| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * Copyright (C) 2020 Google LLC |
| * Author: Quentin Perret <qperret@google.com> |
| */ |
| |
| #ifndef __KVM_NVHE_MEM_PROTECT__ |
| #define __KVM_NVHE_MEM_PROTECT__ |
| #include <linux/kvm_host.h> |
| #include <asm/kvm_hyp.h> |
| #include <asm/kvm_pgtable.h> |
| #include <asm/virt.h> |
| #include <nvhe/spinlock.h> |
| |
| /* |
| * SW bits 0-1 are reserved to track the memory ownership state of each page: |
| * 00: The page is owned exclusively by the page-table owner. |
| * 01: The page is owned by the page-table owner, but is shared |
| * with another entity. |
| * 10: The page is shared with, but not owned by the page-table owner. |
| * 11: Reserved for future use (lending). |
| */ |
| enum pkvm_page_state { |
| PKVM_PAGE_OWNED = 0ULL, |
| PKVM_PAGE_SHARED_OWNED = KVM_PGTABLE_PROT_SW0, |
| PKVM_PAGE_SHARED_BORROWED = KVM_PGTABLE_PROT_SW1, |
| }; |
| |
| #define PKVM_PAGE_STATE_PROT_MASK (KVM_PGTABLE_PROT_SW0 | KVM_PGTABLE_PROT_SW1) |
| static inline enum kvm_pgtable_prot pkvm_mkstate(enum kvm_pgtable_prot prot, |
| enum pkvm_page_state state) |
| { |
| return (prot & ~PKVM_PAGE_STATE_PROT_MASK) | state; |
| } |
| |
| static inline enum pkvm_page_state pkvm_getstate(enum kvm_pgtable_prot prot) |
| { |
| return prot & PKVM_PAGE_STATE_PROT_MASK; |
| } |
| |
| struct host_kvm { |
| struct kvm_arch arch; |
| struct kvm_pgtable pgt; |
| struct kvm_pgtable_mm_ops mm_ops; |
| hyp_spinlock_t lock; |
| }; |
| extern struct host_kvm host_kvm; |
| |
| extern const u8 pkvm_hyp_id; |
| |
| int __pkvm_prot_finalize(void); |
| int __pkvm_host_share_hyp(u64 pfn); |
| |
| bool addr_is_memory(phys_addr_t phys); |
| int host_stage2_idmap_locked(phys_addr_t addr, u64 size, enum kvm_pgtable_prot prot); |
| int host_stage2_set_owner_locked(phys_addr_t addr, u64 size, u8 owner_id); |
| int kvm_host_prepare_stage2(void *pgt_pool_base); |
| void handle_host_mem_abort(struct kvm_cpu_context *host_ctxt); |
| |
| static __always_inline void __load_host_stage2(void) |
| { |
| if (static_branch_likely(&kvm_protected_mode_initialized)) |
| __load_stage2(&host_kvm.arch.mmu, &host_kvm.arch); |
| else |
| write_sysreg(0, vttbr_el2); |
| } |
| #endif /* __KVM_NVHE_MEM_PROTECT__ */ |