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023c15151f
Implement a KVM SBI SUSP extension handler. The handler only validates the system suspend entry criteria and prepares for resuming in the appropriate state at the resume_addr (as specified by the SBI spec), but then it forwards the call to the VMM where any system suspend behavior may be implemented. Since VMM support is needed, KVM disables the extension by default. Signed-off-by: Andrew Jones <ajones@ventanamicro.com> Reviewed-by: Anup Patel <anup@brainfault.org> Link: https://lore.kernel.org/r/20241017074538.18867-5-ajones@ventanamicro.com Signed-off-by: Anup Patel <anup@brainfault.org>
97 lines
3.3 KiB
C
97 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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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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#ifndef __RISCV_KVM_VCPU_SBI_H__
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#define __RISCV_KVM_VCPU_SBI_H__
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#define KVM_SBI_IMPID 3
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#define KVM_SBI_VERSION_MAJOR 2
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#define KVM_SBI_VERSION_MINOR 0
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enum kvm_riscv_sbi_ext_status {
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KVM_RISCV_SBI_EXT_STATUS_UNINITIALIZED,
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KVM_RISCV_SBI_EXT_STATUS_UNAVAILABLE,
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KVM_RISCV_SBI_EXT_STATUS_ENABLED,
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KVM_RISCV_SBI_EXT_STATUS_DISABLED,
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};
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struct kvm_vcpu_sbi_context {
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int return_handled;
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enum kvm_riscv_sbi_ext_status ext_status[KVM_RISCV_SBI_EXT_MAX];
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};
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struct kvm_vcpu_sbi_return {
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unsigned long out_val;
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unsigned long err_val;
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struct kvm_cpu_trap *utrap;
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bool uexit;
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};
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struct kvm_vcpu_sbi_extension {
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unsigned long extid_start;
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unsigned long extid_end;
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bool default_disabled;
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/**
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* SBI extension handler. It can be defined for a given extension or group of
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* extension. But it should always return linux error codes rather than SBI
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* specific error codes.
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*/
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int (*handler)(struct kvm_vcpu *vcpu, struct kvm_run *run,
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struct kvm_vcpu_sbi_return *retdata);
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/* Extension specific probe function */
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unsigned long (*probe)(struct kvm_vcpu *vcpu);
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};
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void kvm_riscv_vcpu_sbi_forward(struct kvm_vcpu *vcpu, struct kvm_run *run);
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void kvm_riscv_vcpu_sbi_system_reset(struct kvm_vcpu *vcpu,
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struct kvm_run *run,
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u32 type, u64 flags);
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int kvm_riscv_vcpu_sbi_return(struct kvm_vcpu *vcpu, struct kvm_run *run);
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int kvm_riscv_vcpu_set_reg_sbi_ext(struct kvm_vcpu *vcpu,
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const struct kvm_one_reg *reg);
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int kvm_riscv_vcpu_get_reg_sbi_ext(struct kvm_vcpu *vcpu,
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const struct kvm_one_reg *reg);
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int kvm_riscv_vcpu_set_reg_sbi(struct kvm_vcpu *vcpu,
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const struct kvm_one_reg *reg);
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int kvm_riscv_vcpu_get_reg_sbi(struct kvm_vcpu *vcpu,
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const struct kvm_one_reg *reg);
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const struct kvm_vcpu_sbi_extension *kvm_vcpu_sbi_find_ext(
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struct kvm_vcpu *vcpu, unsigned long extid);
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bool riscv_vcpu_supports_sbi_ext(struct kvm_vcpu *vcpu, int idx);
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int kvm_riscv_vcpu_sbi_ecall(struct kvm_vcpu *vcpu, struct kvm_run *run);
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void kvm_riscv_vcpu_sbi_init(struct kvm_vcpu *vcpu);
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int kvm_riscv_vcpu_get_reg_sbi_sta(struct kvm_vcpu *vcpu, unsigned long reg_num,
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unsigned long *reg_val);
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int kvm_riscv_vcpu_set_reg_sbi_sta(struct kvm_vcpu *vcpu, unsigned long reg_num,
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unsigned long reg_val);
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#ifdef CONFIG_RISCV_SBI_V01
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extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_v01;
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#endif
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extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_base;
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extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_time;
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extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_ipi;
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extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_rfence;
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extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_srst;
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extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_hsm;
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extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_dbcn;
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extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_susp;
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extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_sta;
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extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_experimental;
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extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_vendor;
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#ifdef CONFIG_RISCV_PMU_SBI
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extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_pmu;
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#endif
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#endif /* __RISCV_KVM_VCPU_SBI_H__ */
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