Am 05.06.2013 09:39, schrieb Alexey Kardashevskiy:
> From: David Gibson <da...@gibson.dropbear.id.au>
>
> 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.
>
> [Mike Qiu <qiud...@linux.vnet.ibm.com>: fixed mistype which caused
> ics_set_kvm_state() to fail]
> Signed-off-by: David Gibson <da...@gibson.dropbear.id.au>
> Signed-off-by: Alexey Kardashevskiy <a...@ozlabs.ru>
If a Mike Qiu changed this patch, don't we require his Signed-off-by?
CPUState usage looks fine, can't judge the kernel interface, two
nitpicks below.
[...]
> diff --git a/hw/ppc/xics.c b/hw/ppc/xics.c
> index 02e44a0..b83f19f 100644
> --- a/hw/ppc/xics.c
> +++ b/hw/ppc/xics.c
> @@ -29,12 +29,19 @@
> #include "trace.h"
> #include "hw/ppc/spapr.h"
> #include "hw/ppc/xics.h"
> +#include "kvm_ppc.h"
> +#include "sysemu/kvm.h"
> +#include "config.h"
> +#include "qemu/config-file.h"
> +
> +#include <sys/ioctl.h>
>
> /*
> * ICP: Presentation layer
> */
>
> struct icp_server_state {
> + CPUState *cs;
> uint32_t xirr;
> uint8_t pending_priority;
> uint8_t mfrr;
> @@ -53,6 +60,9 @@ struct icp_state {
> uint32_t nr_servers;
> struct icp_server_state *ss;
> struct ics_state *ics;
> + uint32_t set_xive_token, get_xive_token,
> + int_off_token, int_on_token;
FWIW normally we place struct fields below each other...
> + int kernel_xics_fd;
> };
>
> static void ics_reject(struct ics_state *ics, int nr);
[...]
> @@ -535,11 +734,14 @@ static int ics_post_load(void *opaque, int version_id)
> return 0;
> }
>
> +
Intentional white space change?
> static const VMStateDescription vmstate_icp_server = {
> .name = "icp/server",
> .version_id = 1,
> .minimum_version_id = 1,
> .minimum_version_id_old = 1,
> + .pre_save = icp_pre_save,
> + .post_load = icp_post_load,
> .fields = (VMStateField []) {
> /* Sanity check */
> VMSTATE_UINT32(xirr, struct icp_server_state),
[snip]
Regards,
Andreas
--
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg
