[Xen-devel] [PATCH 4/7] x86/ucode/intel: Reimplement get_{data, total}size() helpers

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

Every caller actually passes a struct microcode_header_intel.  Implement the
helpers with proper types, and leave a comment explaining the Pentium Pro/II
behaviour with empty {data,total}size fields.

No functional change.

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Jan Beulich <JBeulich@xxxxxxxx>
CC: Wei Liu <wl@xxxxxxx>
CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
 xen/arch/x86/cpu/microcode/intel.c | 32 ++++++++++++++++++++------------
 1 file changed, 20 insertions(+), 12 deletions(-)

diff --git a/xen/arch/x86/cpu/microcode/intel.c 
b/xen/arch/x86/cpu/microcode/intel.c
index 0cceac6255..dfe44679be 100644
--- a/xen/arch/x86/cpu/microcode/intel.c
+++ b/xen/arch/x86/cpu/microcode/intel.c
@@ -46,9 +46,16 @@ struct microcode_header_intel {
     unsigned int sig;
     unsigned int cksum;
     unsigned int ldrver;
+
+    /*
+     * Microcode for the Pentium Pro and II had all further fields in the
+     * header reserved, had a fixed datasize of 2000 and totalsize of 2048,
+     * and didn't use platform flags despite the availability of the MSR.
+     */
+
     unsigned int pf;
-    unsigned int datasize;
-    unsigned int totalsize;
+    unsigned int _datasize;
+    unsigned int _totalsize;
     unsigned int reserved[3];
 };
 
@@ -75,20 +82,21 @@ struct microcode_patch {
     struct microcode_intel *mc_intel;
 };
 
-#define DEFAULT_UCODE_DATASIZE  (2000)
+#define PPRO_UCODE_DATASIZE     2000
 #define MC_HEADER_SIZE          (sizeof(struct microcode_header_intel))
-#define DEFAULT_UCODE_TOTALSIZE (DEFAULT_UCODE_DATASIZE + MC_HEADER_SIZE)
 #define EXT_HEADER_SIZE         (sizeof(struct extended_sigtable))
 #define EXT_SIGNATURE_SIZE      (sizeof(struct extended_signature))
 #define DWSIZE                  (sizeof(u32))
-#define get_totalsize(mc) \
-        (((struct microcode_intel *)mc)->hdr.totalsize ? \
-         ((struct microcode_intel *)mc)->hdr.totalsize : \
-         DEFAULT_UCODE_TOTALSIZE)
-
-#define get_datasize(mc) \
-        (((struct microcode_intel *)mc)->hdr.datasize ? \
-         ((struct microcode_intel *)mc)->hdr.datasize : DEFAULT_UCODE_DATASIZE)
+
+static uint32_t get_datasize(const struct microcode_header_intel *hdr)
+{
+    return hdr->_datasize ?: PPRO_UCODE_DATASIZE;
+}
+
+static uint32_t get_totalsize(const struct microcode_header_intel *hdr)
+{
+    return hdr->_totalsize ?: PPRO_UCODE_DATASIZE + MC_HEADER_SIZE;
+}
 
 #define sigmatch(s1, s2, p1, p2) \
         (((s1) == (s2)) && (((p1) & (p2)) || (((p1) == 0) && ((p2) == 0))))
-- 
2.11.0


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