From patchwork Thu Apr 1 13:54:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxim Levitsky X-Patchwork-Id: 12178135 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=-13.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 4D2C5C433ED for ; Thu, 1 Apr 2021 13:58:06 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C155B6101A for ; Thu, 1 Apr 2021 13:58:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C155B6101A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:Cc:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=cUqqokiWxPlx8EQTHJOqZyc84HVcSTT+0psSFgAlPII=; b=JhYg5dNDpMZNmLV4ajhQwJcV9 I31kjPkw/NAAuC3zco1YKcf1iCQ+hKnm42bPvwi56/Sg2nFA5k8HKudNFZn8Cd52wngP0ay2DE/A4 +X8+xpZkD3ls7iBcTuvq36ls83OcFzG0/MNRH1XLhbTiqzdY9IEN/sdJQhIjr12O6AxdDWlHRQj58 7JMu91BVtAIuHsnCzzj3mBZ1y8rKeVBgto7dwwFZzkGbIy7P4dFBpNZ1NXDNS9XTZKw5Xu9IGEfE4 dKlYcJtk1yblzQd+8V9BRCvKu20fL3pobGZL1xekTy1hxTsjvdT/9CnLnchcZynJVmXQExuAXW1dD DFdp4uOFA==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lRxoQ-009kWa-Ky; Thu, 01 Apr 2021 13:56:42 +0000 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lRxoG-009kRP-KT for linux-arm-kernel@lists.infradead.org; Thu, 01 Apr 2021 13:56:34 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1617285391; 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=fL+sm3fDoeQVw/phEkL72DmeE0hZ8upmmmSY12kpjHo=; b=UbIB4jBegsemZQj9OWCcLM09ag+jgpGbxbG79BphO2x1tEEMofaDW+lhvVcdMEXLiFukql lh+TemqtUNMsLougOtDhf/gPjRlN6rXhsj4Ahkfbzk9O03APWMNRjKFL7H343MGlIa9mcb vxtT2aG2VJw9HLDjGW6tGgJxoXdUro4= 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-266-zaaTPaldOCWh5S3hVw1eLA-1; Thu, 01 Apr 2021 09:56:30 -0400 X-MC-Unique: zaaTPaldOCWh5S3hVw1eLA-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 2CDF5107ACCD; Thu, 1 Apr 2021 13:56:27 +0000 (UTC) Received: from localhost.localdomain (unknown [10.35.206.58]) by smtp.corp.redhat.com (Postfix) with ESMTP id A83185D6B1; Thu, 1 Apr 2021 13:56:15 +0000 (UTC) From: Maxim Levitsky To: kvm@vger.kernel.org Cc: x86@kernel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)), Ingo Molnar , Andrew Morton , Thomas Gleixner , Sean Christopherson , Marc Zyngier , Catalin Marinas , linux-kernel@vger.kernel.org (open list), Julien Thierry , Stefano Garzarella , Borislav Petkov , Suzuki K Poulose , Jonathan Corbet , Jessica Yu , "H. Peter Anvin" , Jan Kiszka , Will Deacon , kvmarm@lists.cs.columbia.edu (open list:KERNEL VIRTUAL MACHINE FOR ARM64 (KVM/arm64)), Paolo Bonzini , Vitaly Kuznetsov , Vasily Gorbik , Joerg Roedel , Claudio Imbrenda , Jim Mattson , Cornelia Huck , David Hildenbrand , Maxim Levitsky , Wanpeng Li , Janosch Frank , Christian Borntraeger , linux-s390@vger.kernel.org (open list:S390), Heiko Carstens , Kieran Bingham , linux-doc@vger.kernel.org (open list:DOCUMENTATION), linux-arm-kernel@lists.infradead.org (moderated list:KERNEL VIRTUAL MACHINE FOR ARM64 (KVM/arm64)), James Morse , Borislav Petkov Subject: [PATCH v2 8/9] KVM: x86: add force_intercept_exceptions_mask Date: Thu, 1 Apr 2021 16:54:50 +0300 Message-Id: <20210401135451.1004564-9-mlevitsk@redhat.com> In-Reply-To: <20210401135451.1004564-1-mlevitsk@redhat.com> References: <20210401135451.1004564-1-mlevitsk@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210401_145632_788762_2A9F21A5 X-CRM114-Status: GOOD ( 14.26 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.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 option is not intended for production. 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 3627ce8fe5bb..1a51031d64d8 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -176,6 +176,9 @@ 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 daccf20fbcd5..644480711ff7 100644 --- a/arch/x86/kvm/x86.h +++ b/arch/x86/kvm/x86.h @@ -311,6 +311,8 @@ 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,