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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2020 - Google Inc
* Author: Andrew Scull <ascull@google.com>
*/
#include <hyp/switch.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_emulate.h>
#include <asm/kvm_host.h>
#include <asm/kvm_hyp.h>
#include <asm/kvm_mmu.h>
#define cpu_reg(ctxt, r) (ctxt)->regs.regs[r]
#define DECLARE_REG(type, name, ctxt, reg) \
type name = (type)cpu_reg(ctxt, (reg))
static void handle___kvm_vcpu_run(struct kvm_cpu_context *host_ctxt)
{
DECLARE_REG(struct kvm_vcpu *, vcpu, host_ctxt, 1);
cpu_reg(host_ctxt, 1) = __kvm_vcpu_run(kern_hyp_va(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(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___kvm_tlb_flush_local_vmid(struct kvm_cpu_context *host_ctxt)
{
DECLARE_REG(struct kvm_s2_mmu *, mmu, host_ctxt, 1);
__kvm_tlb_flush_local_vmid(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_ich_vtr_el2(struct kvm_cpu_context *host_ctxt)
{
cpu_reg(host_ctxt, 1) = __vgic_v3_get_ich_vtr_el2();
}
static void handle___vgic_v3_read_vmcr(struct kvm_cpu_context *host_ctxt)
{
cpu_reg(host_ctxt, 1) = __vgic_v3_read_vmcr();
}
static void handle___vgic_v3_write_vmcr(struct kvm_cpu_context *host_ctxt)
{
__vgic_v3_write_vmcr(cpu_reg(host_ctxt, 1));
}
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_aprs(struct kvm_cpu_context *host_ctxt)
{
DECLARE_REG(struct vgic_v3_cpu_if *, cpu_if, host_ctxt, 1);
__vgic_v3_save_aprs(kern_hyp_va(cpu_if));
}
static void handle___vgic_v3_restore_aprs(struct kvm_cpu_context *host_ctxt)
{
DECLARE_REG(struct vgic_v3_cpu_if *, cpu_if, host_ctxt, 1);
__vgic_v3_restore_aprs(kern_hyp_va(cpu_if));
}
typedef void (*hcall_t)(struct kvm_cpu_context *);
#define HANDLE_FUNC(x) [__KVM_HOST_SMCCC_FUNC_##x] = kimg_fn_ptr(handle_##x)
static const hcall_t *host_hcall[] = {
HANDLE_FUNC(__kvm_vcpu_run),
HANDLE_FUNC(__kvm_flush_vm_context),
HANDLE_FUNC(__kvm_tlb_flush_vmid_ipa),
HANDLE_FUNC(__kvm_tlb_flush_vmid),
HANDLE_FUNC(__kvm_tlb_flush_local_vmid),
HANDLE_FUNC(__kvm_timer_set_cntvoff),
HANDLE_FUNC(__kvm_enable_ssbs),
HANDLE_FUNC(__vgic_v3_get_ich_vtr_el2),
HANDLE_FUNC(__vgic_v3_read_vmcr),
HANDLE_FUNC(__vgic_v3_write_vmcr),
HANDLE_FUNC(__vgic_v3_init_lrs),
HANDLE_FUNC(__kvm_get_mdcr_el2),
HANDLE_FUNC(__vgic_v3_save_aprs),
HANDLE_FUNC(__vgic_v3_restore_aprs),
};
static void handle_host_hcall(struct kvm_cpu_context *host_ctxt)
{
DECLARE_REG(unsigned long, id, host_ctxt, 0);
const hcall_t *kfn;
hcall_t hfn;
id -= KVM_HOST_SMCCC_ID(0);
if (unlikely(id >= ARRAY_SIZE(host_hcall)))
goto inval;
kfn = host_hcall[id];
if (unlikely(!kfn))
goto inval;
cpu_reg(host_ctxt, 0) = SMCCC_RET_SUCCESS;
hfn = kimg_fn_hyp_va(kfn);
hfn(host_ctxt);
return;
inval:
cpu_reg(host_ctxt, 0) = SMCCC_RET_NOT_SUPPORTED;
}
void handle_trap(struct kvm_cpu_context *host_ctxt)
{
u64 esr = read_sysreg_el2(SYS_ESR);
if (unlikely(ESR_ELx_EC(esr) != ESR_ELx_EC_HVC64))
hyp_panic();
handle_host_hcall(host_ctxt);
}
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