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