[xen staging] libs/guest: introduce helper to serialize a cpu policy

[patchbot@xxxxxxx]

commit de75c946cfd3d65b4511c970f14e331a54544b12
Author:     Roger Pau Monne <roger.pau@xxxxxxxxxx>
AuthorDate: Wed Mar 17 15:31:50 2021 +0100
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Thu Apr 29 19:27:21 2021 +0100

    libs/guest: introduce helper to serialize a cpu policy
    
    Such helper allow converting a cpu policy into an array of
    xen_cpuid_leaf_t and xen_msr_entry_t elements, which matches the
    current interface of the CPUID/MSR functions. This is required in
    order for the user to be able to parse the CPUID/MSR data.
    
    No user of the interface introduced in this patch.
    
    Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
 tools/include/xenctrl.h         |  5 +++++
 tools/libs/guest/xg_cpuid_x86.c | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/tools/include/xenctrl.h b/tools/include/xenctrl.h
index 34d979d11d..a4827b1ae6 100644
--- a/tools/include/xenctrl.h
+++ b/tools/include/xenctrl.h
@@ -2602,6 +2602,11 @@ int xc_cpu_policy_get_system(xc_interface *xch, unsigned 
int policy_idx,
 int xc_cpu_policy_get_domain(xc_interface *xch, uint32_t domid,
                              xc_cpu_policy_t policy);
 
+/* Manipulate a policy via architectural representations. */
+int xc_cpu_policy_serialise(xc_interface *xch, const xc_cpu_policy_t policy,
+                            xen_cpuid_leaf_t *leaves, uint32_t *nr_leaves,
+                            xen_msr_entry_t *msrs, uint32_t *nr_msrs);
+
 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 2cbc4b550f..03884587b9 100644
--- a/tools/libs/guest/xg_cpuid_x86.c
+++ b/tools/libs/guest/xg_cpuid_x86.c
@@ -762,3 +762,35 @@ int xc_cpu_policy_get_domain(xc_interface *xch, uint32_t 
domid,
 
     return rc;
 }
+
+int xc_cpu_policy_serialise(xc_interface *xch, const xc_cpu_policy_t p,
+                            xen_cpuid_leaf_t *leaves, uint32_t *nr_leaves,
+                            xen_msr_entry_t *msrs, uint32_t *nr_msrs)
+{
+    int rc;
+
+    if ( leaves )
+    {
+        rc = x86_cpuid_copy_to_buffer(&p->cpuid, leaves, nr_leaves);
+        if ( rc )
+        {
+            ERROR("Failed to serialize CPUID policy");
+            errno = -rc;
+            return -1;
+        }
+    }
+
+    if ( msrs )
+    {
+        rc = x86_msr_copy_to_buffer(&p->msr, msrs, nr_msrs);
+        if ( rc )
+        {
+            ERROR("Failed to serialize MSR policy");
+            errno = -rc;
+            return -1;
+        }
+    }
+
+    errno = 0;
+    return 0;
+}
--
generated by git-patchbot for /home/xen/git/xen.git#staging