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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* The host<->hyp hypercall interface.
*
* Copyright (C) 2026 Google LLC
* Author: Fuad Tabba <fuad.tabba@linux.dev>
*/
#ifndef __ARM64_KVM_HCALL_H__
#define __ARM64_KVM_HCALL_H__
#include <linux/args.h>
#include <linux/arm-smccc.h>
#include <linux/bug.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <asm/barrier.h>
#include <asm/kvm_asm.h>
#include <asm/spectre.h>
#include <asm/virt.h>
typedef u16 pkvm_handle_t;
enum pkvm_topup_id {
PKVM_TOPUP_HYP_ALLOC,
NR_PKVM_TOPUP_HYP_IDS,
PKVM_TOPUP_HYP_ALLOC_SELFTEST,
};
struct kvm;
struct kvm_s2_mmu;
struct kvm_vcpu;
struct vgic_v3_cpu_if;
struct vgic_v5_cpu_if;
/*
* A host VA carried by a hypercall argument. At EL2 such a pointer must not
* be dereferenced until it is translated with kern_hyp_va_host(); sparse
* flags any use that skips the translation. The tag describes the EL2 view
* only: the host dereferences its own VAs freely.
*/
#if defined(__KVM_NVHE_HYPERVISOR__) && defined(__CHECKER__)
#define __kern __attribute__((noderef, address_space(__kern)))
#else
#define __kern
#endif
/*
* Hypercall signatures are declared as (type, name) argument pairs.
* __KVM_HCALL_MAP() applies a macro to each pair, in the mold of __MAP()
* in <linux/syscalls.h>. The ladder is indexed by list entries, two per
* argument; __KVM_HCALL_MAP_N() takes that count explicitly.
*/
#define __KVM_HCALL_MAP2(m, t, a, ...) m(t, a)
#define __KVM_HCALL_MAP4(m, t, a, ...) m(t, a), __KVM_HCALL_MAP2(m, __VA_ARGS__)
#define __KVM_HCALL_MAP6(m, t, a, ...) m(t, a), __KVM_HCALL_MAP4(m, __VA_ARGS__)
#define __KVM_HCALL_MAP8(m, t, a, ...) m(t, a), __KVM_HCALL_MAP6(m, __VA_ARGS__)
#define __KVM_HCALL_MAP10(m, t, a, ...) m(t, a), __KVM_HCALL_MAP8(m, __VA_ARGS__)
#define __KVM_HCALL_MAP12(m, t, a, ...) m(t, a), __KVM_HCALL_MAP10(m, __VA_ARGS__)
#define __KVM_HCALL_MAP_N(n, m, ...) CONCATENATE(__KVM_HCALL_MAP, n)(m, __VA_ARGS__)
#define __KVM_HCALL_MAP(m, ...) __KVM_HCALL_MAP_N(COUNT_ARGS(__VA_ARGS__), m, __VA_ARGS__)
#define __KVM_HCALL_DECL(t, a) t a
#define __KVM_HCALL_LONG(t, a) unsigned long a
#define __KVM_HCALL_CAST(t, a) (__force t) a
#define __KVM_HCALL_ARGS(t, a) a
#ifndef __KVM_NVHE_HYPERVISOR__
#define __kvm_call_hyp_nvhe(f, ...) \
({ \
struct arm_smccc_res res; \
\
arm_smccc_1_1_hvc(KVM_HOST_SMCCC_FUNC(f), \
##__VA_ARGS__, &res); \
if (WARN_ON(res.a0 != SMCCC_RET_SUCCESS)) \
res.a1 = -EOPNOTSUPP; \
\
res.a1; \
})
/*
* Generate a typed stub for each declared hypercall. kvm_call_hyp_nvhe()
* resolves to the stub, so a call with the wrong argument count or types
* fails to compile instead of being silently truncated to an SMCCC function
* number and a pile of registers. The stub inlines to the same SMCCC call
* the untyped macro used to make.
*/
#define DECLARE_KVM_HOST_HCALL(ret, name, ...) \
static __always_inline \
ret nvhe_hvc_##name(__KVM_HCALL_MAP(__KVM_HCALL_DECL, __VA_ARGS__)) \
{ \
return (ret)__kvm_call_hyp_nvhe(name, \
__KVM_HCALL_MAP(__KVM_HCALL_ARGS, __VA_ARGS__));\
}
#define DECLARE_KVM_HOST_HCALL0(ret, name) \
static __always_inline ret nvhe_hvc_##name(void) \
{ \
return (ret)__kvm_call_hyp_nvhe(name); \
}
#define kvm_call_hyp_nvhe(f, ...) nvhe_hvc_##f(__VA_ARGS__)
/*
* The isb() below is there to guarantee the same behaviour on VHE as on !VHE,
* where the eret to EL1 acts as a context synchronization event.
*/
#define kvm_call_hyp(f, ...) \
do { \
if (has_vhe()) { \
f(__VA_ARGS__); \
isb(); \
} else { \
kvm_call_hyp_nvhe(f, ##__VA_ARGS__); \
} \
} while (0)
#define kvm_call_hyp_ret(f, ...) \
({ \
typeof(f(__VA_ARGS__)) ret; \
\
if (has_vhe()) { \
ret = f(__VA_ARGS__); \
} else { \
ret = kvm_call_hyp_nvhe(f, ##__VA_ARGS__); \
} \
\
ret; \
})
#else /* __KVM_NVHE_HYPERVISOR__ */
#define kvm_call_hyp(f, ...) f(__VA_ARGS__)
#define kvm_call_hyp_ret(f, ...) f(__VA_ARGS__)
#define kvm_call_hyp_nvhe(f, ...) f(__VA_ARGS__)
/*
* At EL2 each declaration emits the canonical signature of the hypercall,
* which DEFINE_KVM_HOST_HCALL() in hyp-main.c checks the handler
* definition against.
*/
#define DECLARE_KVM_HOST_HCALL(ret, name, ...) \
typedef ret kvm_host_hcall_sig_##name(__KVM_HCALL_MAP(__KVM_HCALL_DECL, __VA_ARGS__));
#define DECLARE_KVM_HOST_HCALL0(ret, name) \
typedef ret kvm_host_hcall_sig_##name(void);
#endif /* __KVM_NVHE_HYPERVISOR__ */
/* Hypercalls that are unavailable once pKVM has finalised. */
DECLARE_KVM_HOST_HCALL(int, __pkvm_init,
phys_addr_t, phys, unsigned long, size,
unsigned long *, per_cpu_base, u32, hyp_va_bits)
DECLARE_KVM_HOST_HCALL(ulong, __pkvm_create_private_mapping,
phys_addr_t, phys, size_t, size, u64, prot)
DECLARE_KVM_HOST_HCALL(int, __pkvm_cpu_set_vector,
enum arm64_hyp_spectre_vector, slot)
DECLARE_KVM_HOST_HCALL0(void, __kvm_enable_ssbs)
DECLARE_KVM_HOST_HCALL0(void, __vgic_v3_init_lrs)
DECLARE_KVM_HOST_HCALL0(u64, __vgic_v3_get_gic_config)
DECLARE_KVM_HOST_HCALL0(int, __pkvm_hyp_alloc_selftest)
DECLARE_KVM_HOST_HCALL0(int, __pkvm_prot_finalize)
/* Hypercalls that are always available and common to [nh]VHE/pKVM. */
DECLARE_KVM_HOST_HCALL(void, __kvm_adjust_pc,
struct kvm_vcpu __kern *, vcpu)
DECLARE_KVM_HOST_HCALL(int, __kvm_vcpu_run,
struct kvm_vcpu __kern *, vcpu)
DECLARE_KVM_HOST_HCALL0(void, __kvm_flush_vm_context)
DECLARE_KVM_HOST_HCALL(void, __kvm_tlb_flush_vmid_ipa,
struct kvm_s2_mmu __kern *, mmu, phys_addr_t, ipa, int, level)
DECLARE_KVM_HOST_HCALL(void, __kvm_tlb_flush_vmid_ipa_nsh,
struct kvm_s2_mmu __kern *, mmu, phys_addr_t, ipa, int, level)
DECLARE_KVM_HOST_HCALL(void, __kvm_tlb_flush_vmid,
struct kvm_s2_mmu __kern *, mmu)
DECLARE_KVM_HOST_HCALL(void, __kvm_tlb_flush_vmid_range,
struct kvm_s2_mmu __kern *, mmu, phys_addr_t, start, unsigned long, pages)
DECLARE_KVM_HOST_HCALL(void, __kvm_flush_cpu_context,
struct kvm_s2_mmu __kern *, mmu)
DECLARE_KVM_HOST_HCALL(void, __kvm_timer_set_cntvoff,
u64, cntvoff)
DECLARE_KVM_HOST_HCALL(int, __tracing_load,
void __kern *, desc_hva, size_t, desc_size)
DECLARE_KVM_HOST_HCALL0(void, __tracing_unload)
DECLARE_KVM_HOST_HCALL(int, __tracing_enable,
bool, enable)
DECLARE_KVM_HOST_HCALL(int, __tracing_swap_reader,
unsigned int, cpu)
DECLARE_KVM_HOST_HCALL(void, __tracing_update_clock,
u32, mult, u32, shift, u64, epoch_ns, u64, epoch_cyc)
DECLARE_KVM_HOST_HCALL(int, __tracing_reset,
unsigned int, cpu)
DECLARE_KVM_HOST_HCALL(int, __tracing_enable_event,
unsigned short, id, bool, enable)
DECLARE_KVM_HOST_HCALL(void, __tracing_write_event,
u64, id)
DECLARE_KVM_HOST_HCALL(void, __vgic_v5_make_resident,
struct vgic_v5_cpu_if __kern *, cpu_if);
DECLARE_KVM_HOST_HCALL(void, __vgic_v5_make_non_resident,
struct vgic_v5_cpu_if __kern *, cpu_if);
DECLARE_KVM_HOST_HCALL(void, __vgic_v3_save_aprs,
struct vgic_v3_cpu_if __kern *, cpu_if)
DECLARE_KVM_HOST_HCALL(void, __vgic_v3_restore_vmcr_aprs,
struct vgic_v3_cpu_if __kern *, cpu_if)
DECLARE_KVM_HOST_HCALL(void, __vgic_v5_save_apr,
struct vgic_v5_cpu_if __kern *, cpu_if)
DECLARE_KVM_HOST_HCALL(void, __vgic_v5_restore_vmcr_apr,
struct vgic_v5_cpu_if __kern *, cpu_if)
DECLARE_KVM_HOST_HCALL(void, __vgic_v5_vdpend,
u32, intid, bool, pending, u16, vm);
DECLARE_KVM_HOST_HCALL(int, __pkvm_hyp_topup,
enum pkvm_topup_id, id, phys_addr_t, head, unsigned long, nr_pages)
DECLARE_KVM_HOST_HCALL(int, __pkvm_hyp_reclaim,
enum pkvm_topup_id, id, unsigned long, target)
DECLARE_KVM_HOST_HCALL(ulong, __pkvm_hyp_reclaimable,
enum pkvm_topup_id, id)
/* Hypercalls that are available only when pKVM has finalised. */
DECLARE_KVM_HOST_HCALL(int, __pkvm_host_share_hyp,
u64, pfn)
DECLARE_KVM_HOST_HCALL(int, __pkvm_host_unshare_hyp,
u64, pfn)
DECLARE_KVM_HOST_HCALL(int, __pkvm_host_donate_guest,
u64, pfn, u64, gfn)
DECLARE_KVM_HOST_HCALL(int, __pkvm_host_share_guest,
u64, pfn, u64, gfn, u64, nr_pages, u64, prot)
DECLARE_KVM_HOST_HCALL(int, __pkvm_host_unshare_guest,
pkvm_handle_t, handle, u64, gfn, u64, nr_pages)
DECLARE_KVM_HOST_HCALL(int, __pkvm_host_relax_perms_guest,
u64, gfn, u64, prot)
DECLARE_KVM_HOST_HCALL(int, __pkvm_host_wrprotect_guest,
pkvm_handle_t, handle, u64, gfn, u64, nr_pages)
DECLARE_KVM_HOST_HCALL(int, __pkvm_host_test_clear_young_guest,
pkvm_handle_t, handle, u64, gfn, u64, nr_pages, bool, mkold)
DECLARE_KVM_HOST_HCALL(int, __pkvm_host_mkyoung_guest,
u64, gfn)
DECLARE_KVM_HOST_HCALL0(int, __pkvm_reserve_vm)
DECLARE_KVM_HOST_HCALL(void, __pkvm_unreserve_vm,
pkvm_handle_t, handle)
DECLARE_KVM_HOST_HCALL(int, __pkvm_init_vm,
struct kvm __kern *, host_kvm, void __kern *, pgd_hva)
DECLARE_KVM_HOST_HCALL(int, __pkvm_init_vcpu,
pkvm_handle_t, handle, struct kvm_vcpu __kern *, host_vcpu)
DECLARE_KVM_HOST_HCALL0(int, __pkvm_vcpu_in_poison_fault)
DECLARE_KVM_HOST_HCALL(int, __pkvm_force_reclaim_guest_page,
phys_addr_t, phys)
DECLARE_KVM_HOST_HCALL(int, __pkvm_reclaim_dying_guest_page,
pkvm_handle_t, handle, u64, gfn)
DECLARE_KVM_HOST_HCALL(int, __pkvm_start_teardown_vm,
pkvm_handle_t, handle)
DECLARE_KVM_HOST_HCALL(int, __pkvm_finalize_teardown_vm,
pkvm_handle_t, handle)
DECLARE_KVM_HOST_HCALL(void, __pkvm_vcpu_load,
pkvm_handle_t, handle, unsigned int, vcpu_idx, u64, hcr_el2)
DECLARE_KVM_HOST_HCALL0(void, __pkvm_vcpu_put)
DECLARE_KVM_HOST_HCALL0(void, __pkvm_vcpu_sync_state)
DECLARE_KVM_HOST_HCALL(void, __pkvm_tlb_flush_vmid,
pkvm_handle_t, handle)
#endif /* __ARM64_KVM_HCALL_H__ */
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