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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/sbi.h>
#include <asm/kvm_vcpu_timer.h>
#include <asm/kvm_vcpu_sbi.h>
static int kvm_sbi_ext_v01_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
struct kvm_vcpu_sbi_return *retdata)
{
ulong hmask;
int i, ret = 0;
u64 next_cycle;
struct kvm_vcpu *rvcpu;
struct kvm *kvm = vcpu->kvm;
struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
struct kvm_cpu_trap *utrap = retdata->utrap;
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);
retdata->uexit = 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_riscv_vcpu_sbi_system_reset(vcpu, run,
KVM_SYSTEM_EVENT_SHUTDOWN, 0);
retdata->uexit = 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;
if (cp->a7 == SBI_EXT_0_1_REMOTE_FENCE_I)
kvm_riscv_fence_i(vcpu->kvm, 0, hmask);
else if (cp->a7 == SBI_EXT_0_1_REMOTE_SFENCE_VMA) {
if (cp->a1 == 0 && cp->a2 == 0)
kvm_riscv_hfence_vvma_all(vcpu->kvm,
0, hmask);
else
kvm_riscv_hfence_vvma_gva(vcpu->kvm,
0, hmask,
cp->a1, cp->a2,
PAGE_SHIFT);
} else {
if (cp->a1 == 0 && cp->a2 == 0)
kvm_riscv_hfence_vvma_asid_all(vcpu->kvm,
0, hmask,
cp->a3);
else
kvm_riscv_hfence_vvma_asid_gva(vcpu->kvm,
0, hmask,
cp->a1, cp->a2,
PAGE_SHIFT,
cp->a3);
}
break;
default:
retdata->err_val = SBI_ERR_NOT_SUPPORTED;
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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