From 84690fb82c4f4aecb72a6789d8994efa74841e09 Mon Sep 17 00:00:00 2001
Message-ID: <84690fb82c4f4aecb72a6789d8994efa74841e09.1695733540.git.m.a.young@durham.ac.uk>
In-Reply-To: <d2d2dcae879c6cc05227c9620f0a772f35fe6886.1695733540.git.m.a.young@durham.ac.uk>
References: <d2d2dcae879c6cc05227c9620f0a772f35fe6886.1695733540.git.m.a.young@durham.ac.uk>
From: Andrew Cooper <andrew.cooper3@citrix.com>
Date: Tue, 12 Sep 2023 17:03:16 +0100
Subject: [XEN PATCH 03/10] x86/spec-ctrl: Fold DO_SPEC_CTRL_EXIT_TO_XEN into
 it's single user

With the SPEC_CTRL_EXIT_TO_XEN{,_IST} confusion fixed, it's now obvious that
there's only a single EXIT_TO_XEN path.  Fold DO_SPEC_CTRL_EXIT_TO_XEN into
SPEC_CTRL_EXIT_TO_XEN to simplify further fixes.

When merging labels, switch the name to .L\@_skip_sc_msr as "skip" on its own
is going to be too generic shortly.

No functional change.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
(cherry picked from commit 694bb0f280fd08a4377e36e32b84b5062def4de2)
---
 xen/arch/x86/include/asm/spec_ctrl_asm.h | 40 ++++++++++--------------
 1 file changed, 16 insertions(+), 24 deletions(-)

diff --git a/xen/arch/x86/include/asm/spec_ctrl_asm.h b/xen/arch/x86/include/asm/spec_ctrl_asm.h
index e8fd01243c..d5f65d80ea 100644
--- a/xen/arch/x86/include/asm/spec_ctrl_asm.h
+++ b/xen/arch/x86/include/asm/spec_ctrl_asm.h
@@ -211,27 +211,6 @@
     wrmsr
 .endm
 
-.macro DO_SPEC_CTRL_EXIT_TO_XEN
-/*
- * Requires %rbx=stack_end
- * Clobbers %rax, %rcx, %rdx
- *
- * When returning to Xen context, look to see whether SPEC_CTRL shadowing is
- * in effect, and reload the shadow value.  This covers race conditions which
- * exist with an NMI/MCE/etc hitting late in the return-to-guest path.
- */
-    xor %edx, %edx
-
-    testb $SCF_use_shadow, STACK_CPUINFO_FIELD(spec_ctrl_flags)(%rbx)
-    jz .L\@_skip
-
-    mov STACK_CPUINFO_FIELD(shadow_spec_ctrl)(%rbx), %eax
-    mov $MSR_SPEC_CTRL, %ecx
-    wrmsr
-
-.L\@_skip:
-.endm
-
 .macro DO_SPEC_CTRL_EXIT_TO_GUEST
 /*
  * Requires %eax=spec_ctrl, %rsp=regs/cpuinfo
@@ -340,11 +319,24 @@ UNLIKELY_DISPATCH_LABEL(\@_serialise):
  * Clobbers %rax, %rcx, %rdx
  */
     testb $SCF_ist_sc_msr, STACK_CPUINFO_FIELD(spec_ctrl_flags)(%rbx)
-    jz .L\@_skip
+    jz .L\@_skip_sc_msr
 
-    DO_SPEC_CTRL_EXIT_TO_XEN
+    /*
+     * When returning to Xen context, look to see whether SPEC_CTRL shadowing
+     * is in effect, and reload the shadow value.  This covers race conditions
+     * which exist with an NMI/MCE/etc hitting late in the return-to-guest
+     * path.
+     */
+    xor %edx, %edx
 
-.L\@_skip:
+    testb $SCF_use_shadow, STACK_CPUINFO_FIELD(spec_ctrl_flags)(%rbx)
+    jz .L\@_skip_sc_msr
+
+    mov STACK_CPUINFO_FIELD(shadow_spec_ctrl)(%rbx), %eax
+    mov $MSR_SPEC_CTRL, %ecx
+    wrmsr
+
+.L\@_skip_sc_msr:
 .endm
 
 #endif /* __ASSEMBLY__ */
-- 
2.41.0