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| author | David Gibson <david@gibson.dropbear.id.au> | 2013-09-26 16:18:44 +1000 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2013-10-25 23:25:47 +0200 |
| commit | 11ad93f68195f68cc94d988f2aa50b4d190ee52a (patch) | |
| tree | 593486548707d61657eb62f024395fc55fddbdde /linux-headers | |
| parent | 5eb92ccc3f23f958c0d21bed7c22abe6c1f1adda (diff) | |
| download | qemu-11ad93f68195f68cc94d988f2aa50b4d190ee52a.tar.gz | |
xics-kvm: Support for in-kernel XICS interrupt controller
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>
Diffstat (limited to 'linux-headers')
0 files changed, 0 insertions, 0 deletions