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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-04-17 20:30:26 +0000
committerAlexander Graf <agraf@suse.de>2013-04-26 20:27:30 +0200
commitbc5ad3f3701116e7db57268e6f89010ec714697e (patch)
tree21a00d1213598eab4dc0ae3fb03bb7ba3344185a /arch/powerpc/kvm/Kconfig
parent8e591cb7204739efa8e15967ea334eb367039dde (diff)
KVM: PPC: Book3S: Add kernel emulation for the XICS interrupt controller
This adds in-kernel emulation of the XICS (eXternal Interrupt Controller Specification) interrupt controller specified by PAPR, for both HV and PR KVM guests. The XICS emulation supports up to 1048560 interrupt sources. Interrupt source numbers below 16 are reserved; 0 is used to mean no interrupt and 2 is used for IPIs. Internally these are represented in blocks of 1024, called ICS (interrupt controller source) entities, but that is not visible to userspace. Each vcpu gets one ICP (interrupt controller presentation) entity, used to store the per-vcpu state such as vcpu priority, pending interrupt state, IPI request, etc. This does not include any API or any way to connect vcpus to their ICP state; that will be added in later patches. This is based on an initial implementation by Michael Ellerman <michael@ellerman.id.au> reworked by Benjamin Herrenschmidt and Paul Mackerras. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org> [agraf: fix typo, add dependency on !KVM_MPIC] Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc/kvm/Kconfig')
-rw-r--r--arch/powerpc/kvm/Kconfig8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/Kconfig b/arch/powerpc/kvm/Kconfig
index 656e0bc29fe8..eb643f862579 100644
--- a/arch/powerpc/kvm/Kconfig
+++ b/arch/powerpc/kvm/Kconfig
@@ -163,6 +163,14 @@ config KVM_MPIC
Currently, support is limited to certain versions of
Freescale's MPIC implementation.
+config KVM_XICS
+ bool "KVM in-kernel XICS emulation"
+ depends on KVM_BOOK3S_64 && !KVM_MPIC
+ ---help---
+ Include support for the XICS (eXternal Interrupt Controller
+ Specification) interrupt controller architecture used on
+ IBM POWER (pSeries) servers.
+
source drivers/vhost/Kconfig
endif # VIRTUALIZATION