From: Christoffer Dall <christoffer.dall@linaro.org> To: Paolo Bonzini <pbonzini@redhat.com>, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Marc Zyngier <marc.zyngier@arm.com>, Christoffer Dall <christoffer.dall@linaro.org> Subject: [PULL 02/21] arm/arm64: KVM: arch_timer: Only schedule soft timer on vcpu_block Date: Wed, 4 Nov 2015 15:49:41 +0100 [thread overview] Message-ID: <1446648600-27297-3-git-send-email-christoffer.dall@linaro.org> (raw) In-Reply-To: <1446648600-27297-1-git-send-email-christoffer.dall@linaro.org> We currently schedule a soft timer every time we exit the guest if the timer did not expire while running the guest. This is really not necessary, because the only work we do in the timer work function is to kick the vcpu. Kicking the vcpu does two things: (1) If the vpcu thread is on a waitqueue, make it runnable and remove it from the waitqueue. (2) If the vcpu is running on a different physical CPU from the one doing the kick, it sends a reschedule IPI. The second case cannot happen, because the soft timer is only ever scheduled when the vcpu is not running. The first case is only relevant when the vcpu thread is on a waitqueue, which is only the case when the vcpu thread has called kvm_vcpu_block(). Therefore, we only need to make sure a timer is scheduled for kvm_vcpu_block(), which we do by encapsulating all calls to kvm_vcpu_block() with kvm_timer_{un}schedule calls. Additionally, we only schedule a soft timer if the timer is enabled and unmasked, since it is useless otherwise. Note that theoretically userspace can use the SET_ONE_REG interface to change registers that should cause the timer to fire, even if the vcpu is blocked without a scheduled timer, but this case was not supported before this patch and we leave it for future work for now. Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org> --- arch/arm/include/asm/kvm_host.h | 3 -- arch/arm/kvm/arm.c | 10 +++++ arch/arm64/include/asm/kvm_host.h | 3 -- include/kvm/arm_arch_timer.h | 2 + virt/kvm/arm/arch_timer.c | 94 +++++++++++++++++++++++++-------------- 5 files changed, 72 insertions(+), 40 deletions(-) diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h index 84da979..c4072d9 100644 --- a/arch/arm/include/asm/kvm_host.h +++ b/arch/arm/include/asm/kvm_host.h @@ -234,7 +234,4 @@ static inline void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) {} static inline void kvm_arm_clear_debug(struct kvm_vcpu *vcpu) {} static inline void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu) {} -static inline void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) {} -static inline void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) {} - #endif /* __ARM_KVM_HOST_H__ */ diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c index 78b2869..7ed4d47 100644 --- a/arch/arm/kvm/arm.c +++ b/arch/arm/kvm/arm.c @@ -271,6 +271,16 @@ int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) return kvm_timer_should_fire(vcpu); } +void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) +{ + kvm_timer_schedule(vcpu); +} + +void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) +{ + kvm_timer_unschedule(vcpu); +} + int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) { /* Force users to call KVM_ARM_VCPU_INIT */ diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index e4f4d65..ed03968 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -255,7 +255,4 @@ void kvm_arm_setup_debug(struct kvm_vcpu *vcpu); void kvm_arm_clear_debug(struct kvm_vcpu *vcpu); void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu); -static inline void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) {} -static inline void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) {} - #endif /* __ARM64_KVM_HOST_H__ */ diff --git a/include/kvm/arm_arch_timer.h b/include/kvm/arm_arch_timer.h index e1e4d7c..ef14cc1 100644 --- a/include/kvm/arm_arch_timer.h +++ b/include/kvm/arm_arch_timer.h @@ -71,5 +71,7 @@ u64 kvm_arm_timer_get_reg(struct kvm_vcpu *, u64 regid); int kvm_arm_timer_set_reg(struct kvm_vcpu *, u64 regid, u64 value); bool kvm_timer_should_fire(struct kvm_vcpu *vcpu); +void kvm_timer_schedule(struct kvm_vcpu *vcpu); +void kvm_timer_unschedule(struct kvm_vcpu *vcpu); #endif diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c index b9d3a32..32095fb 100644 --- a/virt/kvm/arm/arch_timer.c +++ b/virt/kvm/arm/arch_timer.c @@ -111,14 +111,21 @@ static enum hrtimer_restart kvm_timer_expire(struct hrtimer *hrt) return HRTIMER_NORESTART; } +static bool kvm_timer_irq_can_fire(struct kvm_vcpu *vcpu) +{ + struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu; + + return !(timer->cntv_ctl & ARCH_TIMER_CTRL_IT_MASK) && + (timer->cntv_ctl & ARCH_TIMER_CTRL_ENABLE) && + !kvm_vgic_get_phys_irq_active(timer->map); +} + bool kvm_timer_should_fire(struct kvm_vcpu *vcpu) { struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu; cycle_t cval, now; - if ((timer->cntv_ctl & ARCH_TIMER_CTRL_IT_MASK) || - !(timer->cntv_ctl & ARCH_TIMER_CTRL_ENABLE) || - kvm_vgic_get_phys_irq_active(timer->map)) + if (!kvm_timer_irq_can_fire(vcpu)) return false; cval = timer->cntv_cval; @@ -127,12 +134,57 @@ bool kvm_timer_should_fire(struct kvm_vcpu *vcpu) return cval <= now; } +/* + * 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. + */ +void kvm_timer_schedule(struct kvm_vcpu *vcpu) +{ + struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu; + u64 ns; + cycle_t cval, now; + + BUG_ON(timer_is_armed(timer)); + + /* + * No need to schedule a background timer if the guest timer has + * already expired, because kvm_vcpu_block will return before putting + * the thread to sleep. + */ + if (kvm_timer_should_fire(vcpu)) + return; + + /* + * If the timer is not capable of raising interrupts (disabled or + * masked), then there's no more work for us to do. + */ + if (!kvm_timer_irq_can_fire(vcpu)) + return; + + /* The timer has not yet expired, schedule a background timer */ + cval = timer->cntv_cval; + now = kvm_phys_timer_read() - vcpu->kvm->arch.timer.cntvoff; + + ns = cyclecounter_cyc2ns(timecounter->cc, + cval - now, + timecounter->mask, + &timecounter->frac); + timer_arm(timer, ns); +} + +void kvm_timer_unschedule(struct kvm_vcpu *vcpu) +{ + struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu; + timer_disarm(timer); +} + /** * kvm_timer_flush_hwstate - prepare to move the virt timer to the cpu * @vcpu: The vcpu pointer * - * Disarm any pending soft timers, since the world-switch code will write the - * virtual timer state back to the physical CPU. + * Check if the virtual timer has expired while we were running in the host, + * and inject an interrupt if that was the case. */ void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu) { @@ -140,17 +192,6 @@ void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu) bool phys_active; int ret; - /* - * We're about to run this vcpu again, so there is no need to - * keep the background timer running, as we're about to - * populate the CPU timer again. - */ - timer_disarm(timer); - - /* - * If the timer expired while we were not scheduled, now is the time - * to inject it. - */ if (kvm_timer_should_fire(vcpu)) kvm_timer_inject_irq(vcpu); @@ -176,32 +217,17 @@ void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu) * kvm_timer_sync_hwstate - sync timer state from cpu * @vcpu: The vcpu pointer * - * Check if the virtual timer was armed and either schedule a corresponding - * soft timer or inject directly if already expired. + * Check if the virtual timer has expired while we were running in the guest, + * and inject an interrupt if that was the case. */ void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu) { struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu; - cycle_t cval, now; - u64 ns; BUG_ON(timer_is_armed(timer)); - if (kvm_timer_should_fire(vcpu)) { - /* - * Timer has already expired while we were not - * looking. Inject the interrupt and carry on. - */ + if (kvm_timer_should_fire(vcpu)) kvm_timer_inject_irq(vcpu); - return; - } - - cval = timer->cntv_cval; - now = kvm_phys_timer_read() - vcpu->kvm->arch.timer.cntvoff; - - ns = cyclecounter_cyc2ns(timecounter->cc, cval - now, timecounter->mask, - &timecounter->frac); - timer_arm(timer, ns); } int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu, -- 2.1.2.330.g565301e.dirty
WARNING: multiple messages have this Message-ID (diff)
From: christoffer.dall@linaro.org (Christoffer Dall) To: linux-arm-kernel@lists.infradead.org Subject: [PULL 02/21] arm/arm64: KVM: arch_timer: Only schedule soft timer on vcpu_block Date: Wed, 4 Nov 2015 15:49:41 +0100 [thread overview] Message-ID: <1446648600-27297-3-git-send-email-christoffer.dall@linaro.org> (raw) In-Reply-To: <1446648600-27297-1-git-send-email-christoffer.dall@linaro.org> We currently schedule a soft timer every time we exit the guest if the timer did not expire while running the guest. This is really not necessary, because the only work we do in the timer work function is to kick the vcpu. Kicking the vcpu does two things: (1) If the vpcu thread is on a waitqueue, make it runnable and remove it from the waitqueue. (2) If the vcpu is running on a different physical CPU from the one doing the kick, it sends a reschedule IPI. The second case cannot happen, because the soft timer is only ever scheduled when the vcpu is not running. The first case is only relevant when the vcpu thread is on a waitqueue, which is only the case when the vcpu thread has called kvm_vcpu_block(). Therefore, we only need to make sure a timer is scheduled for kvm_vcpu_block(), which we do by encapsulating all calls to kvm_vcpu_block() with kvm_timer_{un}schedule calls. Additionally, we only schedule a soft timer if the timer is enabled and unmasked, since it is useless otherwise. Note that theoretically userspace can use the SET_ONE_REG interface to change registers that should cause the timer to fire, even if the vcpu is blocked without a scheduled timer, but this case was not supported before this patch and we leave it for future work for now. Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org> --- arch/arm/include/asm/kvm_host.h | 3 -- arch/arm/kvm/arm.c | 10 +++++ arch/arm64/include/asm/kvm_host.h | 3 -- include/kvm/arm_arch_timer.h | 2 + virt/kvm/arm/arch_timer.c | 94 +++++++++++++++++++++++++-------------- 5 files changed, 72 insertions(+), 40 deletions(-) diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h index 84da979..c4072d9 100644 --- a/arch/arm/include/asm/kvm_host.h +++ b/arch/arm/include/asm/kvm_host.h @@ -234,7 +234,4 @@ static inline void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) {} static inline void kvm_arm_clear_debug(struct kvm_vcpu *vcpu) {} static inline void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu) {} -static inline void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) {} -static inline void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) {} - #endif /* __ARM_KVM_HOST_H__ */ diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c index 78b2869..7ed4d47 100644 --- a/arch/arm/kvm/arm.c +++ b/arch/arm/kvm/arm.c @@ -271,6 +271,16 @@ int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) return kvm_timer_should_fire(vcpu); } +void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) +{ + kvm_timer_schedule(vcpu); +} + +void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) +{ + kvm_timer_unschedule(vcpu); +} + int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) { /* Force users to call KVM_ARM_VCPU_INIT */ diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index e4f4d65..ed03968 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -255,7 +255,4 @@ void kvm_arm_setup_debug(struct kvm_vcpu *vcpu); void kvm_arm_clear_debug(struct kvm_vcpu *vcpu); void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu); -static inline void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) {} -static inline void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) {} - #endif /* __ARM64_KVM_HOST_H__ */ diff --git a/include/kvm/arm_arch_timer.h b/include/kvm/arm_arch_timer.h index e1e4d7c..ef14cc1 100644 --- a/include/kvm/arm_arch_timer.h +++ b/include/kvm/arm_arch_timer.h @@ -71,5 +71,7 @@ u64 kvm_arm_timer_get_reg(struct kvm_vcpu *, u64 regid); int kvm_arm_timer_set_reg(struct kvm_vcpu *, u64 regid, u64 value); bool kvm_timer_should_fire(struct kvm_vcpu *vcpu); +void kvm_timer_schedule(struct kvm_vcpu *vcpu); +void kvm_timer_unschedule(struct kvm_vcpu *vcpu); #endif diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c index b9d3a32..32095fb 100644 --- a/virt/kvm/arm/arch_timer.c +++ b/virt/kvm/arm/arch_timer.c @@ -111,14 +111,21 @@ static enum hrtimer_restart kvm_timer_expire(struct hrtimer *hrt) return HRTIMER_NORESTART; } +static bool kvm_timer_irq_can_fire(struct kvm_vcpu *vcpu) +{ + struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu; + + return !(timer->cntv_ctl & ARCH_TIMER_CTRL_IT_MASK) && + (timer->cntv_ctl & ARCH_TIMER_CTRL_ENABLE) && + !kvm_vgic_get_phys_irq_active(timer->map); +} + bool kvm_timer_should_fire(struct kvm_vcpu *vcpu) { struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu; cycle_t cval, now; - if ((timer->cntv_ctl & ARCH_TIMER_CTRL_IT_MASK) || - !(timer->cntv_ctl & ARCH_TIMER_CTRL_ENABLE) || - kvm_vgic_get_phys_irq_active(timer->map)) + if (!kvm_timer_irq_can_fire(vcpu)) return false; cval = timer->cntv_cval; @@ -127,12 +134,57 @@ bool kvm_timer_should_fire(struct kvm_vcpu *vcpu) return cval <= now; } +/* + * 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. + */ +void kvm_timer_schedule(struct kvm_vcpu *vcpu) +{ + struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu; + u64 ns; + cycle_t cval, now; + + BUG_ON(timer_is_armed(timer)); + + /* + * No need to schedule a background timer if the guest timer has + * already expired, because kvm_vcpu_block will return before putting + * the thread to sleep. + */ + if (kvm_timer_should_fire(vcpu)) + return; + + /* + * If the timer is not capable of raising interrupts (disabled or + * masked), then there's no more work for us to do. + */ + if (!kvm_timer_irq_can_fire(vcpu)) + return; + + /* The timer has not yet expired, schedule a background timer */ + cval = timer->cntv_cval; + now = kvm_phys_timer_read() - vcpu->kvm->arch.timer.cntvoff; + + ns = cyclecounter_cyc2ns(timecounter->cc, + cval - now, + timecounter->mask, + &timecounter->frac); + timer_arm(timer, ns); +} + +void kvm_timer_unschedule(struct kvm_vcpu *vcpu) +{ + struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu; + timer_disarm(timer); +} + /** * kvm_timer_flush_hwstate - prepare to move the virt timer to the cpu * @vcpu: The vcpu pointer * - * Disarm any pending soft timers, since the world-switch code will write the - * virtual timer state back to the physical CPU. + * Check if the virtual timer has expired while we were running in the host, + * and inject an interrupt if that was the case. */ void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu) { @@ -140,17 +192,6 @@ void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu) bool phys_active; int ret; - /* - * We're about to run this vcpu again, so there is no need to - * keep the background timer running, as we're about to - * populate the CPU timer again. - */ - timer_disarm(timer); - - /* - * If the timer expired while we were not scheduled, now is the time - * to inject it. - */ if (kvm_timer_should_fire(vcpu)) kvm_timer_inject_irq(vcpu); @@ -176,32 +217,17 @@ void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu) * kvm_timer_sync_hwstate - sync timer state from cpu * @vcpu: The vcpu pointer * - * Check if the virtual timer was armed and either schedule a corresponding - * soft timer or inject directly if already expired. + * Check if the virtual timer has expired while we were running in the guest, + * and inject an interrupt if that was the case. */ void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu) { struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu; - cycle_t cval, now; - u64 ns; BUG_ON(timer_is_armed(timer)); - if (kvm_timer_should_fire(vcpu)) { - /* - * Timer has already expired while we were not - * looking. Inject the interrupt and carry on. - */ + if (kvm_timer_should_fire(vcpu)) kvm_timer_inject_irq(vcpu); - return; - } - - cval = timer->cntv_cval; - now = kvm_phys_timer_read() - vcpu->kvm->arch.timer.cntvoff; - - ns = cyclecounter_cyc2ns(timecounter->cc, cval - now, timecounter->mask, - &timecounter->frac); - timer_arm(timer, ns); } int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu, -- 2.1.2.330.g565301e.dirty
next prev parent reply other threads:[~2015-11-04 14:53 UTC|newest] Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-11-04 14:49 [PULL 00/21] KVM/ARM Changes for v4.4-rc1 Christoffer Dall 2015-11-04 14:49 ` Christoffer Dall 2015-11-04 14:49 ` [PULL 01/21] KVM: Add kvm_arch_vcpu_{un}blocking callbacks Christoffer Dall 2015-11-04 14:49 ` Christoffer Dall 2015-11-04 14:49 ` Christoffer Dall [this message] 2015-11-04 14:49 ` [PULL 02/21] arm/arm64: KVM: arch_timer: Only schedule soft timer on vcpu_block Christoffer Dall 2015-11-04 14:49 ` [PULL 03/21] arm/arm64: KVM: vgic: Factor out level irq processing on guest exit Christoffer Dall 2015-11-04 14:49 ` Christoffer Dall 2015-11-04 14:49 ` [PULL 04/21] arm/arm64: KVM: Implement GICD_ICFGR as RO for PPIs Christoffer Dall 2015-11-04 14:49 ` Christoffer Dall 2015-11-04 14:49 ` [PULL 05/21] arm/arm64: KVM: Use appropriate define in VGIC reset code Christoffer Dall 2015-11-04 14:49 ` Christoffer Dall 2015-11-04 14:49 ` [PULL 06/21] arm/arm64: KVM: Add forwarded physical interrupts documentation Christoffer Dall 2015-11-04 14:49 ` Christoffer Dall 2015-11-04 14:49 ` [PULL 07/21] arm/arm64: KVM: Rework the arch timer to use level-triggered semantics Christoffer Dall 2015-11-04 14:49 ` Christoffer Dall 2015-11-04 14:49 ` [PULL 08/21] arm/arm64: KVM: Support edge-triggered forwarded interrupts Christoffer Dall 2015-11-04 14:49 ` Christoffer Dall 2015-11-04 14:49 ` [PULL 09/21] arm/arm64: KVM : Enable vhost device selection under KVM config menu Christoffer Dall 2015-11-04 14:49 ` Christoffer Dall 2015-11-04 14:49 ` [PULL 10/21] KVM: arm/arm64: rename pause into power_off Christoffer Dall 2015-11-04 14:49 ` Christoffer Dall 2015-11-04 14:49 ` [PULL 11/21] KVM: arm/arm64: check power_off in kvm_arch_vcpu_runnable Christoffer Dall 2015-11-04 14:49 ` Christoffer Dall 2015-11-04 14:49 ` [PULL 12/21] KVM: arm/arm64: check power_off in critical section before VCPU run Christoffer Dall 2015-11-04 14:49 ` Christoffer Dall 2015-11-04 14:49 ` [PULL 13/21] KVM: arm/arm64: implement kvm_arm_[halt,resume]_guest Christoffer Dall 2015-11-04 14:49 ` Christoffer Dall 2015-11-04 14:49 ` [PULL 14/21] KVM: arm/arm64: Fix vGIC documentation Christoffer Dall 2015-11-04 14:49 ` Christoffer Dall 2015-11-04 14:49 ` [PULL 15/21] arm/arm64: KVM: Improve kvm_exit tracepoint Christoffer Dall 2015-11-04 14:49 ` Christoffer Dall 2015-11-04 14:49 ` [PULL 16/21] arm/arm64: KVM: Add tracepoints for vgic and timer Christoffer Dall 2015-11-04 14:49 ` Christoffer Dall 2015-11-04 14:49 ` [PULL 17/21] arm64: kvm: restore EL1N SP for panic Christoffer Dall 2015-11-04 14:49 ` Christoffer Dall 2015-11-04 14:49 ` [PULL 18/21] KVM: arm: Do not indent the arguments of DECLARE_BITMAP Christoffer Dall 2015-11-04 14:49 ` Christoffer Dall 2015-11-04 14:49 ` [PULL 19/21] KVM: arm/arm64: Optimize away redundant LR tracking Christoffer Dall 2015-11-04 14:49 ` Christoffer Dall 2015-11-04 14:49 ` [PULL 20/21] KVM: arm/arm64: Clean up vgic_retire_lr() and surroundings Christoffer Dall 2015-11-04 14:49 ` Christoffer Dall 2015-11-04 14:50 ` [PULL 21/21] KVM: arm/arm64: Merge vgic_set_lr() and vgic_sync_lr_elrsr() Christoffer Dall 2015-11-04 14:50 ` Christoffer Dall 2015-11-04 15:28 ` [PULL 00/21] KVM/ARM Changes for v4.4-rc1 Paolo Bonzini 2015-11-04 15:28 ` Paolo Bonzini
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