summaryrefslogtreecommitdiffstats
path: root/drivers/virt/acrn/mm.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/virt/acrn/mm.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/virt/acrn/mm.c')
-rw-r--r--drivers/virt/acrn/mm.c329
1 files changed, 329 insertions, 0 deletions
diff --git a/drivers/virt/acrn/mm.c b/drivers/virt/acrn/mm.c
new file mode 100644
index 000000000..b4ad8d452
--- /dev/null
+++ b/drivers/virt/acrn/mm.c
@@ -0,0 +1,329 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ACRN: Memory mapping management
+ *
+ * Copyright (C) 2020 Intel Corporation. All rights reserved.
+ *
+ * Authors:
+ * Fei Li <lei1.li@intel.com>
+ * Shuo Liu <shuo.a.liu@intel.com>
+ */
+
+#include <linux/io.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+
+#include "acrn_drv.h"
+
+static int modify_region(struct acrn_vm *vm, struct vm_memory_region_op *region)
+{
+ struct vm_memory_region_batch *regions;
+ int ret;
+
+ regions = kzalloc(sizeof(*regions), GFP_KERNEL);
+ if (!regions)
+ return -ENOMEM;
+
+ regions->vmid = vm->vmid;
+ regions->regions_num = 1;
+ regions->regions_gpa = virt_to_phys(region);
+
+ ret = hcall_set_memory_regions(virt_to_phys(regions));
+ if (ret < 0)
+ dev_dbg(acrn_dev.this_device,
+ "Failed to set memory region for VM[%u]!\n", vm->vmid);
+
+ kfree(regions);
+ return ret;
+}
+
+/**
+ * acrn_mm_region_add() - Set up the EPT mapping of a memory region.
+ * @vm: User VM.
+ * @user_gpa: A GPA of User VM.
+ * @service_gpa: A GPA of Service VM.
+ * @size: Size of the region.
+ * @mem_type: Combination of ACRN_MEM_TYPE_*.
+ * @mem_access_right: Combination of ACRN_MEM_ACCESS_*.
+ *
+ * Return: 0 on success, <0 on error.
+ */
+int acrn_mm_region_add(struct acrn_vm *vm, u64 user_gpa, u64 service_gpa,
+ u64 size, u32 mem_type, u32 mem_access_right)
+{
+ struct vm_memory_region_op *region;
+ int ret = 0;
+
+ region = kzalloc(sizeof(*region), GFP_KERNEL);
+ if (!region)
+ return -ENOMEM;
+
+ region->type = ACRN_MEM_REGION_ADD;
+ region->user_vm_pa = user_gpa;
+ region->service_vm_pa = service_gpa;
+ region->size = size;
+ region->attr = ((mem_type & ACRN_MEM_TYPE_MASK) |
+ (mem_access_right & ACRN_MEM_ACCESS_RIGHT_MASK));
+ ret = modify_region(vm, region);
+
+ dev_dbg(acrn_dev.this_device,
+ "%s: user-GPA[%pK] service-GPA[%pK] size[0x%llx].\n",
+ __func__, (void *)user_gpa, (void *)service_gpa, size);
+ kfree(region);
+ return ret;
+}
+
+/**
+ * acrn_mm_region_del() - Del the EPT mapping of a memory region.
+ * @vm: User VM.
+ * @user_gpa: A GPA of the User VM.
+ * @size: Size of the region.
+ *
+ * Return: 0 on success, <0 for error.
+ */
+int acrn_mm_region_del(struct acrn_vm *vm, u64 user_gpa, u64 size)
+{
+ struct vm_memory_region_op *region;
+ int ret = 0;
+
+ region = kzalloc(sizeof(*region), GFP_KERNEL);
+ if (!region)
+ return -ENOMEM;
+
+ region->type = ACRN_MEM_REGION_DEL;
+ region->user_vm_pa = user_gpa;
+ region->service_vm_pa = 0UL;
+ region->size = size;
+ region->attr = 0U;
+
+ ret = modify_region(vm, region);
+
+ dev_dbg(acrn_dev.this_device, "%s: user-GPA[%pK] size[0x%llx].\n",
+ __func__, (void *)user_gpa, size);
+ kfree(region);
+ return ret;
+}
+
+int acrn_vm_memseg_map(struct acrn_vm *vm, struct acrn_vm_memmap *memmap)
+{
+ int ret;
+
+ if (memmap->type == ACRN_MEMMAP_RAM)
+ return acrn_vm_ram_map(vm, memmap);
+
+ if (memmap->type != ACRN_MEMMAP_MMIO) {
+ dev_dbg(acrn_dev.this_device,
+ "Invalid memmap type: %u\n", memmap->type);
+ return -EINVAL;
+ }
+
+ ret = acrn_mm_region_add(vm, memmap->user_vm_pa,
+ memmap->service_vm_pa, memmap->len,
+ ACRN_MEM_TYPE_UC, memmap->attr);
+ if (ret < 0)
+ dev_dbg(acrn_dev.this_device,
+ "Add memory region failed, VM[%u]!\n", vm->vmid);
+
+ return ret;
+}
+
+int acrn_vm_memseg_unmap(struct acrn_vm *vm, struct acrn_vm_memmap *memmap)
+{
+ int ret;
+
+ if (memmap->type != ACRN_MEMMAP_MMIO) {
+ dev_dbg(acrn_dev.this_device,
+ "Invalid memmap type: %u\n", memmap->type);
+ return -EINVAL;
+ }
+
+ ret = acrn_mm_region_del(vm, memmap->user_vm_pa, memmap->len);
+ if (ret < 0)
+ dev_dbg(acrn_dev.this_device,
+ "Del memory region failed, VM[%u]!\n", vm->vmid);
+
+ return ret;
+}
+
+/**
+ * acrn_vm_ram_map() - Create a RAM EPT mapping of User VM.
+ * @vm: The User VM pointer
+ * @memmap: Info of the EPT mapping
+ *
+ * Return: 0 on success, <0 for error.
+ */
+int acrn_vm_ram_map(struct acrn_vm *vm, struct acrn_vm_memmap *memmap)
+{
+ struct vm_memory_region_batch *regions_info;
+ int nr_pages, i = 0, order, nr_regions = 0;
+ struct vm_memory_mapping *region_mapping;
+ struct vm_memory_region_op *vm_region;
+ struct page **pages = NULL, *page;
+ void *remap_vaddr;
+ int ret, pinned;
+ u64 user_vm_pa;
+ unsigned long pfn;
+ struct vm_area_struct *vma;
+
+ if (!vm || !memmap)
+ return -EINVAL;
+
+ mmap_read_lock(current->mm);
+ vma = vma_lookup(current->mm, memmap->vma_base);
+ if (vma && ((vma->vm_flags & VM_PFNMAP) != 0)) {
+ if ((memmap->vma_base + memmap->len) > vma->vm_end) {
+ mmap_read_unlock(current->mm);
+ return -EINVAL;
+ }
+
+ ret = follow_pfn(vma, memmap->vma_base, &pfn);
+ mmap_read_unlock(current->mm);
+ if (ret < 0) {
+ dev_dbg(acrn_dev.this_device,
+ "Failed to lookup PFN at VMA:%pK.\n", (void *)memmap->vma_base);
+ return ret;
+ }
+
+ return acrn_mm_region_add(vm, memmap->user_vm_pa,
+ PFN_PHYS(pfn), memmap->len,
+ ACRN_MEM_TYPE_WB, memmap->attr);
+ }
+ mmap_read_unlock(current->mm);
+
+ /* Get the page number of the map region */
+ nr_pages = memmap->len >> PAGE_SHIFT;
+ pages = vzalloc(array_size(nr_pages, sizeof(*pages)));
+ if (!pages)
+ return -ENOMEM;
+
+ /* Lock the pages of user memory map region */
+ pinned = pin_user_pages_fast(memmap->vma_base,
+ nr_pages, FOLL_WRITE | FOLL_LONGTERM,
+ pages);
+ if (pinned < 0) {
+ ret = pinned;
+ goto free_pages;
+ } else if (pinned != nr_pages) {
+ ret = -EFAULT;
+ goto put_pages;
+ }
+
+ /* Create a kernel map for the map region */
+ remap_vaddr = vmap(pages, nr_pages, VM_MAP, PAGE_KERNEL);
+ if (!remap_vaddr) {
+ ret = -ENOMEM;
+ goto put_pages;
+ }
+
+ /* Record Service VM va <-> User VM pa mapping */
+ mutex_lock(&vm->regions_mapping_lock);
+ region_mapping = &vm->regions_mapping[vm->regions_mapping_count];
+ if (vm->regions_mapping_count < ACRN_MEM_MAPPING_MAX) {
+ region_mapping->pages = pages;
+ region_mapping->npages = nr_pages;
+ region_mapping->size = memmap->len;
+ region_mapping->service_vm_va = remap_vaddr;
+ region_mapping->user_vm_pa = memmap->user_vm_pa;
+ vm->regions_mapping_count++;
+ } else {
+ dev_warn(acrn_dev.this_device,
+ "Run out of memory mapping slots!\n");
+ ret = -ENOMEM;
+ mutex_unlock(&vm->regions_mapping_lock);
+ goto unmap_no_count;
+ }
+ mutex_unlock(&vm->regions_mapping_lock);
+
+ /* Calculate count of vm_memory_region_op */
+ while (i < nr_pages) {
+ page = pages[i];
+ VM_BUG_ON_PAGE(PageTail(page), page);
+ order = compound_order(page);
+ nr_regions++;
+ i += 1 << order;
+ }
+
+ /* Prepare the vm_memory_region_batch */
+ regions_info = kzalloc(struct_size(regions_info, regions_op,
+ nr_regions), GFP_KERNEL);
+ if (!regions_info) {
+ ret = -ENOMEM;
+ goto unmap_kernel_map;
+ }
+
+ /* Fill each vm_memory_region_op */
+ vm_region = regions_info->regions_op;
+ regions_info->vmid = vm->vmid;
+ regions_info->regions_num = nr_regions;
+ regions_info->regions_gpa = virt_to_phys(vm_region);
+ user_vm_pa = memmap->user_vm_pa;
+ i = 0;
+ while (i < nr_pages) {
+ u32 region_size;
+
+ page = pages[i];
+ VM_BUG_ON_PAGE(PageTail(page), page);
+ order = compound_order(page);
+ region_size = PAGE_SIZE << order;
+ vm_region->type = ACRN_MEM_REGION_ADD;
+ vm_region->user_vm_pa = user_vm_pa;
+ vm_region->service_vm_pa = page_to_phys(page);
+ vm_region->size = region_size;
+ vm_region->attr = (ACRN_MEM_TYPE_WB & ACRN_MEM_TYPE_MASK) |
+ (memmap->attr & ACRN_MEM_ACCESS_RIGHT_MASK);
+
+ vm_region++;
+ user_vm_pa += region_size;
+ i += 1 << order;
+ }
+
+ /* Inform the ACRN Hypervisor to set up EPT mappings */
+ ret = hcall_set_memory_regions(virt_to_phys(regions_info));
+ if (ret < 0) {
+ dev_dbg(acrn_dev.this_device,
+ "Failed to set regions, VM[%u]!\n", vm->vmid);
+ goto unset_region;
+ }
+ kfree(regions_info);
+
+ dev_dbg(acrn_dev.this_device,
+ "%s: VM[%u] service-GVA[%pK] user-GPA[%pK] size[0x%llx]\n",
+ __func__, vm->vmid,
+ remap_vaddr, (void *)memmap->user_vm_pa, memmap->len);
+ return ret;
+
+unset_region:
+ kfree(regions_info);
+unmap_kernel_map:
+ mutex_lock(&vm->regions_mapping_lock);
+ vm->regions_mapping_count--;
+ mutex_unlock(&vm->regions_mapping_lock);
+unmap_no_count:
+ vunmap(remap_vaddr);
+put_pages:
+ for (i = 0; i < pinned; i++)
+ unpin_user_page(pages[i]);
+free_pages:
+ vfree(pages);
+ return ret;
+}
+
+/**
+ * acrn_vm_all_ram_unmap() - Destroy a RAM EPT mapping of User VM.
+ * @vm: The User VM
+ */
+void acrn_vm_all_ram_unmap(struct acrn_vm *vm)
+{
+ struct vm_memory_mapping *region_mapping;
+ int i, j;
+
+ mutex_lock(&vm->regions_mapping_lock);
+ for (i = 0; i < vm->regions_mapping_count; i++) {
+ region_mapping = &vm->regions_mapping[i];
+ vunmap(region_mapping->service_vm_va);
+ for (j = 0; j < region_mapping->npages; j++)
+ unpin_user_page(region_mapping->pages[j]);
+ vfree(region_mapping->pages);
+ }
+ mutex_unlock(&vm->regions_mapping_lock);
+}