diff options
Diffstat (limited to 'virt/kvm/arm/arch_timer.c')
| -rw-r--r-- | virt/kvm/arm/arch_timer.c | 1180 |
1 files changed, 0 insertions, 1180 deletions
diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c deleted file mode 100644 index 93bd59b46848..000000000000 --- a/virt/kvm/arm/arch_timer.c +++ /dev/null @@ -1,1180 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * Copyright (C) 2012 ARM Ltd. - * Author: Marc Zyngier <marc.zyngier@arm.com> - */ - -#include <linux/cpu.h> -#include <linux/kvm.h> -#include <linux/kvm_host.h> -#include <linux/interrupt.h> -#include <linux/irq.h> -#include <linux/uaccess.h> - -#include <clocksource/arm_arch_timer.h> -#include <asm/arch_timer.h> -#include <asm/kvm_emulate.h> -#include <asm/kvm_hyp.h> - -#include <kvm/arm_vgic.h> -#include <kvm/arm_arch_timer.h> - -#include "trace.h" - -static struct timecounter *timecounter; -static unsigned int host_vtimer_irq; -static unsigned int host_ptimer_irq; -static u32 host_vtimer_irq_flags; -static u32 host_ptimer_irq_flags; - -static DEFINE_STATIC_KEY_FALSE(has_gic_active_state); - -static const struct kvm_irq_level default_ptimer_irq = { - .irq = 30, - .level = 1, -}; - -static const struct kvm_irq_level default_vtimer_irq = { - .irq = 27, - .level = 1, -}; - -static bool kvm_timer_irq_can_fire(struct arch_timer_context *timer_ctx); -static void kvm_timer_update_irq(struct kvm_vcpu *vcpu, bool new_level, - struct arch_timer_context *timer_ctx); -static bool kvm_timer_should_fire(struct arch_timer_context *timer_ctx); -static void kvm_arm_timer_write(struct kvm_vcpu *vcpu, - struct arch_timer_context *timer, - enum kvm_arch_timer_regs treg, - u64 val); -static u64 kvm_arm_timer_read(struct kvm_vcpu *vcpu, - struct arch_timer_context *timer, - enum kvm_arch_timer_regs treg); - -u64 kvm_phys_timer_read(void) -{ - return timecounter->cc->read(timecounter->cc); -} - -static void get_timer_map(struct kvm_vcpu *vcpu, struct timer_map *map) -{ - if (has_vhe()) { - map->direct_vtimer = vcpu_vtimer(vcpu); - map->direct_ptimer = vcpu_ptimer(vcpu); - map->emul_ptimer = NULL; - } else { - map->direct_vtimer = vcpu_vtimer(vcpu); - map->direct_ptimer = NULL; - map->emul_ptimer = vcpu_ptimer(vcpu); - } - - trace_kvm_get_timer_map(vcpu->vcpu_id, map); -} - -static inline bool userspace_irqchip(struct kvm *kvm) -{ - return static_branch_unlikely(&userspace_irqchip_in_use) && - unlikely(!irqchip_in_kernel(kvm)); -} - -static void soft_timer_start(struct hrtimer *hrt, u64 ns) -{ - hrtimer_start(hrt, ktime_add_ns(ktime_get(), ns), - HRTIMER_MODE_ABS_HARD); -} - -static void soft_timer_cancel(struct hrtimer *hrt) -{ - hrtimer_cancel(hrt); -} - -static irqreturn_t kvm_arch_timer_handler(int irq, void *dev_id) -{ - struct kvm_vcpu *vcpu = *(struct kvm_vcpu **)dev_id; - struct arch_timer_context *ctx; - struct timer_map map; - - /* - * We may see a timer interrupt after vcpu_put() has been called which - * sets the CPU's vcpu pointer to NULL, because even though the timer - * has been disabled in timer_save_state(), the hardware interrupt - * signal may not have been retired from the interrupt controller yet. - */ - if (!vcpu) - return IRQ_HANDLED; - - get_timer_map(vcpu, &map); - - if (irq == host_vtimer_irq) - ctx = map.direct_vtimer; - else - ctx = map.direct_ptimer; - - if (kvm_timer_should_fire(ctx)) - kvm_timer_update_irq(vcpu, true, ctx); - - if (userspace_irqchip(vcpu->kvm) && - !static_branch_unlikely(&has_gic_active_state)) - disable_percpu_irq(host_vtimer_irq); - - return IRQ_HANDLED; -} - -static u64 kvm_timer_compute_delta(struct arch_timer_context *timer_ctx) -{ - u64 cval, now; - - cval = timer_ctx->cnt_cval; - now = kvm_phys_timer_read() - timer_ctx->cntvoff; - - if (now < cval) { - u64 ns; - - ns = cyclecounter_cyc2ns(timecounter->cc, - cval - now, - timecounter->mask, - &timecounter->frac); - return ns; - } - - return 0; -} - -static bool kvm_timer_irq_can_fire(struct arch_timer_context *timer_ctx) -{ - WARN_ON(timer_ctx && timer_ctx->loaded); - return timer_ctx && - !(timer_ctx->cnt_ctl & ARCH_TIMER_CTRL_IT_MASK) && - (timer_ctx->cnt_ctl & ARCH_TIMER_CTRL_ENABLE); -} - -/* - * Returns the earliest expiration time in ns among guest timers. - * Note that it will return 0 if none of timers can fire. - */ -static u64 kvm_timer_earliest_exp(struct kvm_vcpu *vcpu) -{ - u64 min_delta = ULLONG_MAX; - int i; - - for (i = 0; i < NR_KVM_TIMERS; i++) { - struct arch_timer_context *ctx = &vcpu->arch.timer_cpu.timers[i]; - - WARN(ctx->loaded, "timer %d loaded\n", i); - if (kvm_timer_irq_can_fire(ctx)) - min_delta = min(min_delta, kvm_timer_compute_delta(ctx)); - } - - /* If none of timers can fire, then return 0 */ - if (min_delta == ULLONG_MAX) - return 0; - - return min_delta; -} - -static enum hrtimer_restart kvm_bg_timer_expire(struct hrtimer *hrt) -{ - struct arch_timer_cpu *timer; - struct kvm_vcpu *vcpu; - u64 ns; - - timer = container_of(hrt, struct arch_timer_cpu, bg_timer); - vcpu = container_of(timer, struct kvm_vcpu, arch.timer_cpu); - - /* - * Check that the timer has really expired from the guest's - * PoV (NTP on the host may have forced it to expire - * early). If we should have slept longer, restart it. - */ - ns = kvm_timer_earliest_exp(vcpu); - if (unlikely(ns)) { - hrtimer_forward_now(hrt, ns_to_ktime(ns)); - return HRTIMER_RESTART; - } - - kvm_vcpu_wake_up(vcpu); - return HRTIMER_NORESTART; -} - -static enum hrtimer_restart kvm_hrtimer_expire(struct hrtimer *hrt) -{ - struct arch_timer_context *ctx; - struct kvm_vcpu *vcpu; - u64 ns; - - ctx = container_of(hrt, struct arch_timer_context, hrtimer); - vcpu = ctx->vcpu; - - trace_kvm_timer_hrtimer_expire(ctx); - - /* - * Check that the timer has really expired from the guest's - * PoV (NTP on the host may have forced it to expire - * early). If not ready, schedule for a later time. - */ - ns = kvm_timer_compute_delta(ctx); - if (unlikely(ns)) { - hrtimer_forward_now(hrt, ns_to_ktime(ns)); - return HRTIMER_RESTART; - } - - kvm_timer_update_irq(vcpu, true, ctx); - return HRTIMER_NORESTART; -} - -static bool kvm_timer_should_fire(struct arch_timer_context *timer_ctx) -{ - enum kvm_arch_timers index; - u64 cval, now; - - if (!timer_ctx) - return false; - - index = arch_timer_ctx_index(timer_ctx); - - if (timer_ctx->loaded) { - u32 cnt_ctl = 0; - - switch (index) { - case TIMER_VTIMER: - cnt_ctl = read_sysreg_el0(SYS_CNTV_CTL); - break; - case TIMER_PTIMER: - cnt_ctl = read_sysreg_el0(SYS_CNTP_CTL); - break; - case NR_KVM_TIMERS: - /* GCC is braindead */ - cnt_ctl = 0; - break; - } - - return (cnt_ctl & ARCH_TIMER_CTRL_ENABLE) && - (cnt_ctl & ARCH_TIMER_CTRL_IT_STAT) && - !(cnt_ctl & ARCH_TIMER_CTRL_IT_MASK); - } - - if (!kvm_timer_irq_can_fire(timer_ctx)) - return false; - - cval = timer_ctx->cnt_cval; - now = kvm_phys_timer_read() - timer_ctx->cntvoff; - - return cval <= now; -} - -bool kvm_timer_is_pending(struct kvm_vcpu *vcpu) -{ - struct timer_map map; - - get_timer_map(vcpu, &map); - - return kvm_timer_should_fire(map.direct_vtimer) || - kvm_timer_should_fire(map.direct_ptimer) || - kvm_timer_should_fire(map.emul_ptimer); -} - -/* - * Reflect the timer output level into the kvm_run structure - */ -void kvm_timer_update_run(struct kvm_vcpu *vcpu) -{ - struct arch_timer_context *vtimer = vcpu_vtimer(vcpu); - struct arch_timer_context *ptimer = vcpu_ptimer(vcpu); - struct kvm_sync_regs *regs = &vcpu->run->s.regs; - - /* Populate the device bitmap with the timer states */ - regs->device_irq_level &= ~(KVM_ARM_DEV_EL1_VTIMER | - KVM_ARM_DEV_EL1_PTIMER); - if (kvm_timer_should_fire(vtimer)) - regs->device_irq_level |= KVM_ARM_DEV_EL1_VTIMER; - if (kvm_timer_should_fire(ptimer)) - regs->device_irq_level |= KVM_ARM_DEV_EL1_PTIMER; -} - -static void kvm_timer_update_irq(struct kvm_vcpu *vcpu, bool new_level, - struct arch_timer_context *timer_ctx) -{ - int ret; - - timer_ctx->irq.level = new_level; - trace_kvm_timer_update_irq(vcpu->vcpu_id, timer_ctx->irq.irq, - timer_ctx->irq.level); - - if (!userspace_irqchip(vcpu->kvm)) { - ret = kvm_vgic_inject_irq(vcpu->kvm, vcpu->vcpu_id, - timer_ctx->irq.irq, - timer_ctx->irq.level, - timer_ctx); - WARN_ON(ret); - } -} - -/* Only called for a fully emulated timer */ -static void timer_emulate(struct arch_timer_context *ctx) -{ - bool should_fire = kvm_timer_should_fire(ctx); - - trace_kvm_timer_emulate(ctx, should_fire); - - if (should_fire != ctx->irq.level) { - kvm_timer_update_irq(ctx->vcpu, should_fire, ctx); - return; - } - - /* - * If the timer can fire now, we don't need to have a soft timer - * scheduled for the future. If the timer cannot fire at all, - * then we also don't need a soft timer. - */ - if (!kvm_timer_irq_can_fire(ctx)) { - soft_timer_cancel(&ctx->hrtimer); - return; - } - - soft_timer_start(&ctx->hrtimer, kvm_timer_compute_delta(ctx)); -} - -static void timer_save_state(struct arch_timer_context *ctx) -{ - struct arch_timer_cpu *timer = vcpu_timer(ctx->vcpu); - enum kvm_arch_timers index = arch_timer_ctx_index(ctx); - unsigned long flags; - - if (!timer->enabled) - return; - - local_irq_save(flags); - - if (!ctx->loaded) - goto out; - - switch (index) { - case TIMER_VTIMER: - ctx->cnt_ctl = read_sysreg_el0(SYS_CNTV_CTL); - ctx->cnt_cval = read_sysreg_el0(SYS_CNTV_CVAL); - - /* Disable the timer */ - write_sysreg_el0(0, SYS_CNTV_CTL); - isb(); - - break; - case TIMER_PTIMER: - ctx->cnt_ctl = read_sysreg_el0(SYS_CNTP_CTL); - ctx->cnt_cval = read_sysreg_el0(SYS_CNTP_CVAL); - - /* Disable the timer */ - write_sysreg_el0(0, SYS_CNTP_CTL); - isb(); - - break; - case NR_KVM_TIMERS: - BUG(); - } - - trace_kvm_timer_save_state(ctx); - - ctx->loaded = false; -out: - local_irq_restore(flags); -} - -/* - * Schedule the background timer before calling kvm_vcpu_block, so that this - * thread is removed from its waitqueue and made runnable when there's a timer - * interrupt to handle. - */ -static void kvm_timer_blocking(struct kvm_vcpu *vcpu) -{ - struct arch_timer_cpu *timer = vcpu_timer(vcpu); - struct timer_map map; - - get_timer_map(vcpu, &map); - - /* - * If no timers are capable of raising interrupts (disabled or - * masked), then there's no more work for us to do. - */ - if (!kvm_timer_irq_can_fire(map.direct_vtimer) && - !kvm_timer_irq_can_fire(map.direct_ptimer) && - !kvm_timer_irq_can_fire(map.emul_ptimer)) - return; - - /* - * At least one guest time will expire. Schedule a background timer. - * Set the earliest expiration time among the guest timers. - */ - soft_timer_start(&timer->bg_timer, kvm_timer_earliest_exp(vcpu)); -} - -static void kvm_timer_unblocking(struct kvm_vcpu *vcpu) -{ - struct arch_timer_cpu *timer = vcpu_timer(vcpu); - - soft_timer_cancel(&timer->bg_timer); -} - -static void timer_restore_state(struct arch_timer_context *ctx) -{ - struct arch_timer_cpu *timer = vcpu_timer(ctx->vcpu); - enum kvm_arch_timers index = arch_timer_ctx_index(ctx); - unsigned long flags; - - if (!timer->enabled) - return; - - local_irq_save(flags); - - if (ctx->loaded) - goto out; - - switch (index) { - case TIMER_VTIMER: - write_sysreg_el0(ctx->cnt_cval, SYS_CNTV_CVAL); - isb(); - write_sysreg_el0(ctx->cnt_ctl, SYS_CNTV_CTL); - break; - case TIMER_PTIMER: - write_sysreg_el0(ctx->cnt_cval, SYS_CNTP_CVAL); - isb(); - write_sysreg_el0(ctx->cnt_ctl, SYS_CNTP_CTL); - break; - case NR_KVM_TIMERS: - BUG(); - } - - trace_kvm_timer_restore_state(ctx); - - ctx->loaded = true; -out: - local_irq_restore(flags); -} - -static void set_cntvoff(u64 cntvoff) -{ - u32 low = lower_32_bits(cntvoff); - u32 high = upper_32_bits(cntvoff); - - /* - * Since kvm_call_hyp doesn't fully support the ARM PCS especially on - * 32-bit systems, but rather passes register by register shifted one - * place (we put the function address in r0/x0), we cannot simply pass - * a 64-bit value as an argument, but have to split the value in two - * 32-bit halves. - */ - kvm_call_hyp(__kvm_timer_set_cntvoff, low, high); -} - -static inline void set_timer_irq_phys_active(struct arch_timer_context *ctx, bool active) -{ - int r; - r = irq_set_irqchip_state(ctx->host_timer_irq, IRQCHIP_STATE_ACTIVE, active); - WARN_ON(r); -} - -static void kvm_timer_vcpu_load_gic(struct arch_timer_context *ctx) -{ - struct kvm_vcpu *vcpu = ctx->vcpu; - bool phys_active = false; - - /* - * Update the timer output so that it is likely to match the - * state we're about to restore. If the timer expires between - * this point and the register restoration, we'll take the - * interrupt anyway. - */ - kvm_timer_update_irq(ctx->vcpu, kvm_timer_should_fire(ctx), ctx); - - if (irqchip_in_kernel(vcpu->kvm)) - phys_active = kvm_vgic_map_is_active(vcpu, ctx->irq.irq); - - phys_active |= ctx->irq.level; - - set_timer_irq_phys_active(ctx, phys_active); -} - -static void kvm_timer_vcpu_load_nogic(struct kvm_vcpu *vcpu) -{ - struct arch_timer_context *vtimer = vcpu_vtimer(vcpu); - - /* - * Update the timer output so that it is likely to match the - * state we're about to restore. If the timer expires between - * this point and the register restoration, we'll take the - * interrupt anyway. - */ - kvm_timer_update_irq(vcpu, kvm_timer_should_fire(vtimer), vtimer); - - /* - * When using a userspace irqchip with the architected timers and a - * host interrupt controller that doesn't support an active state, we - * must still prevent continuously exiting from the guest, and - * therefore mask the physical interrupt by disabling it on the host - * interrupt controller when the virtual level is high, such that the - * guest can make forward progress. Once we detect the output level - * being de-asserted, we unmask the interrupt again so that we exit - * from the guest when the timer fires. - */ - if (vtimer->irq.level) - disable_percpu_irq(host_vtimer_irq); - else - enable_percpu_irq(host_vtimer_irq, host_vtimer_irq_flags); -} - -void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu) -{ - struct arch_timer_cpu *timer = vcpu_timer(vcpu); - struct timer_map map; - - if (unlikely(!timer->enabled)) - return; - - get_timer_map(vcpu, &map); - - if (static_branch_likely(&has_gic_active_state)) { - kvm_timer_vcpu_load_gic(map.direct_vtimer); - if (map.direct_ptimer) - kvm_timer_vcpu_load_gic(map.direct_ptimer); - } else { - kvm_timer_vcpu_load_nogic(vcpu); - } - - set_cntvoff(map.direct_vtimer->cntvoff); - - kvm_timer_unblocking(vcpu); - - timer_restore_state(map.direct_vtimer); - if (map.direct_ptimer) - timer_restore_state(map.direct_ptimer); - - if (map.emul_ptimer) - timer_emulate(map.emul_ptimer); -} - -bool kvm_timer_should_notify_user(struct kvm_vcpu *vcpu) -{ - struct arch_timer_context *vtimer = vcpu_vtimer(vcpu); - struct arch_timer_context *ptimer = vcpu_ptimer(vcpu); - struct kvm_sync_regs *sregs = &vcpu->run->s.regs; - bool vlevel, plevel; - - if (likely(irqchip_in_kernel(vcpu->kvm))) - return false; - - vlevel = sregs->device_irq_level & KVM_ARM_DEV_EL1_VTIMER; - plevel = sregs->device_irq_level & KVM_ARM_DEV_EL1_PTIMER; - - return kvm_timer_should_fire(vtimer) != vlevel || - kvm_timer_should_fire(ptimer) != plevel; -} - -void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu) -{ - struct arch_timer_cpu *timer = vcpu_timer(vcpu); - struct timer_map map; - - if (unlikely(!timer->enabled)) - return; - - get_timer_map(vcpu, &map); - - timer_save_state(map.direct_vtimer); - if (map.direct_ptimer) - timer_save_state(map.direct_ptimer); - - /* - * Cancel soft timer emulation, because the only case where we - * need it after a vcpu_put is in the context of a sleeping VCPU, and - * in that case we already factor in the deadline for the physical - * timer when scheduling the bg_timer. - * - * In any case, we re-schedule the hrtimer for the physical timer when - * coming back to the VCPU thread in kvm_timer_vcpu_load(). - */ - if (map.emul_ptimer) - soft_timer_cancel(&map.emul_ptimer->hrtimer); - - if (swait_active(kvm_arch_vcpu_wq(vcpu))) - kvm_timer_blocking(vcpu); - - /* - * The kernel may decide to run userspace after calling vcpu_put, so - * we reset cntvoff to 0 to ensure a consistent read between user - * accesses to the virtual counter and kernel access to the physical - * counter of non-VHE case. For VHE, the virtual counter uses a fixed - * virtual offset of zero, so no need to zero CNTVOFF_EL2 register. - */ - set_cntvoff(0); -} - -/* - * With a userspace irqchip we have to check if the guest de-asserted the - * timer and if so, unmask the timer irq signal on the host interrupt - * controller to ensure that we see future timer signals. - */ -static void unmask_vtimer_irq_user(struct kvm_vcpu *vcpu) -{ - struct arch_timer_context *vtimer = vcpu_vtimer(vcpu); - - if (!kvm_timer_should_fire(vtimer)) { - kvm_timer_update_irq(vcpu, false, vtimer); - if (static_branch_likely(&has_gic_active_state)) - set_timer_irq_phys_active(vtimer, false); - else - enable_percpu_irq(host_vtimer_irq, host_vtimer_irq_flags); - } -} - -void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu) -{ - struct arch_timer_cpu *timer = vcpu_timer(vcpu); - - if (unlikely(!timer->enabled)) - return; - - if (unlikely(!irqchip_in_kernel(vcpu->kvm))) - unmask_vtimer_irq_user(vcpu); -} - -int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu) -{ - struct arch_timer_cpu *timer = vcpu_timer(vcpu); - struct timer_map map; - - get_timer_map(vcpu, &map); - - /* - * The bits in CNTV_CTL are architecturally reset to UNKNOWN for ARMv8 - * and to 0 for ARMv7. We provide an implementation that always - * resets the timer to be disabled and unmasked and is compliant with - * the ARMv7 architecture. - */ - vcpu_vtimer(vcpu)->cnt_ctl = 0; - vcpu_ptimer(vcpu)->cnt_ctl = 0; - - if (timer->enabled) { - kvm_timer_update_irq(vcpu, false, vcpu_vtimer(vcpu)); - kvm_timer_update_irq(vcpu, false, vcpu_ptimer(vcpu)); - - if (irqchip_in_kernel(vcpu->kvm)) { - kvm_vgic_reset_mapped_irq(vcpu, map.direct_vtimer->irq.irq); - if (map.direct_ptimer) - kvm_vgic_reset_mapped_irq(vcpu, map.direct_ptimer->irq.irq); - } - } - - if (map.emul_ptimer) - soft_timer_cancel(&map.emul_ptimer->hrtimer); - - return 0; -} - -/* Make the updates of cntvoff for all vtimer contexts atomic */ -static void update_vtimer_cntvoff(struct kvm_vcpu *vcpu, u64 cntvoff) -{ - int i; - struct kvm *kvm = vcpu->kvm; - struct kvm_vcpu *tmp; - - mutex_lock(&kvm->lock); - kvm_for_each_vcpu(i, tmp, kvm) - vcpu_vtimer(tmp)->cntvoff = cntvoff; - - /* - * When called from the vcpu create path, the CPU being created is not - * included in the loop above, so we just set it here as well. - */ - vcpu_vtimer(vcpu)->cntvoff = cntvoff; - mutex_unlock(&kvm->lock); -} - -void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu) -{ - struct arch_timer_cpu *timer = vcpu_timer(vcpu); - struct arch_timer_context *vtimer = vcpu_vtimer(vcpu); - struct arch_timer_context *ptimer = vcpu_ptimer(vcpu); - - /* Synchronize cntvoff across all vtimers of a VM. */ - update_vtimer_cntvoff(vcpu, kvm_phys_timer_read()); - ptimer->cntvoff = 0; - - hrtimer_init(&timer->bg_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_HARD); - timer->bg_timer.function = kvm_bg_timer_expire; - - hrtimer_init(&vtimer->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_HARD); - hrtimer_init(&ptimer->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_HARD); - vtimer->hrtimer.function = kvm_hrtimer_expire; - ptimer->hrtimer.function = kvm_hrtimer_expire; - - vtimer->irq.irq = default_vtimer_irq.irq; - ptimer->irq.irq = default_ptimer_irq.irq; - - vtimer->host_timer_irq = host_vtimer_irq; - ptimer->host_timer_irq = host_ptimer_irq; - - vtimer->host_timer_irq_flags = host_vtimer_irq_flags; - ptimer->host_timer_irq_flags = host_ptimer_irq_flags; - - vtimer->vcpu = vcpu; - ptimer->vcpu = vcpu; -} - -static void kvm_timer_init_interrupt(void *info) -{ - enable_percpu_irq(host_vtimer_irq, host_vtimer_irq_flags); - enable_percpu_irq(host_ptimer_irq, host_ptimer_irq_flags); -} - -int kvm_arm_timer_set_reg(struct kvm_vcpu *vcpu, u64 regid, u64 value) -{ - struct arch_timer_context *timer; - - switch (regid) { - case KVM_REG_ARM_TIMER_CTL: - timer = vcpu_vtimer(vcpu); - kvm_arm_timer_write(vcpu, timer, TIMER_REG_CTL, value); - break; - case KVM_REG_ARM_TIMER_CNT: - timer = vcpu_vtimer(vcpu); - update_vtimer_cntvoff(vcpu, kvm_phys_timer_read() - value); - break; - case KVM_REG_ARM_TIMER_CVAL: - timer = vcpu_vtimer(vcpu); - kvm_arm_timer_write(vcpu, timer, TIMER_REG_CVAL, value); - break; - case KVM_REG_ARM_PTIMER_CTL: - timer = vcpu_ptimer(vcpu); - kvm_arm_timer_write(vcpu, timer, TIMER_REG_CTL, value); - break; - case KVM_REG_ARM_PTIMER_CVAL: - timer = vcpu_ptimer(vcpu); - kvm_arm_timer_write(vcpu, timer, TIMER_REG_CVAL, value); - break; - - default: - return -1; - } - - return 0; -} - -static u64 read_timer_ctl(struct arch_timer_context *timer) -{ - /* - * Set ISTATUS bit if it's expired. - * Note that according to ARMv8 ARM Issue A.k, ISTATUS bit is - * UNKNOWN when ENABLE bit is 0, so we chose to set ISTATUS bit - * regardless of ENABLE bit for our implementation convenience. - */ - if (!kvm_timer_compute_delta(timer)) - return timer->cnt_ctl | ARCH_TIMER_CTRL_IT_STAT; - else - return timer->cnt_ctl; -} - -u64 kvm_arm_timer_get_reg(struct kvm_vcpu *vcpu, u64 regid) -{ - switch (regid) { - case KVM_REG_ARM_TIMER_CTL: - return kvm_arm_timer_read(vcpu, - vcpu_vtimer(vcpu), TIMER_REG_CTL); - case KVM_REG_ARM_TIMER_CNT: - return kvm_arm_timer_read(vcpu, - vcpu_vtimer(vcpu), TIMER_REG_CNT); - case KVM_REG_ARM_TIMER_CVAL: - return kvm_arm_timer_read(vcpu, - vcpu_vtimer(vcpu), TIMER_REG_CVAL); - case KVM_REG_ARM_PTIMER_CTL: - return kvm_arm_timer_read(vcpu, - vcpu_ptimer(vcpu), TIMER_REG_CTL); - case KVM_REG_ARM_PTIMER_CNT: - return kvm_arm_timer_read(vcpu, - vcpu_ptimer(vcpu), TIMER_REG_CNT); - case KVM_REG_ARM_PTIMER_CVAL: - return kvm_arm_timer_read(vcpu, - vcpu_ptimer(vcpu), TIMER_REG_CVAL); - } - return (u64)-1; -} - -static u64 kvm_arm_timer_read(struct kvm_vcpu *vcpu, - struct arch_timer_context *timer, - enum kvm_arch_timer_regs treg) -{ - u64 val; - - switch (treg) { - case TIMER_REG_TVAL: - val = timer->cnt_cval - kvm_phys_timer_read() + timer->cntvoff; - val &= lower_32_bits(val); - break; - - case TIMER_REG_CTL: - val = read_timer_ctl(timer); - break; - - case TIMER_REG_CVAL: - val = timer->cnt_cval; - break; - - case TIMER_REG_CNT: - val = kvm_phys_timer_read() - timer->cntvoff; - break; - - default: - BUG(); - } - - return val; -} - -u64 kvm_arm_timer_read_sysreg(struct kvm_vcpu *vcpu, - enum kvm_arch_timers tmr, - enum kvm_arch_timer_regs treg) -{ - u64 val; - - preempt_disable(); - kvm_timer_vcpu_put(vcpu); - - val = kvm_arm_timer_read(vcpu, vcpu_get_timer(vcpu, tmr), treg); - - kvm_timer_vcpu_load(vcpu); - preempt_enable(); - - return val; -} - -static void kvm_arm_timer_write(struct kvm_vcpu *vcpu, - struct arch_timer_context *timer, - enum kvm_arch_timer_regs treg, - u64 val) -{ - switch (treg) { - case TIMER_REG_TVAL: - timer->cnt_cval = kvm_phys_timer_read() - timer->cntvoff + (s32)val; - break; - - case TIMER_REG_CTL: - timer->cnt_ctl = val & ~ARCH_TIMER_CTRL_IT_STAT; - break; - - case TIMER_REG_CVAL: - timer->cnt_cval = val; - break; - - default: - BUG(); - } -} - -void kvm_arm_timer_write_sysreg(struct kvm_vcpu *vcpu, - enum kvm_arch_timers tmr, - enum kvm_arch_timer_regs treg, - u64 val) -{ - preempt_disable(); - kvm_timer_vcpu_put(vcpu); - - kvm_arm_timer_write(vcpu, vcpu_get_timer(vcpu, tmr), treg, val); - - kvm_timer_vcpu_load(vcpu); - preempt_enable(); -} - -static int kvm_timer_starting_cpu(unsigned int cpu) -{ - kvm_timer_init_interrupt(NULL); - return 0; -} - -static int kvm_timer_dying_cpu(unsigned int cpu) -{ - disable_percpu_irq(host_vtimer_irq); - return 0; -} - -int kvm_timer_hyp_init(bool has_gic) -{ - struct arch_timer_kvm_info *info; - int err; - - info = arch_timer_get_kvm_info(); - timecounter = &info->timecounter; - - if (!timecounter->cc) { - kvm_err("kvm_arch_timer: uninitialized timecounter\n"); - return -ENODEV; - } - - /* First, do the virtual EL1 timer irq */ - - if (info->virtual_irq <= 0) { - kvm_err("kvm_arch_timer: invalid virtual timer IRQ: %d\n", - info->virtual_irq); - return -ENODEV; - } - host_vtimer_irq = info->virtual_irq; - - host_vtimer_irq_flags = irq_get_trigger_type(host_vtimer_irq); - if (host_vtimer_irq_flags != IRQF_TRIGGER_HIGH && - host_vtimer_irq_flags != IRQF_TRIGGER_LOW) { - kvm_err("Invalid trigger for vtimer IRQ%d, assuming level low\n", - host_vtimer_irq); - host_vtimer_irq_flags = IRQF_TRIGGER_LOW; - } - - err = request_percpu_irq(host_vtimer_irq, kvm_arch_timer_handler, - "kvm guest vtimer", kvm_get_running_vcpus()); - if (err) { - kvm_err("kvm_arch_timer: can't request vtimer interrupt %d (%d)\n", - host_vtimer_irq, err); - return err; - } - - if (has_gic) { - err = irq_set_vcpu_affinity(host_vtimer_irq, - kvm_get_running_vcpus()); - if (err) { - kvm_err("kvm_arch_timer: error setting vcpu affinity\n"); - goto out_free_irq; - } - - static_branch_enable(&has_gic_active_state); - } - - kvm_debug("virtual timer IRQ%d\n", host_vtimer_irq); - - /* Now let's do the physical EL1 timer irq */ - - if (info->physical_irq > 0) { - host_ptimer_irq = info->physical_irq; - host_ptimer_irq_flags = irq_get_trigger_type(host_ptimer_irq); - if (host_ptimer_irq_flags != IRQF_TRIGGER_HIGH && - host_ptimer_irq_flags != IRQF_TRIGGER_LOW) { - kvm_err("Invalid trigger for ptimer IRQ%d, assuming level low\n", - host_ptimer_irq); - host_ptimer_irq_flags = IRQF_TRIGGER_LOW; - } - - err = request_percpu_irq(host_ptimer_irq, kvm_arch_timer_handler, - "kvm guest ptimer", kvm_get_running_vcpus()); - if (err) { - kvm_err("kvm_arch_timer: can't request ptimer interrupt %d (%d)\n", - host_ptimer_irq, err); - return err; - } - - if (has_gic) { - err = irq_set_vcpu_affinity(host_ptimer_irq, - kvm_get_running_vcpus()); - if (err) { - kvm_err("kvm_arch_timer: error setting vcpu affinity\n"); - goto out_free_irq; - } - } - - kvm_debug("physical timer IRQ%d\n", host_ptimer_irq); - } else if (has_vhe()) { - kvm_err("kvm_arch_timer: invalid physical timer IRQ: %d\n", - info->physical_irq); - err = -ENODEV; - goto out_free_irq; - } - - cpuhp_setup_state(CPUHP_AP_KVM_ARM_TIMER_STARTING, - "kvm/arm/timer:starting", kvm_timer_starting_cpu, - kvm_timer_dying_cpu); - return 0; -out_free_irq: - free_percpu_irq(host_vtimer_irq, kvm_get_running_vcpus()); - return err; -} - -void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu) -{ - struct arch_timer_cpu *timer = vcpu_timer(vcpu); - - soft_timer_cancel(&timer->bg_timer); -} - -static bool timer_irqs_are_valid(struct kvm_vcpu *vcpu) -{ - int vtimer_irq, ptimer_irq; - int i, ret; - - vtimer_irq = vcpu_vtimer(vcpu)->irq.irq; - ret = kvm_vgic_set_owner(vcpu, vtimer_irq, vcpu_vtimer(vcpu)); - if (ret) - return false; - - ptimer_irq = vcpu_ptimer(vcpu)->irq.irq; - ret = kvm_vgic_set_owner(vcpu, ptimer_irq, vcpu_ptimer(vcpu)); - if (ret) - return false; - - kvm_for_each_vcpu(i, vcpu, vcpu->kvm) { - if (vcpu_vtimer(vcpu)->irq.irq != vtimer_irq || - vcpu_ptimer(vcpu)->irq.irq != ptimer_irq) - return false; - } - - return true; -} - -bool kvm_arch_timer_get_input_level(int vintid) -{ - struct kvm_vcpu *vcpu = kvm_get_running_vcpu(); - struct arch_timer_context *timer; - - if (vintid == vcpu_vtimer(vcpu)->irq.irq) - timer = vcpu_vtimer(vcpu); - else if (vintid == vcpu_ptimer(vcpu)->irq.irq) - timer = vcpu_ptimer(vcpu); - else - BUG(); - - return kvm_timer_should_fire(timer); -} - -int kvm_timer_enable(struct kvm_vcpu *vcpu) -{ - struct arch_timer_cpu *timer = vcpu_timer(vcpu); - struct timer_map map; - int ret; - - if (timer->enabled) - return 0; - - /* Without a VGIC we do not map virtual IRQs to physical IRQs */ - if (!irqchip_in_kernel(vcpu->kvm)) - goto no_vgic; - - if (!vgic_initialized(vcpu->kvm)) - return -ENODEV; - - if (!timer_irqs_are_valid(vcpu)) { - kvm_debug("incorrectly configured timer irqs\n"); - return -EINVAL; - } - - get_timer_map(vcpu, &map); - - ret = kvm_vgic_map_phys_irq(vcpu, - map.direct_vtimer->host_timer_irq, - map.direct_vtimer->irq.irq, - kvm_arch_timer_get_input_level); - if (ret) - return ret; - - if (map.direct_ptimer) { - ret = kvm_vgic_map_phys_irq(vcpu, - map.direct_ptimer->host_timer_irq, - map.direct_ptimer->irq.irq, - kvm_arch_timer_get_input_level); - } - - if (ret) - return ret; - -no_vgic: - timer->enabled = 1; - return 0; -} - -/* - * On VHE system, we only need to configure the EL2 timer trap register once, - * not for every world switch. - * The host kernel runs at EL2 with HCR_EL2.TGE == 1, - * and this makes those bits have no effect for the host kernel execution. - */ -void kvm_timer_init_vhe(void) -{ - /* When HCR_EL2.E2H ==1, EL1PCEN and EL1PCTEN are shifted by 10 */ - u32 cnthctl_shift = 10; - u64 val; - - /* - * VHE systems allow the guest direct access to the EL1 physical - * timer/counter. - */ - val = read_sysreg(cnthctl_el2); - val |= (CNTHCTL_EL1PCEN << cnthctl_shift); - val |= (CNTHCTL_EL1PCTEN << cnthctl_shift); - write_sysreg(val, cnthctl_el2); -} - -static void set_timer_irqs(struct kvm *kvm, int vtimer_irq, int ptimer_irq) -{ - struct kvm_vcpu *vcpu; - int i; - - kvm_for_each_vcpu(i, vcpu, kvm) { - vcpu_vtimer(vcpu)->irq.irq = vtimer_irq; - vcpu_ptimer(vcpu)->irq.irq = ptimer_irq; - } -} - -int kvm_arm_timer_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr) -{ - int __user *uaddr = (int __user *)(long)attr->addr; - struct arch_timer_context *vtimer = vcpu_vtimer(vcpu); - struct arch_timer_context *ptimer = vcpu_ptimer(vcpu); - int irq; - - if (!irqchip_in_kernel(vcpu->kvm)) - return -EINVAL; - - if (get_user(irq, uaddr)) - return -EFAULT; - - if (!(irq_is_ppi(irq))) - return -EINVAL; - - if (vcpu->arch.timer_cpu.enabled) - return -EBUSY; - - switch (attr->attr) { - case KVM_ARM_VCPU_TIMER_IRQ_VTIMER: - set_timer_irqs(vcpu->kvm, irq, ptimer->irq.irq); - break; - case KVM_ARM_VCPU_TIMER_IRQ_PTIMER: - set_timer_irqs(vcpu->kvm, vtimer->irq.irq, irq); - break; - default: - return -ENXIO; - } - - return 0; -} - -int kvm_arm_timer_get_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr) -{ - int __user *uaddr = (int __user *)(long)attr->addr; - struct arch_timer_context *timer; - int irq; - - switch (attr->attr) { - case KVM_ARM_VCPU_TIMER_IRQ_VTIMER: - timer = vcpu_vtimer(vcpu); - break; - case KVM_ARM_VCPU_TIMER_IRQ_PTIMER: - timer = vcpu_ptimer(vcpu); - break; - default: - return -ENXIO; - } - - irq = timer->irq.irq; - return put_user(irq, uaddr); -} - -int kvm_arm_timer_has_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr) -{ - switch (attr->attr) { - case KVM_ARM_VCPU_TIMER_IRQ_VTIMER: - case KVM_ARM_VCPU_TIMER_IRQ_PTIMER: - return 0; - } - - return -ENXIO; -} |