[tip: x86/microcode] x86/microcode/intel: Use a reserved field for metasize

[tip-bot2 for Jithu Joseph]

The following commit has been merged into the x86/microcode branch of tip:

Commit-ID:     28377e56ed22ecce60260eb8afdf0c9837b3505f
Gitweb:        https://git.kernel.org/tip/28377e56ed22ecce60260eb8afdf0c9837b3505f
Author:        Jithu Joseph <jithu.joseph@xxxxxxxxx>
AuthorDate:    Wed, 16 Nov 2022 19:59:28 -08:00
Committer:     Borislav Petkov <bp@xxxxxxx>
CommitterDate: Fri, 18 Nov 2022 22:10:12 +01:00

x86/microcode/intel: Use a reserved field for metasize

Intel is using microcode file format for IFS test images too.

IFS test images use one of the existing reserved fields in microcode
header to indicate the size of the region in the file allocated for
metadata structures.

In preparation for this, rename first of the existing reserved fields
in microcode header to metasize. In subsequent patches IFS specific
code will make use of this field while parsing IFS images.

Signed-off-by: Jithu Joseph <jithu.joseph@xxxxxxxxx>
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Reviewed-by: Tony Luck <tony.luck@xxxxxxxxx>
Reviewed-by: Ashok Raj <ashok.raj@xxxxxxxxx>
Reviewed-by: Sohil Mehta <sohil.mehta@xxxxxxxxx>
Link: https://lore.kernel.org/r/20221117035935.4136738-10-jithu.joseph@xxxxxxxxx
---
 arch/x86/include/asm/microcode_intel.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/microcode_intel.h b/arch/x86/include/asm/microcode_intel.h
index 2a999bf..6af1e70 100644
--- a/arch/x86/include/asm/microcode_intel.h
+++ b/arch/x86/include/asm/microcode_intel.h
@@ -14,7 +14,8 @@ struct microcode_header_intel {
 	unsigned int            pf;
 	unsigned int            datasize;
 	unsigned int            totalsize;
-	unsigned int            reserved[3];
+	unsigned int            metasize;
+	unsigned int            reserved[2];
 };
 
 struct microcode_intel {