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mshv.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ /* * Userspace interfaces for /dev/mshv* devices and derived fds * * This file is divided into sections containing data structures and IOCTLs for * a particular set of related devices or derived file descriptors. * * The IOCTL definitions are at the end of each section. They are grouped by * device/fd, so that new IOCTLs can easily be added with a monotonically * increasing number. */ #ifndef _LINUX_MSHV_H #define _LINUX_MSHV_H #include <linux/types.h> #define MSHV_IOCTL 0xB8 /* ******************************************* * Entry point to main VMM APIs: /dev/mshv * ******************************************* */ enum { MSHV_PT_BIT_LAPIC, MSHV_PT_BIT_X2APIC, MSHV_PT_BIT_GPA_SUPER_PAGES, MSHV_PT_BIT_COUNT, }; #define MSHV_PT_FLAGS_MASK ((1 << MSHV_PT_BIT_COUNT) - 1) enum { MSHV_PT_ISOLATION_NONE, MSHV_PT_ISOLATION_COUNT, }; /** * struct mshv_create_partition - arguments for MSHV_CREATE_PARTITION * @pt_flags: Bitmask of 1 << MSHV_PT_BIT_* * @pt_isolation: MSHV_PT_ISOLATION_* * * Returns a file descriptor to act as a handle to a guest partition. * At this point the partition is not yet initialized in the hypervisor. * Some operations must be done with the partition in this state, e.g. setting * so-called "early" partition properties. The partition can then be * initialized with MSHV_INITIALIZE_PARTITION. */ struct mshv_create_partition { __u64 pt_flags; __u64 pt_isolation; }; /* /dev/mshv */ #define MSHV_CREATE_PARTITION _IOW(MSHV_IOCTL, 0x00, struct mshv_create_partition) /* ************************ * Child partition APIs * ************************ */ struct mshv_create_vp { __u32 vp_index; }; enum { MSHV_SET_MEM_BIT_WRITABLE, MSHV_SET_MEM_BIT_EXECUTABLE, MSHV_SET_MEM_BIT_UNMAP, MSHV_SET_MEM_BIT_COUNT }; #define MSHV_SET_MEM_FLAGS_MASK ((1 << MSHV_SET_MEM_BIT_COUNT) - 1) /* The hypervisor's "native" page size */ #define MSHV_HV_PAGE_SIZE 0x1000 /** * struct mshv_user_mem_region - arguments for MSHV_SET_GUEST_MEMORY * @size: Size of the memory region (bytes). Must be aligned to * MSHV_HV_PAGE_SIZE * @guest_pfn: Base guest page number to map * @userspace_addr: Base address of userspace memory. Must be aligned to * MSHV_HV_PAGE_SIZE * @flags: Bitmask of 1 << MSHV_SET_MEM_BIT_*. If (1 << MSHV_SET_MEM_BIT_UNMAP) * is set, ignore other bits. * @rsvd: MBZ * * Map or unmap a region of userspace memory to Guest Physical Addresses (GPA). * Mappings can't overlap in GPA space or userspace. * To unmap, these fields must match an existing mapping. */ struct mshv_user_mem_region { __u64 size; __u64 guest_pfn; __u64 userspace_addr; __u8 flags; __u8 rsvd[7]; }; enum { MSHV_IRQFD_BIT_DEASSIGN, MSHV_IRQFD_BIT_RESAMPLE, MSHV_IRQFD_BIT_COUNT, }; #define MSHV_IRQFD_FLAGS_MASK ((1 << MSHV_IRQFD_BIT_COUNT) - 1) struct mshv_user_irqfd { __s32 fd; __s32 resamplefd; __u32 gsi; __u32 flags; }; enum { MSHV_IOEVENTFD_BIT_DATAMATCH, MSHV_IOEVENTFD_BIT_PIO, MSHV_IOEVENTFD_BIT_DEASSIGN, MSHV_IOEVENTFD_BIT_COUNT, }; #define MSHV_IOEVENTFD_FLAGS_MASK ((1 << MSHV_IOEVENTFD_BIT_COUNT) - 1) struct mshv_user_ioeventfd { __u64 datamatch; __u64 addr; /* legal pio/mmio address */ __u32 len; /* 1, 2, 4, or 8 bytes */ __s32 fd; __u32 flags; __u8 rsvd[4]; }; struct mshv_user_irq_entry { __u32 gsi; __u32 address_lo; __u32 address_hi; __u32 data; }; struct mshv_user_irq_table { __u32 nr; __u32 rsvd; /* MBZ */ struct mshv_user_irq_entry entries[]; }; enum { MSHV_GPAP_ACCESS_TYPE_ACCESSED, MSHV_GPAP_ACCESS_TYPE_DIRTY, MSHV_GPAP_ACCESS_TYPE_COUNT /* Count of enum members */ }; enum { MSHV_GPAP_ACCESS_OP_NOOP, MSHV_GPAP_ACCESS_OP_CLEAR, MSHV_GPAP_ACCESS_OP_SET, MSHV_GPAP_ACCESS_OP_COUNT /* Count of enum members */ }; /** * struct mshv_gpap_access_bitmap - arguments for MSHV_GET_GPAP_ACCESS_BITMAP * @access_type: MSHV_GPAP_ACCESS_TYPE_* - The type of access to record in the * bitmap * @access_op: MSHV_GPAP_ACCESS_OP_* - Allows an optional clear or set of all * the access states in the range, after retrieving the current * states. * @rsvd: MBZ * @page_count: Number of pages * @gpap_base: Base gpa page number * @bitmap_ptr: Output buffer for bitmap, at least (page_count + 7) / 8 bytes * * Retrieve a bitmap of either ACCESSED or DIRTY bits for a given range of guest * memory, and optionally clear or set the bits. */ struct mshv_gpap_access_bitmap { __u8 access_type; __u8 access_op; __u8 rsvd[6]; __u64 page_count; __u64 gpap_base; __u64 bitmap_ptr; }; /** * struct mshv_root_hvcall - arguments for MSHV_ROOT_HVCALL * @code: Hypercall code (HVCALL_*) * @reps: in: Rep count ('repcount') * out: Reps completed ('repcomp'). MBZ unless rep hvcall * @in_sz: Size of input incl rep data. <= MSHV_HV_PAGE_SIZE * @out_sz: Size of output buffer. <= MSHV_HV_PAGE_SIZE. MBZ if out_ptr is 0 * @status: in: MBZ * out: HV_STATUS_* from hypercall * @rsvd: MBZ * @in_ptr: Input data buffer (struct hv_input_*). If used with partition or * vp fd, partition id field is populated by kernel. * @out_ptr: Output data buffer (optional) */ struct mshv_root_hvcall { __u16 code; __u16 reps; __u16 in_sz; __u16 out_sz; __u16 status; __u8 rsvd[6]; __u64 in_ptr; __u64 out_ptr; }; /* Partition fds created with MSHV_CREATE_PARTITION */ #define MSHV_INITIALIZE_PARTITION _IO(MSHV_IOCTL, 0x00) #define MSHV_CREATE_VP _IOW(MSHV_IOCTL, 0x01, struct mshv_create_vp) #define MSHV_SET_GUEST_MEMORY _IOW(MSHV_IOCTL, 0x02, struct mshv_user_mem_region) #define MSHV_IRQFD _IOW(MSHV_IOCTL, 0x03, struct mshv_user_irqfd) #define MSHV_IOEVENTFD _IOW(MSHV_IOCTL, 0x04, struct mshv_user_ioeventfd) #define MSHV_SET_MSI_ROUTING _IOW(MSHV_IOCTL, 0x05, struct mshv_user_irq_table) #define MSHV_GET_GPAP_ACCESS_BITMAP _IOWR(MSHV_IOCTL, 0x06, struct mshv_gpap_access_bitmap) /* Generic hypercall */ #define MSHV_ROOT_HVCALL _IOWR(MSHV_IOCTL, 0x07, struct mshv_root_hvcall) /* ******************************** * VP APIs for child partitions * ******************************** */ #define MSHV_RUN_VP_BUF_SZ 256 /* * VP state pages may be mapped to userspace via mmap(). * To specify which state page, use MSHV_VP_MMAP_OFFSET_ values multiplied by * the system page size. * e.g. * long page_size = sysconf(_SC_PAGE_SIZE); * void *reg_page = mmap(NULL, MSHV_HV_PAGE_SIZE, PROT_READ|PROT_WRITE, * MAP_SHARED, vp_fd, * MSHV_VP_MMAP_OFFSET_REGISTERS * page_size); */ enum { MSHV_VP_MMAP_OFFSET_REGISTERS, MSHV_VP_MMAP_OFFSET_INTERCEPT_MESSAGE, MSHV_VP_MMAP_OFFSET_GHCB, MSHV_VP_MMAP_OFFSET_COUNT }; /** * struct mshv_run_vp - argument for MSHV_RUN_VP * @msg_buf: On success, the intercept message is copied here. It can be * interpreted using the relevant hypervisor definitions. */ struct mshv_run_vp { __u8 msg_buf[MSHV_RUN_VP_BUF_SZ]; }; enum { MSHV_VP_STATE_LAPIC, /* Local interrupt controller state (either arch) */ MSHV_VP_STATE_XSAVE, /* XSAVE data in compacted form (x86_64) */ MSHV_VP_STATE_SIMP, MSHV_VP_STATE_SIEFP, MSHV_VP_STATE_SYNTHETIC_TIMERS, MSHV_VP_STATE_COUNT, }; /** * struct mshv_get_set_vp_state - arguments for MSHV_[GET,SET]_VP_STATE * @type: MSHV_VP_STATE_* * @rsvd: MBZ * @buf_sz: in: 4k page-aligned size of buffer * out: Actual size of data (on EINVAL, check this to see if buffer * was too small) * @buf_ptr: 4k page-aligned data buffer */ struct mshv_get_set_vp_state { __u8 type; __u8 rsvd[3]; __u32 buf_sz; __u64 buf_ptr; }; /* VP fds created with MSHV_CREATE_VP */ #define MSHV_RUN_VP _IOR(MSHV_IOCTL, 0x00, struct mshv_run_vp) #define MSHV_GET_VP_STATE _IOWR(MSHV_IOCTL, 0x01, struct mshv_get_set_vp_state) #define MSHV_SET_VP_STATE _IOWR(MSHV_IOCTL, 0x02, struct mshv_get_set_vp_state) /* * Generic hypercall * Defined above in partition IOCTLs, avoid redefining it here * #define MSHV_ROOT_HVCALL _IOWR(MSHV_IOCTL, 0x07, struct mshv_root_hvcall) */ #endif
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