[xen staging] x86/amd: only call setup_force_cpu_cap for boot CPU

[patchbot@xxxxxxx]

commit 31b41ce858c8bd5159212d40969f8e0b7124bbf0
Author:     Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
AuthorDate: Thu Aug 11 17:44:26 2022 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Aug 11 17:44:26 2022 +0200

    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@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/cpu/amd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/cpu/amd.c b/xen/arch/x86/cpu/amd.c
index 29c59bcba4..d5f8e5e899 100644
--- a/xen/arch/x86/cpu/amd.c
+++ b/xen/arch/x86/cpu/amd.c
@@ -845,7 +845,7 @@ static void cf_check init_amd(struct cpuinfo_x86 *c)
         * 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)
--
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