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123 lines
3.1 KiB
123 lines
3.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (c) 2021 Western Digital Corporation or its affiliates. |
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* |
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* Authors: |
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* Atish Patra <[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/kvm_host.h> |
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#include <asm/csr.h> |
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#include <asm/sbi.h> |
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#include <asm/kvm_vcpu_timer.h> |
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#include <asm/kvm_vcpu_sbi.h> |
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static void kvm_sbi_system_shutdown(struct kvm_vcpu *vcpu, |
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struct kvm_run *run, u32 type) |
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{ |
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unsigned long i; |
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struct kvm_vcpu *tmp; |
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kvm_for_each_vcpu(i, tmp, vcpu->kvm) |
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tmp->arch.power_off = true; |
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kvm_make_all_cpus_request(vcpu->kvm, KVM_REQ_SLEEP); |
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memset(&run->system_event, 0, sizeof(run->system_event)); |
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run->system_event.type = type; |
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run->exit_reason = KVM_EXIT_SYSTEM_EVENT; |
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} |
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static int kvm_sbi_ext_v01_handler(struct kvm_vcpu *vcpu, struct kvm_run *run, |
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unsigned long *out_val, |
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struct kvm_cpu_trap *utrap, |
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bool *exit) |
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{ |
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ulong hmask; |
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int i, ret = 0; |
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u64 next_cycle; |
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struct kvm_vcpu *rvcpu; |
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struct cpumask cm; |
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struct kvm *kvm = vcpu->kvm; |
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struct kvm_cpu_context *cp = &vcpu->arch.guest_context; |
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switch (cp->a7) { |
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case SBI_EXT_0_1_CONSOLE_GETCHAR: |
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case SBI_EXT_0_1_CONSOLE_PUTCHAR: |
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/* |
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* The CONSOLE_GETCHAR/CONSOLE_PUTCHAR SBI calls cannot be |
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* handled in kernel so we forward these to user-space |
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*/ |
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kvm_riscv_vcpu_sbi_forward(vcpu, run); |
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*exit = true; |
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break; |
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case SBI_EXT_0_1_SET_TIMER: |
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#if __riscv_xlen == 32 |
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next_cycle = ((u64)cp->a1 << 32) | (u64)cp->a0; |
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#else |
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next_cycle = (u64)cp->a0; |
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#endif |
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ret = kvm_riscv_vcpu_timer_next_event(vcpu, next_cycle); |
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break; |
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case SBI_EXT_0_1_CLEAR_IPI: |
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ret = kvm_riscv_vcpu_unset_interrupt(vcpu, IRQ_VS_SOFT); |
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break; |
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case SBI_EXT_0_1_SEND_IPI: |
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if (cp->a0) |
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hmask = kvm_riscv_vcpu_unpriv_read(vcpu, false, cp->a0, |
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utrap); |
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else |
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hmask = (1UL << atomic_read(&kvm->online_vcpus)) - 1; |
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if (utrap->scause) |
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break; |
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for_each_set_bit(i, &hmask, BITS_PER_LONG) { |
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rvcpu = kvm_get_vcpu_by_id(vcpu->kvm, i); |
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ret = kvm_riscv_vcpu_set_interrupt(rvcpu, IRQ_VS_SOFT); |
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if (ret < 0) |
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break; |
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} |
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break; |
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case SBI_EXT_0_1_SHUTDOWN: |
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kvm_sbi_system_shutdown(vcpu, run, KVM_SYSTEM_EVENT_SHUTDOWN); |
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*exit = true; |
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break; |
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case SBI_EXT_0_1_REMOTE_FENCE_I: |
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case SBI_EXT_0_1_REMOTE_SFENCE_VMA: |
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case SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID: |
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if (cp->a0) |
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hmask = kvm_riscv_vcpu_unpriv_read(vcpu, false, cp->a0, |
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utrap); |
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else |
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hmask = (1UL << atomic_read(&kvm->online_vcpus)) - 1; |
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if (utrap->scause) |
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break; |
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cpumask_clear(&cm); |
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for_each_set_bit(i, &hmask, BITS_PER_LONG) { |
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rvcpu = kvm_get_vcpu_by_id(vcpu->kvm, i); |
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if (rvcpu->cpu < 0) |
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continue; |
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cpumask_set_cpu(rvcpu->cpu, &cm); |
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} |
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if (cp->a7 == SBI_EXT_0_1_REMOTE_FENCE_I) |
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ret = sbi_remote_fence_i(&cm); |
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else if (cp->a7 == SBI_EXT_0_1_REMOTE_SFENCE_VMA) |
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ret = sbi_remote_hfence_vvma(&cm, cp->a1, cp->a2); |
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else |
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ret = sbi_remote_hfence_vvma_asid(&cm, cp->a1, cp->a2, cp->a3); |
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break; |
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default: |
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ret = -EINVAL; |
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break; |
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}; |
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return ret; |
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} |
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const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_v01 = { |
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.extid_start = SBI_EXT_0_1_SET_TIMER, |
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.extid_end = SBI_EXT_0_1_SHUTDOWN, |
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.handler = kvm_sbi_ext_v01_handler, |
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};
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