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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D3623C3526F for ; Mon, 24 Jan 2022 20:52:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1392084AbiAXUuZ (ORCPT ); Mon, 24 Jan 2022 15:50:25 -0500 Received: from ams.source.kernel.org ([145.40.68.75]:44258 "EHLO ams.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1358591AbiAXUmd (ORCPT ); Mon, 24 Jan 2022 15:42:33 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 3BBEDB80CCF; Mon, 24 Jan 2022 20:42:32 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5659BC340EB; Mon, 24 Jan 2022 20:42:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1643056951; bh=/+mI8nrRREij5JDaj6gEO/h76K+KA7kZdaVgSdBD+Fk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=1FjNCKr7ZuPMp216hFCuix/bToR93MgBEyIpFubQ4H0VPU9dLM4mMfuMcUz8QkAYx EaMIlFIlY5kjmRWMoOXziJwkg13j9mm3xuzFDuIO7ImLc28Ya8Jr8sgQildT+y6OQx aPHVqzgmlhBqoIlizPDYz26D2djwHgahnQKOhmLo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Thadeu Lima de Souza Cascardo , Michael Ellerman , Sasha Levin Subject: [PATCH 5.15 646/846] selftests/powerpc/spectre_v2: Return skip code when miss_percent is high Date: Mon, 24 Jan 2022 19:42:43 +0100 Message-Id: <20220124184123.304034151@linuxfoundation.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220124184100.867127425@linuxfoundation.org> References: <20220124184100.867127425@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: stable@vger.kernel.org From: Thadeu Lima de Souza Cascardo [ Upstream commit 3c42e9542050d49610077e083c7c3f5fd5e26820 ] A mis-match between reported and actual mitigation is not restricted to the Vulnerable case. The guest might also report the mitigation as "Software count cache flush" and the host will still mitigate with branch cache disabled. So, instead of skipping depending on the detected mitigation, simply skip whenever the detected miss_percent is the expected one for a fully mitigated system, that is, above 95%. Signed-off-by: Thadeu Lima de Souza Cascardo Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20211207130557.40566-1-cascardo@canonical.com Signed-off-by: Sasha Levin --- tools/testing/selftests/powerpc/security/spectre_v2.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/testing/selftests/powerpc/security/spectre_v2.c b/tools/testing/selftests/powerpc/security/spectre_v2.c index adc2b7294e5fd..83647b8277e7d 100644 --- a/tools/testing/selftests/powerpc/security/spectre_v2.c +++ b/tools/testing/selftests/powerpc/security/spectre_v2.c @@ -193,7 +193,7 @@ int spectre_v2_test(void) * We are not vulnerable and reporting otherwise, so * missing such a mismatch is safe. */ - if (state == VULNERABLE) + if (miss_percent > 95) return 4; return 1; -- 2.34.1