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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2023 Ventana Micro Systems Inc.
*/
#include <linux/kconfig.h>
#include <linux/kernel.h>
#include <linux/kvm_host.h>
#include <asm/kvm_vcpu_sbi.h>
#include <asm/sbi.h>
void kvm_riscv_vcpu_sbi_sta_reset(struct kvm_vcpu *vcpu)
{
vcpu->arch.sta.shmem = INVALID_GPA;
vcpu->arch.sta.last_steal = 0;
}
void kvm_riscv_vcpu_record_steal_time(struct kvm_vcpu *vcpu)
{
gpa_t shmem = vcpu->arch.sta.shmem;
if (shmem == INVALID_GPA)
return;
}
static int kvm_sbi_sta_steal_time_set_shmem(struct kvm_vcpu *vcpu)
{
return SBI_ERR_FAILURE;
}
static int kvm_sbi_ext_sta_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
struct kvm_vcpu_sbi_return *retdata)
{
struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
unsigned long funcid = cp->a6;
int ret;
switch (funcid) {
case SBI_EXT_STA_STEAL_TIME_SET_SHMEM:
ret = kvm_sbi_sta_steal_time_set_shmem(vcpu);
break;
default:
ret = SBI_ERR_NOT_SUPPORTED;
break;
}
retdata->err_val = ret;
return 0;
}
static unsigned long kvm_sbi_ext_sta_probe(struct kvm_vcpu *vcpu)
{
return 0;
}
const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_sta = {
.extid_start = SBI_EXT_STA,
.extid_end = SBI_EXT_STA,
.handler = kvm_sbi_ext_sta_handler,
.probe = kvm_sbi_ext_sta_probe,
};
int kvm_riscv_vcpu_get_reg_sbi_sta(struct kvm_vcpu *vcpu,
unsigned long reg_num,
unsigned long *reg_val)
{
switch (reg_num) {
case KVM_REG_RISCV_SBI_STA_REG(shmem_lo):
*reg_val = (unsigned long)vcpu->arch.sta.shmem;
break;
case KVM_REG_RISCV_SBI_STA_REG(shmem_hi):
if (IS_ENABLED(CONFIG_32BIT))
*reg_val = upper_32_bits(vcpu->arch.sta.shmem);
else
*reg_val = 0;
break;
default:
return -EINVAL;
}
return 0;
}
int kvm_riscv_vcpu_set_reg_sbi_sta(struct kvm_vcpu *vcpu,
unsigned long reg_num,
unsigned long reg_val)
{
switch (reg_num) {
case KVM_REG_RISCV_SBI_STA_REG(shmem_lo):
if (IS_ENABLED(CONFIG_32BIT)) {
gpa_t hi = upper_32_bits(vcpu->arch.sta.shmem);
vcpu->arch.sta.shmem = reg_val;
vcpu->arch.sta.shmem |= hi << 32;
} else {
vcpu->arch.sta.shmem = reg_val;
}
break;
case KVM_REG_RISCV_SBI_STA_REG(shmem_hi):
if (IS_ENABLED(CONFIG_32BIT)) {
gpa_t lo = lower_32_bits(vcpu->arch.sta.shmem);
vcpu->arch.sta.shmem = ((gpa_t)reg_val << 32);
vcpu->arch.sta.shmem |= lo;
} else if (reg_val != 0) {
return -EINVAL;
}
break;
default:
return -EINVAL;
}
return 0;
}
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