From patchwork Wed Aug 11 12:29:23 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxim Levitsky X-Patchwork-Id: 12431095 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=-16.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, 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 autolearn=unavailable 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 810ACC4320A for ; Wed, 11 Aug 2021 12:30:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5FD8B60FC4 for ; Wed, 11 Aug 2021 12:30:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231190AbhHKMaj (ORCPT ); Wed, 11 Aug 2021 08:30:39 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:33503 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231777AbhHKMaR (ORCPT ); Wed, 11 Aug 2021 08:30:17 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1628684993; h=from:from:reply-to:subject:subject: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=L2zltoeBUaiiUWd903sk/fd+wquvy5ZlpMpjy5zL9F8=; b=IbsCfNpI9PRRV3w7Yg2xV0sPhYTGa8mRkqZA3ZkCr/8PIgkrAmvKfLfjdQoqSDJbceIAZ2 C+NFv3GAbm4TyceY2XWmWCk19oZmzJXckuf1P5t5ox4tYTm1U7p7pCZBmAvffCfEj2A9cC 8Qukp5HDcvjAPDO0ruM0H/f6ykwoNcQ= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-414-Dv_T0RRpNGOnprh8ybR84w-1; Wed, 11 Aug 2021 08:29:52 -0400 X-MC-Unique: Dv_T0RRpNGOnprh8ybR84w-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 210F0192D787; Wed, 11 Aug 2021 12:29:50 +0000 (UTC) Received: from localhost.localdomain (unknown [10.35.206.50]) by smtp.corp.redhat.com (Postfix) with ESMTP id 716085D9C6; Wed, 11 Aug 2021 12:29:42 +0000 (UTC) From: Maxim Levitsky To: kvm@vger.kernel.org Cc: Kieran Bingham , Jan Kiszka , Andrew Jones , Jonathan Corbet , Maxim Levitsky , Vitaly Kuznetsov , Sean Christopherson , Ingo Molnar , Thomas Gleixner , x86@kernel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)), Johannes Berg , Wanpeng Li , "H. Peter Anvin" , Jessica Yu , Jim Mattson , Paolo Bonzini , Joerg Roedel , Yang Weijiang , linux-kernel@vger.kernel.org, Borislav Petkov , linux-kselftest@vger.kernel.org (open list:KERNEL SELFTEST FRAMEWORK), linux-doc@vger.kernel.org (open list:DOCUMENTATION), Shuah Khan , Andrew Morton , Borislav Petkov Subject: [PATCH v3 2/6] KVM: x86: add force_intercept_exceptions_mask Date: Wed, 11 Aug 2021 15:29:23 +0300 Message-Id: <20210811122927.900604-3-mlevitsk@redhat.com> In-Reply-To: <20210811122927.900604-1-mlevitsk@redhat.com> References: <20210811122927.900604-1-mlevitsk@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This parameter will be used by VMX and SVM code to force interception of a set of exceptions, given by a bitmask for guest debug and/or kvm debug. This is based on an idea first shown here: https://patchwork.kernel.org/project/kvm/patch/20160301192822.GD22677@pd.tnic/ CC: Borislav Petkov Signed-off-by: Maxim Levitsky --- arch/x86/kvm/x86.c | 3 +++ arch/x86/kvm/x86.h | 2 ++ 2 files changed, 5 insertions(+) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index fdc0c18339fb..092e2fad3c0d 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -184,6 +184,9 @@ module_param(force_emulation_prefix, bool, S_IRUGO); int __read_mostly pi_inject_timer = -1; module_param(pi_inject_timer, bint, S_IRUGO | S_IWUSR); +uint force_intercept_exceptions_mask; +module_param(force_intercept_exceptions_mask, uint, S_IRUGO | S_IWUSR); +EXPORT_SYMBOL_GPL(force_intercept_exceptions_mask); /* * Restoring the host value for MSRs that are only consumed when running in * usermode, e.g. SYSCALL MSRs and TSC_AUX, can be deferred until the CPU diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h index 7d66d63dc55a..2b59825213c7 100644 --- a/arch/x86/kvm/x86.h +++ b/arch/x86/kvm/x86.h @@ -347,6 +347,8 @@ extern struct static_key kvm_no_apic_vcpu; extern bool report_ignored_msrs; +extern uint force_intercept_exceptions_mask; + static inline u64 nsec_to_cycles(struct kvm_vcpu *vcpu, u64 nsec) { return pvclock_scale_delta(nsec, vcpu->arch.virtual_tsc_mult,