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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2020 Google LLC
* Author: Quentin Perret <[email protected]>
*/
#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__ */
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