8f5cb44b1b
Sstc extension allows the guest to program the vstimecmp CSR directly instead of making an SBI call to the hypervisor to program the next event. The timer interrupt is also directly injected to the guest by the hardware in this case. To maintain backward compatibility, the hypervisors also update the vstimecmp in an SBI set_time call if the hardware supports it. Thus, the older kernels in guest also take advantage of the sstc extension. Reviewed-by: Anup Patel <anup@brainfault.org> Signed-off-by: Atish Patra <atishp@rivosinc.com> Acked-by: Anup Patel <anup@brainfault.org> Link: https://lore.kernel.org/all/CAAhSdy2mb6wyqy0NAn9BcTWKMYEc0Z4zU3s3j7oNqBz6eDQ9sg@mail.gmail.com/ Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2019 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 __KVM_VCPU_RISCV_TIMER_H
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#define __KVM_VCPU_RISCV_TIMER_H
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#include <linux/hrtimer.h>
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struct kvm_guest_timer {
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/* Mult & Shift values to get nanoseconds from cycles */
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u32 nsec_mult;
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u32 nsec_shift;
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/* Time delta value */
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u64 time_delta;
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};
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struct kvm_vcpu_timer {
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/* Flag for whether init is done */
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bool init_done;
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/* Flag for whether timer event is configured */
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bool next_set;
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/* Next timer event cycles */
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u64 next_cycles;
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/* Underlying hrtimer instance */
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struct hrtimer hrt;
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/* Flag to check if sstc is enabled or not */
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bool sstc_enabled;
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/* A function pointer to switch between stimecmp or hrtimer at runtime */
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int (*timer_next_event)(struct kvm_vcpu *vcpu, u64 ncycles);
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};
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int kvm_riscv_vcpu_timer_next_event(struct kvm_vcpu *vcpu, u64 ncycles);
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int kvm_riscv_vcpu_get_reg_timer(struct kvm_vcpu *vcpu,
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const struct kvm_one_reg *reg);
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int kvm_riscv_vcpu_set_reg_timer(struct kvm_vcpu *vcpu,
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const struct kvm_one_reg *reg);
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int kvm_riscv_vcpu_timer_init(struct kvm_vcpu *vcpu);
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int kvm_riscv_vcpu_timer_deinit(struct kvm_vcpu *vcpu);
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int kvm_riscv_vcpu_timer_reset(struct kvm_vcpu *vcpu);
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void kvm_riscv_vcpu_timer_restore(struct kvm_vcpu *vcpu);
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void kvm_riscv_guest_timer_init(struct kvm *kvm);
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void kvm_riscv_vcpu_timer_save(struct kvm_vcpu *vcpu);
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bool kvm_riscv_vcpu_timer_pending(struct kvm_vcpu *vcpu);
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#endif
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