1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2020 - Google LLC
4 * Author: Quentin Perret <qperret@google.com>
7 #include <linux/kvm_host.h>
8 #include <linux/memblock.h>
9 #include <linux/sort.h>
11 #include <asm/kvm_host.h>
13 #include <nvhe/memory.h>
16 static struct memblock_region *hyp_memory = kvm_nvhe_sym(hyp_memory);
17 static unsigned int *hyp_memblock_nr_ptr = &kvm_nvhe_sym(hyp_memblock_nr);
19 phys_addr_t hyp_mem_base;
20 phys_addr_t hyp_mem_size;
22 static int cmp_hyp_memblock(const void *p1, const void *p2)
24 const struct memblock_region *r1 = p1;
25 const struct memblock_region *r2 = p2;
27 return r1->base < r2->base ? -1 : (r1->base > r2->base);
30 static void __init sort_memblock_regions(void)
34 sizeof(struct memblock_region),
39 static int __init register_memblock_regions(void)
41 struct memblock_region *reg;
43 for_each_mem_region(reg) {
44 if (*hyp_memblock_nr_ptr >= HYP_MEMBLOCK_REGIONS)
47 hyp_memory[*hyp_memblock_nr_ptr] = *reg;
48 (*hyp_memblock_nr_ptr)++;
50 sort_memblock_regions();
55 void __init kvm_hyp_reserve(void)
57 u64 nr_pages, prev, hyp_mem_pages = 0;
60 if (!is_hyp_mode_available() || is_kernel_in_hyp_mode())
63 if (kvm_get_mode() != KVM_MODE_PROTECTED)
66 ret = register_memblock_regions();
68 *hyp_memblock_nr_ptr = 0;
69 kvm_err("Failed to register hyp memblocks: %d\n", ret);
73 hyp_mem_pages += hyp_s1_pgtable_pages();
74 hyp_mem_pages += host_s2_pgtable_pages();
77 * The hyp_vmemmap needs to be backed by pages, but these pages
78 * themselves need to be present in the vmemmap, so compute the number
79 * of pages needed by looking for a fixed point.
84 nr_pages = hyp_mem_pages + prev;
85 nr_pages = DIV_ROUND_UP(nr_pages * sizeof(struct hyp_page), PAGE_SIZE);
86 nr_pages += __hyp_pgtable_max_pages(nr_pages);
87 } while (nr_pages != prev);
88 hyp_mem_pages += nr_pages;
91 * Try to allocate a PMD-aligned region to reduce TLB pressure once
92 * this is unmapped from the host stage-2, and fallback to PAGE_SIZE.
94 hyp_mem_size = hyp_mem_pages << PAGE_SHIFT;
95 hyp_mem_base = memblock_find_in_range(0, memblock_end_of_DRAM(),
96 ALIGN(hyp_mem_size, PMD_SIZE),
99 hyp_mem_base = memblock_find_in_range(0, memblock_end_of_DRAM(),
100 hyp_mem_size, PAGE_SIZE);
102 hyp_mem_size = ALIGN(hyp_mem_size, PMD_SIZE);
105 kvm_err("Failed to reserve hyp memory\n");
108 memblock_reserve(hyp_mem_base, hyp_mem_size);
110 kvm_info("Reserved %lld MiB at 0x%llx\n", hyp_mem_size >> 20,