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126 lines
2.5 KiB
126 lines
2.5 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2019 Western Digital Corporation or its affiliates. |
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* |
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* Authors: |
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* Anup Patel <[email protected]> |
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*/ |
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#include <linux/errno.h> |
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#include <linux/err.h> |
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#include <linux/module.h> |
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#include <linux/kvm_host.h> |
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#include <asm/csr.h> |
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#include <asm/hwcap.h> |
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#include <asm/sbi.h> |
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long kvm_arch_dev_ioctl(struct file *filp, |
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unsigned int ioctl, unsigned long arg) |
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{ |
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return -EINVAL; |
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} |
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int kvm_arch_check_processor_compat(void *opaque) |
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{ |
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return 0; |
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} |
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int kvm_arch_hardware_setup(void *opaque) |
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{ |
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return 0; |
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} |
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int kvm_arch_hardware_enable(void) |
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{ |
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unsigned long hideleg, hedeleg; |
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hedeleg = 0; |
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hedeleg |= (1UL << EXC_INST_MISALIGNED); |
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hedeleg |= (1UL << EXC_BREAKPOINT); |
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hedeleg |= (1UL << EXC_SYSCALL); |
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hedeleg |= (1UL << EXC_INST_PAGE_FAULT); |
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hedeleg |= (1UL << EXC_LOAD_PAGE_FAULT); |
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hedeleg |= (1UL << EXC_STORE_PAGE_FAULT); |
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csr_write(CSR_HEDELEG, hedeleg); |
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hideleg = 0; |
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hideleg |= (1UL << IRQ_VS_SOFT); |
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hideleg |= (1UL << IRQ_VS_TIMER); |
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hideleg |= (1UL << IRQ_VS_EXT); |
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csr_write(CSR_HIDELEG, hideleg); |
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csr_write(CSR_HCOUNTEREN, -1UL); |
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csr_write(CSR_HVIP, 0); |
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return 0; |
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} |
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void kvm_arch_hardware_disable(void) |
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{ |
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/* |
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* After clearing the hideleg CSR, the host kernel will receive |
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* spurious interrupts if hvip CSR has pending interrupts and the |
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* corresponding enable bits in vsie CSR are asserted. To avoid it, |
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* hvip CSR and vsie CSR must be cleared before clearing hideleg CSR. |
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*/ |
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csr_write(CSR_VSIE, 0); |
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csr_write(CSR_HVIP, 0); |
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csr_write(CSR_HEDELEG, 0); |
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csr_write(CSR_HIDELEG, 0); |
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} |
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int kvm_arch_init(void *opaque) |
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{ |
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const char *str; |
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if (!riscv_isa_extension_available(NULL, h)) { |
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kvm_info("hypervisor extension not available\n"); |
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return -ENODEV; |
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} |
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if (sbi_spec_is_0_1()) { |
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kvm_info("require SBI v0.2 or higher\n"); |
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return -ENODEV; |
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} |
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if (sbi_probe_extension(SBI_EXT_RFENCE) <= 0) { |
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kvm_info("require SBI RFENCE extension\n"); |
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return -ENODEV; |
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} |
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kvm_riscv_stage2_mode_detect(); |
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kvm_riscv_stage2_vmid_detect(); |
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kvm_info("hypervisor extension available\n"); |
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switch (kvm_riscv_stage2_mode()) { |
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case HGATP_MODE_SV32X4: |
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str = "Sv32x4"; |
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break; |
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case HGATP_MODE_SV39X4: |
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str = "Sv39x4"; |
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break; |
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case HGATP_MODE_SV48X4: |
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str = "Sv48x4"; |
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break; |
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default: |
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return -ENODEV; |
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} |
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kvm_info("using %s G-stage page table format\n", str); |
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kvm_info("VMID %ld bits available\n", kvm_riscv_stage2_vmid_bits()); |
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return 0; |
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} |
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void kvm_arch_exit(void) |
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{ |
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} |
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static int riscv_kvm_init(void) |
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{ |
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return kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE); |
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} |
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module_init(riscv_kvm_init);
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