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26fb751ca3
Currently, SBI APIs accept a hartmask that is generated from struct cpumask. Cpumask data structure can hold upto NR_CPUs value. Thus, it is not the correct data structure for hartids as it can be higher than NR_CPUs for platforms with sparse or discontguous hartids. Remove all association between hartid mask and struct cpumask. Reviewed-by: Anup Patel <anup@brainfault.org> (For Linux RISC-V changes) Acked-by: Anup Patel <anup@brainfault.org> (For KVM RISC-V changes) Signed-off-by: Atish Patra <atishp@rivosinc.com> Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
123 lines
3.1 KiB
C
123 lines
3.1 KiB
C
// 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 <atish.patra@wdc.com>
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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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