[xen staging] x86/kexec: Separate code and data into different cache lines

[patchbot@xxxxxxx]

commit 41190d2ceb03b12ffc17a66c04de519c26a6052a
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Fri Feb 17 17:01:22 2023 +0000
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Wed Oct 2 19:08:27 2024 +0100

    x86/kexec: Separate code and data into different cache lines
    
    No functional change, but it performs a bit better.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/x86_64/kexec_reloc.S | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/xen/arch/x86/x86_64/kexec_reloc.S 
b/xen/arch/x86/x86_64/kexec_reloc.S
index 9f40c80d7c..50ba454abd 100644
--- a/xen/arch/x86/x86_64/kexec_reloc.S
+++ b/xen/arch/x86/x86_64/kexec_reloc.S
@@ -19,6 +19,7 @@
 #include <xen/kimage.h>
 
 #include <asm/asm_defns.h>
+#include <asm/cache.h>
 #include <asm/msr-index.h>
 #include <asm/page.h>
 #include <asm/machine_kexec.h>
@@ -174,6 +175,9 @@ FUNC_LOCAL(compatibility_mode)
         ud2
 END(compatibility_mode)
 
+        /* Separate code and data into into different cache lines */
+        .balign L1_CACHE_BYTES
+
 DATA_LOCAL(compat_mode_gdt_desc, 4)
         .word .Lcompat_mode_gdt_end - compat_mode_gdt -1
         .quad 0x0000000000000000     /* set in call_32_bit above */
--
generated by git-patchbot for /home/xen/git/xen.git#staging