// 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/hwcap.h> #include <asm/sbi.h> long kvm_arch_dev_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { return -EINVAL; } int kvm_arch_check_processor_compat(void *opaque) { return 0; } int kvm_arch_hardware_setup(void *opaque) { return 0; } 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); csr_write(CSR_HCOUNTEREN, -1UL); csr_write(CSR_HVIP, 0); return 0; } void kvm_arch_hardware_disable(void) { /* * 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); } int kvm_arch_init(void *opaque) { 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) <= 0) { kvm_info("require SBI RFENCE extension\n"); return -ENODEV; } kvm_riscv_gstage_mode_detect(); kvm_riscv_gstage_vmid_detect(); 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()); return 0; } void kvm_arch_exit(void) { } static int __init riscv_kvm_init(void) { return kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE); } module_init(riscv_kvm_init); static void __exit riscv_kvm_exit(void) { kvm_exit(); } module_exit(riscv_kvm_exit);