Xen core parking 1: hypercall
This patch implement hypercall through which dom0 send core parking request, and
get core parking result.
Due to the characteristic of continue_hypercall_on_cpu, dom0 seperately send/get
core parking request/result.
Signed-off-by: Liu, Jinsong <jinsong.liu@intel.com>
diff -r 92e03310878f xen/arch/x86/platform_hypercall.c
--- a/xen/arch/x86/platform_hypercall.c Wed Feb 08 21:05:52 2012 +0800
+++ b/xen/arch/x86/platform_hypercall.c Mon Feb 13 11:33:16 2012 +0800
@@ -56,6 +56,10 @@
long cpu_up_helper(void *data);
long cpu_down_helper(void *data);
+/* from core_parking.c */
+long core_parking_helper(void *data);
+uint32_t get_cur_idle_nums(void);
+
ret_t do_platform_op(XEN_GUEST_HANDLE(xen_platform_op_t) u_xenpf_op)
{
ret_t ret = 0;
@@ -593,6 +597,32 @@
op->u.mem_add.epfn,
op->u.mem_add.pxm);
break;
+
+ case XENPF_core_parking:
+ {
+ uint32_t idle_nums;
+
+ switch(op->u.core_parking.type)
+ {
+ case XEN_CORE_PARKING_SET:
+ idle_nums = min_t(uint32_t,
+ op->u.core_parking.idle_nums, num_present_cpus() - 1);
+ ret = continue_hypercall_on_cpu(
+ 0, core_parking_helper, (void *)(unsigned long)idle_nums);
+ break;
+
+ case XEN_CORE_PARKING_GET:
+ op->u.core_parking.idle_nums = get_cur_idle_nums();
+ ret = copy_to_guest(u_xenpf_op, op, 1) ? -EFAULT : 0;
+ break;
+
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ }
+ break;
+
default:
ret = -ENOSYS;
break;
diff -r 92e03310878f xen/common/Makefile
--- a/xen/common/Makefile Wed Feb 08 21:05:52 2012 +0800
+++ b/xen/common/Makefile Mon Feb 13 11:33:16 2012 +0800
@@ -1,6 +1,7 @@
obj-y += bitmap.o
obj-y += cpu.o
obj-y += cpupool.o
+obj-y += core_parking.o
obj-y += domctl.o
obj-y += domain.o
obj-y += event_channel.o
diff -r 92e03310878f xen/common/core_parking.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/xen/common/core_parking.c Mon Feb 13 11:33:16 2012 +0800
@@ -0,0 +1,13 @@
+#include <xen/types.h>
+
+static uint32_t cur_idle_nums;
+
+long core_parking_helper(void *data)
+{
+ return 0;
+}
+
+uint32_t get_cur_idle_nums(void)
+{
+ return cur_idle_nums;
+}
diff -r 92e03310878f xen/include/public/platform.h
--- a/xen/include/public/platform.h Wed Feb 08 21:05:52 2012 +0800
+++ b/xen/include/public/platform.h Mon Feb 13 11:33:16 2012 +0800
@@ -490,6 +490,20 @@
uint32_t flags;
};
+#define XENPF_core_parking 60
+
+#define XEN_CORE_PARKING_SET 1
+#define XEN_CORE_PARKING_GET 2
+struct xenpf_core_parking {
+ /* IN variables */
+ uint32_t type;
+ /* IN variables: set cpu nums expected to be idled */
+ /* OUT variables: get cpu nums actually be idled */
+ uint32_t idle_nums;
+};
+typedef struct xenpf_core_parking xenpf_core_parking_t;
+DEFINE_XEN_GUEST_HANDLE(xenpf_core_parking_t);
+
struct xen_platform_op {
uint32_t cmd;
uint32_t interface_version; /* XENPF_INTERFACE_VERSION */
@@ -511,6 +525,7 @@
struct xenpf_cpu_ol cpu_ol;
struct xenpf_cpu_hotadd cpu_add;
struct xenpf_mem_hotadd mem_add;
+ struct xenpf_core_parking core_parking;
uint8_t pad[128];
} u;
};