From patchwork Fri Jan 10 16:04:01 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?q?Roger_Pau_Monn=C3=A9?= X-Patchwork-Id: 11327813 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 AD878109A for ; Fri, 10 Jan 2020 16:06:06 +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 8A11220838 for ; Fri, 10 Jan 2020 16:06:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=citrix.com header.i=@citrix.com header.b="P3VDFQAb" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8A11220838 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=citrix.com Authentication-Results: mail.kernel.org; spf=none 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 4.89) (envelope-from ) id 1ipwm5-0008U7-Gj; Fri, 10 Jan 2020 16:04:37 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1ipwm3-0008Ty-SH for xen-devel@lists.xenproject.org; Fri, 10 Jan 2020 16:04:35 +0000 X-Inumbo-ID: e0144e44-33c2-11ea-ac27-bc764e2007e4 Received: from esa5.hc3370-68.iphmx.com (unknown [216.71.155.168]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id e0144e44-33c2-11ea-ac27-bc764e2007e4; Fri, 10 Jan 2020 16:04:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=citrix.com; s=securemail; t=1578672266; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=J3jkwhbkYBTQPFeoMX+4Kq27RChxu9RkHpM2LNf45nw=; b=P3VDFQAbmAVwTpqfTt9V1QNlnVZsVxU5YPF4J6O1PJFNjObo6/j0LchR 6W7fZOfIsCEo6cTaW2Z8AonguZ4l1/to6YnBsw3S3vaWUypZ0cRuR8iWK 8PKb0caHdRV6KaIfVTlp4aWdl/zxrHyT735adFaf5dWK90LKMfHoGXWrP Q=; Authentication-Results: esa5.hc3370-68.iphmx.com; dkim=none (message not signed) header.i=none; spf=None smtp.pra=roger.pau@citrix.com; spf=Pass smtp.mailfrom=roger.pau@citrix.com; spf=None smtp.helo=postmaster@mail.citrix.com Received-SPF: None (esa5.hc3370-68.iphmx.com: no sender authenticity information available from domain of roger.pau@citrix.com) identity=pra; client-ip=162.221.158.21; receiver=esa5.hc3370-68.iphmx.com; envelope-from="roger.pau@citrix.com"; x-sender="roger.pau@citrix.com"; x-conformance=sidf_compatible Received-SPF: Pass (esa5.hc3370-68.iphmx.com: domain of roger.pau@citrix.com designates 162.221.158.21 as permitted sender) identity=mailfrom; client-ip=162.221.158.21; receiver=esa5.hc3370-68.iphmx.com; envelope-from="roger.pau@citrix.com"; x-sender="roger.pau@citrix.com"; x-conformance=sidf_compatible; x-record-type="v=spf1"; x-record-text="v=spf1 ip4:209.167.231.154 ip4:178.63.86.133 ip4:195.66.111.40/30 ip4:85.115.9.32/28 ip4:199.102.83.4 ip4:192.28.146.160 ip4:192.28.146.107 ip4:216.52.6.88 ip4:216.52.6.188 ip4:162.221.158.21 ip4:162.221.156.83 ip4:168.245.78.127 ~all" Received-SPF: None (esa5.hc3370-68.iphmx.com: no sender authenticity information available from domain of postmaster@mail.citrix.com) identity=helo; client-ip=162.221.158.21; receiver=esa5.hc3370-68.iphmx.com; envelope-from="roger.pau@citrix.com"; x-sender="postmaster@mail.citrix.com"; x-conformance=sidf_compatible IronPort-SDR: Qu+okuvZZTFWVC2OSlNp3A0j8bp79jSX8eIg14EKHGw4P8NWePk7BQHgHxZovgUsQJob2lydjy hc2nRi1RtGeaJ68aPNg8bPAw4IzOdSQQfJySu07O2BU4if3AFzymFa/hPbEPh6LoTMrctpZrYj r1eCN+MU94UWNgL3/ZY8j2vQD7VkE0kaUZrDyiJc5cbLePMZqOQMTyN/Y3TqmHdrc5MY/LZXtH CJA3OEHZF0rqXZwBWnKq09VVk26wUhlbreRc5t+ODRiAJKpE8y0K36v8ZbW1sywZDvls5SBMBb Cc4= X-SBRS: 2.7 X-MesageID: 11122722 X-Ironport-Server: esa5.hc3370-68.iphmx.com X-Remote-IP: 162.221.158.21 X-Policy: $RELAYED X-IronPort-AV: E=Sophos;i="5.69,417,1571716800"; d="scan'208";a="11122722" From: Roger Pau Monne To: Date: Fri, 10 Jan 2020 17:04:01 +0100 Message-ID: <20200110160404.15573-1-roger.pau@citrix.com> X-Mailer: git-send-email 2.24.1 MIME-Version: 1.0 Subject: [Xen-devel] [PATCH v2 0/3] x86: improve assisted tlb flush and use it in guest mode X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Andrew Cooper , Paul Durrant , Wei Liu , Jan Beulich , Roger Pau Monne Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" Hello, The following series aims to improve the TLB flush times when running nested Xen, and it's specially beneficial when running in shim mode. Patch #2 is likely the most controversial one, as it changes the implementation of assisted TLB flushes. I have to admit I haven't been able to figure out why HVM guest context flushes issued a flush_tlb_mask, and the commit introducing such behavior doesn't contain a helpful commit message. See patch #3 for a comparison on the performance of the L0 assisted flush vs using x2APIC shorthand. Thanks, Roger. Roger Pau Monne (3): x86/hvm: allow ASID flush when v != current x86/hvm: rework HVMOP_flush_tlbs x86/tlb: use Xen L0 assisted TLB flush when available xen/arch/x86/guest/hypervisor.c | 9 +++++ xen/arch/x86/guest/xen/xen.c | 6 +++ xen/arch/x86/hvm/asid.c | 6 +-- xen/arch/x86/hvm/hvm.c | 54 +++++++++++--------------- xen/arch/x86/hvm/viridian/viridian.c | 7 +--- xen/arch/x86/smp.c | 6 +++ xen/include/asm-x86/guest/hypervisor.h | 13 +++++++ xen/include/asm-x86/hvm/hvm.h | 2 +- 8 files changed, 62 insertions(+), 41 deletions(-)