[xen staging] x86/ucode: Drop the match_reg[] field from AMD's microcode_patch

[patchbot@xxxxxxx]

commit 7463a5b63926db1dbbbae5829919d250c1b0f52c
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Thu Oct 24 13:47:20 2024 +0100
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Wed Feb 26 11:58:55 2025 +0000

    x86/ucode: Drop the match_reg[] field from AMD's microcode_patch
    
    This was true in the K10 days, but even back then the match registers were
    really payload data rather than header data.
    
    But, it's really model specific data, and these days typically part of the
    signature, so is random data for all intents and purposes.
    
    No functional change.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Jason Andryuk <jason.andryuk@xxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/cpu/microcode/amd.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/xen/arch/x86/cpu/microcode/amd.c b/xen/arch/x86/cpu/microcode/amd.c
index 210736f580..9ee455b007 100644
--- a/xen/arch/x86/cpu/microcode/amd.c
+++ b/xen/arch/x86/cpu/microcode/amd.c
@@ -48,7 +48,6 @@ struct microcode_patch {
     uint8_t  sb_rev_id;
     uint8_t  bios_api_rev;
     uint8_t  reserved1[3];
-    uint32_t match_reg[8];
 };
 
 #define UCODE_MAGIC                0x00414d44
--
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