[xen staging-4.14] x86/S3: fix shadow stack resume path

[patchbot@xxxxxxx]

commit 0521dc918eb196b6479da35a4d0311d829fb0aca
Author:     Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
AuthorDate: Tue Oct 20 14:42:16 2020 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Oct 20 14:42:16 2020 +0200

    x86/S3: fix shadow stack resume path
    
    Fix the resume path to load the shadow stack pointer from saved_ssp (not
    saved_rsp), to match what suspend path does.
    
    Fixes: 633ecc4a7cb2 ("x86/S3: Save and restore Shadow Stack configuration")
    Backport: 4.14
    Signed-off-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
    master commit: 4bdbf746ac9152e70f264f87db4472707da805ce
    master date: 2020-09-28 10:43:10 +0200
---
 xen/arch/x86/acpi/wakeup_prot.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/acpi/wakeup_prot.S b/xen/arch/x86/acpi/wakeup_prot.S
index a2c41c4f3f..c6b3fcc93d 100644
--- a/xen/arch/x86/acpi/wakeup_prot.S
+++ b/xen/arch/x86/acpi/wakeup_prot.S
@@ -69,7 +69,7 @@ ENTRY(s3_resume)
          * so SETSSBSY will successfully load a value useful for us, then
          * reset MSR_PL0_SSP to its usual value and pop the temporary token.
          */
-        mov     saved_rsp(%rip), %rdi
+        mov     saved_ssp(%rip), %rdi
         cmpq    $1, %rdi
         je      .L_shstk_done
 
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