// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2020 - Google Inc
 * Author: Andrew Scull <ascull@google.com>
 */

#include <kvm/arm_hypercalls.h>

#include <hyp/adjust_pc.h>
#include <hyp/switch.h>

#include <asm/pgtable-types.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_emulate.h>
#include <asm/kvm_host.h>
#include <asm/kvm_hyp.h>
#include <asm/kvm_hypevents.h>
#include <asm/kvm_mmu.h>

#include <nvhe/alloc.h>
#include <nvhe/alloc_mgt.h>
#include <nvhe/ffa.h>
#include <nvhe/iommu.h>
#include <nvhe/mem_protect.h>
#include <nvhe/modules.h>
#include <nvhe/mm.h>
#include <nvhe/pkvm.h>
#include <nvhe/pviommu-host.h>
#include <nvhe/trace.h>
#include <nvhe/trap_handler.h>

#include <linux/irqchip/arm-gic-v3.h>
#include <uapi/linux/psci.h>

#include "../../sys_regs.h"

DEFINE_PER_CPU(struct kvm_nvhe_init_params, kvm_init_params);

/*
 * Holds one request only, in theory we can compress more, but
 * typically HVC returns on first failure.
 */
DEFINE_PER_CPU(struct kvm_hyp_req, host_hyp_reqs);

/* Serialize request in SMCCC return context. */
static inline void hyp_reqs_smccc_encode(unsigned long ret, struct kvm_cpu_context *host_ctxt,
					 struct kvm_hyp_req *req)
{
	cpu_reg(host_ctxt, 1) = ret;
	cpu_reg(host_ctxt, 2) = 0;
	cpu_reg(host_ctxt, 3) = 0;

	if (req->type == KVM_HYP_REQ_TYPE_MEM) {
		cpu_reg(host_ctxt, 2) = FIELD_PREP(SMCCC_REQ_TYPE_MASK, req->type) |
					FIELD_PREP(SMCCC_REQ_DEST_MASK, req->mem.dest);

		cpu_reg(host_ctxt, 3) = FIELD_PREP(SMCCC_REQ_NR_PAGES_MASK, req->mem.nr_pages) |
					FIELD_PREP(SMCCC_REQ_SZ_ALLOC_MASK, req->mem.sz_alloc);
	}

	/* We can't encode others */
	WARN_ON((req->type != KVM_HYP_REQ_TYPE_MEM) && ((req->type != KVM_HYP_LAST_REQ)));
	req->type = KVM_HYP_LAST_REQ;
}

void __kvm_hyp_host_forward_smc(struct kvm_cpu_context *host_ctxt);

static bool (*default_trap_handler)(struct user_pt_regs *regs);
static bool (*unmask_serror)(void);
static void (*mask_serror)(void);

int __pkvm_register_default_trap_handler(bool (*cb)(struct user_pt_regs *))
{
	return cmpxchg(&default_trap_handler, NULL, cb) ? -EBUSY : 0;
}

void __pkvm_unmask_serror(void)
{
	u64 hcr = read_sysreg(HCR_EL2);

	if (!unmask_serror || !unmask_serror())
		return;

	write_sysreg(hcr | HCR_AMO, HCR_EL2);
	asm volatile("msr daifclr, #4");
	isb();
}

static void __pkvm_mask_serror(void)
{
	u64 hcr = read_sysreg(HCR_EL2);

	if (!mask_serror)
		return;

	mask_serror();

	write_sysreg(hcr & ~HCR_AMO, HCR_EL2);
	asm volatile("msr daifset, #4");
	isb();
}

int __pkvm_register_unmask_serror(bool (*unmask)(void),
				  void (*mask)(void))
{
	static bool registered;

	if (!unmask || !mask)
		return -EINVAL;

	if (cmpxchg(&registered, false, true))
		return -EBUSY;

	mask_serror = mask;
	/*
	 * Paired with the CB + isb() in __pkvm_unmask_serror(). Makes sure a
	 * reader can't unmask serrors before being able to mask them.
	 */
	smp_wmb();
	unmask_serror = unmask;

	return 0;
}

void __hyp_enter(void)
{
	trace_hyp_enter();
	__pkvm_unmask_serror();
}

void __hyp_exit(void)
{
	__pkvm_mask_serror();
	trace_hyp_exit();
}

static int pkvm_refill_memcache(struct pkvm_hyp_vcpu *hyp_vcpu)
{
	struct kvm_vcpu *host_vcpu = hyp_vcpu->host_vcpu;

	return refill_memcache(&hyp_vcpu->vcpu.arch.stage2_mc,
			       host_vcpu->arch.stage2_mc.nr_pages,
			       &host_vcpu->arch.stage2_mc);
}

typedef void (*hyp_entry_exit_handler_fn)(struct pkvm_hyp_vcpu *);

static void handle_pvm_entry_wfx(struct pkvm_hyp_vcpu *hyp_vcpu)
{
	if (vcpu_get_flag(hyp_vcpu->host_vcpu, INCREMENT_PC)) {
		vcpu_clear_flag(&hyp_vcpu->vcpu, PC_UPDATE_REQ);
		kvm_incr_pc(&hyp_vcpu->vcpu);
	}
}

static void handle_pvm_entry_psci(struct pkvm_hyp_vcpu *hyp_vcpu)
{
	u32 psci_fn = smccc_get_function(&hyp_vcpu->vcpu);
	u64 ret = READ_ONCE(hyp_vcpu->host_vcpu->arch.ctxt.regs.regs[0]);

	switch (psci_fn) {
	case PSCI_0_2_FN_CPU_ON:
	case PSCI_0_2_FN64_CPU_ON:
		/*
		 * Check whether the cpu_on request to the host was successful.
		 * If not, reset the vcpu state from ON_PENDING to OFF.
		 * This could happen if this vcpu attempted to turn on the other
		 * vcpu while the other one is in the process of turning itself
		 * off.
		 */
		if (ret != PSCI_RET_SUCCESS) {
			unsigned long cpu_id = smccc_get_arg1(&hyp_vcpu->vcpu);
			struct pkvm_hyp_vcpu *target_vcpu;
			struct pkvm_hyp_vm *hyp_vm;

			hyp_vm = pkvm_hyp_vcpu_to_hyp_vm(hyp_vcpu);
			target_vcpu = pkvm_mpidr_to_hyp_vcpu(hyp_vm, cpu_id);

			if (target_vcpu && READ_ONCE(target_vcpu->power_state) == PSCI_0_2_AFFINITY_LEVEL_ON_PENDING)
				WRITE_ONCE(target_vcpu->power_state, PSCI_0_2_AFFINITY_LEVEL_OFF);

			ret = PSCI_RET_INTERNAL_FAILURE;
		}

		break;
	default:
		break;
	}

	vcpu_set_reg(&hyp_vcpu->vcpu, 0, ret);
}

static void handle_pvm_entry_hvc64(struct pkvm_hyp_vcpu *hyp_vcpu)
{
	u32 fn = smccc_get_function(&hyp_vcpu->vcpu);

	switch (fn) {
	case ARM_SMCCC_VENDOR_HYP_KVM_MEM_SHARE_FUNC_ID:
		fallthrough;
	case ARM_SMCCC_VENDOR_HYP_KVM_MEM_UNSHARE_FUNC_ID:
		fallthrough;
	case ARM_SMCCC_VENDOR_HYP_KVM_MEM_RELINQUISH_FUNC_ID:
		vcpu_set_reg(&hyp_vcpu->vcpu, 0, SMCCC_RET_SUCCESS);
		break;
	default:
		handle_pvm_entry_psci(hyp_vcpu);
		break;
	}
}

static void handle_pvm_entry_sys64(struct pkvm_hyp_vcpu *hyp_vcpu)
{
	struct kvm_vcpu *host_vcpu = hyp_vcpu->host_vcpu;

	/* Exceptions have priority on anything else */
	if (vcpu_get_flag(host_vcpu, PENDING_EXCEPTION)) {
		/* Exceptions caused by this should be undef exceptions. */
		u32 esr = (ESR_ELx_EC_UNKNOWN << ESR_ELx_EC_SHIFT);

		__vcpu_sys_reg(&hyp_vcpu->vcpu, ESR_EL1) = esr;
		kvm_pend_exception(&hyp_vcpu->vcpu, EXCEPT_AA64_EL1_SYNC);
		return;
	}

	if (vcpu_get_flag(host_vcpu, INCREMENT_PC)) {
		vcpu_clear_flag(&hyp_vcpu->vcpu, PC_UPDATE_REQ);
		kvm_incr_pc(&hyp_vcpu->vcpu);
	}

	if (!esr_sys64_to_params(hyp_vcpu->vcpu.arch.fault.esr_el2).is_write) {
		/* r0 as transfer register between the guest and the host. */
		u64 rt_val = READ_ONCE(host_vcpu->arch.ctxt.regs.regs[0]);
		int rt = kvm_vcpu_sys_get_rt(&hyp_vcpu->vcpu);

		vcpu_set_reg(&hyp_vcpu->vcpu, rt, rt_val);
	}
}

static void handle_pvm_entry_iabt(struct pkvm_hyp_vcpu *hyp_vcpu)
{
	unsigned long cpsr = *vcpu_cpsr(&hyp_vcpu->vcpu);
	u32 esr = ESR_ELx_IL;

	if (!vcpu_get_flag(hyp_vcpu->host_vcpu, PENDING_EXCEPTION))
		return;

	/*
	 * If the host wants to inject an exception, get syndrom and
	 * fault address.
	 */
	if ((cpsr & PSR_MODE_MASK) == PSR_MODE_EL0t)
		esr |= (ESR_ELx_EC_IABT_LOW << ESR_ELx_EC_SHIFT);
	else
		esr |= (ESR_ELx_EC_IABT_CUR << ESR_ELx_EC_SHIFT);

	esr |= ESR_ELx_FSC_EXTABT;

	__vcpu_sys_reg(&hyp_vcpu->vcpu, ESR_EL1) = esr;
	__vcpu_sys_reg(&hyp_vcpu->vcpu, FAR_EL1) =
		kvm_vcpu_get_hfar(&hyp_vcpu->vcpu);

	/* Tell the run loop that we want to inject something */
	kvm_pend_exception(&hyp_vcpu->vcpu, EXCEPT_AA64_EL1_SYNC);
}

static void handle_pvm_entry_dabt(struct pkvm_hyp_vcpu *hyp_vcpu)
{
	struct kvm_vcpu *host_vcpu = hyp_vcpu->host_vcpu;
	bool pc_update;

	/* Exceptions have priority over anything else */
	if (vcpu_get_flag(host_vcpu, PENDING_EXCEPTION)) {
		unsigned long cpsr = *vcpu_cpsr(&hyp_vcpu->vcpu);
		u32 esr = ESR_ELx_IL;

		if ((cpsr & PSR_MODE_MASK) == PSR_MODE_EL0t)
			esr |= (ESR_ELx_EC_DABT_LOW << ESR_ELx_EC_SHIFT);
		else
			esr |= (ESR_ELx_EC_DABT_CUR << ESR_ELx_EC_SHIFT);

		esr |= ESR_ELx_FSC_EXTABT;

		__vcpu_sys_reg(&hyp_vcpu->vcpu, ESR_EL1) = esr;
		__vcpu_sys_reg(&hyp_vcpu->vcpu, FAR_EL1) =
			kvm_vcpu_get_hfar(&hyp_vcpu->vcpu);

		/* Tell the run loop that we want to inject something */
		kvm_pend_exception(&hyp_vcpu->vcpu, EXCEPT_AA64_EL1_SYNC);

		/* Cancel potential in-flight MMIO */
		hyp_vcpu->vcpu.mmio_needed = false;
		return;
	}

	/* Handle PC increment on MMIO */
	pc_update = (hyp_vcpu->vcpu.mmio_needed &&
		     vcpu_get_flag(host_vcpu, INCREMENT_PC));
	if (pc_update) {
		vcpu_clear_flag(&hyp_vcpu->vcpu, PC_UPDATE_REQ);
		kvm_incr_pc(&hyp_vcpu->vcpu);
	}

	/* If we were doing an MMIO read access, update the register*/
	if (pc_update && !kvm_vcpu_dabt_iswrite(&hyp_vcpu->vcpu)) {
		/* r0 as transfer register between the guest and the host. */
		u64 rd_val = READ_ONCE(host_vcpu->arch.ctxt.regs.regs[0]);
		int rd = kvm_vcpu_dabt_get_rd(&hyp_vcpu->vcpu);

		vcpu_set_reg(&hyp_vcpu->vcpu, rd, rd_val);
	}

	hyp_vcpu->vcpu.mmio_needed = false;
}

static void handle_pvm_exit_wfx(struct pkvm_hyp_vcpu *hyp_vcpu)
{
	WRITE_ONCE(hyp_vcpu->host_vcpu->arch.ctxt.regs.pstate,
		   hyp_vcpu->vcpu.arch.ctxt.regs.pstate & PSR_MODE_MASK);
	WRITE_ONCE(hyp_vcpu->host_vcpu->arch.fault.esr_el2,
		   hyp_vcpu->vcpu.arch.fault.esr_el2);
}

static void handle_pvm_exit_sys64(struct pkvm_hyp_vcpu *hyp_vcpu)
{
	struct kvm_vcpu *host_vcpu = hyp_vcpu->host_vcpu;
	u32 esr_el2 = hyp_vcpu->vcpu.arch.fault.esr_el2;

	/* r0 as transfer register between the guest and the host. */
	WRITE_ONCE(host_vcpu->arch.fault.esr_el2,
		   esr_el2 & ~ESR_ELx_SYS64_ISS_RT_MASK);

	/* The mode is required for the host to emulate some sysregs */
	WRITE_ONCE(host_vcpu->arch.ctxt.regs.pstate,
		   hyp_vcpu->vcpu.arch.ctxt.regs.pstate & PSR_MODE_MASK);

	if (esr_sys64_to_params(esr_el2).is_write) {
		int rt = kvm_vcpu_sys_get_rt(&hyp_vcpu->vcpu);
		u64 rt_val = vcpu_get_reg(&hyp_vcpu->vcpu, rt);

		WRITE_ONCE(host_vcpu->arch.ctxt.regs.regs[0], rt_val);
	}
}

static void handle_pvm_exit_hvc64(struct pkvm_hyp_vcpu *hyp_vcpu)
{
	struct kvm_vcpu *host_vcpu = hyp_vcpu->host_vcpu;
	int n, i;

	switch (smccc_get_function(&hyp_vcpu->vcpu)) {
	/*
	 * CPU_ON takes 3 arguments, however, to wake up the target vcpu the
	 * host only needs to know the target's cpu_id, which is passed as the
	 * first argument. The processing of the reset state is done at hyp.
	 */
	case PSCI_0_2_FN_CPU_ON:
	case PSCI_0_2_FN64_CPU_ON:
		n = 2;
		break;

	case PSCI_0_2_FN_CPU_OFF:
	case PSCI_0_2_FN_SYSTEM_OFF:
	case PSCI_0_2_FN_SYSTEM_RESET:
	case PSCI_0_2_FN_CPU_SUSPEND:
	case PSCI_0_2_FN64_CPU_SUSPEND:
		n = 1;
		break;

	case ARM_SMCCC_VENDOR_HYP_KVM_MEM_RELINQUISH_FUNC_ID:
		n = 4;
		break;

	case PSCI_1_1_FN_SYSTEM_RESET2:
	case PSCI_1_1_FN64_SYSTEM_RESET2:
		n = 3;
		break;

	/*
	 * The rest are either blocked or handled by HYP, so we should
	 * really never be here.
	 */
	default:
		BUG();
	}

	WRITE_ONCE(host_vcpu->arch.fault.esr_el2,
		   hyp_vcpu->vcpu.arch.fault.esr_el2);

	/* Pass the hvc function id (r0) as well as any potential arguments. */
	for (i = 0; i < n; i++) {
		WRITE_ONCE(host_vcpu->arch.ctxt.regs.regs[i],
			   vcpu_get_reg(&hyp_vcpu->vcpu, i));
	}
}

static void handle_pvm_exit_iabt(struct pkvm_hyp_vcpu *hyp_vcpu)
{
	WRITE_ONCE(hyp_vcpu->host_vcpu->arch.fault.esr_el2,
		   hyp_vcpu->vcpu.arch.fault.esr_el2);
	WRITE_ONCE(hyp_vcpu->host_vcpu->arch.fault.hpfar_el2,
		   hyp_vcpu->vcpu.arch.fault.hpfar_el2);
}

static void handle_pvm_exit_dabt(struct pkvm_hyp_vcpu *hyp_vcpu)
{
	struct kvm_vcpu *host_vcpu = hyp_vcpu->host_vcpu;

	hyp_vcpu->vcpu.mmio_needed = __pkvm_check_ioguard_page(hyp_vcpu);

	if (hyp_vcpu->vcpu.mmio_needed) {
		/* r0 as transfer register between the guest and the host. */
		WRITE_ONCE(host_vcpu->arch.fault.esr_el2,
			   hyp_vcpu->vcpu.arch.fault.esr_el2 & ~ESR_ELx_SRT_MASK);

		if (kvm_vcpu_dabt_iswrite(&hyp_vcpu->vcpu)) {
			int rt = kvm_vcpu_dabt_get_rd(&hyp_vcpu->vcpu);
			u64 rt_val = vcpu_get_reg(&hyp_vcpu->vcpu, rt);

			WRITE_ONCE(host_vcpu->arch.ctxt.regs.regs[0], rt_val);
		}
	} else {
		WRITE_ONCE(host_vcpu->arch.fault.esr_el2,
			   hyp_vcpu->vcpu.arch.fault.esr_el2 & ~ESR_ELx_ISV);
	}

	WRITE_ONCE(host_vcpu->arch.ctxt.regs.pstate,
		   hyp_vcpu->vcpu.arch.ctxt.regs.pstate & PSR_MODE_MASK);
	WRITE_ONCE(host_vcpu->arch.fault.far_el2,
		   hyp_vcpu->vcpu.arch.fault.far_el2 & GENMASK(11, 0));
	WRITE_ONCE(host_vcpu->arch.fault.hpfar_el2,
		   hyp_vcpu->vcpu.arch.fault.hpfar_el2);
	WRITE_ONCE(__vcpu_sys_reg(host_vcpu, SCTLR_EL1),
		   __vcpu_sys_reg(&hyp_vcpu->vcpu, SCTLR_EL1) &
			(SCTLR_ELx_EE | SCTLR_EL1_E0E));
}

static void handle_vm_entry_generic(struct pkvm_hyp_vcpu *hyp_vcpu)
{
	vcpu_copy_flag(&hyp_vcpu->vcpu, hyp_vcpu->host_vcpu, PC_UPDATE_REQ);
}

static void handle_vm_exit_generic(struct pkvm_hyp_vcpu *hyp_vcpu)
{
	WRITE_ONCE(hyp_vcpu->host_vcpu->arch.fault.esr_el2,
		   hyp_vcpu->vcpu.arch.fault.esr_el2);
}

static void handle_vm_exit_abt(struct pkvm_hyp_vcpu *hyp_vcpu)
{
	struct kvm_vcpu *host_vcpu = hyp_vcpu->host_vcpu;

	WRITE_ONCE(host_vcpu->arch.fault.esr_el2,
		   hyp_vcpu->vcpu.arch.fault.esr_el2);
	WRITE_ONCE(host_vcpu->arch.fault.far_el2,
		   hyp_vcpu->vcpu.arch.fault.far_el2);
	WRITE_ONCE(host_vcpu->arch.fault.hpfar_el2,
		   hyp_vcpu->vcpu.arch.fault.hpfar_el2);
	WRITE_ONCE(host_vcpu->arch.fault.disr_el1,
		   hyp_vcpu->vcpu.arch.fault.disr_el1);
}

static const hyp_entry_exit_handler_fn entry_hyp_pvm_handlers[] = {
	[0 ... ESR_ELx_EC_MAX]		= NULL,
	[ESR_ELx_EC_WFx]		= handle_pvm_entry_wfx,
	[ESR_ELx_EC_HVC64]		= handle_pvm_entry_hvc64,
	[ESR_ELx_EC_SYS64]		= handle_pvm_entry_sys64,
	[ESR_ELx_EC_IABT_LOW]		= handle_pvm_entry_iabt,
	[ESR_ELx_EC_DABT_LOW]		= handle_pvm_entry_dabt,
};

static const hyp_entry_exit_handler_fn exit_hyp_pvm_handlers[] = {
	[0 ... ESR_ELx_EC_MAX]		= NULL,
	[ESR_ELx_EC_WFx]		= handle_pvm_exit_wfx,
	[ESR_ELx_EC_HVC64]		= handle_pvm_exit_hvc64,
	[ESR_ELx_EC_SYS64]		= handle_pvm_exit_sys64,
	[ESR_ELx_EC_IABT_LOW]		= handle_pvm_exit_iabt,
	[ESR_ELx_EC_DABT_LOW]		= handle_pvm_exit_dabt,
};

static const hyp_entry_exit_handler_fn entry_hyp_vm_handlers[] = {
	[0 ... ESR_ELx_EC_MAX]		= handle_vm_entry_generic,
};

static const hyp_entry_exit_handler_fn exit_hyp_vm_handlers[] = {
	[0 ... ESR_ELx_EC_MAX]		= handle_vm_exit_generic,
	[ESR_ELx_EC_IABT_LOW]		= handle_vm_exit_abt,
	[ESR_ELx_EC_DABT_LOW]		= handle_vm_exit_abt,
};

static void __hyp_sve_save_guest(struct kvm_vcpu *vcpu)
{
	__vcpu_sys_reg(vcpu, ZCR_EL1) = read_sysreg_el1(SYS_ZCR);
	/*
	 * On saving/restoring guest sve state, always use the maximum VL for
	 * the guest. The layout of the data when saving the sve state depends
	 * on the VL, so use a consistent (i.e., the maximum) guest VL.
	 */
	sve_cond_update_zcr_vq(vcpu_sve_max_vq(vcpu) - 1, SYS_ZCR_EL2);
	__sve_save_state(vcpu_sve_pffr(vcpu), &vcpu->arch.ctxt.fp_regs.fpsr, true);
	write_sysreg_s(sve_vq_from_vl(kvm_host_sve_max_vl) - 1, SYS_ZCR_EL2);
}

static void __hyp_sve_restore_host(void)
{
	struct cpu_sve_state *sve_state = *host_data_ptr(sve_state);

	/*
	 * On saving/restoring host sve state, always use the maximum VL for
	 * the host. The layout of the data when saving the sve state depends
	 * on the VL, so use a consistent (i.e., the maximum) host VL.
	 *
	 * Note that this constrains the PE to the maximum shared VL
	 * that was discovered, if we wish to use larger VLs this will
	 * need to be revisited.
	 */
	write_sysreg_s(sve_vq_from_vl(kvm_host_sve_max_vl) - 1, SYS_ZCR_EL2);
	__sve_restore_state(sve_state->sve_regs + sve_ffr_offset(kvm_host_sve_max_vl),
			    &sve_state->fpsr,
			    true);
	write_sysreg_el1(sve_state->zcr_el1, SYS_ZCR);
}

static void fpsimd_sve_flush(void)
{
	*host_data_ptr(fp_owner) = FP_STATE_HOST_OWNED;
}

static void fpsimd_sve_sync(struct kvm_vcpu *vcpu)
{
	bool has_fpmr;

	if (!guest_owns_fp_regs())
		return;

	cpacr_clear_set(0, CPACR_ELx_FPEN | CPACR_ELx_ZEN);
	isb();

	if (vcpu_has_sve(vcpu))
		__hyp_sve_save_guest(vcpu);
	else
		__fpsimd_save_state(&vcpu->arch.ctxt.fp_regs);

	has_fpmr = kvm_has_fpmr(kern_hyp_va(vcpu->kvm));
	if (has_fpmr)
		__vcpu_sys_reg(vcpu, FPMR) = read_sysreg_s(SYS_FPMR);

	if (system_supports_sve())
		__hyp_sve_restore_host();
	else
		__fpsimd_restore_state(host_data_ptr(host_ctxt.fp_regs));

	if (has_fpmr)
		write_sysreg_s(*host_data_ptr(fpmr), SYS_FPMR);

	*host_data_ptr(fp_owner) = FP_STATE_HOST_OWNED;
}

static void flush_hyp_vgic_state(struct pkvm_hyp_vcpu *hyp_vcpu)
{
	struct kvm_vcpu *host_vcpu = hyp_vcpu->host_vcpu;
	struct vgic_v3_cpu_if *host_cpu_if, *hyp_cpu_if;
	unsigned int used_lrs, max_lrs, i;

	host_cpu_if	= &host_vcpu->arch.vgic_cpu.vgic_v3;
	hyp_cpu_if	= &hyp_vcpu->vcpu.arch.vgic_cpu.vgic_v3;

	max_lrs		= (read_gicreg(ICH_VTR_EL2) & 0xf) + 1;
	used_lrs	= READ_ONCE(host_cpu_if->used_lrs);
	used_lrs	= min(used_lrs, max_lrs);

	hyp_cpu_if->vgic_hcr	= READ_ONCE(host_cpu_if->vgic_hcr);
	/* Should be a one-off */
	hyp_cpu_if->vgic_sre	= (ICC_SRE_EL1_DIB |
				   ICC_SRE_EL1_DFB |
				   ICC_SRE_EL1_SRE);
	hyp_cpu_if->used_lrs	= used_lrs;

	for (i = 0; i < used_lrs; i++)
		hyp_cpu_if->vgic_lr[i] = READ_ONCE(host_cpu_if->vgic_lr[i]);
}

static void sync_hyp_vgic_state(struct pkvm_hyp_vcpu *hyp_vcpu)
{
	struct kvm_vcpu *host_vcpu = hyp_vcpu->host_vcpu;
	struct vgic_v3_cpu_if *host_cpu_if, *hyp_cpu_if;
	unsigned int i;

	host_cpu_if	= &host_vcpu->arch.vgic_cpu.vgic_v3;
	hyp_cpu_if	= &hyp_vcpu->vcpu.arch.vgic_cpu.vgic_v3;

	WRITE_ONCE(host_cpu_if->vgic_hcr, hyp_cpu_if->vgic_hcr);

	for (i = 0; i < hyp_cpu_if->used_lrs; i++)
		WRITE_ONCE(host_cpu_if->vgic_lr[i], hyp_cpu_if->vgic_lr[i]);
}

static void flush_hyp_timer_state(struct pkvm_hyp_vcpu *hyp_vcpu)
{
	if (!pkvm_hyp_vcpu_is_protected(hyp_vcpu))
		return;

	/*
	 * A hyp vcpu has no offset, and sees vtime == ptime. The
	 * ptimer is fully emulated by EL1 and cannot be trusted.
	 */
	write_sysreg(0, cntvoff_el2);
	isb();
	write_sysreg_el0(__vcpu_sys_reg(&hyp_vcpu->vcpu, CNTV_CVAL_EL0),
			 SYS_CNTV_CVAL);
	write_sysreg_el0(__vcpu_sys_reg(&hyp_vcpu->vcpu, CNTV_CTL_EL0),
			 SYS_CNTV_CTL);
}

static void sync_hyp_timer_state(struct pkvm_hyp_vcpu *hyp_vcpu)
{
	if (!pkvm_hyp_vcpu_is_protected(hyp_vcpu))
		return;

	/*
	 * Preserve the vtimer state so that it is always correct,
	 * even if the host tries to make a mess.
	 */
	__vcpu_sys_reg(&hyp_vcpu->vcpu, CNTV_CVAL_EL0) =
		read_sysreg_el0(SYS_CNTV_CVAL);
	__vcpu_sys_reg(&hyp_vcpu->vcpu, CNTV_CTL_EL0) =
		read_sysreg_el0(SYS_CNTV_CTL);
}

#define copy_sysreg(REG) do {							\
	BUILD_BUG_ON(REG <= __INVALID_SYSREG__);				\
	BUILD_BUG_ON(REG >= NR_SYS_REGS);					\
	to_vcpu->arch.ctxt.sys_regs[REG] = from_vcpu->arch.ctxt.sys_regs[REG];	\
} while (0)

static void __copy_vcpu_state(const struct kvm_vcpu *from_vcpu,
			      struct kvm_vcpu *to_vcpu)
{
	int reg;

	to_vcpu->arch.ctxt.regs		= from_vcpu->arch.ctxt.regs;
	to_vcpu->arch.ctxt.spsr_abt	= from_vcpu->arch.ctxt.spsr_abt;
	to_vcpu->arch.ctxt.spsr_und	= from_vcpu->arch.ctxt.spsr_und;
	to_vcpu->arch.ctxt.spsr_irq	= from_vcpu->arch.ctxt.spsr_irq;
	to_vcpu->arch.ctxt.spsr_fiq	= from_vcpu->arch.ctxt.spsr_fiq;

	/*
	 * Copy the sysregs, but don't mess with the timer state which
	 * is directly handled by EL1 and is expected to be preserved.
	 * Note that the sysreg enum is sparse and not sorted, therefore,
	 * explicitly specify the registers to copy.
	 */
	copy_sysreg(MPIDR_EL1);
	copy_sysreg(CLIDR_EL1);
	copy_sysreg(CSSELR_EL1);
	copy_sysreg(TPIDR_EL0);
	copy_sysreg(TPIDRRO_EL0);
	copy_sysreg(TPIDR_EL1);
	copy_sysreg(CNTKCTL_EL1);
	copy_sysreg(PAR_EL1);
	copy_sysreg(MDCCINT_EL1);
	copy_sysreg(OSLSR_EL1);
	copy_sysreg(DISR_EL1);

	copy_sysreg(PMCR_EL0);
	copy_sysreg(PMSELR_EL0);
	for (reg = PMEVCNTR0_EL0; reg <= PMEVCNTR30_EL0; reg++)
		copy_sysreg(reg);
	copy_sysreg(PMCCNTR_EL0);
	for (reg = PMEVTYPER0_EL0; reg <= PMEVTYPER30_EL0; reg++)
		copy_sysreg(reg);
	copy_sysreg(PMCCFILTR_EL0);
	copy_sysreg(PMCNTENSET_EL0);
	copy_sysreg(PMINTENSET_EL1);
	copy_sysreg(PMOVSSET_EL0);
	copy_sysreg(PMUSERENR_EL0);

	copy_sysreg(APIAKEYLO_EL1);
	copy_sysreg(APIAKEYHI_EL1);
	copy_sysreg(APIBKEYLO_EL1);
	copy_sysreg(APIBKEYHI_EL1);
	copy_sysreg(APDAKEYLO_EL1);
	copy_sysreg(APDAKEYHI_EL1);
	copy_sysreg(APDBKEYLO_EL1);
	copy_sysreg(APDBKEYHI_EL1);
	copy_sysreg(APGAKEYLO_EL1);
	copy_sysreg(APGAKEYHI_EL1);

	copy_sysreg(RGSR_EL1);
	copy_sysreg(GCR_EL1);
	copy_sysreg(TFSRE0_EL1);

	copy_sysreg(SCTLR_EL1);
	copy_sysreg(ACTLR_EL1);
	copy_sysreg(CPACR_EL1);
	copy_sysreg(ZCR_EL1);
	copy_sysreg(TTBR0_EL1);
	copy_sysreg(TTBR1_EL1);
	copy_sysreg(TCR_EL1);
	copy_sysreg(TCR2_EL1);
	copy_sysreg(ESR_EL1);
	copy_sysreg(AFSR0_EL1);
	copy_sysreg(AFSR1_EL1);
	copy_sysreg(FAR_EL1);
	copy_sysreg(MAIR_EL1);
	copy_sysreg(VBAR_EL1);
	copy_sysreg(CONTEXTIDR_EL1);
	copy_sysreg(AMAIR_EL1);
	copy_sysreg(MDSCR_EL1);
	copy_sysreg(ELR_EL1);
	copy_sysreg(SP_EL1);
	copy_sysreg(SPSR_EL1);
	copy_sysreg(TFSR_EL1);

	copy_sysreg(PIR_EL1);
	copy_sysreg(PIRE0_EL1);
}

static void __sync_hyp_vcpu(struct pkvm_hyp_vcpu *hyp_vcpu)
{
	__copy_vcpu_state(&hyp_vcpu->vcpu, hyp_vcpu->host_vcpu);
}

static void __flush_hyp_vcpu(struct pkvm_hyp_vcpu *hyp_vcpu)
{
	__copy_vcpu_state(hyp_vcpu->host_vcpu, &hyp_vcpu->vcpu);
}

static void flush_debug_state(struct pkvm_hyp_vcpu *hyp_vcpu)
{
	struct kvm_vcpu *vcpu = &hyp_vcpu->vcpu;
	struct kvm_vcpu *host_vcpu = hyp_vcpu->host_vcpu;
	u64 mdcr_el2 = READ_ONCE(host_vcpu->arch.mdcr_el2);

	/*
	 * Propagate the monitor debug configuration of the vcpu from host.
	 * Preserve HPMN, which is set-up by some knowledgeable bootcode.
	 * Ensure that MDCR_EL2_E2PB_MASK and MDCR_EL2_E2TB_MASK are clear,
	 * as guests should not be able to access profiling and trace buffers.
	 * Ensure that RES0 bits are clear.
	 */
	mdcr_el2 &= ~(MDCR_EL2_RES0 |
		      MDCR_EL2_HPMN_MASK |
		      (MDCR_EL2_E2PB_MASK << MDCR_EL2_E2PB_SHIFT) |
		      (MDCR_EL2_E2TB_MASK << MDCR_EL2_E2TB_SHIFT));
	vcpu->arch.mdcr_el2 = read_sysreg(mdcr_el2) & MDCR_EL2_HPMN_MASK;
	vcpu->arch.mdcr_el2 |= mdcr_el2;

	vcpu->arch.pmu = host_vcpu->arch.pmu;
	vcpu->guest_debug = READ_ONCE(host_vcpu->guest_debug);

	if (!kvm_vcpu_needs_debug_regs(vcpu))
		return;

	__vcpu_save_guest_debug_regs(vcpu);

	/* Switch debug_ptr to the external_debug_state if done by the host. */
	if (kern_hyp_va(READ_ONCE(host_vcpu->arch.debug_ptr)) ==
	    &host_vcpu->arch.external_debug_state)
		vcpu->arch.debug_ptr = &host_vcpu->arch.external_debug_state;

	/* Propagate any special handling for single step from host. */
	vcpu_write_sys_reg(vcpu, vcpu_read_sys_reg(host_vcpu, MDSCR_EL1),
						   MDSCR_EL1);
	*vcpu_cpsr(vcpu) = *vcpu_cpsr(host_vcpu);
}

static void sync_debug_state(struct pkvm_hyp_vcpu *hyp_vcpu)
{
	struct kvm_vcpu *vcpu = &hyp_vcpu->vcpu;
	struct kvm_vcpu *host_vcpu = hyp_vcpu->host_vcpu;

	if (!kvm_vcpu_needs_debug_regs(vcpu))
		return;

	__vcpu_restore_guest_debug_regs(vcpu);
	vcpu_write_sys_reg(host_vcpu, vcpu_read_sys_reg(vcpu, MDSCR_EL1),
						   MDSCR_EL1);
	*vcpu_cpsr(host_vcpu) = *vcpu_cpsr(vcpu);

	vcpu->arch.debug_ptr = &host_vcpu->arch.vcpu_debug_state;
}

static void __flush_hyp_reqs(struct pkvm_hyp_vcpu *hyp_vcpu)
{
	struct kvm_hyp_req *hyp_req = hyp_vcpu->vcpu.arch.hyp_reqs;

	hyp_req->type = KVM_HYP_LAST_REQ;

	/* One of the request might have been TYPE_MEM/DEST_VCPU_MEMCACHE */
	pkvm_refill_memcache(hyp_vcpu);
}

static void flush_hyp_vcpu(struct pkvm_hyp_vcpu *hyp_vcpu)
{
	struct kvm_vcpu *host_vcpu = hyp_vcpu->host_vcpu;
	hyp_entry_exit_handler_fn ec_handler;
	u8 esr_ec;

	fpsimd_sve_flush();

	/*
	 * If we deal with a non-protected guest and the state is potentially
	 * dirty (from a host perspective), copy the state back into the hyp
	 * vcpu.
	 */
	if (!pkvm_hyp_vcpu_is_protected(hyp_vcpu)) {
		if (vcpu_get_flag(host_vcpu, PKVM_HOST_STATE_DIRTY))
			__flush_hyp_vcpu(hyp_vcpu);

		hyp_vcpu->vcpu.arch.iflags = READ_ONCE(host_vcpu->arch.iflags);
		flush_debug_state(hyp_vcpu);

		hyp_vcpu->vcpu.arch.hcr_el2 &= ~(HCR_TWI | HCR_TWE);
		hyp_vcpu->vcpu.arch.hcr_el2 |= READ_ONCE(host_vcpu->arch.hcr_el2) &
							 (HCR_TWI | HCR_TWE);
	}

	hyp_vcpu->vcpu.arch.vsesr_el2 = host_vcpu->arch.vsesr_el2;

	flush_hyp_vgic_state(hyp_vcpu);
	flush_hyp_timer_state(hyp_vcpu);

	switch (ARM_EXCEPTION_CODE(hyp_vcpu->exit_code)) {
	case ARM_EXCEPTION_IRQ:
	case ARM_EXCEPTION_EL1_SERROR:
	case ARM_EXCEPTION_IL:
		break;
	case ARM_EXCEPTION_TRAP:
		esr_ec = ESR_ELx_EC(kvm_vcpu_get_esr(&hyp_vcpu->vcpu));

		if (pkvm_hyp_vcpu_is_protected(hyp_vcpu))
			ec_handler = entry_hyp_pvm_handlers[esr_ec];
		else
			ec_handler = entry_hyp_vm_handlers[esr_ec];

		if (ec_handler)
			ec_handler(hyp_vcpu);
		break;
	case ARM_EXCEPTION_HYP_REQ:
		__flush_hyp_reqs(hyp_vcpu);
		break;
	default:
		BUG();
	}

	hyp_vcpu->exit_code = 0;
}

static void sync_hyp_vcpu(struct pkvm_hyp_vcpu *hyp_vcpu, u64 *exit_code)
{
	struct kvm_vcpu *host_vcpu = hyp_vcpu->host_vcpu;
	hyp_entry_exit_handler_fn ec_handler;
	u8 esr_ec;

	fpsimd_sve_sync(&hyp_vcpu->vcpu);

	if (!pkvm_hyp_vcpu_is_protected(hyp_vcpu))
		sync_debug_state(hyp_vcpu);

	/*
	 * Don't sync the vcpu GPR/sysreg state after a run. Instead,
	 * leave it in the hyp vCPU until someone actually requires it.
	 */
	sync_hyp_vgic_state(hyp_vcpu);
	sync_hyp_timer_state(hyp_vcpu);

	switch (ARM_EXCEPTION_CODE(*exit_code)) {
	case ARM_EXCEPTION_IRQ:
	case ARM_EXCEPTION_HYP_REQ:
		break;
	case ARM_EXCEPTION_TRAP:
		esr_ec = ESR_ELx_EC(kvm_vcpu_get_esr(&hyp_vcpu->vcpu));

		if (pkvm_hyp_vcpu_is_protected(hyp_vcpu))
			ec_handler = exit_hyp_pvm_handlers[esr_ec];
		else
			ec_handler = exit_hyp_vm_handlers[esr_ec];

		if (ec_handler) {
			ec_handler(hyp_vcpu);
		} else {
			/*
			 * If we have no handler we should not be punting this
			 * trap to Host, as it will have no sync'ed context to
			 * handle (for example: ESR_EL2).
			 */
			vcpu_illegal_trap(&hyp_vcpu->vcpu, exit_code);
		}
		break;
	case ARM_EXCEPTION_EL1_SERROR:
	case ARM_EXCEPTION_IL:
		break;
	default:
		BUG();
	}

	if (pkvm_hyp_vcpu_is_protected(hyp_vcpu))
		vcpu_clear_flag(host_vcpu, PC_UPDATE_REQ);
	else
		host_vcpu->arch.iflags = hyp_vcpu->vcpu.arch.iflags;

	hyp_vcpu->exit_code = *exit_code;
}

static void handle___pkvm_vcpu_load(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(pkvm_handle_t, handle, host_ctxt, 1);
	DECLARE_REG(unsigned int, vcpu_idx, host_ctxt, 2);
	DECLARE_REG(u64, hcr_el2, host_ctxt, 3);
	struct pkvm_hyp_vcpu *hyp_vcpu;
	int __percpu *last_vcpu_ran;
	int *last_ran;

	if (!is_protected_kvm_enabled())
		return;

	hyp_vcpu = pkvm_load_hyp_vcpu(handle, vcpu_idx);
	if (!hyp_vcpu)
		return;

	/*
	 * Guarantee that both TLBs and I-cache are private to each vcpu. If a
	 * vcpu from the same VM has previously run on the same physical CPU,
	 * nuke the relevant contexts.
	 */
	last_vcpu_ran = hyp_vcpu->vcpu.arch.hw_mmu->last_vcpu_ran;
	last_ran = (__force int *) &last_vcpu_ran[hyp_smp_processor_id()];
	if (*last_ran != hyp_vcpu->vcpu.vcpu_id) {
		__kvm_flush_cpu_context(hyp_vcpu->vcpu.arch.hw_mmu);
		*last_ran = hyp_vcpu->vcpu.vcpu_id;
	}

	if (pkvm_hyp_vcpu_is_protected(hyp_vcpu)) {
		/* Propagate WFx trapping flags */
		hyp_vcpu->vcpu.arch.hcr_el2 &= ~(HCR_TWE | HCR_TWI);
		hyp_vcpu->vcpu.arch.hcr_el2 |= hcr_el2 & (HCR_TWE | HCR_TWI);
	}
}

static void handle___pkvm_vcpu_put(struct kvm_cpu_context *host_ctxt)
{
	struct pkvm_hyp_vcpu *hyp_vcpu;

	if (!is_protected_kvm_enabled())
		return;

	hyp_vcpu = pkvm_get_loaded_hyp_vcpu();
	if (hyp_vcpu) {
		struct kvm_vcpu *host_vcpu = hyp_vcpu->host_vcpu;

		if (!pkvm_hyp_vcpu_is_protected(hyp_vcpu) &&
		    !vcpu_get_flag(host_vcpu, PKVM_HOST_STATE_DIRTY)) {
			__sync_hyp_vcpu(hyp_vcpu);
		}

		pkvm_put_hyp_vcpu(hyp_vcpu);
	}
}

static void handle___pkvm_vcpu_sync_state(struct kvm_cpu_context *host_ctxt)
{
	struct pkvm_hyp_vcpu *hyp_vcpu;

	if (!is_protected_kvm_enabled())
		return;

	hyp_vcpu = pkvm_get_loaded_hyp_vcpu();
	if (!hyp_vcpu || pkvm_hyp_vcpu_is_protected(hyp_vcpu))
		return;

	__sync_hyp_vcpu(hyp_vcpu);
}

static struct kvm_vcpu *__get_host_hyp_vcpus(struct kvm_vcpu *arg,
					     struct pkvm_hyp_vcpu **hyp_vcpup)
{
	struct kvm_vcpu *host_vcpu = kern_hyp_va(arg);
	struct pkvm_hyp_vcpu *hyp_vcpu = NULL;

	if (unlikely(is_protected_kvm_enabled())) {
		hyp_vcpu = pkvm_get_loaded_hyp_vcpu();

		if (!hyp_vcpu || hyp_vcpu->host_vcpu != host_vcpu) {
			hyp_vcpu = NULL;
			host_vcpu = NULL;
		}
	}

	*hyp_vcpup = hyp_vcpu;
	return host_vcpu;
}

#define get_host_hyp_vcpus(ctxt, regnr, hyp_vcpup)			\
	({								\
		DECLARE_REG(struct kvm_vcpu *, __vcpu, ctxt, regnr);	\
		__get_host_hyp_vcpus(__vcpu, hyp_vcpup);		\
	})

#define get_host_hyp_vcpus_from_vgic_v3_cpu_if(ctxt, regnr, hyp_vcpup)		\
	({									\
		DECLARE_REG(struct vgic_v3_cpu_if *, cif, ctxt, regnr); 	\
		struct kvm_vcpu *__vcpu = container_of(cif,			\
						       struct kvm_vcpu,		\
						       arch.vgic_cpu.vgic_v3);	\
										\
		__get_host_hyp_vcpus(__vcpu, hyp_vcpup);			\
	})

static void handle___kvm_vcpu_run(struct kvm_cpu_context *host_ctxt)
{
	struct pkvm_hyp_vcpu *hyp_vcpu;
	struct kvm_vcpu *host_vcpu;
	u64 ret = ARM_EXCEPTION_IL;

	host_vcpu = get_host_hyp_vcpus(host_ctxt, 1, &hyp_vcpu);

	if (!host_vcpu)
		goto out;

	if (unlikely(hyp_vcpu)) {
		/*
		 * KVM (and pKVM) doesn't support SME guests for now, and
		 * ensures that SME features aren't enabled in pstate when
		 * loading a vcpu. Therefore, if SME features enabled the host
		 * is misbehaving.
		 */
		if (unlikely(system_supports_sme() && read_sysreg_s(SYS_SVCR)))
			goto out;

		if (hyp_vcpu->power_state == PSCI_0_2_AFFINITY_LEVEL_ON_PENDING)
			pkvm_reset_vcpu(hyp_vcpu);

		if (unlikely(hyp_vcpu->power_state != PSCI_0_2_AFFINITY_LEVEL_ON))
			goto out;

		flush_hyp_vcpu(hyp_vcpu);
		ret = __kvm_vcpu_run(&hyp_vcpu->vcpu);
		sync_hyp_vcpu(hyp_vcpu, &ret);
	} else {
		/* The host is fully trusted, run its vCPU directly. */
		fpsimd_lazy_switch_to_guest(host_vcpu);
		ret = __kvm_vcpu_run(host_vcpu);
		fpsimd_lazy_switch_to_host(host_vcpu);
	}
out:
	cpu_reg(host_ctxt, 1) =  ret;
}

static void handle___pkvm_host_donate_guest(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(u64, pfn, host_ctxt, 1);
	DECLARE_REG(u64, gfn, host_ctxt, 2);
	DECLARE_REG(u64, nr_pages, host_ctxt, 3);
	struct pkvm_hyp_vcpu *hyp_vcpu;
	int ret = -EINVAL;

	if (!is_protected_kvm_enabled())
		goto out;

	hyp_vcpu = pkvm_get_loaded_hyp_vcpu();
	if (!hyp_vcpu || !pkvm_hyp_vcpu_is_protected(hyp_vcpu))
		goto out;

	ret = pkvm_refill_memcache(hyp_vcpu);
	if (ret)
		goto out;

	ret = __pkvm_host_donate_guest(pfn, gfn, hyp_vcpu, nr_pages);
out:
	cpu_reg(host_ctxt, 1) =  ret;
}

static void handle___pkvm_host_donate_guest_sglist(struct kvm_cpu_context *host_ctxt)
{
	struct pkvm_hyp_vcpu *hyp_vcpu;
	int ret = -EINVAL;

	if (!is_protected_kvm_enabled())
		goto out;

	hyp_vcpu = pkvm_get_loaded_hyp_vcpu();
	if (!hyp_vcpu || !pkvm_hyp_vcpu_is_protected(hyp_vcpu))
		goto out;

	ret = pkvm_refill_memcache(hyp_vcpu);
	if (ret)
		goto out;

	ret = __pkvm_host_donate_sglist_guest(hyp_vcpu);

out:
	cpu_reg(host_ctxt, 1) =  ret;
}

static void handle___pkvm_host_share_guest(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(u64, pfn, host_ctxt, 1);
	DECLARE_REG(u64, gfn, host_ctxt, 2);
	DECLARE_REG(enum kvm_pgtable_prot, prot, host_ctxt, 3);
	DECLARE_REG(u64, nr_pages, host_ctxt, 4);
	struct pkvm_hyp_vcpu *hyp_vcpu;
	int ret = -EINVAL;

	if (!is_protected_kvm_enabled())
		goto out;

	hyp_vcpu = pkvm_get_loaded_hyp_vcpu();
	if (!hyp_vcpu || pkvm_hyp_vcpu_is_protected(hyp_vcpu))
		goto out;

	ret = pkvm_refill_memcache(hyp_vcpu);
	if (ret)
		goto out;

	ret = __pkvm_host_share_guest(pfn, gfn, hyp_vcpu, prot, nr_pages);
out:
	cpu_reg(host_ctxt, 1) =  ret;
}

static void handle___pkvm_host_unshare_guest(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(pkvm_handle_t, handle, host_ctxt, 1);
	DECLARE_REG(u64, gfn, host_ctxt, 2);
	DECLARE_REG(u64, nr_pages, host_ctxt, 3);
	struct pkvm_hyp_vm *hyp_vm;
	int ret = -EINVAL;

	if (!is_protected_kvm_enabled())
		goto out;

	hyp_vm = get_np_pkvm_hyp_vm(handle);
	if (!hyp_vm)
		goto out;

	ret = __pkvm_host_unshare_guest(gfn, hyp_vm, nr_pages);
	put_pkvm_hyp_vm(hyp_vm);
out:
	cpu_reg(host_ctxt, 1) =  ret;
}

static void handle___pkvm_host_relax_perms_guest(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(u64, gfn, host_ctxt, 1);
	DECLARE_REG(enum kvm_pgtable_prot, prot, host_ctxt, 2);
	struct pkvm_hyp_vcpu *hyp_vcpu;
	int ret = -EINVAL;

	if (!is_protected_kvm_enabled())
		goto out;

	hyp_vcpu = pkvm_get_loaded_hyp_vcpu();
	if (!hyp_vcpu || pkvm_hyp_vcpu_is_protected(hyp_vcpu))
		goto out;

	ret = __pkvm_host_relax_perms_guest(gfn, hyp_vcpu, prot);
out:
	cpu_reg(host_ctxt, 1) = ret;
}

static void handle___pkvm_host_wrprotect_guest(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(pkvm_handle_t, handle, host_ctxt, 1);
	DECLARE_REG(u64, gfn, host_ctxt, 2);
	DECLARE_REG(u64, size, host_ctxt, 3);
	struct pkvm_hyp_vm *hyp_vm;
	int ret = -EINVAL;

	if (!is_protected_kvm_enabled())
		goto out;

	hyp_vm = get_pkvm_hyp_vm(handle);
	if (!hyp_vm)
		goto out;

	ret = __pkvm_host_wrprotect_guest(gfn, hyp_vm, size);
	put_pkvm_hyp_vm(hyp_vm);
out:
	cpu_reg(host_ctxt, 1) = ret;
}

static void handle___pkvm_host_test_clear_young_guest(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(pkvm_handle_t, handle, host_ctxt, 1);
	DECLARE_REG(u64, gfn, host_ctxt, 2);
	DECLARE_REG(u64, size, host_ctxt, 3);
	DECLARE_REG(bool, mkold, host_ctxt, 4);
	struct pkvm_hyp_vm *hyp_vm;
	int ret = -EINVAL;

	if (!is_protected_kvm_enabled())
		goto out;

	hyp_vm = get_np_pkvm_hyp_vm(handle);
	if (!hyp_vm)
		goto out;

	ret = __pkvm_host_test_clear_young_guest(gfn, size, mkold, hyp_vm);
	put_pkvm_hyp_vm(hyp_vm);
out:
	cpu_reg(host_ctxt, 1) = ret;
}

static void handle___pkvm_host_mkyoung_guest(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(u64, gfn, host_ctxt, 1);
	struct pkvm_hyp_vcpu *hyp_vcpu;
	kvm_pte_t pte = 0;

	if (!is_protected_kvm_enabled())
		goto out;

	hyp_vcpu = pkvm_get_loaded_hyp_vcpu();
	if (!hyp_vcpu || pkvm_hyp_vcpu_is_protected(hyp_vcpu))
		goto out;

	pte = __pkvm_host_mkyoung_guest(gfn, hyp_vcpu);
out:
	cpu_reg(host_ctxt, 1) =  pte;
}

static void handle___pkvm_host_split_guest(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(u64, gfn, host_ctxt, 1);
	DECLARE_REG(u64, size, host_ctxt, 2);
	struct pkvm_hyp_vcpu *hyp_vcpu;
	int ret = -EINVAL;

	if (!is_protected_kvm_enabled())
		goto out;

	hyp_vcpu = pkvm_get_loaded_hyp_vcpu();
	if (!hyp_vcpu)
		goto out;

	if (!pkvm_hyp_vcpu_is_protected(hyp_vcpu))
		goto out;

	ret = pkvm_refill_memcache(hyp_vcpu);
	if (ret)
		goto out;

	ret = __pkvm_host_split_guest(gfn, size, hyp_vcpu);

out:
	cpu_reg(host_ctxt, 1) = ret;
}

static void handle___kvm_adjust_pc(struct kvm_cpu_context *host_ctxt)
{
	struct pkvm_hyp_vcpu *hyp_vcpu;
	struct kvm_vcpu *host_vcpu;

	host_vcpu = get_host_hyp_vcpus(host_ctxt, 1, &hyp_vcpu);
	if (!host_vcpu)
		return;

	if (hyp_vcpu) {
		/* This only applies to non-protected VMs */
		if (pkvm_hyp_vcpu_is_protected(hyp_vcpu))
			return;

		__kvm_adjust_pc(&hyp_vcpu->vcpu);
	} else {
		__kvm_adjust_pc(host_vcpu);
	}
}

static void handle___kvm_flush_vm_context(struct kvm_cpu_context *host_ctxt)
{
	__kvm_flush_vm_context();
}

static void handle___kvm_tlb_flush_vmid_ipa(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(struct kvm_s2_mmu *, mmu, host_ctxt, 1);
	DECLARE_REG(phys_addr_t, ipa, host_ctxt, 2);
	DECLARE_REG(int, level, host_ctxt, 3);

	__kvm_tlb_flush_vmid_ipa(kern_hyp_va(mmu), ipa, level);
}

static void handle___kvm_tlb_flush_vmid_ipa_nsh(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(struct kvm_s2_mmu *, mmu, host_ctxt, 1);
	DECLARE_REG(phys_addr_t, ipa, host_ctxt, 2);
	DECLARE_REG(int, level, host_ctxt, 3);

	__kvm_tlb_flush_vmid_ipa_nsh(kern_hyp_va(mmu), ipa, level);
}

static void
handle___kvm_tlb_flush_vmid_range(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(struct kvm_s2_mmu *, mmu, host_ctxt, 1);
	DECLARE_REG(phys_addr_t, start, host_ctxt, 2);
	DECLARE_REG(unsigned long, pages, host_ctxt, 3);

	__kvm_tlb_flush_vmid_range(kern_hyp_va(mmu), start, pages);
}

static void handle___kvm_tlb_flush_vmid(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(struct kvm_s2_mmu *, mmu, host_ctxt, 1);

	__kvm_tlb_flush_vmid(kern_hyp_va(mmu));
}

static void handle___pkvm_tlb_flush_vmid(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(pkvm_handle_t, handle, host_ctxt, 1);
	struct pkvm_hyp_vm *hyp_vm;

	if (!is_protected_kvm_enabled())
		return;

	hyp_vm = get_pkvm_hyp_vm(handle);
	if (!hyp_vm)
		return;

	__kvm_tlb_flush_vmid(&hyp_vm->kvm.arch.mmu);
	put_pkvm_hyp_vm(hyp_vm);
}

static void handle___kvm_flush_cpu_context(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(struct kvm_s2_mmu *, mmu, host_ctxt, 1);

	__kvm_flush_cpu_context(kern_hyp_va(mmu));
}

static void handle___kvm_timer_set_cntvoff(struct kvm_cpu_context *host_ctxt)
{
	__kvm_timer_set_cntvoff(cpu_reg(host_ctxt, 1));
}

static void handle___kvm_enable_ssbs(struct kvm_cpu_context *host_ctxt)
{
	u64 tmp;

	tmp = read_sysreg_el2(SYS_SCTLR);
	tmp |= SCTLR_ELx_DSSBS;
	write_sysreg_el2(tmp, SYS_SCTLR);
}

static void handle___vgic_v3_get_gic_config(struct kvm_cpu_context *host_ctxt)
{
	cpu_reg(host_ctxt, 1) = __vgic_v3_get_gic_config();
}

static void handle___vgic_v3_init_lrs(struct kvm_cpu_context *host_ctxt)
{
	__vgic_v3_init_lrs();
}

static void handle___kvm_get_mdcr_el2(struct kvm_cpu_context *host_ctxt)
{
	cpu_reg(host_ctxt, 1) = __kvm_get_mdcr_el2();
}

static void handle___vgic_v3_save_vmcr_aprs(struct kvm_cpu_context *host_ctxt)
{
	struct pkvm_hyp_vcpu *hyp_vcpu;
	struct kvm_vcpu *host_vcpu;

	host_vcpu = get_host_hyp_vcpus_from_vgic_v3_cpu_if(host_ctxt, 1,
							   &hyp_vcpu);
	if (!host_vcpu)
		return;

	if (unlikely(hyp_vcpu)) {
		struct vgic_v3_cpu_if *hyp_cpu_if, *host_cpu_if;
		int i;

		hyp_cpu_if = &hyp_vcpu->vcpu.arch.vgic_cpu.vgic_v3;
		__vgic_v3_save_vmcr_aprs(hyp_cpu_if);

		host_cpu_if = &host_vcpu->arch.vgic_cpu.vgic_v3;
		host_cpu_if->vgic_vmcr = hyp_cpu_if->vgic_vmcr;
		for (i = 0; i < ARRAY_SIZE(host_cpu_if->vgic_ap0r); i++) {
			host_cpu_if->vgic_ap0r[i] = hyp_cpu_if->vgic_ap0r[i];
			host_cpu_if->vgic_ap1r[i] = hyp_cpu_if->vgic_ap1r[i];
		}
	} else {
		__vgic_v3_save_vmcr_aprs(&host_vcpu->arch.vgic_cpu.vgic_v3);
	}
}

static void handle___vgic_v3_restore_vmcr_aprs(struct kvm_cpu_context *host_ctxt)
{
	struct pkvm_hyp_vcpu *hyp_vcpu;
	struct kvm_vcpu *host_vcpu;

	host_vcpu = get_host_hyp_vcpus_from_vgic_v3_cpu_if(host_ctxt, 1,
							   &hyp_vcpu);
	if (!host_vcpu)
		return;

	if (unlikely(hyp_vcpu)) {
		struct vgic_v3_cpu_if *hyp_cpu_if, *host_cpu_if;
		int i;

		hyp_cpu_if = &hyp_vcpu->vcpu.arch.vgic_cpu.vgic_v3;
		host_cpu_if = &host_vcpu->arch.vgic_cpu.vgic_v3;

		hyp_cpu_if->vgic_vmcr = host_cpu_if->vgic_vmcr;
		/* Should be a one-off */
		hyp_cpu_if->vgic_sre = (ICC_SRE_EL1_DIB |
					ICC_SRE_EL1_DFB |
					ICC_SRE_EL1_SRE);
		for (i = 0; i < ARRAY_SIZE(host_cpu_if->vgic_ap0r); i++) {
			hyp_cpu_if->vgic_ap0r[i] = host_cpu_if->vgic_ap0r[i];
			hyp_cpu_if->vgic_ap1r[i] = host_cpu_if->vgic_ap1r[i];
		}

		__vgic_v3_restore_vmcr_aprs(hyp_cpu_if);
	} else {
		__vgic_v3_restore_vmcr_aprs(&host_vcpu->arch.vgic_cpu.vgic_v3);
	}
}

static void handle___pkvm_init(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(phys_addr_t, phys, host_ctxt, 1);
	DECLARE_REG(unsigned long, size, host_ctxt, 2);
	DECLARE_REG(unsigned long, nr_cpus, host_ctxt, 3);
	DECLARE_REG(unsigned long *, per_cpu_base, host_ctxt, 4);
	DECLARE_REG(u32, hyp_va_bits, host_ctxt, 5);

	/*
	 * __pkvm_init() will return only if an error occurred, otherwise it
	 * will tail-call in __pkvm_init_finalise() which will have to deal
	 * with the host context directly.
	 */
	cpu_reg(host_ctxt, 1) = __pkvm_init(phys, size, nr_cpus, per_cpu_base,
					    hyp_va_bits);
}

static void handle___pkvm_cpu_set_vector(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(enum arm64_hyp_spectre_vector, slot, host_ctxt, 1);

	cpu_reg(host_ctxt, 1) = pkvm_cpu_set_vector(slot);
}

static void handle___pkvm_host_share_hyp(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(u64, pfn, host_ctxt, 1);

	cpu_reg(host_ctxt, 1) = __pkvm_host_share_hyp(pfn);
}

static void handle___pkvm_host_unshare_hyp(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(u64, pfn, host_ctxt, 1);

	cpu_reg(host_ctxt, 1) = __pkvm_host_unshare_hyp(pfn);
}

static void handle___pkvm_reclaim_dying_guest_page(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(pkvm_handle_t, handle, host_ctxt, 1);
	DECLARE_REG(u64, pfn, host_ctxt, 2);
	DECLARE_REG(u64, gfn, host_ctxt, 3);
	DECLARE_REG(u64, order, host_ctxt, 4);

	cpu_reg(host_ctxt, 1) =
		__pkvm_reclaim_dying_guest_page(handle, pfn, gfn, order);
}

static void handle___pkvm_reclaim_dying_guest_ffa_resources(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(pkvm_handle_t, handle, host_ctxt, 1);

	cpu_reg(host_ctxt, 1) = __pkvm_reclaim_dying_guest_ffa_resources(handle);
}

static void handle___pkvm_notify_guest_vm_avail(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(pkvm_handle_t, handle, host_ctxt, 1);

	cpu_reg(host_ctxt, 1) = __pkvm_notify_guest_vm_avail(handle);
}

static void handle___pkvm_create_private_mapping(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(phys_addr_t, phys, host_ctxt, 1);
	DECLARE_REG(size_t, size, host_ctxt, 2);
	DECLARE_REG(enum kvm_pgtable_prot, prot, host_ctxt, 3);

	/*
	 * __pkvm_create_private_mapping() populates a pointer with the
	 * hypervisor start address of the allocation.
	 *
	 * However, handle___pkvm_create_private_mapping() hypercall crosses the
	 * EL1/EL2 boundary so the pointer would not be valid in this context.
	 *
	 * Instead pass the allocation address as the return value (or return
	 * ERR_PTR() on failure).
	 */
	unsigned long haddr;
	int err = __pkvm_create_private_mapping(phys, size, prot, &haddr);

	if (err)
		haddr = (unsigned long)ERR_PTR(err);

	cpu_reg(host_ctxt, 1) = haddr;
}

static void handle___pkvm_prot_finalize(struct kvm_cpu_context *host_ctxt)
{
	cpu_reg(host_ctxt, 1) = __pkvm_prot_finalize();
}

static void handle___pkvm_init_vm(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(struct kvm *, host_kvm, host_ctxt, 1);
	DECLARE_REG(unsigned long, pgd_hva, host_ctxt, 2);

	host_kvm = kern_hyp_va(host_kvm);
	cpu_reg(host_ctxt, 1) = __pkvm_init_vm(host_kvm, pgd_hva);
	cpu_reg(host_ctxt, 3) = hyp_alloc_missing_donations();
}

static void handle___pkvm_init_vcpu(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(pkvm_handle_t, handle, host_ctxt, 1);
	DECLARE_REG(struct kvm_vcpu *, host_vcpu, host_ctxt, 2);

	host_vcpu = kern_hyp_va(host_vcpu);
	cpu_reg(host_ctxt, 1) = __pkvm_init_vcpu(handle, host_vcpu);
	cpu_reg(host_ctxt, 3) = hyp_alloc_missing_donations();
}

static void handle___pkvm_start_teardown_vm(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(pkvm_handle_t, handle, host_ctxt, 1);

	cpu_reg(host_ctxt, 1) = __pkvm_start_teardown_vm(handle);
}

static void handle___pkvm_finalize_teardown_vm(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(pkvm_handle_t, handle, host_ctxt, 1);

	cpu_reg(host_ctxt, 1) = __pkvm_finalize_teardown_vm(handle);
}

static void handle___pkvm_update_clock_tracing(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(u32, mult, host_ctxt, 1);
	DECLARE_REG(u32, shift, host_ctxt, 2);
	DECLARE_REG(u64, epoch_ns, host_ctxt, 3);
	DECLARE_REG(u64, epoch_cyc, host_ctxt, 4);

	__pkvm_update_clock_tracing(mult, shift, epoch_ns, epoch_cyc);

	cpu_reg(host_ctxt, 1) = 0;
}

static void handle___pkvm_load_tracing(struct kvm_cpu_context *host_ctxt)
{
	 DECLARE_REG(unsigned long, desc_hva, host_ctxt, 1);
	 DECLARE_REG(size_t, desc_size, host_ctxt, 2);

	 cpu_reg(host_ctxt, 1) = __pkvm_load_tracing(desc_hva, desc_size);
	 cpu_reg(host_ctxt, 3) = hyp_alloc_missing_donations();
}

static void handle___pkvm_teardown_tracing(struct kvm_cpu_context *host_ctxt)
{
	cpu_reg(host_ctxt, 1) = __pkvm_teardown_tracing();
}

static void handle___pkvm_enable_tracing(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(bool, enable, host_ctxt, 1);

	cpu_reg(host_ctxt, 1) = __pkvm_enable_tracing(enable);
}

static void handle___pkvm_reset_tracing(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(unsigned int, cpu, host_ctxt, 1);

	cpu_reg(host_ctxt, 1) = __pkvm_reset_tracing(cpu);
}

static void handle___pkvm_swap_reader_tracing(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(unsigned int, cpu, host_ctxt, 1);

	cpu_reg(host_ctxt, 1) = __pkvm_swap_reader_tracing(cpu);
}

static void handle___pkvm_enable_event(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(unsigned short, id, host_ctxt, 1);
	DECLARE_REG(bool, enable, host_ctxt, 2);

	cpu_reg(host_ctxt, 1) = __pkvm_enable_event(id, enable);
}

static void handle___pkvm_selftest_event(struct kvm_cpu_context *host_ctxt)
{
	int smc_ret = SMCCC_RET_NOT_SUPPORTED, ret = -EOPNOTSUPP;

#ifdef CONFIG_PKVM_SELFTESTS
	trace_selftest();
	smc_ret = SMCCC_RET_SUCCESS;
	ret = 0;
#endif
	cpu_reg(host_ctxt, 0) = smc_ret;
	cpu_reg(host_ctxt, 1) = ret;
}

static void handle___pkvm_sync_ftrace(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(unsigned long, host_func_pg, host_ctxt, 1);

	cpu_reg(host_ctxt, 1) = __pkvm_sync_ftrace(host_func_pg);
}

static void handle___pkvm_disable_ftrace(struct kvm_cpu_context *host_ctxt)
{
	cpu_reg(host_ctxt, 1) = __pkvm_disable_ftrace();
}

static void handle___pkvm_alloc_module_va(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(u64, nr_pages, host_ctxt, 1);

	cpu_reg(host_ctxt, 1) = (u64)__pkvm_alloc_module_va(nr_pages);
}

static void handle___pkvm_map_module_page(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(u64, pfn, host_ctxt, 1);
	DECLARE_REG(void *, va, host_ctxt, 2);
	DECLARE_REG(enum kvm_pgtable_prot, prot, host_ctxt, 3);

	cpu_reg(host_ctxt, 1) = (u64)__pkvm_map_module_pages(pfn, va, 1, prot, false);
}

static void handle___pkvm_unmap_module_page(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(u64, pfn, host_ctxt, 1);
	DECLARE_REG(void *, va, host_ctxt, 2);
	int ret;

	ret = __pkvm_unmap_module_pages(pfn, va, 1);
	if (!ret)
		WARN_ON(__pkvm_hyp_donate_host(pfn, 1));

	cpu_reg(host_ctxt, 1) = ret;
}

static void handle___pkvm_init_module(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(void *, host_mod, host_ctxt, 1);

	cpu_reg(host_ctxt, 1) = __pkvm_init_module(host_mod);
}

static void handle___pkvm_register_hcall(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(unsigned long, hfn_hyp_va, host_ctxt, 1);

	cpu_reg(host_ctxt, 1) = __pkvm_register_hcall(hfn_hyp_va);
}

static void handle___pkvm_hyp_alloc_mgt_refill(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(unsigned long, id, host_ctxt, 1);
	DECLARE_REG(phys_addr_t, phys, host_ctxt, 2);
	DECLARE_REG(unsigned long, nr_pages, host_ctxt, 3);
	struct kvm_hyp_memcache mc = {
		.head		= phys,
		.nr_pages	= nr_pages,
	};

	cpu_reg(host_ctxt, 1) = hyp_alloc_mgt_refill(id, &mc);
	cpu_reg(host_ctxt, 2) = mc.head;
	cpu_reg(host_ctxt, 3) = mc.nr_pages;
}

static void handle___pkvm_hyp_alloc_mgt_reclaimable(struct kvm_cpu_context *host_ctxt)
{
	cpu_reg(host_ctxt, 1) = hyp_alloc_mgt_reclaimable();
}

static void handle___pkvm_hyp_alloc_mgt_reclaim(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(int, target, host_ctxt, 1);
	struct kvm_hyp_memcache mc = {
		.head		= 0,
		.nr_pages	= 0,
	};

	hyp_alloc_mgt_reclaim(&mc, target);

	cpu_reg(host_ctxt, 1) = mc.head;
	cpu_reg(host_ctxt, 2) = mc.nr_pages;
}

static void handle___pkvm_host_iommu_alloc_domain(struct kvm_cpu_context *host_ctxt)
{
	int ret;
	DECLARE_REG(pkvm_handle_t, domain, host_ctxt, 1);
	DECLARE_REG(int, type, host_ctxt, 2);

	ret = kvm_iommu_alloc_domain(domain, type);
	hyp_reqs_smccc_encode(ret, host_ctxt, this_cpu_ptr(&host_hyp_reqs));
}

static void handle___pkvm_host_iommu_free_domain(struct kvm_cpu_context *host_ctxt)
{
	int ret;
	DECLARE_REG(pkvm_handle_t, domain, host_ctxt, 1);

	ret = kvm_iommu_free_domain(domain);
	hyp_reqs_smccc_encode(ret, host_ctxt, this_cpu_ptr(&host_hyp_reqs));
}

static void handle___pkvm_host_iommu_iotlb_inv_nested_domain(struct kvm_cpu_context *host_ctxt)
{
	int ret;
	DECLARE_REG(pkvm_handle_t, domain, host_ctxt, 1);
	DECLARE_REG(unsigned long, iova, host_ctxt, 2);
	DECLARE_REG(size_t, size, host_ctxt, 3);
	DECLARE_REG(size_t, granule, host_ctxt, 4);
	DECLARE_REG(bool, leaf, host_ctxt, 5);

	ret = kvm_iommu_iotlb_inv_nested_domain(domain, iova, size, granule, leaf);
	hyp_reqs_smccc_encode(ret, host_ctxt, this_cpu_ptr(&host_hyp_reqs));
}

static void handle___pkvm_host_iommu_nested_cfg_sync(struct kvm_cpu_context *host_ctxt)
{
	int ret;
	DECLARE_REG(pkvm_handle_t, iommu, host_ctxt, 1);
	DECLARE_REG(void *, cmd_desc_hva, host_ctxt, 2);
	DECLARE_REG(size_t, cmd_desc_size, host_ctxt, 3);

	ret = kvm_iommu_nested_cfg_sync(iommu, cmd_desc_hva, cmd_desc_size);
	hyp_reqs_smccc_encode(ret, host_ctxt, this_cpu_ptr(&host_hyp_reqs));
}

static void handle___pkvm_host_iommu_attach_dev(struct kvm_cpu_context *host_ctxt)
{
	int ret;
	DECLARE_REG(pkvm_handle_t, iommu, host_ctxt, 1);
	DECLARE_REG(pkvm_handle_t, domain, host_ctxt, 2);
	DECLARE_REG(unsigned int, endpoint, host_ctxt, 3);
	DECLARE_REG(unsigned int, pasid, host_ctxt, 4);
	DECLARE_REG(unsigned int, pasid_bits, host_ctxt, 5);
	DECLARE_REG(unsigned long, flags, host_ctxt, 6);

	ret = kvm_iommu_attach_dev(iommu, domain, endpoint,
				   pasid, pasid_bits, flags);
	hyp_reqs_smccc_encode(ret, host_ctxt, this_cpu_ptr(&host_hyp_reqs));
}

static void handle___pkvm_host_iommu_attach_dev_nested(struct kvm_cpu_context *host_ctxt)
{
	int ret;
	DECLARE_REG(pkvm_handle_t, iommu, host_ctxt, 1);
	DECLARE_REG(pkvm_handle_t, domain, host_ctxt, 2);
	DECLARE_REG(unsigned int, endpoint, host_ctxt, 3);
	DECLARE_REG(unsigned int, pasid, host_ctxt, 4);
	DECLARE_REG(unsigned long, flags, host_ctxt, 5);
	DECLARE_REG(void *, s1_desc_hva, host_ctxt, 6);
	DECLARE_REG(size_t, s1_desc_size, host_ctxt, 7);

	ret = kvm_iommu_attach_dev_nested(iommu, domain, endpoint, pasid, flags, s1_desc_hva,
					  s1_desc_size);
	hyp_reqs_smccc_encode(ret, host_ctxt, this_cpu_ptr(&host_hyp_reqs));
}

static void handle___pkvm_host_iommu_detach_dev(struct kvm_cpu_context *host_ctxt)
{
	int ret;
	DECLARE_REG(pkvm_handle_t, iommu, host_ctxt, 1);
	DECLARE_REG(pkvm_handle_t, domain, host_ctxt, 2);
	DECLARE_REG(unsigned int, endpoint, host_ctxt, 3);
	DECLARE_REG(unsigned int, pasid, host_ctxt, 4);

	ret = kvm_iommu_detach_dev(iommu, domain, endpoint, pasid);
	hyp_reqs_smccc_encode(ret, host_ctxt, this_cpu_ptr(&host_hyp_reqs));
}

static void handle___pkvm_host_iommu_detach_dev_nested(struct kvm_cpu_context *host_ctxt)
{
	int ret;
	DECLARE_REG(pkvm_handle_t, iommu, host_ctxt, 1);
	DECLARE_REG(pkvm_handle_t, domain, host_ctxt, 2);
	DECLARE_REG(unsigned int, endpoint, host_ctxt, 3);
	DECLARE_REG(unsigned int, pasid, host_ctxt, 4);

	ret = kvm_iommu_detach_dev_nested(iommu, domain, endpoint, pasid);
	hyp_reqs_smccc_encode(ret, host_ctxt, this_cpu_ptr(&host_hyp_reqs));
}

static void handle___pkvm_host_iommu_map_pages(struct kvm_cpu_context *host_ctxt)
{
	int ret;
	unsigned long mapped;
	DECLARE_REG(pkvm_handle_t, domain, host_ctxt, 1);
	DECLARE_REG(unsigned long, iova, host_ctxt, 2);
	DECLARE_REG(phys_addr_t, paddr, host_ctxt, 3);
	DECLARE_REG(size_t, pgsize, host_ctxt, 4);
	DECLARE_REG(size_t, pgcount, host_ctxt, 5);
	DECLARE_REG(unsigned int, prot, host_ctxt, 6);

	ret = kvm_iommu_map_pages(domain, iova, paddr,
				  pgsize, pgcount, prot, &mapped);
	cpu_reg(host_ctxt, 0) = ret;
	hyp_reqs_smccc_encode(mapped, host_ctxt, this_cpu_ptr(&host_hyp_reqs));
}

static void handle___pkvm_host_iommu_unmap_pages(struct kvm_cpu_context *host_ctxt)
{
	unsigned long ret;
	DECLARE_REG(pkvm_handle_t, domain, host_ctxt, 1);
	DECLARE_REG(unsigned long, iova, host_ctxt, 2);
	DECLARE_REG(size_t, pgsize, host_ctxt, 3);
	DECLARE_REG(size_t, pgcount, host_ctxt, 4);

	ret = kvm_iommu_unmap_pages(domain, iova,
				    pgsize, pgcount);
	hyp_reqs_smccc_encode(ret, host_ctxt, this_cpu_ptr(&host_hyp_reqs));
}

static void handle___pkvm_host_iommu_iova_to_phys(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(pkvm_handle_t, domain, host_ctxt, 1);
	DECLARE_REG(unsigned long, iova, host_ctxt, 2);

	cpu_reg(host_ctxt, 1) = kvm_iommu_iova_to_phys(domain, iova);
}

static void handle___pkvm_host_iommu_iotlb_sync_map(struct kvm_cpu_context *host_ctxt)
{
	unsigned long ret;
	DECLARE_REG(pkvm_handle_t, domain, host_ctxt, 1);
	DECLARE_REG(unsigned long, iova, host_ctxt, 2);
	DECLARE_REG(size_t, size, host_ctxt, 3);

	ret = kvm_iommu_iotlb_sync_map(domain, iova, size);
	hyp_reqs_smccc_encode(ret, host_ctxt, this_cpu_ptr(&host_hyp_reqs));
}

static void handle___pkvm_host_hvc_pd(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(u64, device_id, host_ctxt, 1);
	DECLARE_REG(u64, on, host_ctxt, 2);

	cpu_reg(host_ctxt, 1) = pkvm_host_hvc_pd(device_id, on);
}

static void handle___pkvm_iommu_init(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(struct kvm_iommu_ops *, ops, host_ctxt, 1);
	DECLARE_REG(unsigned long, mc_head, host_ctxt, 2);
	DECLARE_REG(unsigned long, nr_pages, host_ctxt, 3);
	struct kvm_hyp_memcache mc = {.head = mc_head, .nr_pages = nr_pages};

	cpu_reg(host_ctxt, 1) = kvm_iommu_init(ops, &mc);
}

static void handle___pkvm_ptdump(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(pkvm_handle_t, handle, host_ctxt, 1);
	DECLARE_REG(enum pkvm_ptdump_ops, op, host_ctxt, 2);
	DECLARE_REG(struct pkvm_ptdump_log_hdr *, log, host_ctxt, 3);

	if (op == PKVM_PTDUMP_GET_LEVEL || op == PKVM_PTDUMP_GET_RANGE)
		cpu_reg(host_ctxt, 1) = __pkvm_ptdump_get_config(handle, op);
	else if (op == PKVM_PTDUMP_WALK_RANGE)
		cpu_reg(host_ctxt, 1) = __pkvm_ptdump_walk_range(handle, log);
	else
		cpu_reg(host_ctxt, 0) = SMCCC_RET_NOT_SUPPORTED;
}

static void handle___pkvm_devices_init(struct kvm_cpu_context *host_ctxt)
{
	/*
	 * Devices must be initialised after the IOMMUs driver is initialised.
	 * We do this in a separate HVC to avoid complexity.
	 */
	cpu_reg(host_ctxt, 1) = pkvm_init_devices();
}

static void handle___pkvm_host_iommu_map_sg(struct kvm_cpu_context *host_ctxt)
{
	unsigned long ret;
	DECLARE_REG(pkvm_handle_t, domain, host_ctxt, 1);
	DECLARE_REG(unsigned long, iova, host_ctxt, 2);
	DECLARE_REG(struct kvm_iommu_sg *, sg, host_ctxt, 3);
	DECLARE_REG(unsigned int, nent, host_ctxt, 4);
	DECLARE_REG(unsigned int, prot, host_ctxt, 5);

	ret = kvm_iommu_map_sg(domain, iova, kern_hyp_va(sg), nent, prot);
	hyp_reqs_smccc_encode(ret, host_ctxt, this_cpu_ptr(&host_hyp_reqs));
}

static void handle___pkvm_host_donate_hyp_mmio(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(u64, pfn, host_ctxt, 1);
	DECLARE_REG(u64, nr_pages, host_ctxt, 2);

	if (!is_protected_kvm_enabled())
		return;

	cpu_reg(host_ctxt, 1) = pkvm_device_hyp_assign_mmio(pfn, nr_pages);
}

static void handle___pkvm_host_reclaim_hyp_mmio(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(u64, pfn, host_ctxt, 1);
	DECLARE_REG(u64, nr_pages, host_ctxt, 2);

	if (!is_protected_kvm_enabled())
		return;

	cpu_reg(host_ctxt, 1) = pkvm_device_reclaim_mmio(pfn, nr_pages);
}

static void handle___pkvm_host_map_guest_mmio(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(u64, pfn, host_ctxt, 1);
	DECLARE_REG(u64, gfn, host_ctxt, 2);
	struct pkvm_hyp_vcpu *hyp_vcpu;
	int ret = -EINVAL;

	if (!is_protected_kvm_enabled())
		goto out;

	hyp_vcpu = pkvm_get_loaded_hyp_vcpu();
	if (!hyp_vcpu)
		goto out;

	if (!pkvm_hyp_vcpu_is_protected(hyp_vcpu))
		goto out;

	/* Top-up our per-vcpu memcache from the host's */
	ret = pkvm_refill_memcache(hyp_vcpu);
	if (ret)
		goto out;

	ret = pkvm_host_map_guest_mmio(hyp_vcpu, pfn, gfn);

out:
	cpu_reg(host_ctxt, 1) = ret;
}

static void handle___pkvm_pviommu_attach(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(struct kvm *, host_kvm, host_ctxt, 1);
	DECLARE_REG(int, pviommu, host_ctxt, 2);

	cpu_reg(host_ctxt, 1) = pkvm_pviommu_attach(host_kvm, pviommu);
}

static void handle___pkvm_pviommu_add_vsid(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(struct kvm *, host_kvm, host_ctxt, 1);
	DECLARE_REG(pkvm_handle_t, pviommu, host_ctxt, 2);
	DECLARE_REG(pkvm_handle_t, iommu, host_ctxt, 3);
	DECLARE_REG(pkvm_handle_t, sid, host_ctxt, 4);
	DECLARE_REG(pkvm_handle_t, vsid, host_ctxt, 5);

	cpu_reg(host_ctxt, 1) = pkvm_pviommu_add_vsid(host_kvm, pviommu, iommu, sid, vsid);
}

static void handle___pkvm_host_get_ffa_version(struct kvm_cpu_context *host_ctxt)
{
	cpu_reg(host_ctxt, 1) = ffa_get_hypervisor_version();
}

typedef void (*hcall_t)(struct kvm_cpu_context *);

#define HANDLE_FUNC(x)	[__KVM_HOST_SMCCC_FUNC_##x] = (hcall_t)handle_##x

static const hcall_t host_hcall[] = {
	/* ___kvm_hyp_init */
	HANDLE_FUNC(__kvm_get_mdcr_el2),
	HANDLE_FUNC(__pkvm_init),
	HANDLE_FUNC(__pkvm_create_private_mapping),
	HANDLE_FUNC(__pkvm_cpu_set_vector),
	HANDLE_FUNC(__kvm_enable_ssbs),
	HANDLE_FUNC(__vgic_v3_init_lrs),
	HANDLE_FUNC(__vgic_v3_get_gic_config),
	HANDLE_FUNC(__kvm_flush_vm_context),
	HANDLE_FUNC(__kvm_tlb_flush_vmid_ipa),
	HANDLE_FUNC(__kvm_tlb_flush_vmid_ipa_nsh),
	HANDLE_FUNC(__kvm_tlb_flush_vmid),
	HANDLE_FUNC(__kvm_tlb_flush_vmid_range),
	HANDLE_FUNC(__kvm_flush_cpu_context),
	HANDLE_FUNC(__pkvm_alloc_module_va),
	HANDLE_FUNC(__pkvm_map_module_page),
	HANDLE_FUNC(__pkvm_unmap_module_page),
	HANDLE_FUNC(__pkvm_init_module),
	HANDLE_FUNC(__pkvm_register_hcall),
	HANDLE_FUNC(__pkvm_iommu_init),
	HANDLE_FUNC(__pkvm_devices_init),
	HANDLE_FUNC(__pkvm_prot_finalize),

	HANDLE_FUNC(__pkvm_host_share_hyp),
	HANDLE_FUNC(__pkvm_host_unshare_hyp),
	HANDLE_FUNC(__pkvm_host_donate_guest),
	HANDLE_FUNC(__pkvm_host_donate_guest_sglist),
	HANDLE_FUNC(__pkvm_host_share_guest),
	HANDLE_FUNC(__pkvm_host_unshare_guest),
	HANDLE_FUNC(__pkvm_host_relax_perms_guest),
	HANDLE_FUNC(__pkvm_host_wrprotect_guest),
	HANDLE_FUNC(__pkvm_host_test_clear_young_guest),
	HANDLE_FUNC(__pkvm_host_mkyoung_guest),
	HANDLE_FUNC(__pkvm_host_split_guest),
	HANDLE_FUNC(__kvm_adjust_pc),
	HANDLE_FUNC(__kvm_vcpu_run),
	HANDLE_FUNC(__kvm_timer_set_cntvoff),
	HANDLE_FUNC(__vgic_v3_save_vmcr_aprs),
	HANDLE_FUNC(__vgic_v3_restore_vmcr_aprs),
	HANDLE_FUNC(__pkvm_init_vm),
	HANDLE_FUNC(__pkvm_init_vcpu),
	HANDLE_FUNC(__pkvm_start_teardown_vm),
	HANDLE_FUNC(__pkvm_finalize_teardown_vm),
	HANDLE_FUNC(__pkvm_reclaim_dying_guest_page),
	HANDLE_FUNC(__pkvm_reclaim_dying_guest_ffa_resources),
	HANDLE_FUNC(__pkvm_notify_guest_vm_avail),
	HANDLE_FUNC(__pkvm_vcpu_load),
	HANDLE_FUNC(__pkvm_vcpu_put),
	HANDLE_FUNC(__pkvm_vcpu_sync_state),
	HANDLE_FUNC(__pkvm_update_clock_tracing),
	HANDLE_FUNC(__pkvm_load_tracing),
	HANDLE_FUNC(__pkvm_teardown_tracing),
	HANDLE_FUNC(__pkvm_enable_tracing),
	HANDLE_FUNC(__pkvm_reset_tracing),
	HANDLE_FUNC(__pkvm_swap_reader_tracing),
	HANDLE_FUNC(__pkvm_enable_event),
	HANDLE_FUNC(__pkvm_selftest_event),
	HANDLE_FUNC(__pkvm_sync_ftrace),
	HANDLE_FUNC(__pkvm_disable_ftrace),
	HANDLE_FUNC(__pkvm_tlb_flush_vmid),
	HANDLE_FUNC(__pkvm_hyp_alloc_mgt_refill),
	HANDLE_FUNC(__pkvm_hyp_alloc_mgt_reclaimable),
	HANDLE_FUNC(__pkvm_hyp_alloc_mgt_reclaim),
	HANDLE_FUNC(__pkvm_host_iommu_alloc_domain),
	HANDLE_FUNC(__pkvm_host_iommu_free_domain),
	HANDLE_FUNC(__pkvm_host_iommu_attach_dev),
	HANDLE_FUNC(__pkvm_host_iommu_attach_dev_nested),
	HANDLE_FUNC(__pkvm_host_iommu_detach_dev),
	HANDLE_FUNC(__pkvm_host_iommu_detach_dev_nested),
	HANDLE_FUNC(__pkvm_host_iommu_iotlb_inv_nested_domain),
	HANDLE_FUNC(__pkvm_host_iommu_nested_cfg_sync),
	HANDLE_FUNC(__pkvm_host_iommu_map_pages),
	HANDLE_FUNC(__pkvm_host_iommu_unmap_pages),
	HANDLE_FUNC(__pkvm_host_iommu_iova_to_phys),
	HANDLE_FUNC(__pkvm_host_iommu_iotlb_sync_map),
	HANDLE_FUNC(__pkvm_host_hvc_pd),
	HANDLE_FUNC(__pkvm_ptdump),
	HANDLE_FUNC(__pkvm_host_iommu_map_sg),
	HANDLE_FUNC(__pkvm_host_donate_hyp_mmio),
	HANDLE_FUNC(__pkvm_host_reclaim_hyp_mmio),
	HANDLE_FUNC(__pkvm_host_map_guest_mmio),
	HANDLE_FUNC(__pkvm_pviommu_attach),
	HANDLE_FUNC(__pkvm_pviommu_add_vsid),
	HANDLE_FUNC(__pkvm_host_get_ffa_version),
};

static void handle_host_hcall(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(unsigned long, id, host_ctxt, 0);
	unsigned long hcall_min = 0;
	hcall_t hfn;

	/*
	 * If pKVM has been initialised then reject any calls to the
	 * early "privileged" hypercalls. Note that we cannot reject
	 * calls to __pkvm_prot_finalize for two reasons: (1) The static
	 * key used to determine initialisation must be toggled prior to
	 * finalisation and (2) finalisation is performed on a per-CPU
	 * basis. This is all fine, however, since __pkvm_prot_finalize
	 * returns -EPERM after the first call for a given CPU.
	 */
	if (static_branch_unlikely(&kvm_protected_mode_initialized))
		hcall_min = __KVM_HOST_SMCCC_FUNC___pkvm_prot_finalize;

	id &= ~ARM_SMCCC_CALL_HINTS;
	id -= KVM_HOST_SMCCC_ID(0);

	if (handle_host_dynamic_hcall(&host_ctxt->regs, id) == HCALL_HANDLED)
		goto end;

	if (unlikely(id < hcall_min || id >= ARRAY_SIZE(host_hcall)))
		goto inval;

	hfn = host_hcall[id];
	if (unlikely(!hfn))
		goto inval;

	cpu_reg(host_ctxt, 0) = SMCCC_RET_SUCCESS;
	hfn(host_ctxt);
end:
	trace_host_hcall(id, 0);

	return;
inval:
	trace_host_hcall(id, 1);
	cpu_reg(host_ctxt, 0) = SMCCC_RET_NOT_SUPPORTED;
}

static void handle_host_smc(struct kvm_cpu_context *host_ctxt)
{
	DECLARE_REG(u64, func_id, host_ctxt, 0);
	bool handled;

	func_id &= ~ARM_SMCCC_CALL_HINTS;

	handled = kvm_host_psci_handler(host_ctxt, func_id);
	if (!handled)
		handled = kvm_host_ffa_handler(host_ctxt, func_id);
	if (!handled)
		handled = kvm_host_scmi_handler(host_ctxt);
	if (!handled)
		handled = module_handle_host_smc(&host_ctxt->regs);
	if (!handled) {
		__hyp_exit();
		__kvm_hyp_host_forward_smc(host_ctxt);
		__hyp_enter();
	}

	trace_host_smc(func_id, !handled);

	/* SMC was trapped, move ELR past the current PC. */
	kvm_skip_host_instr();
}

void handle_trap(struct kvm_cpu_context *host_ctxt)
{
	u64 esr = read_sysreg_el2(SYS_ESR);

	__hyp_enter();

	switch (ESR_ELx_EC(esr)) {
	case ESR_ELx_EC_HVC64:
		handle_host_hcall(host_ctxt);
		break;
	case ESR_ELx_EC_SMC64:
		handle_host_smc(host_ctxt);
		break;
	case ESR_ELx_EC_IABT_LOW:
	case ESR_ELx_EC_DABT_LOW:
		handle_host_mem_abort(host_ctxt);
		break;
	default:
		BUG_ON(!READ_ONCE(default_trap_handler) || !default_trap_handler(&host_ctxt->regs));
	}

	__hyp_exit();
}