From patchwork Fri Jul 31 14:41:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Paul Durrant X-Patchwork-Id: 11695077 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E0FCB912 for ; Fri, 31 Jul 2020 14:42:02 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (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 BB91322B3F for ; Fri, 31 Jul 2020 14:42:02 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=xen.org header.i=@xen.org header.b="0LxHB8JS" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BB91322B3F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=xen.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1k1WDs-0006HE-0N; Fri, 31 Jul 2020 14:41:24 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1k1WDq-0006FY-EC for xen-devel@lists.xenproject.org; Fri, 31 Jul 2020 14:41:22 +0000 X-Inumbo-ID: e3786e27-d33b-11ea-abc5-12813bfff9fa Received: from mail.xenproject.org (unknown [104.130.215.37]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id e3786e27-d33b-11ea-abc5-12813bfff9fa; Fri, 31 Jul 2020 14:41:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=xen.org; s=20200302mail; h=Content-Transfer-Encoding:Content-Type:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=sRZ/84+z2kLbSeOy0XdjBV2qQku1iCduFJndgVP5MXY=; b=0LxHB8JSYw88f3jzZO6QHD4VOC qZWFFmlZuEr7nuZvOsT70QpeqFCcDq1bN1MMxZOPGh9nJNF+PIcO8sKA/HoPPux2OgIL+MY4eGv3F MHMnmTPGkAH62ccWYICnnETuVIN/oLCzNDJbvYlX5sMszXzxVAgU6kkGdIBE7nyFGRFQ=; Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1k1WDk-0003vR-Ns; Fri, 31 Jul 2020 14:41:16 +0000 Received: from host86-143-223-30.range86-143.btcentralplus.com ([86.143.223.30] helo=u2f063a87eabd5f.home) by xenbits.xenproject.org with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1k1WDk-0006lb-Ga; Fri, 31 Jul 2020 14:41:16 +0000 From: Paul Durrant To: xen-devel@lists.xenproject.org Subject: [PATCH v4 2/2] x86/hvm: simplify 'mmio_direct' check in epte_get_entry_emt() Date: Fri, 31 Jul 2020 15:41:12 +0100 Message-Id: <20200731144112.12516-3-paul@xen.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200731144112.12516-1-paul@xen.org> References: <20200731144112.12516-1-paul@xen.org> MIME-Version: 1.0 X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Andrew Cooper , Paul Durrant , Wei Liu , Jan Beulich , =?utf-8?q?Roger_Pau_Monn=C3=A9?= Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" From: Paul Durrant Re-factor the code to take advantage of the fact that the APIC access page is a 'special' page. The VMX code is left alone and hence the APIC access page is still inserted into the P2M with type p2m_mmio_direct. This is left alone as it is not obvious there is another suitable type to use, and the necessary re-ordering in epte_get_entry_emt() is straightforward. Suggested-by: Jan Beulich Signed-off-by: Paul Durrant --- Cc: Jan Beulich Cc: Andrew Cooper Cc: Wei Liu Cc: "Roger Pau Monné" v2: - New in v2 v3: - Re-base - Expand commit comment --- xen/arch/x86/hvm/mtrr.c | 15 ++++----------- 1 file changed, 4 insertions(+), 11 deletions(-) diff --git a/xen/arch/x86/hvm/mtrr.c b/xen/arch/x86/hvm/mtrr.c index 2bd64e8025..fb051d59c3 100644 --- a/xen/arch/x86/hvm/mtrr.c +++ b/xen/arch/x86/hvm/mtrr.c @@ -815,23 +815,13 @@ int epte_get_entry_emt(struct domain *d, unsigned long gfn, mfn_t mfn, return -1; } - if ( direct_mmio ) - { - if ( (mfn_x(mfn) ^ mfn_x(d->arch.hvm.vmx.apic_access_mfn)) >> order ) - return MTRR_TYPE_UNCACHABLE; - if ( order ) - return -1; - *ipat = 1; - return MTRR_TYPE_WRBACK; - } - if ( !mfn_valid(mfn) ) { *ipat = 1; return MTRR_TYPE_UNCACHABLE; } - if ( !is_iommu_enabled(d) && !cache_flush_permitted(d) ) + if ( !direct_mmio && !is_iommu_enabled(d) && !cache_flush_permitted(d) ) { *ipat = 1; return MTRR_TYPE_WRBACK; @@ -848,6 +838,9 @@ int epte_get_entry_emt(struct domain *d, unsigned long gfn, mfn_t mfn, } } + if ( direct_mmio ) + return MTRR_TYPE_UNCACHABLE; + gmtrr_mtype = hvm_get_mem_pinned_cacheattr(d, _gfn(gfn), order); if ( gmtrr_mtype >= 0 ) {