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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2021 Western Digital Corporation or its affiliates.
*
* Authors:
* Atish Patra <atish.patra@wdc.com>
*/
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/kvm_host.h>
#include <asm/csr.h>
#include <asm/sbi.h>
#include <asm/kvm_vcpu_timer.h>
#include <asm/kvm_vcpu_sbi.h>
static int kvm_sbi_ext_base_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
unsigned long *out_val,
struct kvm_cpu_trap *trap, bool *exit)
{
int ret = 0;
struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
struct sbiret ecall_ret;
switch (cp->a6) {
case SBI_EXT_BASE_GET_SPEC_VERSION:
*out_val = (KVM_SBI_VERSION_MAJOR <<
SBI_SPEC_VERSION_MAJOR_SHIFT) |
KVM_SBI_VERSION_MINOR;
break;
case SBI_EXT_BASE_GET_IMP_ID:
*out_val = KVM_SBI_IMPID;
break;
case SBI_EXT_BASE_GET_IMP_VERSION:
*out_val = 0;
break;
case SBI_EXT_BASE_PROBE_EXT:
if ((cp->a0 >= SBI_EXT_EXPERIMENTAL_START &&
cp->a0 <= SBI_EXT_EXPERIMENTAL_END) ||
(cp->a0 >= SBI_EXT_VENDOR_START &&
cp->a0 <= SBI_EXT_VENDOR_END)) {
/*
* For experimental/vendor extensions
* forward it to the userspace
*/
kvm_riscv_vcpu_sbi_forward(vcpu, run);
*exit = true;
} else
*out_val = kvm_vcpu_sbi_find_ext(cp->a0) ? 1 : 0;
break;
case SBI_EXT_BASE_GET_MVENDORID:
case SBI_EXT_BASE_GET_MARCHID:
case SBI_EXT_BASE_GET_MIMPID:
ecall_ret = sbi_ecall(SBI_EXT_BASE, cp->a6, 0, 0, 0, 0, 0, 0);
if (!ecall_ret.error)
*out_val = ecall_ret.value;
/*TODO: We are unnecessarily converting the error twice */
ret = sbi_err_map_linux_errno(ecall_ret.error);
break;
default:
ret = -EOPNOTSUPP;
break;
}
return ret;
}
const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_base = {
.extid_start = SBI_EXT_BASE,
.extid_end = SBI_EXT_BASE,
.handler = kvm_sbi_ext_base_handler,
};
static int kvm_sbi_ext_forward_handler(struct kvm_vcpu *vcpu,
struct kvm_run *run,
unsigned long *out_val,
struct kvm_cpu_trap *utrap,
bool *exit)
{
/*
* Both SBI experimental and vendor extensions are
* unconditionally forwarded to userspace.
*/
kvm_riscv_vcpu_sbi_forward(vcpu, run);
*exit = true;
return 0;
}
const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_experimental = {
.extid_start = SBI_EXT_EXPERIMENTAL_START,
.extid_end = SBI_EXT_EXPERIMENTAL_END,
.handler = kvm_sbi_ext_forward_handler,
};
const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_vendor = {
.extid_start = SBI_EXT_VENDOR_START,
.extid_end = SBI_EXT_VENDOR_END,
.handler = kvm_sbi_ext_forward_handler,
};
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