x86/microcode/intel: Do not retry microcode reloading on the APs

mainline inclusion
from mainline-v6.2-rc1
commit be1b670f
category: feature
feature: Backport Intel In Field Scan(IFS) multi-blob images support
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I6L337
CVE: N/A
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/
commit/?id=be1b670f

Intel-SIG: commit be1b670f ("x86/microcode/intel: Do not retry microcode reloading on the APs")

-------------------------------------

x86/microcode/intel: Do not retry microcode reloading on the APs

The retries in load_ucode_intel_ap() were in place to support systems
with mixed steppings. Mixed steppings are no longer supported and there is
only one microcode image at a time. Any retries will simply reattempt to
apply the same image over and over without making progress.

  [ bp: Zap the circumstantial reasoning from the commit message. ]

Fixes: 06b8534c ("x86/microcode: Rework microcode loading")
Signed-off-by: NAshok Raj <ashok.raj@intel.com>
Signed-off-by: NBorislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: NThomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20221129210832.107850-3-ashok.raj@intel.comSigned-off-by: NAichun Shi <aichun.shi@intel.com>

arch/x86/kernel/cpu/microcode/intel.c

@@ -488,7 +488,6 @@ void load_ucode_intel_ap(void)
 	else
 		iup = &intel_ucode_patch;
 
-reget:
 	if (!*iup) {
 		patch = __load_ucode_intel(&uci);
 		if (!patch)
@@ -499,12 +498,7 @@ void load_ucode_intel_ap(void)
 
 	uci.mc = *iup;
 
-	if (apply_microcode_early(&uci, true)) {
-		/* Mixed-silicon system? Try to refetch the proper patch: */
-		*iup = NULL;
-
-		goto reget;
-	}
+	apply_microcode_early(&uci, true);
 }
 
 static struct microcode_intel *find_patch(struct ucode_cpu_info *uci)