x86/fpu: Rename copy_kernel_to_fpregs() to restore_fpregs_from_fpstate()

This is not a copy functionality. It restores the register state from the
supplied kernel buffer.

No functional changes.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210623121454.716058365@linutronix.de

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

@@ -376,7 +376,7 @@ static inline int os_xrstor_safe(struct xregs_state *xstate, u64 mask)
 	return err;
 }
 
-static inline void __copy_kernel_to_fpregs(union fpregs_state *fpstate, u64 mask)
+static inline void __restore_fpregs_from_fpstate(union fpregs_state *fpstate, u64 mask)
 {
 	if (use_xsave()) {
 		os_xrstor(&fpstate->xsave, mask);
@@ -388,7 +388,7 @@ static inline void __copy_kernel_to_fpregs(union fpregs_state *fpstate, u64 mask
 	}
 }
 
-static inline void copy_kernel_to_fpregs(union fpregs_state *fpstate)
+static inline void restore_fpregs_from_fpstate(union fpregs_state *fpstate)
 {
 	/*
 	 * AMD K7/K8 CPUs don't save/restore FDP/FIP/FOP unless an exception is
@@ -403,7 +403,7 @@ static inline void copy_kernel_to_fpregs(union fpregs_state *fpstate)
 			: : [addr] "m" (fpstate));
 	}
 
-	__copy_kernel_to_fpregs(fpstate, -1);
+	__restore_fpregs_from_fpstate(fpstate, -1);
 }
 
 extern int copy_fpstate_to_sigframe(void __user *buf, void __user *fp, int size);
@@ -474,7 +474,7 @@ static inline void __fpregs_load_activate(void)
 		return;
 
 	if (!fpregs_state_valid(fpu, cpu)) {
-		copy_kernel_to_fpregs(&fpu->state);
+		restore_fpregs_from_fpstate(&fpu->state);
 		fpregs_activate(fpu);
 		fpu->last_cpu = cpu;
 	}

arch/x86/kvm/x86.c

@@ -9653,7 +9653,7 @@ static void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
 	 */
 	if (vcpu->arch.guest_fpu)
 		/* PKRU is separately restored in kvm_x86_ops.run. */
-		__copy_kernel_to_fpregs(&vcpu->arch.guest_fpu->state,
+		__restore_fpregs_from_fpstate(&vcpu->arch.guest_fpu->state,
 					~XFEATURE_MASK_PKRU);
 
 	fpregs_mark_activate();
@@ -9674,7 +9674,7 @@ static void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
 	if (vcpu->arch.guest_fpu)
 		kvm_save_current_fpu(vcpu->arch.guest_fpu);
 
-	copy_kernel_to_fpregs(&vcpu->arch.user_fpu->state);
+	restore_fpregs_from_fpstate(&vcpu->arch.user_fpu->state);
 
 	fpregs_mark_activate();
 	fpregs_unlock();

arch/x86/mm/extable.c

@@ -65,7 +65,7 @@ __visible bool ex_handler_fprestore(const struct exception_table_entry *fixup,
 	WARN_ONCE(1, "Bad FPU state detected at %pB, reinitializing FPU registers.",
 		  (void *)instruction_pointer(regs));
 
-	__copy_kernel_to_fpregs(&init_fpstate, -1);
+	__restore_fpregs_from_fpstate(&init_fpstate, -1);
 	return true;
 }
 EXPORT_SYMBOL_GPL(ex_handler_fprestore);