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 63E29EB64D9 for ; Thu, 15 Jun 2023 12:40:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S245201AbjFOMkL (ORCPT ); Thu, 15 Jun 2023 08:40:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44246 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S245029AbjFOMkE (ORCPT ); Thu, 15 Jun 2023 08:40:04 -0400 Received: from smtp-out1.suse.de (smtp-out1.suse.de [IPv6:2001:67c:2178:6::1c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7D0751FE4 for ; Thu, 15 Jun 2023 05:40:02 -0700 (PDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (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-out1.suse.de (Postfix) with ESMTPS id 38D70223DE; Thu, 15 Jun 2023 12:40:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1686832801; 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; bh=sLKvpHmhwxzhGsa8RD9GXj1E3Cqd53RX8qPUzRGgONI=; b=Adcvt8jp3J6VJHStWp7XI8UqjjBdIO+60lveaGrjsR2IoO908L/uW+lrRpAlKri7Tr1U1b 0rSAZhSTlsBqaIbAeAjCVNdKHFRgkFCQ/FRCyulDtp7vEKz/s5lL6REthbZkfhlyB+L2PA Eawu3ARj6wsxY5ljRaIEnRG2FZSLwEo= Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (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 imap2.suse-dmz.suse.de (Postfix) with ESMTPS id D010513A47; Thu, 15 Jun 2023 12:40:00 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id JJxjMaAGi2T1OQAAMHmgww (envelope-from ); Thu, 15 Jun 2023 12:40:00 +0000 From: Juergen Gross To: linux-kernel@vger.kernel.org, x86@kernel.org Cc: Juergen Gross , Boris Ostrovsky , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , xen-devel@lists.xenproject.org Subject: [PATCH] x86/xen: set default memory type for pv guests to WB Date: Thu, 15 Jun 2023 14:39:59 +0200 Message-Id: <20230615123959.12298-1-jgross@suse.com> X-Mailer: git-send-email 2.35.3 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When running as an unprivileged PV-guest under Xen (not dom0), the default MTRR memory type should be write-back. Signed-off-by: Juergen Gross --- Based on tip x86/mtrr branch --- arch/x86/xen/enlighten_pv.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c index 8732b85d5650..93b658248d01 100644 --- a/arch/x86/xen/enlighten_pv.c +++ b/arch/x86/xen/enlighten_pv.c @@ -187,6 +187,8 @@ static void __init xen_pv_init_platform(void) if (xen_initial_domain()) xen_set_mtrr_data(); + else + mtrr_overwrite_state(NULL, 0, MTRR_TYPE_WRBACK); } static void __init xen_pv_guest_late_init(void) -- 2.35.3