330 lines
8.4 KiB
C
330 lines
8.4 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* ACRN: Memory mapping management
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*
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* Copyright (C) 2020 Intel Corporation. All rights reserved.
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*
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* Authors:
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* Fei Li <lei1.li@intel.com>
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* Shuo Liu <shuo.a.liu@intel.com>
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*/
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#include <linux/io.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include "acrn_drv.h"
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static int modify_region(struct acrn_vm *vm, struct vm_memory_region_op *region)
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{
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struct vm_memory_region_batch *regions;
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int ret;
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regions = kzalloc(sizeof(*regions), GFP_KERNEL);
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if (!regions)
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return -ENOMEM;
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regions->vmid = vm->vmid;
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regions->regions_num = 1;
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regions->regions_gpa = virt_to_phys(region);
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ret = hcall_set_memory_regions(virt_to_phys(regions));
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if (ret < 0)
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dev_dbg(acrn_dev.this_device,
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"Failed to set memory region for VM[%u]!\n", vm->vmid);
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kfree(regions);
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return ret;
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}
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/**
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* acrn_mm_region_add() - Set up the EPT mapping of a memory region.
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* @vm: User VM.
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* @user_gpa: A GPA of User VM.
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* @service_gpa: A GPA of Service VM.
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* @size: Size of the region.
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* @mem_type: Combination of ACRN_MEM_TYPE_*.
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* @mem_access_right: Combination of ACRN_MEM_ACCESS_*.
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*
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* Return: 0 on success, <0 on error.
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*/
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int acrn_mm_region_add(struct acrn_vm *vm, u64 user_gpa, u64 service_gpa,
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u64 size, u32 mem_type, u32 mem_access_right)
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{
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struct vm_memory_region_op *region;
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int ret = 0;
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region = kzalloc(sizeof(*region), GFP_KERNEL);
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if (!region)
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return -ENOMEM;
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region->type = ACRN_MEM_REGION_ADD;
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region->user_vm_pa = user_gpa;
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region->service_vm_pa = service_gpa;
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region->size = size;
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region->attr = ((mem_type & ACRN_MEM_TYPE_MASK) |
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(mem_access_right & ACRN_MEM_ACCESS_RIGHT_MASK));
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ret = modify_region(vm, region);
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dev_dbg(acrn_dev.this_device,
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"%s: user-GPA[%pK] service-GPA[%pK] size[0x%llx].\n",
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__func__, (void *)user_gpa, (void *)service_gpa, size);
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kfree(region);
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return ret;
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}
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/**
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* acrn_mm_region_del() - Del the EPT mapping of a memory region.
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* @vm: User VM.
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* @user_gpa: A GPA of the User VM.
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* @size: Size of the region.
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*
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* Return: 0 on success, <0 for error.
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*/
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int acrn_mm_region_del(struct acrn_vm *vm, u64 user_gpa, u64 size)
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{
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struct vm_memory_region_op *region;
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int ret = 0;
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region = kzalloc(sizeof(*region), GFP_KERNEL);
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if (!region)
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return -ENOMEM;
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region->type = ACRN_MEM_REGION_DEL;
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region->user_vm_pa = user_gpa;
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region->service_vm_pa = 0UL;
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region->size = size;
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region->attr = 0U;
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ret = modify_region(vm, region);
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dev_dbg(acrn_dev.this_device, "%s: user-GPA[%pK] size[0x%llx].\n",
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__func__, (void *)user_gpa, size);
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kfree(region);
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return ret;
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}
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int acrn_vm_memseg_map(struct acrn_vm *vm, struct acrn_vm_memmap *memmap)
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{
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int ret;
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if (memmap->type == ACRN_MEMMAP_RAM)
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return acrn_vm_ram_map(vm, memmap);
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if (memmap->type != ACRN_MEMMAP_MMIO) {
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dev_dbg(acrn_dev.this_device,
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"Invalid memmap type: %u\n", memmap->type);
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return -EINVAL;
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}
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ret = acrn_mm_region_add(vm, memmap->user_vm_pa,
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memmap->service_vm_pa, memmap->len,
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ACRN_MEM_TYPE_UC, memmap->attr);
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if (ret < 0)
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dev_dbg(acrn_dev.this_device,
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"Add memory region failed, VM[%u]!\n", vm->vmid);
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return ret;
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}
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int acrn_vm_memseg_unmap(struct acrn_vm *vm, struct acrn_vm_memmap *memmap)
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{
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int ret;
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if (memmap->type != ACRN_MEMMAP_MMIO) {
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dev_dbg(acrn_dev.this_device,
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"Invalid memmap type: %u\n", memmap->type);
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return -EINVAL;
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}
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ret = acrn_mm_region_del(vm, memmap->user_vm_pa, memmap->len);
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if (ret < 0)
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dev_dbg(acrn_dev.this_device,
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"Del memory region failed, VM[%u]!\n", vm->vmid);
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return ret;
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}
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/**
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* acrn_vm_ram_map() - Create a RAM EPT mapping of User VM.
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* @vm: The User VM pointer
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* @memmap: Info of the EPT mapping
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*
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* Return: 0 on success, <0 for error.
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*/
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int acrn_vm_ram_map(struct acrn_vm *vm, struct acrn_vm_memmap *memmap)
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{
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struct vm_memory_region_batch *regions_info;
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int nr_pages, i = 0, order, nr_regions = 0;
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struct vm_memory_mapping *region_mapping;
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struct vm_memory_region_op *vm_region;
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struct page **pages = NULL, *page;
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void *remap_vaddr;
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int ret, pinned;
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u64 user_vm_pa;
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unsigned long pfn;
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struct vm_area_struct *vma;
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if (!vm || !memmap)
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return -EINVAL;
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mmap_read_lock(current->mm);
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vma = vma_lookup(current->mm, memmap->vma_base);
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if (vma && ((vma->vm_flags & VM_PFNMAP) != 0)) {
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if ((memmap->vma_base + memmap->len) > vma->vm_end) {
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mmap_read_unlock(current->mm);
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return -EINVAL;
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}
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ret = follow_pfn(vma, memmap->vma_base, &pfn);
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mmap_read_unlock(current->mm);
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if (ret < 0) {
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dev_dbg(acrn_dev.this_device,
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"Failed to lookup PFN at VMA:%pK.\n", (void *)memmap->vma_base);
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return ret;
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}
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return acrn_mm_region_add(vm, memmap->user_vm_pa,
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PFN_PHYS(pfn), memmap->len,
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ACRN_MEM_TYPE_WB, memmap->attr);
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}
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mmap_read_unlock(current->mm);
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/* Get the page number of the map region */
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nr_pages = memmap->len >> PAGE_SHIFT;
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pages = vzalloc(array_size(nr_pages, sizeof(*pages)));
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if (!pages)
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return -ENOMEM;
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/* Lock the pages of user memory map region */
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pinned = pin_user_pages_fast(memmap->vma_base,
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nr_pages, FOLL_WRITE | FOLL_LONGTERM,
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pages);
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if (pinned < 0) {
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ret = pinned;
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goto free_pages;
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} else if (pinned != nr_pages) {
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ret = -EFAULT;
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goto put_pages;
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}
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/* Create a kernel map for the map region */
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remap_vaddr = vmap(pages, nr_pages, VM_MAP, PAGE_KERNEL);
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if (!remap_vaddr) {
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ret = -ENOMEM;
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goto put_pages;
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}
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/* Record Service VM va <-> User VM pa mapping */
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mutex_lock(&vm->regions_mapping_lock);
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region_mapping = &vm->regions_mapping[vm->regions_mapping_count];
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if (vm->regions_mapping_count < ACRN_MEM_MAPPING_MAX) {
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region_mapping->pages = pages;
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region_mapping->npages = nr_pages;
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region_mapping->size = memmap->len;
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region_mapping->service_vm_va = remap_vaddr;
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region_mapping->user_vm_pa = memmap->user_vm_pa;
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vm->regions_mapping_count++;
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} else {
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dev_warn(acrn_dev.this_device,
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"Run out of memory mapping slots!\n");
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ret = -ENOMEM;
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mutex_unlock(&vm->regions_mapping_lock);
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goto unmap_no_count;
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}
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mutex_unlock(&vm->regions_mapping_lock);
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/* Calculate count of vm_memory_region_op */
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while (i < nr_pages) {
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page = pages[i];
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VM_BUG_ON_PAGE(PageTail(page), page);
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order = compound_order(page);
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nr_regions++;
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i += 1 << order;
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}
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/* Prepare the vm_memory_region_batch */
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regions_info = kzalloc(struct_size(regions_info, regions_op,
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nr_regions), GFP_KERNEL);
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if (!regions_info) {
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ret = -ENOMEM;
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goto unmap_kernel_map;
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}
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/* Fill each vm_memory_region_op */
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vm_region = regions_info->regions_op;
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regions_info->vmid = vm->vmid;
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regions_info->regions_num = nr_regions;
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regions_info->regions_gpa = virt_to_phys(vm_region);
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user_vm_pa = memmap->user_vm_pa;
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i = 0;
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while (i < nr_pages) {
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u32 region_size;
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page = pages[i];
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VM_BUG_ON_PAGE(PageTail(page), page);
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order = compound_order(page);
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region_size = PAGE_SIZE << order;
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vm_region->type = ACRN_MEM_REGION_ADD;
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vm_region->user_vm_pa = user_vm_pa;
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vm_region->service_vm_pa = page_to_phys(page);
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vm_region->size = region_size;
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vm_region->attr = (ACRN_MEM_TYPE_WB & ACRN_MEM_TYPE_MASK) |
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(memmap->attr & ACRN_MEM_ACCESS_RIGHT_MASK);
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vm_region++;
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user_vm_pa += region_size;
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i += 1 << order;
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}
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/* Inform the ACRN Hypervisor to set up EPT mappings */
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ret = hcall_set_memory_regions(virt_to_phys(regions_info));
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if (ret < 0) {
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dev_dbg(acrn_dev.this_device,
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"Failed to set regions, VM[%u]!\n", vm->vmid);
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goto unset_region;
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}
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kfree(regions_info);
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dev_dbg(acrn_dev.this_device,
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"%s: VM[%u] service-GVA[%pK] user-GPA[%pK] size[0x%llx]\n",
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__func__, vm->vmid,
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remap_vaddr, (void *)memmap->user_vm_pa, memmap->len);
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return ret;
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unset_region:
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kfree(regions_info);
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unmap_kernel_map:
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mutex_lock(&vm->regions_mapping_lock);
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vm->regions_mapping_count--;
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mutex_unlock(&vm->regions_mapping_lock);
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unmap_no_count:
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vunmap(remap_vaddr);
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put_pages:
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for (i = 0; i < pinned; i++)
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unpin_user_page(pages[i]);
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free_pages:
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vfree(pages);
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return ret;
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}
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/**
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* acrn_vm_all_ram_unmap() - Destroy a RAM EPT mapping of User VM.
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* @vm: The User VM
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*/
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void acrn_vm_all_ram_unmap(struct acrn_vm *vm)
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{
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struct vm_memory_mapping *region_mapping;
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int i, j;
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mutex_lock(&vm->regions_mapping_lock);
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for (i = 0; i < vm->regions_mapping_count; i++) {
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region_mapping = &vm->regions_mapping[i];
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vunmap(region_mapping->service_vm_va);
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for (j = 0; j < region_mapping->npages; j++)
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unpin_user_page(region_mapping->pages[j]);
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vfree(region_mapping->pages);
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}
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mutex_unlock(&vm->regions_mapping_lock);
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}
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