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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT 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 88FB2C4332D for ; Thu, 19 Mar 2020 09:16:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 588A820722 for ; Thu, 19 Mar 2020 09:16:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726785AbgCSJQD (ORCPT ); Thu, 19 Mar 2020 05:16:03 -0400 Received: from 8bytes.org ([81.169.241.247]:53144 "EHLO theia.8bytes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727483AbgCSJOq (ORCPT ); Thu, 19 Mar 2020 05:14:46 -0400 Received: by theia.8bytes.org (Postfix, from userid 1000) id 7DE5DEC5; Thu, 19 Mar 2020 10:14:27 +0100 (CET) From: Joerg Roedel To: x86@kernel.org Cc: hpa@zytor.com, Andy Lutomirski , Dave Hansen , Peter Zijlstra , Thomas Hellstrom , Jiri Slaby , Dan Williams , Tom Lendacky , Juergen Gross , Kees Cook , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, Joerg Roedel , Joerg Roedel Subject: [PATCH 60/70] x86/sev-es: Handle #DB Events Date: Thu, 19 Mar 2020 10:13:57 +0100 Message-Id: <20200319091407.1481-61-joro@8bytes.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200319091407.1481-1-joro@8bytes.org> References: <20200319091407.1481-1-joro@8bytes.org> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Joerg Roedel Handle #VC exceptions caused by #DB exceptions in the guest. Do not forward them to the hypervisor and handle them with do_debug() instead. Signed-off-by: Joerg Roedel --- arch/x86/kernel/sev-es.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/arch/x86/kernel/sev-es.c b/arch/x86/kernel/sev-es.c index f22b361f6b60..bc553aae31d2 100644 --- a/arch/x86/kernel/sev-es.c +++ b/arch/x86/kernel/sev-es.c @@ -752,6 +752,15 @@ static enum es_result vc_handle_vmmcall(struct ghcb *ghcb, return ES_OK; } +static enum es_result vc_handle_db_exception(struct ghcb *ghcb, + struct es_em_ctxt *ctxt) +{ + do_debug(ctxt->regs, 0); + + /* Exception event, do not advance RIP */ + return ES_RETRY; +} + static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt, struct ghcb *ghcb, unsigned long exit_code, @@ -766,6 +775,9 @@ static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt, case SVM_EXIT_WRITE_DR7: result = vc_handle_dr7_write(ghcb, ctxt, early); break; + case SVM_EXIT_EXCP_BASE + X86_TRAP_DB: + result = vc_handle_db_exception(ghcb, ctxt); + break; case SVM_EXIT_EXCP_BASE + X86_TRAP_AC: do_alignment_check(ctxt->regs, 0); result = ES_RETRY; -- 2.17.1