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 B41F0C4332F for ; Mon, 17 Jan 2022 17:04:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241574AbiAQREJ (ORCPT ); Mon, 17 Jan 2022 12:04:09 -0500 Received: from ams.source.kernel.org ([145.40.68.75]:48908 "EHLO ams.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241814AbiAQRC0 (ORCPT ); Mon, 17 Jan 2022 12:02:26 -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 9561CB81151; Mon, 17 Jan 2022 17:02:25 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8CAEEC36AE3; Mon, 17 Jan 2022 17:02:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1642438944; bh=/+mI8nrRREij5JDaj6gEO/h76K+KA7kZdaVgSdBD+Fk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GQGJradU2ZhiqDNGrl7G1uuFKHhyzMZr2N4o4H3wMZT/LdIhKNNxtHDjIF3qpnpod Z5t8xW7M2aBrx0i7wOuJmqDHQOXsnIdo+G/KsitgfivNqgiDaCmlY8SsbHKPXjWEAs ms6qA3VBcPsKPrcL5WUKMgP7JJlCtgtWzlkn5KX0eS8EspyN0CaAtZq8gkXYWj7jZs LaTGj32Vvu6QZ0K+7SPn0RqlpZ6/vh52ikZGc9WBiE22x+xDWf2VEAVQnq8BIOJU/e giZFERc3Eo9dwEgE8MU15TqimwWbfnxibVK0EJSc4Mm/LjOSf64UUqKERqEVYBnNjU xNYjHk2GbaV4A== 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 5.15 25/44] selftests/powerpc/spectre_v2: Return skip code when miss_percent is high Date: Mon, 17 Jan 2022 12:01:08 -0500 Message-Id: <20220117170127.1471115-25-sashal@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220117170127.1471115-1-sashal@kernel.org> References: <20220117170127.1471115-1-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