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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable 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 51F4DC43462 for ; Mon, 26 Apr 2021 07:50:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1ED1A61041 for ; Mon, 26 Apr 2021 07:50:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233597AbhDZHuu (ORCPT ); Mon, 26 Apr 2021 03:50:50 -0400 Received: from mail.kernel.org ([198.145.29.99]:60146 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233484AbhDZHlv (ORCPT ); Mon, 26 Apr 2021 03:41:51 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 3C26161263; Mon, 26 Apr 2021 07:39:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1619422754; bh=6v8gePp/8bRPStrNt0IOaXTQgKioOFc+AMGRHdCE9C0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xCmDgDF+fJzJaYRqI49CD4HbHQ/YK8EQWp2SfGLhS7BYZQZJrgDu3P0ZJntQZI/qN Br3svnUQrGDNhfRh1MsgRfXpxHTiyeaNGmssa8lsKl8PGb4vZt6yH143DnKjFC9/Gz 8QcF2iH4toKBstHSfTgW6id4pOMx9EIe2jGFg600= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jim Mattson , "Peter Zijlstra (Intel)" , Peter Shier , Andi Kleen , Sasha Levin Subject: [PATCH 5.10 15/36] perf/x86/kvm: Fix Broadwell Xeon stepping in isolation_ucodes[] Date: Mon, 26 Apr 2021 09:29:57 +0200 Message-Id: <20210426072819.307837109@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210426072818.777662399@linuxfoundation.org> References: <20210426072818.777662399@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jim Mattson [ Upstream commit 4b2f1e59229b9da319d358828cdfa4ddbc140769 ] The only stepping of Broadwell Xeon parts is stepping 1. Fix the relevant isolation_ucodes[] entry, which previously enumerated stepping 2. Although the original commit was characterized as an optimization, it is also a workaround for a correctness issue. If a PMI arrives between kvm's call to perf_guest_get_msrs() and the subsequent VM-entry, a stale value for the IA32_PEBS_ENABLE MSR may be restored at the next VM-exit. This is because, unbeknownst to kvm, PMI throttling may clear bits in the IA32_PEBS_ENABLE MSR. CPUs with "PEBS isolation" don't suffer from this issue, because perf_guest_get_msrs() doesn't report the IA32_PEBS_ENABLE value. Fixes: 9b545c04abd4f ("perf/x86/kvm: Avoid unnecessary work in guest filtering") Signed-off-by: Jim Mattson Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Peter Shier Acked-by: Andi Kleen Link: https://lkml.kernel.org/r/20210422001834.1748319-1-jmattson@google.com Signed-off-by: Sasha Levin --- arch/x86/events/intel/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c index e7dc13fe5e29..0b9975200ae3 100644 --- a/arch/x86/events/intel/core.c +++ b/arch/x86/events/intel/core.c @@ -4387,7 +4387,7 @@ static const struct x86_cpu_desc isolation_ucodes[] = { INTEL_CPU_DESC(INTEL_FAM6_BROADWELL_D, 3, 0x07000009), INTEL_CPU_DESC(INTEL_FAM6_BROADWELL_D, 4, 0x0f000009), INTEL_CPU_DESC(INTEL_FAM6_BROADWELL_D, 5, 0x0e000002), - INTEL_CPU_DESC(INTEL_FAM6_BROADWELL_X, 2, 0x0b000014), + INTEL_CPU_DESC(INTEL_FAM6_BROADWELL_X, 1, 0x0b000014), INTEL_CPU_DESC(INTEL_FAM6_SKYLAKE_X, 3, 0x00000021), INTEL_CPU_DESC(INTEL_FAM6_SKYLAKE_X, 4, 0x00000000), INTEL_CPU_DESC(INTEL_FAM6_SKYLAKE_X, 5, 0x00000000), -- 2.30.2