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VHE systems don't have to emulate the physical timer, we can simply assign the EL1 physical timer directly to the VM as the host always uses the EL2 timers. In order to minimize the amount of cruft, AArch32 gets definitions for the physical timer too, but is should be generally unused on this architecture. Co-written with Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@arm.com>
122 lines
3.5 KiB
C
122 lines
3.5 KiB
C
/*
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* Copyright (C) 2012 ARM Ltd.
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* Author: Marc Zyngier <marc.zyngier@arm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __ASM_ARM_KVM_ARCH_TIMER_H
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#define __ASM_ARM_KVM_ARCH_TIMER_H
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#include <linux/clocksource.h>
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#include <linux/hrtimer.h>
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enum kvm_arch_timers {
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TIMER_PTIMER,
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TIMER_VTIMER,
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NR_KVM_TIMERS
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};
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enum kvm_arch_timer_regs {
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TIMER_REG_CNT,
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TIMER_REG_CVAL,
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TIMER_REG_TVAL,
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TIMER_REG_CTL,
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};
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struct arch_timer_context {
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struct kvm_vcpu *vcpu;
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/* Registers: control register, timer value */
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u32 cnt_ctl;
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u64 cnt_cval;
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/* Timer IRQ */
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struct kvm_irq_level irq;
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/* Virtual offset */
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u64 cntvoff;
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/* Emulated Timer (may be unused) */
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struct hrtimer hrtimer;
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/* Duplicated state from arch_timer.c for convenience */
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u32 host_timer_irq;
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u32 host_timer_irq_flags;
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};
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struct arch_timer_cpu {
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struct arch_timer_context timers[NR_KVM_TIMERS];
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/* Background timer used when the guest is not running */
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struct hrtimer bg_timer;
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/* Is the timer enabled */
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bool enabled;
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/*
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* We have multiple paths which can save/restore the timer state
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* onto the hardware, so we need some way of keeping track of
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* where the latest state is.
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*
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* loaded == true: State is loaded on the hardware registers.
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* loaded == false: State is stored in memory.
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*/
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bool loaded;
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};
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int kvm_timer_hyp_init(bool);
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int kvm_timer_enable(struct kvm_vcpu *vcpu);
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int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu);
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void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu);
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void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu);
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bool kvm_timer_should_notify_user(struct kvm_vcpu *vcpu);
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void kvm_timer_update_run(struct kvm_vcpu *vcpu);
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void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu);
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u64 kvm_arm_timer_get_reg(struct kvm_vcpu *, u64 regid);
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int kvm_arm_timer_set_reg(struct kvm_vcpu *, u64 regid, u64 value);
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int kvm_arm_timer_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
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int kvm_arm_timer_get_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
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int kvm_arm_timer_has_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
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bool kvm_timer_is_pending(struct kvm_vcpu *vcpu);
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u64 kvm_phys_timer_read(void);
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void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu);
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void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu);
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void kvm_timer_init_vhe(void);
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bool kvm_arch_timer_get_input_level(int vintid);
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#define vcpu_timer(v) (&(v)->arch.timer_cpu)
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#define vcpu_get_timer(v,t) (&vcpu_timer(v)->timers[(t)])
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#define vcpu_vtimer(v) (&(v)->arch.timer_cpu.timers[TIMER_VTIMER])
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#define vcpu_ptimer(v) (&(v)->arch.timer_cpu.timers[TIMER_PTIMER])
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#define arch_timer_ctx_index(ctx) ((ctx) - vcpu_timer((ctx)->vcpu)->timers)
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u64 kvm_arm_timer_read_sysreg(struct kvm_vcpu *vcpu,
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enum kvm_arch_timers tmr,
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enum kvm_arch_timer_regs treg);
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void kvm_arm_timer_write_sysreg(struct kvm_vcpu *vcpu,
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enum kvm_arch_timers tmr,
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enum kvm_arch_timer_regs treg,
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u64 val);
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#endif
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