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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2019 Joyent, Inc.
* Copyright 2021 Oxide Computer Company
*/
#ifndef _VMM_GPT_H
#define _VMM_GPT_H
#include <sys/types.h>
/*
* Constants for the nodes in the GPT radix tree. Note
* that, in accordance with hardware page table descriptions,
* the root of the tree is referred to as "LEVEL4" while the
* leaf level is "LEVEL1".
*/
enum vmm_gpt_node_level {
LEVEL4 = 0,
LEVEL3,
LEVEL2,
LEVEL1,
MAX_GPT_LEVEL,
};
/*
* The vmm_pte_ops structure contains function pointers for format-specific
* operations on page table entries. The operations are as follows:
*
* vpeo_map_table: Creates a PTE that maps an inner node in the page table.
* vpeo_map_page: Creates a leaf entry PTE that maps a page of physical memory.
* vpeo_pte_pfn: Returns the PFN contained in the given PTE.
* vpeo_pte_is_present: Returns true IFF the PTE maps a present page.
* vpeo_pte_prot: Returns a bitmask of protection bits for the PTE.
* The bits correspond to the standard mmap(2) bits: PROT_READ, PROT_WRITE,
* PROT_EXEC.
* vpeo_reset_dirty: Resets the dirty bit on the given PTE. If the second
* argument is `true`, the bit will be set, otherwise it will be cleared.
* Returns non-zero if the previous value of the bit was set.
* vpeo_reset_accessed: Resets the accessed bit on the given PTE. If the
* second argument is `true`, the bit will be set, otherwise it will be
* cleared. Returns non-zero if the previous value of the bit was set.
* vpeo_get_pmtp: Generate a properly formatted PML4 (EPTP/nCR3), given the root
* PFN for the GPT.
*/
typedef struct vmm_pte_ops vmm_pte_ops_t;
struct vmm_pte_ops {
uint64_t (*vpeo_map_table)(pfn_t);
uint64_t (*vpeo_map_page)(pfn_t, uint_t, uint8_t);
pfn_t (*vpeo_pte_pfn)(uint64_t);
bool (*vpeo_pte_is_present)(uint64_t);
uint_t (*vpeo_pte_prot)(uint64_t);
uint_t (*vpeo_reset_dirty)(uint64_t *, bool);
uint_t (*vpeo_reset_accessed)(uint64_t *, bool);
uint64_t (*vpeo_get_pmtp)(pfn_t);
};
extern vmm_pte_ops_t ept_pte_ops;
extern vmm_pte_ops_t rvi_pte_ops;
struct vmm_gpt;
typedef struct vmm_gpt vmm_gpt_t;
vmm_gpt_t *vmm_gpt_alloc(vmm_pte_ops_t *);
void vmm_gpt_free(vmm_gpt_t *);
uint64_t *vmm_gpt_lookup(vmm_gpt_t *, uint64_t);
void vmm_gpt_walk(vmm_gpt_t *, uint64_t, uint64_t **, enum vmm_gpt_node_level);
void vmm_gpt_populate_region(vmm_gpt_t *, uint64_t, uint64_t);
bool vmm_gpt_map_at(vmm_gpt_t *, uint64_t *, pfn_t, uint_t, uint8_t);
void vmm_gpt_vacate_region(vmm_gpt_t *, uint64_t, uint64_t);
bool vmm_gpt_map(vmm_gpt_t *, uint64_t, pfn_t, uint_t, uint8_t);
bool vmm_gpt_unmap(vmm_gpt_t *, uint64_t);
size_t vmm_gpt_unmap_region(vmm_gpt_t *, uint64_t, uint64_t);
uint64_t vmm_gpt_get_pmtp(vmm_gpt_t *);
bool vmm_gpt_is_mapped(vmm_gpt_t *, uint64_t *, pfn_t *, uint_t *);
uint_t vmm_gpt_reset_accessed(vmm_gpt_t *, uint64_t *, bool);
uint_t vmm_gpt_reset_dirty(vmm_gpt_t *, uint64_t *, bool);
#endif /* _VMM_GPT_H */
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