From: Marcelo Tosatti <mtosatti@redhat.com>
To: Christoffer Dall <c.dall@virtualopensystems.com>
Cc: kvm@vger.kernel.org, Marc.Zyngier@arm.com, agraf@suse.de,
kvm-ppc@vger.kernel.org, avi@redhat.com,
tech@virtualopensystems.com
Subject: Re: [PATCH v2] KVM: Factor out kvm_vcpu_kick to arch-generic code
Date: Mon, 6 Feb 2012 16:25:04 -0200 [thread overview]
Message-ID: <20120206182504.GC19821@amt.cnet> (raw)
In-Reply-To: <20120125042739.16236.95639.stgit@localhost>
On Tue, Jan 24, 2012 at 11:27:39PM -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.
>
> Changes since v1:
> - Abstact CPU mode check into arch-specific function
> - Remove redundant vcpu->cpu assignment
>
> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
> ---
> arch/ia64/include/asm/kvm_host.h | 1 +
> arch/ia64/kvm/kvm-ia64.c | 16 ----------------
> arch/powerpc/include/asm/kvm_host.h | 6 ++++++
> arch/powerpc/kvm/powerpc.c | 18 +++++++-----------
> arch/s390/kvm/kvm-s390.c | 8 ++++++++
> arch/x86/kvm/x86.c | 17 ++---------------
> include/linux/kvm_host.h | 9 +++++++++
> virt/kvm/kvm_main.c | 23 +++++++++++++++++++++++
> 8 files changed, 56 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..428eb0b 100644
> --- a/arch/ia64/kvm/kvm-ia64.c
> +++ b/arch/ia64/kvm/kvm-ia64.c
> @@ -1402,7 +1402,6 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
> void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
> {
> if (cpu != vcpu->cpu) {
> - vcpu->cpu = cpu;
> if (vcpu->arch.ht_active)
> kvm_migrate_hlt_timer(vcpu);
> }
> @@ -1851,21 +1850,6 @@ 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..dd0c929 100644
> --- a/arch/powerpc/kvm/powerpc.c
> +++ b/arch/powerpc/kvm/powerpc.c
> @@ -42,6 +42,11 @@ int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
> !!(v->arch.pending_exceptions);
> }
>
> +int kvm_arch_vcpu_in_guest_mode(struct kvm_vcpu *vcpu)
> +{
> + return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
> +}
As mentioned previously, i fail to see where powerpc kvm sets
vcpu->mode?
> +
> int kvmppc_kvm_pv(struct kvm_vcpu *vcpu)
> {
> int nr = kvmppc_get_gpr(vcpu, 11);
> @@ -311,10 +316,7 @@ 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);
> }
>
> /*
> @@ -363,7 +365,6 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
> mtspr(SPRN_VRSAVE, vcpu->arch.vrsave);
> #endif
> kvmppc_core_vcpu_load(vcpu, cpu);
> - vcpu->cpu = smp_processor_id();
> }
>
> void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
> @@ -572,12 +573,7 @@ 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/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index d1c44573..5e2217f 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -380,6 +380,14 @@ int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
> return 0;
> }
>
> +int kvm_arch_vcpu_in_guest_mode(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 c38efd7..a1761ff 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -2252,7 +2252,6 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
> kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
> if (vcpu->cpu != cpu)
> kvm_migrate_timers(vcpu);
> - vcpu->cpu = cpu;
> }
This is wrong, kvm_sched_in fails to see vcpu->cpu properly. Please
keep vcpu->cpu assignment in arch code.
> accumulate_steal_time(vcpu);
> @@ -6688,21 +6687,9 @@ 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_in_guest_mode(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;
> }
>
next prev parent reply other threads:[~2012-02-06 19:08 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-25 4:27 [PATCH v2] KVM: Factor out kvm_vcpu_kick to arch-generic code Christoffer Dall
2012-02-06 18:25 ` Marcelo Tosatti [this message]
2012-02-06 20:06 ` Jan Kiszka
2012-02-06 20:22 ` Marcelo Tosatti
2012-02-08 16:52 ` Alexander Graf
2012-02-08 20:30 ` Christoffer Dall
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