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