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xics-kvm: Support for in-kernel XICS interrupt controller

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Recent (host) kernels support emulating the PAPR defined "XICS" interrupt
controller system within KVM.  This patch allows qemu to initialize and
configure the in-kernel XICS, and keep its state in sync with qemu's XICS
state as necessary.

This should give considerable performance improvements.  e.g. on a simple
IPI ping-pong test between hardware threads, using qemu XICS gives us
around 5,000 irqs/second, whereas the in-kernel XICS gives us around
70,000 irqs/s on the same hardware configuration.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
[Mike Qiu <qiudayu@linux.vnet.ibm.com>: fixed mistype which caused ics_set_kvm_state() to fail]
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
David Gibson 2013-09-26 16:18:44 +10:00 • committed by Alexander Graf
parent 5eb92ccc3f
commit 11ad93f681
5 changed files with 520 additions and 1 deletions
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1
hw/intc/Makefile.objs
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@ -23,3 +23,4 @@ obj-$(CONFIG_OMAP) += omap_intc.o
obj-$(CONFIG_OPENPIC_KVM) += openpic_kvm.o
obj-$(CONFIG_SH4) += sh_intc.o
obj-$(CONFIG_XICS) += xics.o
obj-$(CONFIG_XICS_KVM) += xics_kvm.o