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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2019 Western Digital Corporation or its affiliates.
*
* Authors:
* Anup Patel <anup.patel@wdc.com>
*/
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/kvm_host.h>
#include <asm/csr.h>
#include <asm/cpufeature.h>
#include <asm/sbi.h>
long kvm_arch_dev_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
return -EINVAL;
}
int kvm_arch_hardware_enable(void)
{
unsigned long hideleg, hedeleg;
hedeleg = 0;
hedeleg |= (1UL << EXC_INST_MISALIGNED);
hedeleg |= (1UL << EXC_BREAKPOINT);
hedeleg |= (1UL << EXC_SYSCALL);
hedeleg |= (1UL << EXC_INST_PAGE_FAULT);
hedeleg |= (1UL << EXC_LOAD_PAGE_FAULT);
hedeleg |= (1UL << EXC_STORE_PAGE_FAULT);
csr_write(CSR_HEDELEG, hedeleg);
hideleg = 0;
hideleg |= (1UL << IRQ_VS_SOFT);
hideleg |= (1UL << IRQ_VS_TIMER);
hideleg |= (1UL << IRQ_VS_EXT);
csr_write(CSR_HIDELEG, hideleg);
/* VS should access only the time counter directly. Everything else should trap */
csr_write(CSR_HCOUNTEREN, 0x02);
csr_write(CSR_HVIP, 0);
kvm_riscv_aia_enable();
return 0;
}
void kvm_arch_hardware_disable(void)
{
kvm_riscv_aia_disable();
/*
* After clearing the hideleg CSR, the host kernel will receive
* spurious interrupts if hvip CSR has pending interrupts and the
* corresponding enable bits in vsie CSR are asserted. To avoid it,
* hvip CSR and vsie CSR must be cleared before clearing hideleg CSR.
*/
csr_write(CSR_VSIE, 0);
csr_write(CSR_HVIP, 0);
csr_write(CSR_HEDELEG, 0);
csr_write(CSR_HIDELEG, 0);
}
static int __init riscv_kvm_init(void)
{
int rc;
const char *str;
if (!riscv_isa_extension_available(NULL, h)) {
kvm_info("hypervisor extension not available\n");
return -ENODEV;
}
if (sbi_spec_is_0_1()) {
kvm_info("require SBI v0.2 or higher\n");
return -ENODEV;
}
if (!sbi_probe_extension(SBI_EXT_RFENCE)) {
kvm_info("require SBI RFENCE extension\n");
return -ENODEV;
}
kvm_riscv_gstage_mode_detect();
kvm_riscv_gstage_vmid_detect();
rc = kvm_riscv_aia_init();
if (rc && rc != -ENODEV)
return rc;
kvm_info("hypervisor extension available\n");
switch (kvm_riscv_gstage_mode()) {
case HGATP_MODE_SV32X4:
str = "Sv32x4";
break;
case HGATP_MODE_SV39X4:
str = "Sv39x4";
break;
case HGATP_MODE_SV48X4:
str = "Sv48x4";
break;
case HGATP_MODE_SV57X4:
str = "Sv57x4";
break;
default:
return -ENODEV;
}
kvm_info("using %s G-stage page table format\n", str);
kvm_info("VMID %ld bits available\n", kvm_riscv_gstage_vmid_bits());
if (kvm_riscv_aia_available())
kvm_info("AIA available with %d guest external interrupts\n",
kvm_riscv_aia_nr_hgei);
rc = kvm_init(sizeof(struct kvm_vcpu), 0, THIS_MODULE);
if (rc) {
kvm_riscv_aia_exit();
return rc;
}
return 0;
}
module_init(riscv_kvm_init);
static void __exit riscv_kvm_exit(void)
{
kvm_riscv_aia_exit();
kvm_exit();
}
module_exit(riscv_kvm_exit);
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