[xen stable-4.16] x86/sysctl: Retrofit XEN_SYSCTL_cpu_featureset_{pv,hvm}_max

[patchbot@xxxxxxx]

commit 620f413ecfee7a4c5ad9c94d367c57c80815606f
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Fri Mar 10 19:37:56 2023 +0000
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Tue Aug 8 16:02:53 2023 +0100

    x86/sysctl: Retrofit XEN_SYSCTL_cpu_featureset_{pv,hvm}_max
    
    Featuresets are supposed to be disappearing when the CPU policy 
infrastructure
    is complete, but that has taken longer than expected, and isn't going to be
    complete imminently either.
    
    In the meantime, Xen does have proper default/max featuresets, and xen-cpuid
    can even get them via the XEN_SYSCTL_cpu_policy_* interface, but only knows
    now to render them nicely via the featureset interface.
    
    Differences between default and max are a frequent source of errors,
    frequently too in secret leading up to an embargo, so extend the featureset
    sysctl to allow xen-cpuid to render them all nicely.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Christian Lindig <christian.lindig@xxxxxxxxx>
    (cherry picked from commit 433d012c6c2737ad5a9aaa994355a4140d601852)
---
 tools/misc/xen-cpuid.c          | 10 ++++++----
 tools/ocaml/libs/xc/xenctrl.ml  |  8 +++++++-
 tools/ocaml/libs/xc/xenctrl.mli |  8 +++++++-
 xen/arch/x86/sysctl.c           |  4 +++-
 xen/include/public/sysctl.h     |  2 ++
 5 files changed, 25 insertions(+), 7 deletions(-)

diff --git a/tools/misc/xen-cpuid.c b/tools/misc/xen-cpuid.c
index 648751fb5e..ec6eff9b77 100644
--- a/tools/misc/xen-cpuid.c
+++ b/tools/misc/xen-cpuid.c
@@ -239,10 +239,12 @@ static const struct {
 #define COL_ALIGN "18"
 
 static const char *const fs_names[] = {
-    [XEN_SYSCTL_cpu_featureset_host] = "Host",
-    [XEN_SYSCTL_cpu_featureset_raw]  = "Raw",
-    [XEN_SYSCTL_cpu_featureset_pv]   = "PV",
-    [XEN_SYSCTL_cpu_featureset_hvm]  = "HVM",
+    [XEN_SYSCTL_cpu_featureset_raw]     = "Raw",
+    [XEN_SYSCTL_cpu_featureset_host]    = "Host",
+    [XEN_SYSCTL_cpu_featureset_pv]      = "PV Default",
+    [XEN_SYSCTL_cpu_featureset_hvm]     = "HVM Default",
+    [XEN_SYSCTL_cpu_featureset_pv_max]  = "PV Max",
+    [XEN_SYSCTL_cpu_featureset_hvm_max] = "HVM Max",
 };
 
 static void dump_leaf(uint32_t leaf, const char *const *strs)
diff --git a/tools/ocaml/libs/xc/xenctrl.ml b/tools/ocaml/libs/xc/xenctrl.ml
index b40c70d33f..f4f408a77b 100644
--- a/tools/ocaml/libs/xc/xenctrl.ml
+++ b/tools/ocaml/libs/xc/xenctrl.ml
@@ -299,7 +299,13 @@ external version_changeset: handle -> string = 
"stub_xc_version_changeset"
 external version_capabilities: handle -> string =
   "stub_xc_version_capabilities"
 
-type featureset_index = Featureset_raw | Featureset_host | Featureset_pv | 
Featureset_hvm
+type featureset_index =
+  | Featureset_raw
+  | Featureset_host
+  | Featureset_pv
+  | Featureset_hvm
+  | Featureset_pv_max
+  | Featureset_hvm_max
 external get_cpu_featureset : handle -> featureset_index -> int64 array = 
"stub_xc_get_cpu_featureset"
 
 external watchdog : handle -> int -> int32 -> int
diff --git a/tools/ocaml/libs/xc/xenctrl.mli b/tools/ocaml/libs/xc/xenctrl.mli
index d1d9c9247a..5388fccd1f 100644
--- a/tools/ocaml/libs/xc/xenctrl.mli
+++ b/tools/ocaml/libs/xc/xenctrl.mli
@@ -225,7 +225,13 @@ external version_changeset : handle -> string = 
"stub_xc_version_changeset"
 external version_capabilities : handle -> string
   = "stub_xc_version_capabilities"
 
-type featureset_index = Featureset_raw | Featureset_host | Featureset_pv | 
Featureset_hvm
+type featureset_index =
+  | Featureset_raw
+  | Featureset_host
+  | Featureset_pv
+  | Featureset_hvm
+  | Featureset_pv_max
+  | Featureset_hvm_max
 external get_cpu_featureset : handle -> featureset_index -> int64 array = 
"stub_xc_get_cpu_featureset"
 
 external pages_to_kib : int64 -> int64 = "stub_pages_to_kib"
diff --git a/xen/arch/x86/sysctl.c b/xen/arch/x86/sysctl.c
index ff843eaee2..d6ac3069ed 100644
--- a/xen/arch/x86/sysctl.c
+++ b/xen/arch/x86/sysctl.c
@@ -327,14 +327,16 @@ long arch_do_sysctl(
 
     case XEN_SYSCTL_get_cpu_featureset:
     {
-        static const struct cpuid_policy *const policy_table[4] = {
+        static const struct cpuid_policy *const policy_table[6] = {
             [XEN_SYSCTL_cpu_featureset_raw]  = &raw_cpuid_policy,
             [XEN_SYSCTL_cpu_featureset_host] = &host_cpuid_policy,
 #ifdef CONFIG_PV
             [XEN_SYSCTL_cpu_featureset_pv]   = &pv_def_cpuid_policy,
+            [XEN_SYSCTL_cpu_featureset_pv_max] = &pv_max_cpuid_policy,
 #endif
 #ifdef CONFIG_HVM
             [XEN_SYSCTL_cpu_featureset_hvm]  = &hvm_def_cpuid_policy,
+            [XEN_SYSCTL_cpu_featureset_hvm_max] = &hvm_max_cpuid_policy,
 #endif
         };
         const struct cpuid_policy *p = NULL;
diff --git a/xen/include/public/sysctl.h b/xen/include/public/sysctl.h
index b0a4af8789..d09481f9c8 100644
--- a/xen/include/public/sysctl.h
+++ b/xen/include/public/sysctl.h
@@ -811,6 +811,8 @@ struct xen_sysctl_cpu_featureset {
 #define XEN_SYSCTL_cpu_featureset_host     1
 #define XEN_SYSCTL_cpu_featureset_pv       2
 #define XEN_SYSCTL_cpu_featureset_hvm      3
+#define XEN_SYSCTL_cpu_featureset_pv_max   4
+#define XEN_SYSCTL_cpu_featureset_hvm_max  5
     uint32_t index;       /* IN: Which featureset to query? */
     uint32_t nr_features; /* IN/OUT: Number of entries in/written to
                            * 'features', or the maximum number of features if
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.16