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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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bae0dfd74e
Currently, the SBI extension handle is expected to return Linux error code. The top SBI layer converts the Linux error code to SBI specific error code that can be returned to guest invoking the SBI calls. This model works as long as SBI error codes have 1-to-1 mappings between them. However, that may not be true always. This patch attempts to disassociate both these error codes by allowing the SBI extension implementation to return SBI specific error codes as well. The extension will continue to return the Linux error specific code which will indicate any problem *with* the extension emulation while the SBI specific error will indicate the problem *of* the emulation. Reviewed-by: Anup Patel <anup@brainfault.org> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Suggested-by: Andrew Jones <ajones@ventanamicro.com> Signed-off-by: Atish Patra <atishp@rivosinc.com> Signed-off-by: Anup Patel <anup@brainfault.org>
114 lines
2.9 KiB
C
114 lines
2.9 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/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 int kvm_sbi_ext_v01_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
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struct kvm_vcpu_sbi_return *retdata)
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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 kvm *kvm = vcpu->kvm;
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struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
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struct kvm_cpu_trap *utrap = retdata->utrap;
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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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retdata->uexit = 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, 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_riscv_vcpu_sbi_system_reset(vcpu, run,
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KVM_SYSTEM_EVENT_SHUTDOWN, 0);
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retdata->uexit = 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, 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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if (cp->a7 == SBI_EXT_0_1_REMOTE_FENCE_I)
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kvm_riscv_fence_i(vcpu->kvm, 0, hmask);
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else if (cp->a7 == SBI_EXT_0_1_REMOTE_SFENCE_VMA) {
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if (cp->a1 == 0 && cp->a2 == 0)
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kvm_riscv_hfence_vvma_all(vcpu->kvm,
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0, hmask);
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else
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kvm_riscv_hfence_vvma_gva(vcpu->kvm,
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0, hmask,
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cp->a1, cp->a2,
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PAGE_SHIFT);
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} else {
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if (cp->a1 == 0 && cp->a2 == 0)
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kvm_riscv_hfence_vvma_asid_all(vcpu->kvm,
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0, hmask,
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cp->a3);
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else
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kvm_riscv_hfence_vvma_asid_gva(vcpu->kvm,
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0, hmask,
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cp->a1, cp->a2,
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PAGE_SHIFT,
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cp->a3);
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}
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break;
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default:
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retdata->err_val = SBI_ERR_NOT_SUPPORTED;
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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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