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 45B42C433F5 for ; Wed, 5 Oct 2022 11:03:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229598AbiJELDL (ORCPT ); Wed, 5 Oct 2022 07:03:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50418 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229570AbiJELDK (ORCPT ); Wed, 5 Oct 2022 07:03:10 -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 6448B6CF4F; Wed, 5 Oct 2022 04:03:07 -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 0FDCB218FE; Wed, 5 Oct 2022 11:03:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1664967785; 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=Mn2ERzJt4xEctpaemvG4sO9hC3a9tpeTQ3BtEW76vKI=; b=PfVG4z/1OzaVpXpTB/EtYtDvm0Clx6Ojw24ScC8wkwrg3FX8MZ8CHsTfH1GXTTEqfOLljI 152mpZVrMGozo3d/l+uCpTkGfqL//JcoKMWw2bvXKyPv1mgILh/FNFjVO1X1o+Cwc253iA 3zrdguoCBHG1ytezJtEmFNBAJURdWzg= 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 B03A313345; Wed, 5 Oct 2022 11:03:04 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id dt+zKWhkPWPbQgAAMHmgww (envelope-from ); Wed, 05 Oct 2022 11:03:04 +0000 From: Juergen Gross To: linux-kernel@vger.kernel.org, x86@kernel.org, linux-doc@vger.kernel.org Cc: Juergen Gross , Boris Ostrovsky , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , xen-devel@lists.xenproject.org, Jonathan Corbet Subject: [PATCH v3 0/4] xen/pv: sanitize xen pv guest msr accesses Date: Wed, 5 Oct 2022 13:02:58 +0200 Message-Id: <20221005110302.13455-1-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-doc@vger.kernel.org Historically when running as Xen PV guest all MSR accesses have been silently swallowing any GP faults, even when the kernel was using not the *msr_safe() access functions. Change that by making the behavior controllable via kernel config and via a boot parameter. This will help finding paths where MSRs are being accessed under Xen which are not emulated by the hypervisor. Changes in V3: - new patch 2 - addressed comments Juergen Gross (4): xen/pv: add fault recovery control to pmu msr accesses xen/pv: fix vendor checks for pmu emulation xen/pv: refactor msr access functions to support safe and unsafe accesses xen/pv: support selecting safe/unsafe msr accesses .../admin-guide/kernel-parameters.txt | 6 ++ arch/x86/xen/Kconfig | 9 ++ arch/x86/xen/enlighten_pv.c | 99 +++++++++++++------ arch/x86/xen/pmu.c | 71 +++++++------ 4 files changed, 127 insertions(+), 58 deletions(-) -- 2.35.3