From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AB8JxZqb+ng4yFnF+nW90eoTD32tHnsDYV0vpsVkKLsGi21IPTxSmMeMGmeScVdUdAzMUR1wijwA ARC-Seal: i=1; a=rsa-sha256; t=1524837674; cv=none; d=google.com; s=arc-20160816; b=Fe4RbdOMRoH9GV1f0n+KBobiKfF7V6Vh20WNv4R7r9myYU2Tn3u2riOhit27iGpZLV qSvFwPK/pzq1LpJO6Fm+GSpjDpz1BBuXXu1jkE+TiS4IhR0zb64poYwPi/wg1zPAElRn svLICLeZgmcEHeAlZJJfW1+ThFVNCvzZJRkdaH2eiVYrX7yoEITLfpNzD4jitBL8WuSZ inQf3dCnsr2I7Sdvy3wUrLcwDM4mCl9zs9zuTjCtdY8CrayoKpBiGJBlh80pP1m1Fr8f AGaVuoArWnLNsSZtX60iPw4ueCXiKeA4Fwnf47EfsFkjM2Ocl7hsSscc2P5lASbOGn/7 d1Hg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:in-reply-to:message-id:date :subject:cc:to:from:dmarc-filter:arc-authentication-results; bh=p2VFOG1e8YmOPBM2BL6bi1rCbUlmIDqL0Gf+tkFcPVk=; b=M/HG9o4KNRfZzZsCP4Igwtp5KeH0FOZqbro48dNJ8q14eCXIcV5vSExgFqa3THp1tE p/VWT7zTcdphbYj095bFPWLBXkol3du/JT++6MsUTlaTxwjJiKgUWOhXYKZlniROBxoB muNj3L5YdODoWFbjSL8lGYGZ+2uFuwWZl5Qtrxz/9rxXyEmA4MVyCG+Os4u0rBva8GyH oh3lOsTv6/LunLaPHWDAN3+EW2vq/jCNKqywuagN+1ycosWod5pMPJJC3j3pQ5kXmgtN mUc2GQ4X4ySsY5qJxQt5/2DKSqOwDs4XKqjBKciTFnVPkvzk0hEpdP72hJMArGDodWy0 30Jw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of srs0=4/0d=hq=linuxfoundation.org=gregkh@kernel.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=SRS0=4/0d=HQ=linuxfoundation.org=gregkh@kernel.org Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of srs0=4/0d=hq=linuxfoundation.org=gregkh@kernel.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=SRS0=4/0d=HQ=linuxfoundation.org=gregkh@kernel.org DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B538F2185A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=fail smtp.mailfrom=gregkh@linuxfoundation.org From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Martin Schwidefsky Subject: [PATCH 4.4 24/50] s390: report spectre mitigation via syslog Date: Fri, 27 Apr 2018 15:58:26 +0200 Message-Id: <20180427135657.143654571@linuxfoundation.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180427135655.623669681@linuxfoundation.org> References: <20180427135655.623669681@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-LABELS: =?utf-8?b?IlxcU2VudCI=?= X-GMAIL-THRID: =?utf-8?q?1598908189377552235?= X-GMAIL-MSGID: =?utf-8?q?1598908189377552235?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Martin Schwidefsky [ Upstream commit bc035599718412cfba9249aa713f90ef13f13ee9 ] Add a boot message if either of the spectre defenses is active. The message is "Spectre V2 mitigation: execute trampolines." or "Spectre V2 mitigation: limited branch prediction." Signed-off-by: Martin Schwidefsky Signed-off-by: Greg Kroah-Hartman --- arch/s390/kernel/nospec-branch.c | 10 ++++++++++ 1 file changed, 10 insertions(+) --- a/arch/s390/kernel/nospec-branch.c +++ b/arch/s390/kernel/nospec-branch.c @@ -33,6 +33,16 @@ static int __init nospec_setup_early(cha } early_param("nospec", nospec_setup_early); +static int __init nospec_report(void) +{ + if (IS_ENABLED(CC_USING_EXPOLINE) && !nospec_disable) + pr_info("Spectre V2 mitigation: execute trampolines.\n"); + if (__test_facility(82, S390_lowcore.alt_stfle_fac_list)) + pr_info("Spectre V2 mitigation: limited branch prediction.\n"); + return 0; +} +arch_initcall(nospec_report); + #ifdef CONFIG_EXPOLINE int nospec_disable = IS_ENABLED(CONFIG_EXPOLINE_OFF);