On Thu, Jan 19, 2012 at 10:22:41PM -0500, Christoffer Dall wrote:
> The kvm_vcpu_kick function performs roughly the same funcitonality on
> most all architectures, so we shouldn't have separate copies.
>
> PowerPC keeps a pointer to interchanging waitqueues on the vcpu_arch
> structure and to accomodate this special need a
> __KVM_HAVE_ARCH_VCPU_GET_WQ define and accompanying function
> kvm_arch_vcpu_wq have been defined. For all other architectures this
> is a generic inline that just returns &vcpu->wq;
>
> This patch applies to Linus' tree on the Linux 3.3-rc1 tag.
>
> Signed-off-by: Christoffer Dall <c.dall@xxxxxxxxxxxxxxxxxxxxxx>
> ---
> arch/ia64/include/asm/kvm_host.h | 1 +
> arch/ia64/kvm/kvm-ia64.c | 15 ---------------
> arch/powerpc/include/asm/kvm_host.h | 6 ++++++
> arch/powerpc/kvm/powerpc.c | 12 ++----------
> arch/x86/kvm/x86.c | 17 -----------------
> include/linux/kvm_host.h | 8 ++++++++
> virt/kvm/kvm_main.c | 23 +++++++++++++++++++++++
> 7 files changed, 40 insertions(+), 42 deletions(-)
>
> diff --git a/arch/ia64/include/asm/kvm_host.h b/arch/ia64/include/asm/kvm_host.h
> index 2689ee5..06a5e91 100644
> --- a/arch/ia64/include/asm/kvm_host.h
> +++ b/arch/ia64/include/asm/kvm_host.h
> @@ -365,6 +365,7 @@ struct thash_cb {
> };
>
> struct kvm_vcpu_stat {
> + u32 halt_wakeup;
> };
>
> struct kvm_vcpu_arch {
> diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c
> index 43f4c92..f22ffb6 100644
> --- a/arch/ia64/kvm/kvm-ia64.c
> +++ b/arch/ia64/kvm/kvm-ia64.c
> @@ -1851,21 +1851,6 @@ void kvm_arch_hardware_unsetup(void)
> {
> }
>
> -void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
> -{
> - int me;
> - int cpu = vcpu->cpu;
> -
> - if (waitqueue_active(&vcpu->wq))
> - wake_up_interruptible(&vcpu->wq);
> -
> - me = get_cpu();
> - if (cpu != me && (unsigned) cpu < nr_cpu_ids && cpu_online(cpu))
> - if (!test_and_set_bit(KVM_REQ_KICK, &vcpu->requests))
> - smp_send_reschedule(cpu);
> - put_cpu();
> -}
> -
> int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq)
> {
> return __apic_accept_irq(vcpu, irq->vector);
> diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
> index bf8af5d..b687444 100644
> --- a/arch/powerpc/include/asm/kvm_host.h
> +++ b/arch/powerpc/include/asm/kvm_host.h
> @@ -438,4 +438,10 @@ struct kvm_vcpu_arch {
> #define KVMPPC_VCPU_BUSY_IN_HOST 1
> #define KVMPPC_VCPU_RUNNABLE 2
>
> +#define __KVM_HAVE_ARCH_VCPU_GET_WQ 1
> +static inline wait_queue_head *kvm_arch_vcpu_wq(struct kvm_vcpu *vcpu)
> +{
> + return vcpu->arch.wqp;
> +}
> +
> #endif /* __POWERPC_KVM_HOST_H__ */
> diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
> index 607fbdf..30cd621 100644
> --- a/arch/powerpc/kvm/powerpc.c
> +++ b/arch/powerpc/kvm/powerpc.c
> @@ -311,10 +311,7 @@ static void kvmppc_decrementer_func(unsigned long data)
>
> kvmppc_core_queue_dec(vcpu);
>
> - if (waitqueue_active(vcpu->arch.wqp)) {
> - wake_up_interruptible(vcpu->arch.wqp);
> - vcpu->stat.halt_wakeup++;
> - }
> + kvm_vcpu_kick(vcpu);
> }
>
> /*
> @@ -572,12 +569,7 @@ int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
>
> kvmppc_core_queue_external(vcpu, irq);
>
> - if (waitqueue_active(vcpu->arch.wqp)) {
> - wake_up_interruptible(vcpu->arch.wqp);
> - vcpu->stat.halt_wakeup++;
> - } else if (vcpu->cpu != -1) {
> - smp_send_reschedule(vcpu->cpu);
> - }
> + kvm_vcpu_kick(vcpu);
>
> return 0;
> }
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index c38efd7..6de0af8 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -6688,23 +6688,6 @@ int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
> kvm_cpu_has_interrupt(vcpu));
> }
>
> -void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
> -{
> - int me;
> - int cpu = vcpu->cpu;
> -
> - if (waitqueue_active(&vcpu->wq)) {
> - wake_up_interruptible(&vcpu->wq);
> - ++vcpu->stat.halt_wakeup;
> - }
> -
> - me = get_cpu();
> - if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
> - if (kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE)
> - smp_send_reschedule(cpu);
> - put_cpu();
> -}
> -
> int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu)
> {
> return kvm_x86_ops->interrupt_allowed(vcpu);
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index d526231..301ae34 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -407,6 +407,7 @@ void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot,
> gfn_t gfn);
>
> void kvm_vcpu_block(struct kvm_vcpu *vcpu);
> +void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
> void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu);
> void kvm_resched(struct kvm_vcpu *vcpu);
> void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
> @@ -489,6 +490,13 @@ static inline void kvm_arch_free_vm(struct kvm *kvm)
> }
> #endif
>
> +#ifndef __KVM_HAVE_ARCH_VCPU_GET_WQ
> +static inline wait_queue_head_t *kvm_arch_vcpu_wq(struct kvm_vcpu *vcpu)
> +{
> + return &vcpu->wq;
> +}
> +#endif
> +
> int kvm_arch_init_vm(struct kvm *kvm);
> void kvm_arch_destroy_vm(struct kvm *kvm);
> void kvm_free_all_assigned_devices(struct kvm *kvm);
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index d9cfb78..cd30b68 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -153,6 +153,7 @@ void vcpu_load(struct kvm_vcpu *vcpu)
> cpu = get_cpu();
> preempt_notifier_register(&vcpu->preempt_notifier);
> kvm_arch_vcpu_load(vcpu, cpu);
> + vcpu->cpu = cpu;
> put_cpu();
> }
>
> @@ -1528,6 +1529,28 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
> finish_wait(&vcpu->wq, &wait);
> }
>
> +/*
> + * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
> + */
> +void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
> +{
> + int me;
> + int cpu = vcpu->cpu;
> + wait_queue_head_t *wqp;
> +
> + wqp = kvm_arch_vcpu_wq(vcpu);
> + if (waitqueue_active(wqp)) {
> + wake_up_interruptible(wqp);
> + ++vcpu->stat.halt_wakeup;
> + }
> +
> + me = get_cpu();
> + if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
> + if (kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE)
> + smp_send_reschedule(cpu);
> + put_cpu();
> +}
> +
Only x86 and IA-64 set appropriate values for vcpu->mode. You probably
want to abstract the test away.
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