[PATCH 03/21] libs/guest: introduce xc_cpu_policy_t

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

Introduce an opaque type that is used to store the CPUID and MSRs
policies of a domain. Such type uses the existing cpu_policy structure
to store the data, but doesn't expose the type to the users of the
xenguest library.

Introduce an allocation (init) and freeing function (destroy) to
manage the type.

Note the type is not yet used anywhere.

Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
 tools/include/xenctrl.h         |  6 ++++++
 tools/libs/guest/xg_cpuid_x86.c | 28 ++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/tools/include/xenctrl.h b/tools/include/xenctrl.h
index e91ff92b9b1..ffb3024bfeb 100644
--- a/tools/include/xenctrl.h
+++ b/tools/include/xenctrl.h
@@ -2590,6 +2590,12 @@ int xc_psr_get_domain_data(xc_interface *xch, uint32_t 
domid,
 int xc_psr_get_hw_info(xc_interface *xch, uint32_t socket,
                        xc_psr_feat_type type, xc_psr_hw_info *hw_info);
 
+typedef struct cpu_policy *xc_cpu_policy_t;
+
+/* Create and free a xc_cpu_policy object. */
+xc_cpu_policy_t xc_cpu_policy_init(void);
+void xc_cpu_policy_destroy(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,
                           uint32_t *nr_features, uint32_t *featureset);
diff --git a/tools/libs/guest/xg_cpuid_x86.c b/tools/libs/guest/xg_cpuid_x86.c
index 9846f81e1f1..ade5281c178 100644
--- a/tools/libs/guest/xg_cpuid_x86.c
+++ b/tools/libs/guest/xg_cpuid_x86.c
@@ -659,3 +659,31 @@ out:
 
     return rc;
 }
+
+xc_cpu_policy_t xc_cpu_policy_init(void)
+{
+    xc_cpu_policy_t policy = calloc(1, sizeof(*policy));
+
+    if ( !policy )
+        return NULL;
+
+    policy->cpuid = calloc(1, sizeof(*policy->cpuid));
+    policy->msr = calloc(1, sizeof(*policy->msr));
+    if ( !policy->cpuid || !policy->msr )
+    {
+        xc_cpu_policy_destroy(policy);
+        return NULL;
+    }
+
+    return policy;
+}
+
+void xc_cpu_policy_destroy(xc_cpu_policy_t policy)
+{
+    if ( !policy )
+        return;
+
+    free(policy->cpuid);
+    free(policy->msr);
+    free(policy);
+}
-- 
2.30.1