KVM: arm64: Move virt/kvm/arm to arch/arm64

Now that the 32bit KVM/arm host is a distant memory, let's move the
whole of the KVM/arm64 code into the arm64 tree.

As they said in the song: Welcome Home (Sanitarium).

Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20200513104034.74741-1-maz@kernel.org

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;
-}