| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright (C) 2020 - Google LLC |
| * Author: Quentin Perret <qperret@google.com> |
| */ |
| |
| #include <linux/kvm_host.h> |
| #include <linux/memblock.h> |
| #include <linux/sort.h> |
| |
| #include <asm/kvm_pkvm.h> |
| |
| #include "hyp_constants.h" |
| |
| static struct memblock_region *hyp_memory = kvm_nvhe_sym(hyp_memory); |
| static unsigned int *hyp_memblock_nr_ptr = &kvm_nvhe_sym(hyp_memblock_nr); |
| |
| phys_addr_t hyp_mem_base; |
| phys_addr_t hyp_mem_size; |
| |
| static int cmp_hyp_memblock(const void *p1, const void *p2) |
| { |
| const struct memblock_region *r1 = p1; |
| const struct memblock_region *r2 = p2; |
| |
| return r1->base < r2->base ? -1 : (r1->base > r2->base); |
| } |
| |
| static void __init sort_memblock_regions(void) |
| { |
| sort(hyp_memory, |
| *hyp_memblock_nr_ptr, |
| sizeof(struct memblock_region), |
| cmp_hyp_memblock, |
| NULL); |
| } |
| |
| static int __init register_memblock_regions(void) |
| { |
| struct memblock_region *reg; |
| |
| for_each_mem_region(reg) { |
| if (*hyp_memblock_nr_ptr >= HYP_MEMBLOCK_REGIONS) |
| return -ENOMEM; |
| |
| hyp_memory[*hyp_memblock_nr_ptr] = *reg; |
| (*hyp_memblock_nr_ptr)++; |
| } |
| sort_memblock_regions(); |
| |
| return 0; |
| } |
| |
| void __init kvm_hyp_reserve(void) |
| { |
| u64 nr_pages, prev, hyp_mem_pages = 0; |
| int ret; |
| |
| if (!is_hyp_mode_available() || is_kernel_in_hyp_mode()) |
| return; |
| |
| if (kvm_get_mode() != KVM_MODE_PROTECTED) |
| return; |
| |
| ret = register_memblock_regions(); |
| if (ret) { |
| *hyp_memblock_nr_ptr = 0; |
| kvm_err("Failed to register hyp memblocks: %d\n", ret); |
| return; |
| } |
| |
| hyp_mem_pages += hyp_s1_pgtable_pages(); |
| hyp_mem_pages += host_s2_pgtable_pages(); |
| |
| /* |
| * The hyp_vmemmap needs to be backed by pages, but these pages |
| * themselves need to be present in the vmemmap, so compute the number |
| * of pages needed by looking for a fixed point. |
| */ |
| nr_pages = 0; |
| do { |
| prev = nr_pages; |
| nr_pages = hyp_mem_pages + prev; |
| nr_pages = DIV_ROUND_UP(nr_pages * STRUCT_HYP_PAGE_SIZE, |
| PAGE_SIZE); |
| nr_pages += __hyp_pgtable_max_pages(nr_pages); |
| } while (nr_pages != prev); |
| hyp_mem_pages += nr_pages; |
| |
| /* |
| * Try to allocate a PMD-aligned region to reduce TLB pressure once |
| * this is unmapped from the host stage-2, and fallback to PAGE_SIZE. |
| */ |
| hyp_mem_size = hyp_mem_pages << PAGE_SHIFT; |
| hyp_mem_base = memblock_phys_alloc(ALIGN(hyp_mem_size, PMD_SIZE), |
| PMD_SIZE); |
| if (!hyp_mem_base) |
| hyp_mem_base = memblock_phys_alloc(hyp_mem_size, PAGE_SIZE); |
| else |
| hyp_mem_size = ALIGN(hyp_mem_size, PMD_SIZE); |
| |
| if (!hyp_mem_base) { |
| kvm_err("Failed to reserve hyp memory\n"); |
| return; |
| } |
| |
| kvm_info("Reserved %lld MiB at 0x%llx\n", hyp_mem_size >> 20, |
| hyp_mem_base); |
| } |