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 X-Spam-Level: X-Spam-Status: No, score=-6.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 9568AC35250 for ; Fri, 7 Feb 2020 18:16:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 78D6121775 for ; Fri, 7 Feb 2020 18:16:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727661AbgBGSQt (ORCPT ); Fri, 7 Feb 2020 13:16:49 -0500 Received: from mx01.bbu.dsd.mx.bitdefender.com ([91.199.104.161]:40778 "EHLO mx01.bbu.dsd.mx.bitdefender.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727564AbgBGSQr (ORCPT ); Fri, 7 Feb 2020 13:16:47 -0500 Received: from smtp.bitdefender.com (smtp01.buh.bitdefender.com [10.17.80.75]) by mx01.bbu.dsd.mx.bitdefender.com (Postfix) with ESMTPS id 2D0EA305D340; Fri, 7 Feb 2020 20:16:40 +0200 (EET) Received: from host.bbu.bitdefender.biz (unknown [195.210.4.22]) by smtp.bitdefender.com (Postfix) with ESMTPSA id 16A403052070; Fri, 7 Feb 2020 20:16:40 +0200 (EET) From: =?UTF-8?q?Adalbert=20Laz=C4=83r?= To: kvm@vger.kernel.org Cc: virtualization@lists.linux-foundation.org, Paolo Bonzini , Sean Christopherson , =?UTF-8?q?Adalbert=20Laz=C4=83r?= Subject: [RFC PATCH v7 34/78] KVM: x86: intercept the write access on sidt and other emulated instructions Date: Fri, 7 Feb 2020 20:15:52 +0200 Message-Id: <20200207181636.1065-35-alazar@bitdefender.com> In-Reply-To: <20200207181636.1065-1-alazar@bitdefender.com> References: <20200207181636.1065-1-alazar@bitdefender.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This is needed for the introspection subsystem to track the changes to descriptor table registers. Signed-off-by: Adalbert Lazăr --- arch/x86/kvm/x86.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 8c6a8d03e41a..6e665341cc80 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -5450,11 +5450,14 @@ static int kvm_write_guest_virt_helper(gva_t addr, void *val, unsigned int bytes if (gpa == UNMAPPED_GVA) return X86EMUL_PROPAGATE_FAULT; + if (!kvm_page_track_prewrite(vcpu, gpa, addr, data, towrite)) + return X86EMUL_RETRY_INSTR; ret = kvm_vcpu_write_guest(vcpu, gpa, data, towrite); if (ret < 0) { r = X86EMUL_IO_NEEDED; goto out; } + kvm_page_track_write(vcpu, gpa, addr, data, towrite); bytes -= towrite; data += towrite;