From: Andrew Cooper <andrew.cooper3@citrix.com>
Date: Tue, 9 Apr 2024 20:39:51 +0000 (+0100)
Subject: x86/entry: Fix build with older toolchains
X-Git-Tag: RELEASE-4.15.7~4
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=ab125048b9ba462ce70b8dceb28c90fcac9675c3;p=xen.git

x86/entry: Fix build with older toolchains

Binutils older than 2.29 doesn't know INCSSPD.

Fixes: 8e186f98ce0e ("x86: Use indirect calls in reset-stack infrastructure")
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
(cherry picked from commit a9fa82500818a8d8ce5f2843f1577bd2c29d088e)
---

diff --git a/xen/arch/x86/x86_64/entry.S b/xen/arch/x86/x86_64/entry.S
index e677071610..968176124f 100644
--- a/xen/arch/x86/x86_64/entry.S
+++ b/xen/arch/x86/x86_64/entry.S
@@ -589,7 +589,9 @@ ENTRY(continue_pv_domain)
          * JMPed to.  Drop the return address.
          */
         add   $8, %rsp
+#ifdef CONFIG_XEN_SHSTK
         ALTERNATIVE "", "mov $2, %eax; incsspd %eax", X86_FEATURE_XEN_SHSTK
+#endif
 
         call  check_wakeup_from_wait
 ret_from_intr: