From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3A924C43381 for ; Thu, 21 Mar 2019 20:28:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1338A21925 for ; Thu, 21 Mar 2019 20:28:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729175AbfCUU2H (ORCPT ); Thu, 21 Mar 2019 16:28:07 -0400 Received: from Galois.linutronix.de ([146.0.238.70]:39411 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728999AbfCUU05 (ORCPT ); Thu, 21 Mar 2019 16:26:57 -0400 Received: from localhost ([127.0.0.1] helo=flow.W.breakpoint.cc) by Galois.linutronix.de with esmtp (Exim 4.80) (envelope-from ) id 1h74H5-00057y-W8; Thu, 21 Mar 2019 21:26:52 +0100 From: Sebastian Andrzej Siewior To: linux-kernel@vger.kernel.org Cc: x86@kernel.org, Andy Lutomirski , Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , kvm@vger.kernel.org, "Jason A. Donenfeld" , Rik van Riel , Dave Hansen , Sebastian Andrzej Siewior Subject: [PATCH 20/24] x86/fpu: Inline copy_user_to_fpregs_zeroing() Date: Thu, 21 Mar 2019 21:26:28 +0100 Message-Id: <20190321202632.16810-21-bigeasy@linutronix.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190321202632.16810-1-bigeasy@linutronix.de> References: <20190321202632.16810-1-bigeasy@linutronix.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Start refactoring __fpu__restore_sig() by inlining copy_user_to_fpregs_zeroing(). Signed-off-by: Sebastian Andrzej Siewior --- arch/x86/kernel/fpu/signal.c | 42 ++++++++++++++++-------------------- 1 file changed, 19 insertions(+), 23 deletions(-) diff --git a/arch/x86/kernel/fpu/signal.c b/arch/x86/kernel/fpu/signal.c index 97ea6909ede1f..5a467a381245c 100644 --- a/arch/x86/kernel/fpu/signal.c +++ b/arch/x86/kernel/fpu/signal.c @@ -220,28 +220,6 @@ sanitize_restored_xstate(union fpregs_state *state, } } -/* - * Restore the extended state if present. Otherwise, restore the FP/SSE state. - */ -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 & ~XFEATURE_MASK_FPSSE; - 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)) - copy_kernel_to_xregs(&init_fpstate.xsave, init_bv); - return copy_user_to_xregs(buf, xbv); - } - } else if (use_fxsr()) { - return copy_user_to_fxregs(buf); - } else - return copy_user_to_fregs(buf); -} - static int __fpu__restore_sig(void __user *buf, void __user *buf_fx, int size) { int ia32_fxstate = (buf != buf_fx); @@ -319,11 +297,29 @@ static int __fpu__restore_sig(void __user *buf, void __user *buf_fx, int size) kfree(tmp); return err; } else { + int ret; + /* * For 64-bit frames and 32-bit fsave frames, restore the user * state to the registers directly (with exceptions handled). */ - if (copy_user_to_fpregs_zeroing(buf_fx, xfeatures, fx_only)) { + if (use_xsave()) { + if ((unsigned long)buf_fx % 64 || fx_only) { + u64 init_bv = xfeatures_mask & ~XFEATURE_MASK_FPSSE; + copy_kernel_to_xregs(&init_fpstate.xsave, init_bv); + ret = copy_user_to_fxregs(buf_fx); + } else { + u64 init_bv = xfeatures_mask & ~xfeatures; + if (unlikely(init_bv)) + copy_kernel_to_xregs(&init_fpstate.xsave, init_bv); + ret = copy_user_to_xregs(buf_fx, xfeatures); + } + } else if (use_fxsr()) { + ret = copy_user_to_fxregs(buf_fx); + } else + ret = copy_user_to_fregs(buf_fx); + + if (ret) { fpu__clear(fpu); return -1; } -- 2.20.1