cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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kvm_pkvm.h (1603B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Copyright (C) 2020 - Google LLC
      4 * Author: Quentin Perret <qperret@google.com>
      5 */
      6#ifndef __ARM64_KVM_PKVM_H__
      7#define __ARM64_KVM_PKVM_H__
      8
      9#include <linux/memblock.h>
     10#include <asm/kvm_pgtable.h>
     11
     12#define HYP_MEMBLOCK_REGIONS 128
     13
     14extern struct memblock_region kvm_nvhe_sym(hyp_memory)[];
     15extern unsigned int kvm_nvhe_sym(hyp_memblock_nr);
     16
     17static inline unsigned long __hyp_pgtable_max_pages(unsigned long nr_pages)
     18{
     19	unsigned long total = 0, i;
     20
     21	/* Provision the worst case scenario */
     22	for (i = 0; i < KVM_PGTABLE_MAX_LEVELS; i++) {
     23		nr_pages = DIV_ROUND_UP(nr_pages, PTRS_PER_PTE);
     24		total += nr_pages;
     25	}
     26
     27	return total;
     28}
     29
     30static inline unsigned long __hyp_pgtable_total_pages(void)
     31{
     32	unsigned long res = 0, i;
     33
     34	/* Cover all of memory with page-granularity */
     35	for (i = 0; i < kvm_nvhe_sym(hyp_memblock_nr); i++) {
     36		struct memblock_region *reg = &kvm_nvhe_sym(hyp_memory)[i];
     37		res += __hyp_pgtable_max_pages(reg->size >> PAGE_SHIFT);
     38	}
     39
     40	return res;
     41}
     42
     43static inline unsigned long hyp_s1_pgtable_pages(void)
     44{
     45	unsigned long res;
     46
     47	res = __hyp_pgtable_total_pages();
     48
     49	/* Allow 1 GiB for private mappings */
     50	res += __hyp_pgtable_max_pages(SZ_1G >> PAGE_SHIFT);
     51
     52	return res;
     53}
     54
     55static inline unsigned long host_s2_pgtable_pages(void)
     56{
     57	unsigned long res;
     58
     59	/*
     60	 * Include an extra 16 pages to safely upper-bound the worst case of
     61	 * concatenated pgds.
     62	 */
     63	res = __hyp_pgtable_total_pages() + 16;
     64
     65	/* Allow 1 GiB for MMIO mappings */
     66	res += __hyp_pgtable_max_pages(SZ_1G >> PAGE_SHIFT);
     67
     68	return res;
     69}
     70
     71#endif	/* __ARM64_KVM_PKVM_H__ */