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 08E40C433FE for ; Tue, 4 Oct 2022 08:44:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230167AbiJDIoV (ORCPT ); Tue, 4 Oct 2022 04:44:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34912 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229788AbiJDIoU (ORCPT ); Tue, 4 Oct 2022 04:44:20 -0400 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.220.29]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C94BA3ECD9; Tue, 4 Oct 2022 01:44:15 -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-out2.suse.de (Postfix) with ESMTPS id EE5721F906; Tue, 4 Oct 2022 08:44:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1664873053; 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=pkvZorSqwy2f71DPO/+7+BS5jmcswx42HigCezR1J2c=; b=htAnD9jVfSLDJkzaPxT31pjcyxBQjj+t59V8w6XLyz8YrjMUa8Vy2EzU84Kq52RaRo6d5n aa0YhuQ/1q9iaLI+0ULaX/7o/9+88FXRcgFgk15Hewr1mj3Kk21JhfWOpbTj2nGhGu/won PXqtACp/oAEAq1Gx8lVJ7ky+TV3sg4A= 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 9A4D3139D2; Tue, 4 Oct 2022 08:44:13 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id m9ZEJF3yO2OjVwAAMHmgww (envelope-from ); Tue, 04 Oct 2022 08:44:13 +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 v2 0/3] xen/pv: sanitize xen pv guest msr accesses Date: Tue, 4 Oct 2022 10:43:32 +0200 Message-Id: <20221004084335.2838-1-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. Juergen Gross (3): xen/pv: allow pmu msr accesses to cause GP 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 | 61 ++++++------ 4 files changed, 118 insertions(+), 57 deletions(-) -- 2.35.3