[02/17] KVM: Introduce CONFIG_HAVE_KVM_IRQ_ROUTING

Quite a bit of code in KVM has been conditionalized on availability of
IOAPIC emulation. However, most of it is generically applicable to
platforms that don't have an IOPIC, but a different type of irq chip.

Make code that only relies on IRQ routing, not an APIC itself, on
CONFIG_HAVE_KVM_IRQ_ROUTING, so that we can reuse it later.

Signed-off-by: Alexander Graf <agraf@suse.de>
---
 arch/x86/kvm/Kconfig     |    1 +
 include/linux/kvm_host.h |    6 +++---
 virt/kvm/Kconfig         |    3 +++
 virt/kvm/eventfd.c       |    6 +++---
 virt/kvm/kvm_main.c      |    2 +-
 5 files changed, 11 insertions(+), 7 deletions(-)

On Fri, Apr 19, 2013 at 04:06:13PM +0200, Alexander Graf wrote:
> Quite a bit of code in KVM has been conditionalized on availability of
> IOAPIC emulation. However, most of it is generically applicable to
> platforms that don't have an IOPIC, but a different type of irq chip.
> 
> Make code that only relies on IRQ routing, not an APIC itself, on
> CONFIG_HAVE_KVM_IRQ_ROUTING, so that we can reuse it later.
> 
> Signed-off-by: Alexander Graf <agraf@suse.de>

Acked-by: Michael S. Tsirkin <mst@redhat.com>

> ---
>  arch/x86/kvm/Kconfig     |    1 +
>  include/linux/kvm_host.h |    6 +++---
>  virt/kvm/Kconfig         |    3 +++
>  virt/kvm/eventfd.c       |    6 +++---
>  virt/kvm/kvm_main.c      |    2 +-
>  5 files changed, 11 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
> index 586f000..9d50efd 100644
> --- a/arch/x86/kvm/Kconfig
> +++ b/arch/x86/kvm/Kconfig
> @@ -29,6 +29,7 @@ config KVM
>  	select MMU_NOTIFIER
>  	select ANON_INODES
>  	select HAVE_KVM_IRQCHIP
> +	select HAVE_KVM_IRQ_ROUTING
>  	select HAVE_KVM_EVENTFD
>  	select KVM_APIC_ARCHITECTURE
>  	select KVM_ASYNC_PF
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index bf3b1dc..4215d4f 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -304,7 +304,7 @@ struct kvm_kernel_irq_routing_entry {
>  	struct hlist_node link;
>  };
>  
> -#ifdef __KVM_HAVE_IOAPIC
> +#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
>  
>  struct kvm_irq_routing_table {
>  	int chip[KVM_NR_IRQCHIPS][KVM_IRQCHIP_NUM_PINS];
> @@ -432,7 +432,7 @@ void kvm_vcpu_uninit(struct kvm_vcpu *vcpu);
>  int __must_check vcpu_load(struct kvm_vcpu *vcpu);
>  void vcpu_put(struct kvm_vcpu *vcpu);
>  
> -#ifdef __KVM_HAVE_IOAPIC
> +#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
>  int kvm_irqfd_init(void);
>  void kvm_irqfd_exit(void);
>  #else
> @@ -957,7 +957,7 @@ static inline int mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq)
>  }
>  #endif
>  
> -#ifdef KVM_CAP_IRQ_ROUTING
> +#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
>  
>  #define KVM_MAX_IRQ_ROUTES 1024
>  
> diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig
> index d01b24b..779262f 100644
> --- a/virt/kvm/Kconfig
> +++ b/virt/kvm/Kconfig
> @@ -6,6 +6,9 @@ config HAVE_KVM
>  config HAVE_KVM_IRQCHIP
>         bool
>  
> +config HAVE_KVM_IRQ_ROUTING
> +       bool
> +
>  config HAVE_KVM_EVENTFD
>         bool
>         select EVENTFD
> diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
> index c5d43ff..64ee720 100644
> --- a/virt/kvm/eventfd.c
> +++ b/virt/kvm/eventfd.c
> @@ -35,7 +35,7 @@
>  
>  #include "iodev.h"
>  
> -#ifdef __KVM_HAVE_IOAPIC
> +#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
>  /*
>   * --------------------------------------------------------------------
>   * irqfd: Allows an fd to be used to inject an interrupt to the guest
> @@ -433,7 +433,7 @@ fail:
>  void
>  kvm_eventfd_init(struct kvm *kvm)
>  {
> -#ifdef __KVM_HAVE_IOAPIC
> +#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
>  	spin_lock_init(&kvm->irqfds.lock);
>  	INIT_LIST_HEAD(&kvm->irqfds.items);
>  	INIT_LIST_HEAD(&kvm->irqfds.resampler_list);
> @@ -442,7 +442,7 @@ kvm_eventfd_init(struct kvm *kvm)
>  	INIT_LIST_HEAD(&kvm->ioeventfds);
>  }
>  
> -#ifdef __KVM_HAVE_IOAPIC
> +#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
>  /*
>   * shutdown any irqfd's that match fd+gsi
>   */
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index aaac1a7..2c3b226 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -2404,7 +2404,7 @@ static long kvm_dev_ioctl_check_extension_generic(long arg)
>  	case KVM_CAP_SIGNAL_MSI:
>  #endif
>  		return 1;
> -#ifdef KVM_CAP_IRQ_ROUTING
> +#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
>  	case KVM_CAP_IRQ_ROUTING:
>  		return KVM_MAX_IRQ_ROUTES;
>  #endif
> -- 
> 1.6.0.2
> 
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