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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>
119 lines
2.8 KiB
C
119 lines
2.8 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_sbi.h>
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static int kvm_sbi_hsm_vcpu_start(struct kvm_vcpu *vcpu)
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{
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struct kvm_cpu_context *reset_cntx;
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struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
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struct kvm_vcpu *target_vcpu;
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unsigned long target_vcpuid = cp->a0;
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target_vcpu = kvm_get_vcpu_by_id(vcpu->kvm, target_vcpuid);
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if (!target_vcpu)
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return SBI_ERR_INVALID_PARAM;
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if (!target_vcpu->arch.power_off)
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return SBI_ERR_ALREADY_AVAILABLE;
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reset_cntx = &target_vcpu->arch.guest_reset_context;
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/* start address */
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reset_cntx->sepc = cp->a1;
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/* target vcpu id to start */
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reset_cntx->a0 = target_vcpuid;
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/* private data passed from kernel */
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reset_cntx->a1 = cp->a2;
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kvm_make_request(KVM_REQ_VCPU_RESET, target_vcpu);
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kvm_riscv_vcpu_power_on(target_vcpu);
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return 0;
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}
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static int kvm_sbi_hsm_vcpu_stop(struct kvm_vcpu *vcpu)
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{
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if (vcpu->arch.power_off)
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return SBI_ERR_FAILURE;
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kvm_riscv_vcpu_power_off(vcpu);
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return 0;
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}
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static int kvm_sbi_hsm_vcpu_get_status(struct kvm_vcpu *vcpu)
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{
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struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
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unsigned long target_vcpuid = cp->a0;
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struct kvm_vcpu *target_vcpu;
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target_vcpu = kvm_get_vcpu_by_id(vcpu->kvm, target_vcpuid);
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if (!target_vcpu)
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return SBI_ERR_INVALID_PARAM;
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if (!target_vcpu->arch.power_off)
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return SBI_HSM_STATE_STARTED;
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else if (vcpu->stat.generic.blocking)
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return SBI_HSM_STATE_SUSPENDED;
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else
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return SBI_HSM_STATE_STOPPED;
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}
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static int kvm_sbi_ext_hsm_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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int ret = 0;
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struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
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struct kvm *kvm = vcpu->kvm;
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unsigned long funcid = cp->a6;
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switch (funcid) {
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case SBI_EXT_HSM_HART_START:
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mutex_lock(&kvm->lock);
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ret = kvm_sbi_hsm_vcpu_start(vcpu);
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mutex_unlock(&kvm->lock);
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break;
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case SBI_EXT_HSM_HART_STOP:
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ret = kvm_sbi_hsm_vcpu_stop(vcpu);
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break;
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case SBI_EXT_HSM_HART_STATUS:
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ret = kvm_sbi_hsm_vcpu_get_status(vcpu);
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if (ret >= 0) {
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retdata->out_val = ret;
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retdata->err_val = 0;
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}
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return 0;
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case SBI_EXT_HSM_HART_SUSPEND:
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switch (cp->a0) {
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case SBI_HSM_SUSPEND_RET_DEFAULT:
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kvm_riscv_vcpu_wfi(vcpu);
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break;
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case SBI_HSM_SUSPEND_NON_RET_DEFAULT:
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ret = SBI_ERR_NOT_SUPPORTED;
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break;
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default:
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ret = SBI_ERR_INVALID_PARAM;
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}
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break;
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default:
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ret = SBI_ERR_NOT_SUPPORTED;
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}
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retdata->err_val = ret;
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return 0;
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}
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const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_hsm = {
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.extid_start = SBI_EXT_HSM,
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.extid_end = SBI_EXT_HSM,
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.handler = kvm_sbi_ext_hsm_handler,
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};
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