[PATCH v3 2/8] x86/mce: add compat struct checking for XEN_MC_inject_v2

[Jan Beulich <jbeulich@xxxxxxxx>]

84e364f2eda2 ("x86: add CMCI software injection interface") merely made
sure things would build, without any concern about things actually
working:
- despite the addition of xenctl_bitmap to xlat.lst, the resulting macro
  wasn't invoked anywhere (which would have lead to recognizing that the
  structure appeared to have no fully compatible layout, despite the use
  of a 64-bit handle),
- the interface struct itself was neither added to xlat.lst (and the
  resulting macro then invoked) nor was any manual checking of
  individual fields added.

Adjust compat header generation logic to retain XEN_GUEST_HANDLE_64(),
which is intentionally layed out to be compatible between different size
guests. Invoke the missing checking (implicitly through CHECK_mc).

No change in the resulting generated code.

Fixes: 84e364f2eda2 ("x86: add CMCI software injection interface")
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>

--- a/xen/arch/x86/cpu/mcheck/mce.c
+++ b/xen/arch/x86/cpu/mcheck/mce.c
@@ -1312,10 +1312,12 @@ CHECK_FIELD_(struct, mc_fetch, fetch_id)
 CHECK_FIELD_(struct, mc_physcpuinfo, ncpus);
 # define CHECK_compat_mc_physcpuinfo struct mc_physcpuinfo
 
-#define CHECK_compat_mc_inject_v2   struct mc_inject_v2
+# define xen_ctl_bitmap              xenctl_bitmap
+
 CHECK_mc;
 # undef CHECK_compat_mc_fetch
 # undef CHECK_compat_mc_physcpuinfo
+# undef xen_ctl_bitmap
 
 # define xen_mc_info                 mc_info
 CHECK_mc_info;
--- a/xen/include/public/arch-x86/xen-mca.h
+++ b/xen/include/public/arch-x86/xen-mca.h
@@ -429,6 +429,7 @@ struct xen_mc_inject_v2 {
     uint32_t flags;
     xenctl_bitmap_t cpumap;
 };
+typedef struct xen_mc_inject_v2 xen_mc_inject_v2_t;
 #endif
 
 struct xen_mc {
@@ -441,7 +442,7 @@ struct xen_mc {
         xen_mc_msrinject_t         mc_msrinject;
         xen_mc_mceinject_t         mc_mceinject;
 #if defined(__XEN__) || defined(__XEN_TOOLS__)
-        struct xen_mc_inject_v2    mc_inject_v2;
+        xen_mc_inject_v2_t         mc_inject_v2;
 #endif
     } u;
 };
--- a/xen/include/xlat.lst
+++ b/xen/include/xlat.lst
@@ -44,6 +44,7 @@
 ?      mcinfo_recovery                 arch-x86/xen-mca.h
 !      mc_fetch                        arch-x86/xen-mca.h
 ?      mc_info                         arch-x86/xen-mca.h
+?      mc_inject_v2                    arch-x86/xen-mca.h
 ?      mc_mceinject                    arch-x86/xen-mca.h
 ?      mc_msrinject                    arch-x86/xen-mca.h
 ?      mc_notifydomain                 arch-x86/xen-mca.h
--- a/xen/tools/compat-build-header.py
+++ b/xen/tools/compat-build-header.py
@@ -19,6 +19,7 @@ pats = [
  [ r"(^|[^\w])xen_?(\w*)_compat_t([^\w]|$$)", r"\1compat_\2_t\3" ],
  [ r"(^|[^\w])XEN_?", r"\1COMPAT_" ],
  [ r"(^|[^\w])Xen_?", r"\1Compat_" ],
+ [ r"(^|[^\w])COMPAT_HANDLE_64\(", r"\1XEN_GUEST_HANDLE_64(" ],
  [ r"(^|[^\w])long([^\w]|$$)", r"\1int\2" ]
 ];
 
--- a/xen/tools/compat-build-source.py
+++ b/xen/tools/compat-build-source.py
@@ -10,7 +10,7 @@ pats = [
  [ r"^\s*#\s*define\s+([A-Z_]*_GUEST_HANDLE)", r"#define HIDE_\1" ],
  [ r"^\s*#\s*define\s+([a-z_]*_guest_handle)", r"#define hide_\1" ],
  [ r"^\s*#\s*define\s+(u?int64)_aligned_t\s.*aligned.*", r"typedef \1_T 
__attribute__((aligned(4))) \1_compat_T;" ],
- [ r"XEN_GUEST_HANDLE(_[0-9A-Fa-f]+)?", r"COMPAT_HANDLE" ],
+ [ r"XEN_GUEST_HANDLE", r"COMPAT_HANDLE" ],
 ];
 
 xlatf = open('xlat.lst', 'r')