[PATCH v2 3/6] x86/asm: remove HAVE_AS_INVPCID

[dmkhn@xxxxxxxxx]

From: Denis Mukhin <dmukhin@xxxxxxxx>

The new toolchain baseline knows the invpcid instruction,
no need to carry the workaround in the code.

Resolves: https://gitlab.com/xen-project/xen/-/work_items/209
Signed-off-by: Denis Mukhin <dmukhin@xxxxxxxx>
---
 xen/arch/x86/arch.mk               |  1 -
 xen/arch/x86/include/asm/invpcid.h | 12 +-----------
 2 files changed, 1 insertion(+), 12 deletions(-)

diff --git a/xen/arch/x86/arch.mk b/xen/arch/x86/arch.mk
index 6d2876b1a8..dcc8c3c330 100644
--- a/xen/arch/x86/arch.mk
+++ b/xen/arch/x86/arch.mk
@@ -16,7 +16,6 @@ $(call as-option-add,CFLAGS,CC,"xsaveopt 
(%rax)",-DHAVE_AS_XSAVEOPT)
 $(call as-option-add,CFLAGS,CC,"rdseed %eax",-DHAVE_AS_RDSEED)
 $(call as-option-add,CFLAGS,CC,"clwb (%rax)",-DHAVE_AS_CLWB)
 $(call as-option-add,CFLAGS,CC,".equ \"x\"$(comma)1",-DHAVE_AS_QUOTED_SYM)
-$(call as-option-add,CFLAGS,CC,"invpcid (%rax)$(comma)%rax",-DHAVE_AS_INVPCID)
 $(call as-option-add,CFLAGS,CC,"movdiri %rax$(comma)(%rax)",-DHAVE_AS_MOVDIR)
 $(call as-option-add,CFLAGS,CC,"enqcmd (%rax)$(comma)%rax",-DHAVE_AS_ENQCMD)
 
diff --git a/xen/arch/x86/include/asm/invpcid.h 
b/xen/arch/x86/include/asm/invpcid.h
index bf5c30313a..e116a34a6c 100644
--- a/xen/arch/x86/include/asm/invpcid.h
+++ b/xen/arch/x86/include/asm/invpcid.h
@@ -5,9 +5,6 @@
 
 extern bool use_invpcid;
 
-#define INVPCID_OPCODE ".byte 0x66, 0x0f, 0x38, 0x82\n"
-#define MODRM_ECX_01   ".byte 0x01\n"
-
 static inline void invpcid(unsigned int pcid, unsigned long addr,
                            unsigned int type)
 {
@@ -17,16 +14,9 @@ static inline void invpcid(unsigned int pcid, unsigned long 
addr,
         uint64_t addr;
     } desc = { .pcid = pcid, .addr = addr };
 
-    asm volatile (
-#ifdef HAVE_AS_INVPCID
-                  "invpcid %[desc], %q[type]"
+    asm volatile ( "invpcid %[desc], %q[type]"
                   : /* No output */
                   : [desc] "m" (desc), [type] "r" (type)
-#else
-                  INVPCID_OPCODE MODRM_ECX_01
-                  : /* No output */
-                  : "a" (type), "c" (&desc)
-#endif
                   : "memory" );
 }
 
-- 
2.34.1