x86/fpu: Move mxcsr related code to core

mainline inclusion
from mainline-v5.16-rc1
commit d9d005f3
category: feature
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I590ZC
CVE: NA

Intel-SIG: commit d9d005f3 x86/fpu: Move mxcsr related code to core.

--------------------------------

No need to expose that to code which only needs the XCR0 accessors.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Signed-off-by: NBorislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20211015011539.740012411@linutronix.deSigned-off-by: NLin Wang <lin.x.wang@intel.com>

arch/x86/include/asm/fpu/xcr.h

@@ -2,17 +2,6 @@
 #ifndef _ASM_X86_FPU_XCR_H
 #define _ASM_X86_FPU_XCR_H
 
-/*
- * MXCSR and XCR definitions:
- */
-
-static inline void ldmxcsr(u32 mxcsr)
-{
-	asm volatile("ldmxcsr %0" :: "m" (mxcsr));
-}
-
-extern unsigned int mxcsr_feature_mask;
-
 #define XCR_XFEATURE_ENABLED_MASK	0x00000000
 
 static inline u64 xgetbv(u32 index)

arch/x86/kernel/fpu/init.c

@@ -11,6 +11,7 @@
 #include <linux/init.h>
 
 #include "internal.h"
+#include "legacy.h"
 
 /*
  * Initialize the registers found in all CPUs, CR0 and CR4:

arch/x86/kernel/fpu/legacy.h

@@ -4,6 +4,13 @@
 
 #include <asm/fpu/types.h>
 
+extern unsigned int mxcsr_feature_mask;
+
+static inline void ldmxcsr(u32 mxcsr)
+{
+	asm volatile("ldmxcsr %0" :: "m" (mxcsr));
+}
+
 /*
  * Returns 0 on success or the trap number when the operation raises an
  * exception.

arch/x86/kernel/fpu/regset.c

@@ -12,6 +12,7 @@
 
 #include "context.h"
 #include "internal.h"
+#include "legacy.h"
 
 /*
  * The xstateregs_active() routine is the same as the regset_fpregs_active() routine,

arch/x86/kernel/fpu/xstate.c

@@ -14,8 +14,9 @@
 
 #include <asm/fpu/api.h>
 #include <asm/fpu/internal.h>
-#include <asm/fpu/signal.h>
 #include <asm/fpu/regset.h>
+#include <asm/fpu/signal.h>
+#include <asm/fpu/xcr.h>
 
 #include <asm/tlbflush.h>
 

arch/x86/kvm/svm/sev.c

@@ -16,6 +16,7 @@
 #include <linux/swap.h>
 
 #include <asm/pkru.h>
+#include <asm/fpu/xcr.h>
 
 #include "x86.h"
 #include "svm.h"