File 62f523da-AMD-setup_force_cpu_cap-BSP-only.patch of Package xen.27273

# Commit 31b41ce858c8bd5159212d40969f8e0b7124bbf0
# Date 2022-08-11 17:44:26 +0200
# Author Ross Lagerwall <ross.lagerwall@citrix.com>
# Committer Jan Beulich <jbeulich@suse.com>
x86/amd: only call setup_force_cpu_cap for boot CPU

This should only be called for the boot CPU to avoid calling _init code
after it has been unloaded.

Fixes: 062868a5a8b4 ("x86/amd: Work around CLFLUSH ordering on older parts")
Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>

--- a/xen/arch/x86/cpu/amd.c
+++ b/xen/arch/x86/cpu/amd.c
@@ -820,7 +820,7 @@ static void init_amd(struct cpuinfo_x86
 	 * everything, including reads and writes to address, and
 	 * LFENCE/SFENCE instructions.
 	 */
-	if (!cpu_has_clflushopt)
+	if (c == &boot_cpu_data && !cpu_has_clflushopt)
 		setup_force_cpu_cap(X86_BUG_CLFLUSH_MFENCE);
 
 	switch(c->x86)