[PATCH v6 for Xen 4.7 2/4] libxc: enable per-VCPU parameter settings for RTDS scheduler

[Chong Li <lichong659@gmail.com>]

Add xc_sched_rtds_vcpu_get/set functions to interact with
Xen to get/set a domain's per-VCPU parameters.

Signed-off-by: Chong Li <chong.li@wustl.edu>
Signed-off-by: Meng Xu <mengxu@cis.upenn.edu>
Signed-off-by: Sisu Xi <xisisu@gmail.com>

---
Changes on PATCH v5:
1) In xc_sched_rtds_vcpu_get/set, re-issueing the hypercall
if it is preempted.

Changes on PATCH v4:
1) Minor modifications on the function parameters.

Changes on PATCH v2:
1) Minor modifications due to the change of struct xen_domctl_scheduler_op.

CC: <dario.faggioli@citrix.com>
CC: <george.dunlap@eu.citrix.com>
CC: <dgolomb@seas.upenn.edu>
CC: <mengxu@cis.upenn.edu>
CC: <wei.liu2@citrix.com>
CC: <lichong659@gmail.com>
---
 tools/libxc/include/xenctrl.h | 16 +++++++---
 tools/libxc/xc_rt.c           | 68 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 80 insertions(+), 4 deletions(-)

diff --git a/tools/libxc/include/xenctrl.h b/tools/libxc/include/xenctrl.h
index 01a6dda..9462271 100644
--- a/tools/libxc/include/xenctrl.h
+++ b/tools/libxc/include/xenctrl.h
@@ -888,11 +888,19 @@ int xc_sched_credit2_domain_get(xc_interface *xch,
                                struct xen_domctl_sched_credit2 *sdom);
 
 int xc_sched_rtds_domain_set(xc_interface *xch,
-                            uint32_t domid,
-                            struct xen_domctl_sched_rtds *sdom);
+                               uint32_t domid,
+                               struct xen_domctl_sched_rtds *sdom);
 int xc_sched_rtds_domain_get(xc_interface *xch,
-                            uint32_t domid,
-                            struct xen_domctl_sched_rtds *sdom);
+                               uint32_t domid,
+                               struct xen_domctl_sched_rtds *sdom);
+int xc_sched_rtds_vcpu_set(xc_interface *xch,
+                               uint32_t domid,
+                               struct xen_domctl_schedparam_vcpu *vcpus,
+                               uint32_t num_vcpus);
+int xc_sched_rtds_vcpu_get(xc_interface *xch,
+                               uint32_t domid,
+                               struct xen_domctl_schedparam_vcpu *vcpus,
+                               uint32_t num_vcpus);
 
 int
 xc_sched_arinc653_schedule_set(
diff --git a/tools/libxc/xc_rt.c b/tools/libxc/xc_rt.c
index d59e5ce..4be9624 100644
--- a/tools/libxc/xc_rt.c
+++ b/tools/libxc/xc_rt.c
@@ -62,3 +62,71 @@ int xc_sched_rtds_domain_get(xc_interface *xch,
 
     return rc;
 }
+
+int xc_sched_rtds_vcpu_set(xc_interface *xch,
+                           uint32_t domid,
+                           struct xen_domctl_schedparam_vcpu *vcpus,
+                           uint32_t num_vcpus)
+{
+    int rc = 0;
+    unsigned processed = 0;
+    DECLARE_DOMCTL;
+    DECLARE_HYPERCALL_BOUNCE(vcpus, sizeof(*vcpus) * num_vcpus,
+            XC_HYPERCALL_BUFFER_BOUNCE_IN);
+
+    if ( xc_hypercall_bounce_pre(xch, vcpus) )
+        return -1;
+
+    domctl.cmd = XEN_DOMCTL_scheduler_op;
+    domctl.domain = (domid_t) domid;
+    domctl.u.scheduler_op.sched_id = XEN_SCHEDULER_RTDS;
+    domctl.u.scheduler_op.cmd = XEN_DOMCTL_SCHEDOP_putvcpuinfo;
+
+    while ( processed < num_vcpus )
+    {
+        domctl.u.scheduler_op.u.v.nr_vcpus = num_vcpus - processed;
+        set_xen_guest_handle_offset(domctl.u.scheduler_op.u.v.vcpus, vcpus,
+                                    processed);
+        if ( (rc = do_domctl(xch, &domctl)) != 0 )
+            break;
+        processed += domctl.u.scheduler_op.u.v.nr_vcpus;
+    }
+
+    xc_hypercall_bounce_post(xch, vcpus);
+
+    return rc;
+}
+
+int xc_sched_rtds_vcpu_get(xc_interface *xch,
+                           uint32_t domid,
+                           struct xen_domctl_schedparam_vcpu *vcpus,
+                           uint32_t num_vcpus)
+{
+    int rc;
+    unsigned processed = 0;
+    DECLARE_DOMCTL;
+    DECLARE_HYPERCALL_BOUNCE(vcpus, sizeof(*vcpus) * num_vcpus,
+            XC_HYPERCALL_BUFFER_BOUNCE_BOTH);
+
+    if ( xc_hypercall_bounce_pre(xch, vcpus) )
+        return -1;
+
+    domctl.cmd = XEN_DOMCTL_scheduler_op;
+    domctl.domain = (domid_t) domid;
+    domctl.u.scheduler_op.sched_id = XEN_SCHEDULER_RTDS;
+    domctl.u.scheduler_op.cmd = XEN_DOMCTL_SCHEDOP_getvcpuinfo;
+
+    while ( processed < num_vcpus )
+    {
+        domctl.u.scheduler_op.u.v.nr_vcpus = num_vcpus - processed;
+        set_xen_guest_handle_offset(domctl.u.scheduler_op.u.v.vcpus, vcpus,
+                                    processed);
+        if ( (rc = do_domctl(xch, &domctl)) != 0 )
+            break;
+        processed += domctl.u.scheduler_op.u.v.nr_vcpus;
+    }
+
+    xc_hypercall_bounce_post(xch, vcpus);
+
+    return rc;
+}
-- 
1.9.1


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