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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mem_protect.h (2237B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * Copyright (C) 2020 Google LLC
      4 * Author: Quentin Perret <qperret@google.com>
      5 */
      6
      7#ifndef __KVM_NVHE_MEM_PROTECT__
      8#define __KVM_NVHE_MEM_PROTECT__
      9#include <linux/kvm_host.h>
     10#include <asm/kvm_hyp.h>
     11#include <asm/kvm_pgtable.h>
     12#include <asm/virt.h>
     13#include <nvhe/spinlock.h>
     14
     15/*
     16 * SW bits 0-1 are reserved to track the memory ownership state of each page:
     17 *   00: The page is owned exclusively by the page-table owner.
     18 *   01: The page is owned by the page-table owner, but is shared
     19 *       with another entity.
     20 *   10: The page is shared with, but not owned by the page-table owner.
     21 *   11: Reserved for future use (lending).
     22 */
     23enum pkvm_page_state {
     24	PKVM_PAGE_OWNED			= 0ULL,
     25	PKVM_PAGE_SHARED_OWNED		= KVM_PGTABLE_PROT_SW0,
     26	PKVM_PAGE_SHARED_BORROWED	= KVM_PGTABLE_PROT_SW1,
     27	__PKVM_PAGE_RESERVED		= KVM_PGTABLE_PROT_SW0 |
     28					  KVM_PGTABLE_PROT_SW1,
     29
     30	/* Meta-states which aren't encoded directly in the PTE's SW bits */
     31	PKVM_NOPAGE,
     32};
     33
     34#define PKVM_PAGE_STATE_PROT_MASK	(KVM_PGTABLE_PROT_SW0 | KVM_PGTABLE_PROT_SW1)
     35static inline enum kvm_pgtable_prot pkvm_mkstate(enum kvm_pgtable_prot prot,
     36						 enum pkvm_page_state state)
     37{
     38	return (prot & ~PKVM_PAGE_STATE_PROT_MASK) | state;
     39}
     40
     41static inline enum pkvm_page_state pkvm_getstate(enum kvm_pgtable_prot prot)
     42{
     43	return prot & PKVM_PAGE_STATE_PROT_MASK;
     44}
     45
     46struct host_kvm {
     47	struct kvm_arch arch;
     48	struct kvm_pgtable pgt;
     49	struct kvm_pgtable_mm_ops mm_ops;
     50	hyp_spinlock_t lock;
     51};
     52extern struct host_kvm host_kvm;
     53
     54extern const u8 pkvm_hyp_id;
     55
     56int __pkvm_prot_finalize(void);
     57int __pkvm_host_share_hyp(u64 pfn);
     58int __pkvm_host_unshare_hyp(u64 pfn);
     59
     60bool addr_is_memory(phys_addr_t phys);
     61int host_stage2_idmap_locked(phys_addr_t addr, u64 size, enum kvm_pgtable_prot prot);
     62int host_stage2_set_owner_locked(phys_addr_t addr, u64 size, u8 owner_id);
     63int kvm_host_prepare_stage2(void *pgt_pool_base);
     64void handle_host_mem_abort(struct kvm_cpu_context *host_ctxt);
     65
     66static __always_inline void __load_host_stage2(void)
     67{
     68	if (static_branch_likely(&kvm_protected_mode_initialized))
     69		__load_stage2(&host_kvm.arch.mmu, &host_kvm.arch);
     70	else
     71		write_sysreg(0, vttbr_el2);
     72}
     73#endif /* __KVM_NVHE_MEM_PROTECT__ */