From patchwork Wed Apr 3 16:41:49 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sebastian Andrzej Siewior X-Patchwork-Id: 10884143 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id BCC2D17E0 for ; Wed, 3 Apr 2019 16:43:32 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A79F8289F2 for ; Wed, 3 Apr 2019 16:43:32 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9C3A828A0B; Wed, 3 Apr 2019 16:43:32 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C9B6E28A08 for ; Wed, 3 Apr 2019 16:43:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728696AbfDCQnY (ORCPT ); Wed, 3 Apr 2019 12:43:24 -0400 Received: from Galois.linutronix.de ([146.0.238.70]:41991 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727403AbfDCQmb (ORCPT ); Wed, 3 Apr 2019 12:42:31 -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 1hBiy1-0004GO-1M; Wed, 03 Apr 2019 18:42:25 +0200 From: Sebastian Andrzej Siewior To: linux-kernel@vger.kernel.org Cc: x86@kernel.org, Andy Lutomirski , Paolo Bonzini , =?utf-8?b?UmFkaW0gS3LEjW3DocWZ?= , kvm@vger.kernel.org, "Jason A. Donenfeld" , Rik van Riel , Dave Hansen , Sebastian Andrzej Siewior Subject: [PATCH 20/27] x86/fpu: Inline copy_user_to_fpregs_zeroing() Date: Wed, 3 Apr 2019 18:41:49 +0200 Message-Id: <20190403164156.19645-21-bigeasy@linutronix.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190403164156.19645-1-bigeasy@linutronix.de> References: <20190403164156.19645-1-bigeasy@linutronix.de> MIME-Version: 1.0 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Start refactoring __fpu__restore_sig() by inlining copy_user_to_fpregs_zeroing(). The orignal function remains and will be used to restore from userland memory if possible. Signed-off-by: Sebastian Andrzej Siewior --- arch/x86/kernel/fpu/signal.c | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/fpu/signal.c b/arch/x86/kernel/fpu/signal.c index c98c7bca13bc0..f733425c66d8d 100644 --- a/arch/x86/kernel/fpu/signal.c +++ b/arch/x86/kernel/fpu/signal.c @@ -337,11 +337,29 @@ 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; }