64 = 0xc018_aa3f; // _IOWR(0xAA, 0x3F, struct uffdio_api)
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pub const UFFDIO_REGISTER: u64 = 0xc020_aa00; // _IOWR(0xAA, 0x00, struct uffdio_register)
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pub const UFFDIO_COPY: u64 = 0xc028_aa03; // _IOWR(0xAA, 0x03, struct uffdio_copy)
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pub const UFFDIO_WAKE: u64 = 0x4010_aa02; // _IOW(0xAA, 0x02, struct uffdio_range)
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// Seccomp compares these as Dword (u32); ensure they fit.
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const _: () = assert!(UFFDIO_API <= u32::MAX as u64);
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const _: () = assert!(UFFDIO_REGISTER <= u32::MAX as u64);
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const _: () = assert!(UFFDIO_COPY <= u32::MAX as u64);
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const _: () = assert!(UFFDIO_WAKE <= u32::MAX as u64);
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pub const UFFD_API: u64 = 0xAA;
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pub const UFFDIO_REGISTER_MODE_MISSING: u64 = 1;
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pub const UFFD_EVENT_PAGEFAULT: u8 = 0x12;
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pub const UFFD_FEATURE_MISSING_SHMEM: u64 = 1 << 5;
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pub const UFFD_FEATURE_MISSING_HUGETLBFS: u64 = 1 << 6;
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const _UFFDIO_COPY: u64 = 0x03;
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const _UFFDIO_WAKE: u64 = 0x02;
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pub const UFFD_API_RANGE_IOCTLS_BASIC: u64 = (1 << _UFFDIO_WAKE) | (1 << _UFFDIO_COPY);
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