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 A3372C352A3 for ; Tue, 11 Feb 2020 13:53:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6A3FF24650 for ; Tue, 11 Feb 2020 13:53:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729684AbgBKNxj (ORCPT ); Tue, 11 Feb 2020 08:53:39 -0500 Received: from 8bytes.org ([81.169.241.247]:52410 "EHLO theia.8bytes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729565AbgBKNx1 (ORCPT ); Tue, 11 Feb 2020 08:53:27 -0500 Received: by theia.8bytes.org (Postfix, from userid 1000) id 20CAFE8E; Tue, 11 Feb 2020 14:53:15 +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 44/62] x86/sev-es: Handle RDTSC Events Date: Tue, 11 Feb 2020 14:52:38 +0100 Message-Id: <20200211135256.24617-45-joro@8bytes.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200211135256.24617-1-joro@8bytes.org> References: <20200211135256.24617-1-joro@8bytes.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tom Lendacky Implement a handler for #VC exceptions caused by RDTSC instructions. Signed-off-by: Tom Lendacky [ jroedel@suse.de: Adapt to #VC handling infrastructure ] Co-developed-by: Joerg Roedel Signed-off-by: Joerg Roedel --- arch/x86/kernel/sev-es.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/arch/x86/kernel/sev-es.c b/arch/x86/kernel/sev-es.c index 491537b770fd..061557515f75 100644 --- a/arch/x86/kernel/sev-es.c +++ b/arch/x86/kernel/sev-es.c @@ -272,6 +272,23 @@ static enum es_result handle_wbinvd(struct ghcb *ghcb, return ghcb_hv_call(ghcb, ctxt, SVM_EXIT_WBINVD, 0, 0); } +static enum es_result handle_rdtsc(struct ghcb *ghcb, struct es_em_ctxt *ctxt) +{ + enum es_result ret; + + ret = ghcb_hv_call(ghcb, ctxt, SVM_EXIT_RDTSC, 0, 0); + if (ret != ES_OK) + return ret; + + if (!(ghcb_is_valid_rax(ghcb) && ghcb_is_valid_rdx(ghcb))) + return ES_VMM_ERROR; + + ctxt->regs->ax = ghcb->save.rax; + ctxt->regs->dx = ghcb->save.rdx; + + return ES_OK; +} + static enum es_result handle_vc_exception(struct es_em_ctxt *ctxt, struct ghcb *ghcb, unsigned long exit_code, @@ -286,6 +303,9 @@ static enum es_result handle_vc_exception(struct es_em_ctxt *ctxt, case SVM_EXIT_WRITE_DR7: result = handle_dr7_write(ghcb, ctxt, early); break; + case SVM_EXIT_RDTSC: + result = handle_rdtsc(ghcb, ctxt); + break; case SVM_EXIT_CPUID: result = handle_cpuid(ghcb, ctxt); break; -- 2.17.1