On Tue, 2015-08-11 at 14:03 +0800, Feng Wu wrote:
> Implement the following callbacks for x86:
>
> - kvm_arch_irq_bypass_add_producer
> - kvm_arch_irq_bypass_del_producer
> - kvm_arch_irq_bypass_stop: dummy callback
> - kvm_arch_irq_bypass_resume: dummy callback
>
> and set CONFIG_HAVE_KVM_IRQ_BYPASS for x86.
>
> Signed-off-by: Feng Wu <feng.wu@xxxxxxxxx>
> ---
> arch/x86/include/asm/kvm_host.h | 1 +
> arch/x86/kvm/Kconfig | 1 +
> arch/x86/kvm/x86.c | 39 +++++++++++++++++++++++++++++++++++++++
> 3 files changed, 41 insertions(+)
>
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index 82d0709..3038c1b 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -24,6 +24,7 @@
> #include <linux/perf_event.h>
> #include <linux/pvclock_gtod.h>
> #include <linux/clocksource.h>
> +#include <linux/irqbypass.h>
>
> #include <asm/pvclock-abi.h>
> #include <asm/desc.h>
> diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
> index c951d44..b90776f 100644
> --- a/arch/x86/kvm/Kconfig
> +++ b/arch/x86/kvm/Kconfig
> @@ -30,6 +30,7 @@ config KVM
> select HAVE_KVM_IRQCHIP
> select HAVE_KVM_IRQFD
> select IRQ_BYPASS_MANAGER
> + select HAVE_KVM_IRQ_BYPASS
> select HAVE_KVM_IRQ_ROUTING
> select HAVE_KVM_EVENTFD
> select KVM_APIC_ARCHITECTURE
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 8f09a76..8df7b0d 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -50,6 +50,8 @@
> #include <linux/pci.h>
> #include <linux/timekeeper_internal.h>
> #include <linux/pvclock_gtod.h>
> +#include <linux/kvm_irqfd.h>
> +#include <linux/irqbypass.h>
> #include <trace/events/kvm.h>
>
> #define CREATE_TRACE_POINTS
> @@ -8321,6 +8323,43 @@ out:
> return ret;
> }
>
> +int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *cons,
> + struct irq_bypass_producer *prod)
> +{
> + struct kvm_kernel_irqfd *irqfd =
> + container_of(cons, struct kvm_kernel_irqfd, consumer);
> +
> + irqfd->producer = prod;
> +
> + return kvm_arch_update_pi_irte(irqfd->kvm, prod->irq, irqfd->gsi, 1);
> +}
> +
> +void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons,
> + struct irq_bypass_producer *prod)
> +{
> + int ret;
> + struct kvm_kernel_irqfd *irqfd =
> + container_of(cons, struct kvm_kernel_irqfd, consumer);
> +
> + irqfd->producer = NULL;
> +
> + /*
> + * When producer of consumer is unregistered, we change back to
> + * remapped mode, so we can re-use the current implementation
> + * when the irq is masked/disabed or the consumer side (KVM
> + * int this case doesn't want to receive the interrupts.
> + */
> + ret = kvm_arch_update_pi_irte(irqfd->kvm, prod->irq, irqfd->gsi, 0);
> + WARN_ON(ret);
> +}
Some tracing support would be nice here so we have some way to determine
whether we've made a successful connection.
> +
> +void kvm_arch_irq_bypass_stop(struct irq_bypass_consumer *cons)
> +{
> +}
> +void kvm_arch_irq_bypass_start(struct irq_bypass_consumer *cons)
> +{
> +}
Can't we define a common version of these with __attribute__((weak)) so
that archs that don't need them don't need to add this cruft?
> +
> EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_exit);
> EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq);
> EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_page_fault);
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