x86/fpu: Rename all the fpregs, xregs, fxregs and fregs handling functions

Standardize the naming of the various functions that copy register
content in specific FPU context formats:

  copy_fxregs_to_kernel()         # was: fpu_fxsave()
  copy_xregs_to_kernel()          # was: xsave_state()

  copy_kernel_to_fregs()          # was: frstor_checking()
  copy_kernel_to_fxregs()         # was: fxrstor_checking()
  copy_kernel_to_xregs()          # was: fpu_xrstor_checking()
  copy_kernel_to_xregs_booting()  # was: xrstor_state_booting()

  copy_fregs_to_user()            # was: fsave_user()
  copy_fxregs_to_user()           # was: fxsave_user()
  copy_xregs_to_user()            # was: xsave_user()

  copy_user_to_fregs()            # was: frstor_user()
  copy_user_to_fxregs()           # was: fxrstor_user()
  copy_user_to_xregs()            # was: xrestore_user()
  copy_user_to_fpregs_zeroing()   # was: restore_user_xstate()

Eliminate fpu_xrstor_checking(), because it was just a wrapper.

No change in functionality.

Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

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

@@ -133,57 +133,57 @@ extern void fpstate_sanitize_xstate(struct fpu *fpu);
 	err;								\
 })
 
-static inline int fsave_user(struct i387_fsave_struct __user *fx)
+static inline int copy_fregs_to_user(struct i387_fsave_struct __user *fx)
 {
 	return user_insn(fnsave %[fx]; fwait,  [fx] "=m" (*fx), "m" (*fx));
 }
 
-static inline int fxsave_user(struct i387_fxsave_struct __user *fx)
+static inline int copy_fxregs_to_user(struct i387_fxsave_struct __user *fx)
 {
 	if (config_enabled(CONFIG_X86_32))
 		return user_insn(fxsave %[fx], [fx] "=m" (*fx), "m" (*fx));
 	else if (config_enabled(CONFIG_AS_FXSAVEQ))
 		return user_insn(fxsaveq %[fx], [fx] "=m" (*fx), "m" (*fx));
 
-	/* See comment in fpu_fxsave() below. */
+	/* See comment in copy_fxregs_to_kernel() below. */
 	return user_insn(rex64/fxsave (%[fx]), "=m" (*fx), [fx] "R" (fx));
 }
 
-static inline int fxrstor_checking(struct i387_fxsave_struct *fx)
+static inline int copy_kernel_to_fxregs(struct i387_fxsave_struct *fx)
 {
 	if (config_enabled(CONFIG_X86_32))
 		return check_insn(fxrstor %[fx], "=m" (*fx), [fx] "m" (*fx));
 	else if (config_enabled(CONFIG_AS_FXSAVEQ))
 		return check_insn(fxrstorq %[fx], "=m" (*fx), [fx] "m" (*fx));
 
-	/* See comment in fpu_fxsave() below. */
+	/* See comment in copy_fxregs_to_kernel() below. */
 	return check_insn(rex64/fxrstor (%[fx]), "=m" (*fx), [fx] "R" (fx),
 			  "m" (*fx));
 }
 
-static inline int fxrstor_user(struct i387_fxsave_struct __user *fx)
+static inline int copy_user_to_fxregs(struct i387_fxsave_struct __user *fx)
 {
 	if (config_enabled(CONFIG_X86_32))
 		return user_insn(fxrstor %[fx], "=m" (*fx), [fx] "m" (*fx));
 	else if (config_enabled(CONFIG_AS_FXSAVEQ))
 		return user_insn(fxrstorq %[fx], "=m" (*fx), [fx] "m" (*fx));
 
-	/* See comment in fpu_fxsave() below. */
+	/* See comment in copy_fxregs_to_kernel() below. */
 	return user_insn(rex64/fxrstor (%[fx]), "=m" (*fx), [fx] "R" (fx),
 			  "m" (*fx));
 }
 
-static inline int frstor_checking(struct i387_fsave_struct *fx)
+static inline int copy_kernel_to_fregs(struct i387_fsave_struct *fx)
 {
 	return check_insn(frstor %[fx], "=m" (*fx), [fx] "m" (*fx));
 }
 
-static inline int frstor_user(struct i387_fsave_struct __user *fx)
+static inline int copy_user_to_fregs(struct i387_fsave_struct __user *fx)
 {
 	return user_insn(frstor %[fx], "=m" (*fx), [fx] "m" (*fx));
 }
 
-static inline void fpu_fxsave(struct fpu *fpu)
+static inline void copy_fxregs_to_kernel(struct fpu *fpu)
 {
 	if (config_enabled(CONFIG_X86_32))
 		asm volatile( "fxsave %[fx]" : [fx] "=m" (fpu->state.fxsave));
@@ -230,12 +230,12 @@ static inline void fpu_fxsave(struct fpu *fpu)
 static inline int copy_fpregs_to_fpstate(struct fpu *fpu)
 {
 	if (likely(use_xsave())) {
-		xsave_state(&fpu->state.xsave);
+		copy_xregs_to_kernel(&fpu->state.xsave);
 		return 1;
 	}
 
 	if (likely(use_fxsr())) {
-		fpu_fxsave(fpu);
+		copy_fxregs_to_kernel(fpu);
 		return 1;
 	}
 
@@ -251,11 +251,11 @@ static inline int copy_fpregs_to_fpstate(struct fpu *fpu)
 static inline int __copy_fpstate_to_fpregs(struct fpu *fpu)
 {
 	if (use_xsave())
-		return fpu_xrstor_checking(&fpu->state.xsave);
+		return copy_kernel_to_xregs(&fpu->state.xsave, -1);
 	else if (use_fxsr())
-		return fxrstor_checking(&fpu->state.fxsave);
+		return copy_kernel_to_fxregs(&fpu->state.fxsave);
 	else
-		return frstor_checking(&fpu->state.fsave);
+		return copy_kernel_to_fregs(&fpu->state.fsave);
 }
 
 static inline int copy_fpstate_to_fpregs(struct fpu *fpu)

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

@@ -58,7 +58,7 @@ extern void update_regset_xstate_info(unsigned int size, u64 xstate_mask);
  * This function is called only during boot time when x86 caps are not set
  * up and alternative can not be used yet.
  */
-static inline int xsave_state_booting(struct xsave_struct *fx)
+static inline int copy_xregs_to_kernel_booting(struct xsave_struct *fx)
 {
 	u64 mask = -1;
 	u32 lmask = mask;
@@ -86,7 +86,7 @@ static inline int xsave_state_booting(struct xsave_struct *fx)
  * This function is called only during boot time when x86 caps are not set
  * up and alternative can not be used yet.
  */
-static inline int xrstor_state_booting(struct xsave_struct *fx, u64 mask)
+static inline int copy_kernel_to_xregs_booting(struct xsave_struct *fx, u64 mask)
 {
 	u32 lmask = mask;
 	u32 hmask = mask >> 32;
@@ -112,7 +112,7 @@ static inline int xrstor_state_booting(struct xsave_struct *fx, u64 mask)
 /*
  * Save processor xstate to xsave area.
  */
-static inline int xsave_state(struct xsave_struct *fx)
+static inline int copy_xregs_to_kernel(struct xsave_struct *fx)
 {
 	u64 mask = -1;
 	u32 lmask = mask;
@@ -151,7 +151,7 @@ static inline int xsave_state(struct xsave_struct *fx)
 /*
  * Restore processor xstate from xsave area.
  */
-static inline int xrstor_state(struct xsave_struct *fx, u64 mask)
+static inline int copy_kernel_to_xregs(struct xsave_struct *fx, u64 mask)
 {
 	int err = 0;
 	u32 lmask = mask;
@@ -176,14 +176,6 @@ static inline int xrstor_state(struct xsave_struct *fx, u64 mask)
 	return err;
 }
 
-/*
- * Restore xstate context for new process during context switch.
- */
-static inline int fpu_xrstor_checking(struct xsave_struct *fx)
-{
-	return xrstor_state(fx, -1);
-}
-
 /*
  * Save xstate to user space xsave area.
  *
@@ -194,7 +186,7 @@ static inline int fpu_xrstor_checking(struct xsave_struct *fx)
  * backward compatibility for old applications which don't understand
  * compacted format of xsave area.
  */
-static inline int xsave_user(struct xsave_struct __user *buf)
+static inline int copy_xregs_to_user(struct xsave_struct __user *buf)
 {
 	int err;
 
@@ -218,7 +210,7 @@ static inline int xsave_user(struct xsave_struct __user *buf)
 /*
  * Restore xstate from user space xsave area.
  */
-static inline int xrestore_user(struct xsave_struct __user *buf, u64 mask)
+static inline int copy_user_to_xregs(struct xsave_struct __user *buf, u64 mask)
 {
 	int err = 0;
 	struct xsave_struct *xstate = ((__force struct xsave_struct *)buf);

arch/x86/kernel/fpu/core.c

@@ -398,9 +398,9 @@ void fpu__drop(struct fpu *fpu)
 static inline void copy_init_fpstate_to_fpregs(void)
 {
 	if (use_xsave())
-		xrstor_state(&init_fpstate.xsave, -1);
+		copy_kernel_to_xregs(&init_fpstate.xsave, -1);
 	else
-		fxrstor_checking(&init_fpstate.fxsave);
+		copy_kernel_to_fxregs(&init_fpstate.fxsave);
 }
 
 /*

arch/x86/kernel/fpu/xstate.c

@@ -260,11 +260,11 @@ static inline int copy_fpregs_to_sigframe(struct xsave_struct __user *buf)
 	int err;
 
 	if (use_xsave())
-		err = xsave_user(buf);
+		err = copy_xregs_to_user(buf);
 	else if (use_fxsr())
-		err = fxsave_user((struct i387_fxsave_struct __user *) buf);
+		err = copy_fxregs_to_user((struct i387_fxsave_struct __user *) buf);
 	else
-		err = fsave_user((struct i387_fsave_struct __user *) buf);
+		err = copy_fregs_to_user((struct i387_fsave_struct __user *) buf);
 
 	if (unlikely(err) && __clear_user(buf, xstate_size))
 		err = -EFAULT;
@@ -314,7 +314,7 @@ int copy_fpstate_to_sigframe(void __user *buf, void __user *buf_fx, int size)
 			return -1;
 		/* Update the thread's fxstate to save the fsave header. */
 		if (ia32_fxstate)
-			fpu_fxsave(&tsk->thread.fpu);
+			copy_fxregs_to_kernel(&tsk->thread.fpu);
 	} else {
 		fpstate_sanitize_xstate(&tsk->thread.fpu);
 		if (__copy_to_user(buf_fx, xsave, xstate_size))
@@ -367,23 +367,23 @@ sanitize_restored_xstate(struct task_struct *tsk,
 /*
  * Restore the extended state if present. Otherwise, restore the FP/SSE state.
  */
-static inline int restore_user_xstate(void __user *buf, u64 xbv, int fx_only)
+static inline int copy_user_to_fpregs_zeroing(void __user *buf, u64 xbv, int fx_only)
 {
 	if (use_xsave()) {
 		if ((unsigned long)buf % 64 || fx_only) {
 			u64 init_bv = xfeatures_mask & ~XSTATE_FPSSE;
-			xrstor_state(&init_fpstate.xsave, init_bv);
-			return fxrstor_user(buf);
+			copy_kernel_to_xregs(&init_fpstate.xsave, init_bv);
+			return copy_user_to_fxregs(buf);
 		} else {
 			u64 init_bv = xfeatures_mask & ~xbv;
 			if (unlikely(init_bv))
-				xrstor_state(&init_fpstate.xsave, init_bv);
-			return xrestore_user(buf, xbv);
+				copy_kernel_to_xregs(&init_fpstate.xsave, init_bv);
+			return copy_user_to_xregs(buf, xbv);
 		}
 	} else if (use_fxsr()) {
-		return fxrstor_user(buf);
+		return copy_user_to_fxregs(buf);
 	} else
-		return frstor_user(buf);
+		return copy_user_to_fregs(buf);
 }
 
 static int __fpu__restore_sig(void __user *buf, void __user *buf_fx, int size)
@@ -471,7 +471,7 @@ static int __fpu__restore_sig(void __user *buf, void __user *buf_fx, int size)
 		 * state to the registers directly (with exceptions handled).
 		 */
 		user_fpu_begin();
-		if (restore_user_xstate(buf_fx, xfeatures, fx_only)) {
+		if (copy_user_to_fpregs_zeroing(buf_fx, xfeatures, fx_only)) {
 			fpu__clear(fpu);
 			return -1;
 		}
@@ -667,13 +667,13 @@ static void setup_init_fpu_buf(void)
 	/*
 	 * Init all the features state with header_bv being 0x0
 	 */
-	xrstor_state_booting(&init_fpstate.xsave, -1);
+	copy_kernel_to_xregs_booting(&init_fpstate.xsave, -1);
 
 	/*
 	 * Dump the init state again. This is to identify the init state
 	 * of any feature which is not represented by all zero's.
 	 */
-	xsave_state_booting(&init_fpstate.xsave);
+	copy_xregs_to_kernel_booting(&init_fpstate.xsave);
 }
 
 /*

arch/x86/mm/mpx.c

@@ -389,7 +389,7 @@ int mpx_enable_management(struct task_struct *tsk)
 	 * directory into XSAVE/XRSTOR Save Area and enable MPX through
 	 * XRSTOR instruction.
 	 *
-	 * xsave_state() is expected to be very expensive. Storing the bounds
+	 * copy_xregs_to_kernel() is expected to be very expensive. Storing the bounds
 	 * directory here means that we do not have to do xsave in the unmap
 	 * path; we can just use mm->bd_addr instead.
 	 */