From patchwork Mon Dec 28 12:49:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 353601 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=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_RED, 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 43947C4332B for ; Mon, 28 Dec 2020 14:25:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2A480229C5 for ; Mon, 28 Dec 2020 14:25:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2503265AbgL1OZm (ORCPT ); Mon, 28 Dec 2020 09:25:42 -0500 Received: from mail.kernel.org ([198.145.29.99]:33588 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2503235AbgL1OZl (ORCPT ); Mon, 28 Dec 2020 09:25:41 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 16103221F0; Mon, 28 Dec 2020 14:24:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1609165500; bh=GCqwiNM8CKthXJ1MkSyPy+fQbPxcDeXb+PrvpbBfHwk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BHR5GtBezNceWOrO9CQy081OgFi2PaFLeYmelsH+7C63hV9h4kFmPmSoeOcykPPaf CgUSVkAMZDpiaY48HxIgIN6F+oRTZddCxOOUrr66CzlYDPeer0xDm74AwrTcm8vZvX D2SlDYlec36Gs+YhmII3xGNpv0g8iAe6TIcljekg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Heiko Carstens , Sven Schnelle Subject: [PATCH 5.10 554/717] s390/idle: fix accounting with machine checks Date: Mon, 28 Dec 2020 13:49:12 +0100 Message-Id: <20201228125047.482308932@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201228125020.963311703@linuxfoundation.org> References: <20201228125020.963311703@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Sven Schnelle commit 454efcf82ea17d7efeb86ebaa20775a21ec87d27 upstream. When a machine check interrupt is triggered during idle, the code is using the async timer/clock for idle time calculation. It should use the machine check enter timer/clock which is passed to the macro. Fixes: 0b0ed657fe00 ("s390: remove critical section cleanup from entry.S") Cc: # 5.8 Reviewed-by: Heiko Carstens Signed-off-by: Sven Schnelle Signed-off-by: Heiko Carstens Signed-off-by: Greg Kroah-Hartman --- arch/s390/kernel/entry.S | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S @@ -110,7 +110,7 @@ _LPP_OFFSET = __LC_LPP #endif .endm - .macro SWITCH_ASYNC savearea,timer + .macro SWITCH_ASYNC savearea,timer,clock tmhh %r8,0x0001 # interrupting from user ? jnz 4f #if IS_ENABLED(CONFIG_KVM) @@ -143,8 +143,8 @@ _LPP_OFFSET = __LC_LPP la %r4,8(%r4) brct %r1,1b -2: mvc __CLOCK_IDLE_EXIT(8,%r2), __LC_INT_CLOCK - mvc __TIMER_IDLE_EXIT(8,%r2), __LC_ASYNC_ENTER_TIMER +2: mvc __CLOCK_IDLE_EXIT(8,%r2), \clock + mvc __TIMER_IDLE_EXIT(8,%r2), \timer # account system time going idle ni __LC_CPU_FLAGS+7,255-_CIF_ENABLED_WAIT @@ -761,7 +761,7 @@ ENTRY(io_int_handler) stmg %r8,%r15,__LC_SAVE_AREA_ASYNC lg %r12,__LC_CURRENT lmg %r8,%r9,__LC_IO_OLD_PSW - SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_ENTER_TIMER + SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_ENTER_TIMER,__LC_INT_CLOCK stmg %r0,%r7,__PT_R0(%r11) # clear user controlled registers to prevent speculative use xgr %r0,%r0 @@ -961,7 +961,7 @@ ENTRY(ext_int_handler) stmg %r8,%r15,__LC_SAVE_AREA_ASYNC lg %r12,__LC_CURRENT lmg %r8,%r9,__LC_EXT_OLD_PSW - SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_ENTER_TIMER + SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_ENTER_TIMER,__LC_INT_CLOCK stmg %r0,%r7,__PT_R0(%r11) # clear user controlled registers to prevent speculative use xgr %r0,%r0 @@ -1183,7 +1183,7 @@ ENTRY(mcck_int_handler) TSTMSK __LC_MCCK_CODE,MCCK_CODE_PSW_IA_VALID jno .Lmcck_panic 4: ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off - SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+64,__LC_MCCK_ENTER_TIMER + SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+64,__LC_MCCK_ENTER_TIMER,__LC_MCCK_CLOCK .Lmcck_skip: lghi %r14,__LC_GPREGS_SAVE_AREA+64 stmg %r0,%r7,__PT_R0(%r11)