[PATCH 05/21] libs/guest: introduce helper to fetch a domain cpu policy

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

Such helper is based on the existing functions to fetch a CPUID and
MSR policies, but uses the xc_cpu_policy_t type to return the data to
the caller.

No user of the interface introduced on the patch.

Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
 tools/include/xenctrl.h         |  2 ++
 tools/libs/guest/xg_cpuid_x86.c | 34 +++++++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/tools/include/xenctrl.h b/tools/include/xenctrl.h
index fc8e4b28781..8b8b30a2764 100644
--- a/tools/include/xenctrl.h
+++ b/tools/include/xenctrl.h
@@ -2599,6 +2599,8 @@ void xc_cpu_policy_destroy(xc_cpu_policy_t policy);
 /* Retrieve a system policy, or get/set a domains policy. */
 int xc_cpu_policy_get_system(xc_interface *xch, unsigned int idx,
                              xc_cpu_policy_t policy);
+int xc_cpu_policy_get_domain(xc_interface *xch, uint32_t domid,
+                             xc_cpu_policy_t policy);
 
 int xc_get_cpu_levelling_caps(xc_interface *xch, uint32_t *caps);
 int xc_get_cpu_featureset(xc_interface *xch, uint32_t index,
diff --git a/tools/libs/guest/xg_cpuid_x86.c b/tools/libs/guest/xg_cpuid_x86.c
index 3710fb63839..75ac70996ac 100644
--- a/tools/libs/guest/xg_cpuid_x86.c
+++ b/tools/libs/guest/xg_cpuid_x86.c
@@ -777,3 +777,37 @@ int xc_cpu_policy_get_system(xc_interface *xch, unsigned 
int idx,
     free(msrs);
     return rc;
 }
+
+int xc_cpu_policy_get_domain(xc_interface *xch, uint32_t domid,
+                             xc_cpu_policy_t policy)
+{
+    unsigned int nr_leaves, nr_msrs;
+    xen_cpuid_leaf_t *leaves = NULL;
+    xen_msr_entry_t *msrs = NULL;
+    int rc;
+
+    rc = allocate_buffers(xch, &nr_leaves, &leaves, &nr_msrs, &msrs);
+    if ( rc )
+    {
+        errno = -rc;
+        return -1;
+    }
+
+    rc = xc_get_domain_cpu_policy(xch, domid, &nr_leaves, leaves, &nr_msrs,
+                                  msrs);
+    if ( rc )
+    {
+        PERROR("Failed to obtain domain %u policy", domid);
+        rc = -1;
+        goto out;
+    }
+
+    rc = deserialize_policy(xch, policy, nr_leaves, leaves, nr_msrs, msrs);
+    if ( rc )
+        errno = -rc;
+
+ out:
+    free(leaves);
+    free(msrs);
+    return rc;
+}
-- 
2.30.1