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 9AD35C433F5 for ; Mon, 17 Jan 2022 17:06:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242097AbiAQRGX (ORCPT ); Mon, 17 Jan 2022 12:06:23 -0500 Received: from dfw.source.kernel.org ([139.178.84.217]:54184 "EHLO dfw.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242080AbiAQREQ (ORCPT ); Mon, 17 Jan 2022 12:04:16 -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 dfw.source.kernel.org (Postfix) with ESMTPS id E6BC861290; Mon, 17 Jan 2022 17:04:15 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8C335C36AE3; Mon, 17 Jan 2022 17:04:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1642439055; bh=/+mI8nrRREij5JDaj6gEO/h76K+KA7kZdaVgSdBD+Fk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dVsv76PdfL85BNfIIMuuvjsXV4RASKkUDiCXtjHT0ZjP33ysKuNA8qTOv2qrWDg4B d1p5p6MI+fKSOEHM8pJwF2LZ31jy7lgpUy1okFDbjXP/YBR98DWePoj7776a68Ouba k9mzt3wt1EjhYI9eigg99/n6LWLvq/n2zlORcff3w9j4buR5ChOSclr8V+cXW+ZxAO 4b/tWNZs1T74jBTnf6qvD03i1GXPD8SNBhRkI9c3NYny74R3SkEt7pTnVRHZstc6yl P9B+7xpw6vEBFIMHKQromLtazaruGrWNXvK1KtrVLwBHObi26BJ+ABrTEVn6T9TooB uGKupCLwr+nhg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Thadeu Lima de Souza Cascardo , Michael Ellerman , Sasha Levin , shuah@kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kselftest@vger.kernel.org Subject: [PATCH AUTOSEL 5.10 22/34] selftests/powerpc/spectre_v2: Return skip code when miss_percent is high Date: Mon, 17 Jan 2022 12:03:12 -0500 Message-Id: <20220117170326.1471712-22-sashal@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220117170326.1471712-1-sashal@kernel.org> References: <20220117170326.1471712-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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