From 3607715a308d94b8c4797d23620e268a4c5bebf6 Mon Sep 17 00:00:00 2001 From: David Gibson Date: Thu, 17 Oct 2019 12:12:35 +1100 Subject: kvm: Introduce KVM irqchip change notifier Awareness of an in kernel irqchip is usually local to the machine and its top-level interrupt controller. However, in a few cases other things need to know about it. In particular vfio devices need this in order to accelerate interrupt delivery. If interrupt routing is changed, such devices may need to readjust their connection to the KVM irqchip. pci_bus_fire_intx_routing_notifier() exists to do just this. However, for the pseries machine type we have a situation where the routing remains constant but the top-level irq chip itself is changed. This occurs because of PAPR feature negotiation which allows the guest to decide between the older XICS and newer XIVE irq chip models (both of which are paravirtualized). To allow devices like vfio to adjust to this change, introduce a new notifier for the purpose kvm_irqchip_change_notify(). Cc: Alex Williamson Cc: Alexey Kardashevskiy Signed-off-by: David Gibson Tested-by: Alex Williamson Reviewed-by: Alex Williamson Reviewed-by: Greg Kurz Acked-by: Alex Williamson --- include/sysemu/kvm.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'include/sysemu') diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h index 9d14328..9fe233b 100644 --- a/include/sysemu/kvm.h +++ b/include/sysemu/kvm.h @@ -201,6 +201,7 @@ typedef struct KVMCapabilityInfo { struct KVMState; typedef struct KVMState KVMState; extern KVMState *kvm_state; +typedef struct Notifier Notifier; /* external API */ @@ -401,6 +402,10 @@ int kvm_irqchip_send_msi(KVMState *s, MSIMessage msg); void kvm_irqchip_add_irq_route(KVMState *s, int gsi, int irqchip, int pin); +void kvm_irqchip_add_change_notifier(Notifier *n); +void kvm_irqchip_remove_change_notifier(Notifier *n); +void kvm_irqchip_change_notify(void); + void kvm_get_apic_state(DeviceState *d, struct kvm_lapic_state *kapic); struct kvm_guest_debug; -- cgit v1.1