LXR linux/arch/arm64/kvm/hyp/include/nvhe/mem

   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};
  28
  29#define PKVM_PAGE_STATE_PROT_MASK       (KVM_PGTABLE_PROT_SW0 | KVM_PGTABLE_PROT_SW1)
  30static inline enum kvm_pgtable_prot pkvm_mkstate(enum kvm_pgtable_prot prot,
  31                                                 enum pkvm_page_state state)
  32{
  33        return (prot & ~PKVM_PAGE_STATE_PROT_MASK) | state;
  34}
  35
  36static inline enum pkvm_page_state pkvm_getstate(enum kvm_pgtable_prot prot)
  37{
  38        return prot & PKVM_PAGE_STATE_PROT_MASK;
  39}
  40
  41struct host_kvm {
  42        struct kvm_arch arch;
  43        struct kvm_pgtable pgt;
  44        struct kvm_pgtable_mm_ops mm_ops;
  45        hyp_spinlock_t lock;
  46};
  47extern struct host_kvm host_kvm;
  48
  49extern const u8 pkvm_hyp_id;
  50
  51int __pkvm_prot_finalize(void);
  52int __pkvm_host_share_hyp(u64 pfn);
  53
  54bool addr_is_memory(phys_addr_t phys);
  55int host_stage2_idmap_locked(phys_addr_t addr, u64 size, enum kvm_pgtable_prot prot);
  56int host_stage2_set_owner_locked(phys_addr_t addr, u64 size, u8 owner_id);
  57int kvm_host_prepare_stage2(void *pgt_pool_base);
  58void handle_host_mem_abort(struct kvm_cpu_context *host_ctxt);
  59
  60static __always_inline void __load_host_stage2(void)
  61{
  62        if (static_branch_likely(&kvm_protected_mode_initialized))
  63                __load_stage2(&host_kvm.arch.mmu, &host_kvm.arch);
  64        else
  65                write_sysreg(0, vttbr_el2);
  66}
  67#endif /* __KVM_NVHE_MEM_PROTECT__ */
  68