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