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 */ 23 enum 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) 30 static 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 36 static inline enum pkvm_page_state pkvm_getstate(enum kvm_pgtable_prot prot) 37 { 38 return prot & PKVM_PAGE_STATE_PROT_MASK; 39 } 40 41 struct 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 }; 47 extern struct host_kvm host_kvm; 48 49 int __pkvm_prot_finalize(void); 50 int __pkvm_mark_hyp(phys_addr_t start, phys_addr_t end); 51 52 int kvm_host_prepare_stage2(void *pgt_pool_base); 53 void handle_host_mem_abort(struct kvm_cpu_context *host_ctxt); 54 55 static __always_inline void __load_host_stage2(void) 56 { 57 if (static_branch_likely(&kvm_protected_mode_initialized)) 58 __load_stage2(&host_kvm.arch.mmu, host_kvm.arch.vtcr); 59 else 60 write_sysreg(0, vttbr_el2); 61 } 62 #endif /* __KVM_NVHE_MEM_PROTECT__ */ 63