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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,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 88879C433E0 for ; Fri, 19 Jun 2020 15:41:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 65D95206FA for ; Fri, 19 Jun 2020 15:41:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="i9Y/1Yow" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2394004AbgFSPlW (ORCPT ); Fri, 19 Jun 2020 11:41:22 -0400 Received: from us-smtp-2.mimecast.com ([207.211.31.81]:20681 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2393866AbgFSPkF (ORCPT ); Fri, 19 Jun 2020 11:40:05 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1592581203; 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=tVRPCFY21ubrTOvxf4j2vFglhRKZ9hHO+8Y6VHRuBL4=; b=i9Y/1YowGwFGPhqJwUVZmXxCJnYY9r7E+oEbxPV6NFxBXQmUDbzVuFj5ZphxBDMW7H1Nzo TrPwdhIrXRdgkCy/1fqdxj9ON+jomCL++xsJQtWbJbIOcomtpyIQdq2IX+oIgzakm15DKC xmHuVFhyZtmi1dmox1MTgvGVHz2+SIU= 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-211-5GQGJmfBPC6tPmnOMHOUhw-1; Fri, 19 Jun 2020 11:39:58 -0400 X-MC-Unique: 5GQGJmfBPC6tPmnOMHOUhw-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id C84A1800EBB; Fri, 19 Jun 2020 15:39:56 +0000 (UTC) Received: from localhost.localdomain.com (ovpn-112-254.ams2.redhat.com [10.36.112.254]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8F12060BF4; Fri, 19 Jun 2020 15:39:54 +0000 (UTC) From: Mohammed Gamal To: kvm@vger.kernel.org, pbonzini@redhat.com Cc: linux-kernel@vger.kernel.org, vkuznets@redhat.com, sean.j.christopherson@intel.com, wanpengli@tencent.com, jmattson@google.com, joro@8bytes.org, thomas.lendacky@amd.com, babu.moger@amd.com Subject: [PATCH v2 06/11] KVM: VMX: introduce vmx_need_pf_intercept Date: Fri, 19 Jun 2020 17:39:20 +0200 Message-Id: <20200619153925.79106-7-mgamal@redhat.com> In-Reply-To: <20200619153925.79106-1-mgamal@redhat.com> References: <20200619153925.79106-1-mgamal@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Paolo Bonzini Signed-off-by: Paolo Bonzini --- arch/x86/kvm/vmx/nested.c | 28 +++++++++++++++++----------- arch/x86/kvm/vmx/vmx.c | 2 +- arch/x86/kvm/vmx/vmx.h | 5 +++++ 3 files changed, 23 insertions(+), 12 deletions(-) diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c index d1af20b050a8..328411919518 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -2433,22 +2433,28 @@ static void prepare_vmcs02_rare(struct vcpu_vmx *vmx, struct vmcs12 *vmcs12) /* * Whether page-faults are trapped is determined by a combination of - * 3 settings: PFEC_MASK, PFEC_MATCH and EXCEPTION_BITMAP.PF. - * If enable_ept, L0 doesn't care about page faults and we should - * set all of these to L1's desires. However, if !enable_ept, L0 does - * care about (at least some) page faults, and because it is not easy - * (if at all possible?) to merge L0 and L1's desires, we simply ask - * to exit on each and every L2 page fault. This is done by setting - * MASK=MATCH=0 and (see below) EB.PF=1. + * 3 settings: PFEC_MASK, PFEC_MATCH and EXCEPTION_BITMAP.PF. If L0 + * doesn't care about page faults then we should set all of these to + * L1's desires. However, if L0 does care about (some) page faults, it + * is not easy (if at all possible?) to merge L0 and L1's desires, we + * simply ask to exit on each and every L2 page fault. This is done by + * setting MASK=MATCH=0 and (see below) EB.PF=1. * Note that below we don't need special code to set EB.PF beyond the * "or"ing of the EB of vmcs01 and vmcs12, because when enable_ept, * vmcs01's EB.PF is 0 so the "or" will take vmcs12's value, and when * !enable_ept, EB.PF is 1, so the "or" will always be 1. */ - vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, - enable_ept ? vmcs12->page_fault_error_code_mask : 0); - vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, - enable_ept ? vmcs12->page_fault_error_code_match : 0); + if (vmx_need_pf_intercept(&vmx->vcpu)) { + /* + * TODO: if both L0 and L1 need the same MASK and MATCH, + * go ahead and use it? + */ + vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, 0); + vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, 0); + } else { + vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, vmcs12->page_fault_error_code_mask); + vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, vmcs12->page_fault_error_code_match); + } if (cpu_has_vmx_apicv()) { vmcs_write64(EOI_EXIT_BITMAP0, vmcs12->eoi_exit_bitmap0); diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index f82c42ac87f9..46d522ee5cb1 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -783,7 +783,7 @@ void update_exception_bitmap(struct kvm_vcpu *vcpu) eb |= 1u << BP_VECTOR; if (to_vmx(vcpu)->rmode.vm86_active) eb = ~0; - if (enable_ept) + if (!vmx_need_pf_intercept(vcpu)) eb &= ~(1u << PF_VECTOR); /* When we are running a nested L2 guest and L1 specified for it a diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h index 8a83b5edc820..5e2da15fe94f 100644 --- a/arch/x86/kvm/vmx/vmx.h +++ b/arch/x86/kvm/vmx/vmx.h @@ -552,6 +552,11 @@ static inline bool vmx_has_waitpkg(struct vcpu_vmx *vmx) SECONDARY_EXEC_ENABLE_USR_WAIT_PAUSE; } +static inline bool vmx_need_pf_intercept(struct kvm_vcpu *vcpu) +{ + return !enable_ept; +} + void dump_vmcs(void); #endif /* __KVM_X86_VMX_H */ -- 2.26.2