On 10.02.2012, at 02:40, 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 d1c28f7568a74faacec896ee4f84afbffd20e5ab on
> git://git.kernel.org/pub/scm/virt/kvm/kvm.git.
>
> Changes since v3:
> - Doesn't try to generalize vcpu->mode across all architectures and
> instead calls kvm_arch_vcpu_should_kick, which is properly defined
> on x86 and ia64, but other architectures simply return 1 as to maintain
> status quo.
>
> Changes since v2:
> - Restore arch-specific vcpu->cpu assignment to arch-specific code
>
> Changes since v1:
> - Abstact CPU mode check into arch-specific function
> - Remove redundant vcpu->cpu assignment
>
> Signed-off-by: Christoffer Dall <c.dall@xxxxxxxxxxxxxxxxxxxxxx>
> ---
> arch/ia64/include/asm/kvm_host.h | 1 +
> arch/ia64/kvm/kvm-ia64.c | 20 +++++---------------
> arch/powerpc/include/asm/kvm_host.h | 6 ++++++
> arch/powerpc/kvm/powerpc.c | 21 ++++++---------------
> arch/s390/kvm/kvm-s390.c | 8 ++++++++
> arch/x86/kvm/x86.c | 16 ++--------------
> include/linux/kvm_host.h | 9 +++++++++
> virt/kvm/kvm_main.c | 22 ++++++++++++++++++++++
> 8 files changed, 59 insertions(+), 44 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 8ca7261..96dceaa 100644
> --- a/arch/ia64/kvm/kvm-ia64.c
> +++ b/arch/ia64/kvm/kvm-ia64.c
> @@ -1857,21 +1857,6 @@ 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);
> @@ -1941,6 +1926,11 @@ int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
> (kvm_highest_pending_irq(vcpu) != -1);
> }
>
> +int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
> +{
> + return (!test_and_set_bit(KVM_REQ_KICK, &vcpu->requests));
> +}
> +
> int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
> struct kvm_mp_state *mp_state)
> {
> diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
> index 1843d5d..d089969 100644
> --- a/arch/powerpc/include/asm/kvm_host.h
> +++ b/arch/powerpc/include/asm/kvm_host.h
> @@ -495,4 +495,10 @@ struct kvm_vcpu_arch {
> #define KVM_MMIO_REG_QPR 0x0040
> #define KVM_MMIO_REG_FQPR 0x0060
>
> +#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 0e21d15..b82e206 100644
> --- a/arch/powerpc/kvm/powerpc.c
> +++ b/arch/powerpc/kvm/powerpc.c
> @@ -43,6 +43,11 @@ int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
> v->requests;
> }
>
> +int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
> +{
> + return 1;
> +}
> +
> int kvmppc_kvm_pv(struct kvm_vcpu *vcpu)
> {
> int nr = kvmppc_get_gpr(vcpu, 11);
> @@ -578,21 +583,6 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
> return r;
> }
>
> -void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
> -{
> - int me;
> - int cpu = vcpu->cpu;
> -
> - me = get_cpu();
> - if (waitqueue_active(vcpu->arch.wqp)) {
> - wake_up_interruptible(vcpu->arch.wqp);
> - vcpu->stat.halt_wakeup++;
> - } else if (cpu != me && cpu != -1) {
> - smp_send_reschedule(vcpu->cpu);
> - }
> - put_cpu();
> -}
> -
> int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
> {
> if (irq->irq == KVM_INTERRUPT_UNSET) {
> @@ -601,6 +591,7 @@ int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
> }
>
> kvmppc_core_queue_external(vcpu, irq);
> +
Apart from this little glitch the patch looks fine to me. But I'd like to have Scott and Paul ack it too.
Alex
> kvm_vcpu_kick(vcpu);
>
> return 0;
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index 0b91679..aa907b7 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -422,6 +422,14 @@ int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
> return 0;
> }
>
> +int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
> +{
> + /* kvm common code refers to this, but never calls it */
> + BUG();
> + return 0;
> +}
> +
> +
> static int kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu)
> {
> kvm_s390_vcpu_initial_reset(vcpu);
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 2bd77a3..244bc9a 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -6207,21 +6207,9 @@ int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
> kvm_cpu_has_interrupt(vcpu));
> }
>
> -void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
> +int kvm_arch_vcpu_should_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();
> + return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
> }
>
> int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu)
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 9698080..f72e5f9 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -438,6 +438,7 @@ 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);
> @@ -506,6 +507,7 @@ int kvm_arch_hardware_setup(void);
> void kvm_arch_hardware_unsetup(void);
> void kvm_arch_check_processor_compat(void *rtn);
> int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
> +int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu);
>
> void kvm_free_physmem(struct kvm *kvm);
>
> @@ -521,6 +523,13 @@ 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, unsigned long type);
> 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 470e305..b531928 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -1562,6 +1562,28 @@ 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_arch_vcpu_should_kick(vcpu))
> + smp_send_reschedule(cpu);
> + put_cpu();
> +}
> +
> void kvm_resched(struct kvm_vcpu *vcpu)
> {
> if (!need_resched())
>
> --
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