linux-kernel - [patch 19/41] x86/fpu: Rename copy_kernel_to_fpregs() to restore_fpregs_from

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Message-Id: <20210611163112.975911129@linutronix.de>
Date:   Fri, 11 Jun 2021 18:15:42 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Yu-cheng Yu <yu-cheng.yu@...el.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Borislav Petkov <bp@...e.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Kan Liang <kan.liang@...ux.intel.com>
Subject: [patch 19/41] x86/fpu: Rename copy_kernel_to_fpregs() to
 restore_fpregs_from_kernel()

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

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/include/asm/fpu/internal.h |    8 ++++----
 arch/x86/kernel/fpu/core.c          |    4 ++--
 arch/x86/kvm/x86.c                  |    4 ++--
 arch/x86/mm/extable.c               |    2 +-
 4 files changed, 9 insertions(+), 9 deletions(-)

--- a/arch/x86/include/asm/fpu/internal.h
+++ b/arch/x86/include/asm/fpu/internal.h
@@ -397,7 +397,7 @@ static inline int xrstor_from_kernel_err
 
 extern int save_fpregs_to_fpstate(struct fpu *fpu);
 
-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()) {
 		xrstor_from_kernel(&fpstate->xsave, mask);
@@ -409,7 +409,7 @@ static inline void __copy_kernel_to_fpre
 	}
 }
 
-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
@@ -424,7 +424,7 @@ static inline void copy_kernel_to_fpregs
 			: : [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);
@@ -495,7 +495,7 @@ static inline void __fpregs_load_activat
 		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;
 	}
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -173,7 +173,7 @@ void fpu__save(struct fpu *fpu)
 
 	if (!test_thread_flag(TIF_NEED_FPU_LOAD)) {
 		if (!save_fpregs_to_fpstate(fpu)) {
-			copy_kernel_to_fpregs(&fpu->state);
+			restore_fpregs_from_fpstate(&fpu->state);
 		}
 	}
 
@@ -256,7 +256,7 @@ int fpu__copy(struct task_struct *dst, s
 		memcpy(&dst_fpu->state, &src_fpu->state, fpu_kernel_xstate_size);
 
 	else if (!save_fpregs_to_fpstate(dst_fpu))
-		copy_kernel_to_fpregs(&dst_fpu->state);
+		restore_fpregs_from_fpstate(&dst_fpu->state);
 
 	fpregs_unlock();
 
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9634,7 +9634,7 @@ static void kvm_load_guest_fpu(struct kv
 	 */
 	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();
@@ -9655,7 +9655,7 @@ static void kvm_put_guest_fpu(struct kvm
 	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();
--- a/arch/x86/mm/extable.c
+++ b/arch/x86/mm/extable.c
@@ -65,7 +65,7 @@ EXPORT_SYMBOL_GPL(ex_handler_fault);
 	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);