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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 C71ACC4320A for ; Fri, 30 Jul 2021 07:18:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A826360FED for ; Fri, 30 Jul 2021 07:18:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237790AbhG3HSR (ORCPT ); Fri, 30 Jul 2021 03:18:17 -0400 Received: from smtp-out2.suse.de ([195.135.220.29]:43422 "EHLO smtp-out2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237480AbhG3HSN (ORCPT ); Fri, 30 Jul 2021 03:18:13 -0400 Received: from imap1.suse-dmz.suse.de (imap1.suse-dmz.suse.de [192.168.254.73]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id EA8E11FDB3; Fri, 30 Jul 2021 07:18:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1627629486; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=dXHUM7lXyWrAMLgi9KDBkwkBbe+GUHRQIfTUEaC3Es0=; b=CmagrxEtD3TrPfNSVaCrRb3MI++Zl+msTB5z3G5Rw6JB7REz302fCG1SqoONxV1eNTGnct Y+rl61k756x1QzQ+JElqVBfV00m8i4I2NGBtj+H1Y8RxSlw4j5dStPbm5iOlPeHUUcHVtO /QcnYVu7ZytRetzZdBNEKdoG4o56Ej8= Received: from imap1.suse-dmz.suse.de (imap1.suse-dmz.suse.de [192.168.254.73]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap1.suse-dmz.suse.de (Postfix) with ESMTPS id C1BDE13748; Fri, 30 Jul 2021 07:18:06 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap1.suse-dmz.suse.de with ESMTPSA id KJISLq6nA2FufQAAGKfGzw (envelope-from ); Fri, 30 Jul 2021 07:18:06 +0000 From: Juergen Gross To: xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org Cc: Juergen Gross , Boris Ostrovsky , Stefano Stabellini Subject: [PATCH v2 1/3] xen: check required Xen features Date: Fri, 30 Jul 2021 09:18:02 +0200 Message-Id: <20210730071804.4302-2-jgross@suse.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210730071804.4302-1-jgross@suse.com> References: <20210730071804.4302-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Linux kernel is not supported to run on Xen versions older than 4.0. Add tests for required Xen features always being present in Xen 4.0 and newer. Signed-off-by: Juergen Gross --- V2: - rename macro (Boris Ostrovsky) - panic() in case of missing feature (Boris Ostrovsky) --- drivers/xen/features.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/xen/features.c b/drivers/xen/features.c index 25c053b09605..7b591443833c 100644 --- a/drivers/xen/features.c +++ b/drivers/xen/features.c @@ -9,13 +9,26 @@ #include #include #include +#include #include +#include #include #include #include +/* + * Linux kernel expects at least Xen 4.0. + * + * Assume some features to be available for that reason (depending on guest + * mode, of course). + */ +#define chk_required_feature(f) { \ + if (!xen_feature(f)) \ + panic("Xen: feature %s not available!\n", #f); \ + } + u8 xen_features[XENFEAT_NR_SUBMAPS * 32] __read_mostly; EXPORT_SYMBOL_GPL(xen_features); @@ -31,4 +44,9 @@ void xen_setup_features(void) for (j = 0; j < 32; j++) xen_features[i * 32 + j] = !!(fi.submap & 1<