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=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT autolearn=no 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 84489C433F1 for ; Tue, 28 Jul 2020 11:37:59 +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 585FB2065C for ; Tue, 28 Jul 2020 11:37:59 +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="V6P5/adk" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 585FB2065C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=citrix.com 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 1k0NvP-0006D0-U6; Tue, 28 Jul 2020 11:37:39 +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 1k0NvO-0006Bw-PZ for xen-devel@lists.xenproject.org; Tue, 28 Jul 2020 11:37:38 +0000 X-Inumbo-ID: b98ebc40-d0c6-11ea-a8af-12813bfff9fa Received: from esa3.hc3370-68.iphmx.com (unknown [216.71.145.155]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id b98ebc40-d0c6-11ea-a8af-12813bfff9fa; Tue, 28 Jul 2020 11:37:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=citrix.com; s=securemail; t=1595936253; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=3No2HcQqm9xHBXNjS9kD8Wz1wiCqHR/Ty8ECtIr5Vtg=; b=V6P5/adkx3u7+PqSh8S3wXgaP5TvmvPKjXWo6i135bdDlJuwBzdH90sS aZoSuW5Sv0qHJ5ov4yLPbfsk9/1SXwRg20/uy3VVsTNr5ZDu+29mhMMuR IcJbGhnj7fqOJcXSpXT6uqatKmvQnOnqnVAk32CJmHEofoyIhxKNbsQ+x o=; Authentication-Results: esa3.hc3370-68.iphmx.com; dkim=none (message not signed) header.i=none IronPort-SDR: lDNkjIazj4HQryWxseOpakg+d+ncEDdqGsqTiRxwvfZROzNMooGTh9Q5S1oseHkmy1Q6Ysctvo u3aAEjJYUM864kQXvyL5E7bxYHNRdDIJjeM7ikIecx4ezxYMtWKEtNVzpIligCKQZ7cTrgkoqW VucbE9igE84WEVyZjsGkQoKKKFFDQVNYGVE7h5klzDRWP1lVOZ2zOeepG9bjxPNMaPOub0rQ0M g6bQWpF4LviyPqD8T0p58gvYAPE1/wyVuUrtpTI3Sy7UPyCMGYN2MSzs3WtVlzvNWHOtgwsMw+ 2eY= X-SBRS: 2.7 X-MesageID: 23330306 X-Ironport-Server: esa3.hc3370-68.iphmx.com X-Remote-IP: 162.221.158.21 X-Policy: $RELAYED X-IronPort-AV: E=Sophos;i="5.75,406,1589256000"; d="scan'208";a="23330306" From: Andrew Cooper To: Xen-devel Subject: [PATCH 0/5] Multiple fixes to XENMEM_acquire_resource Date: Tue, 28 Jul 2020 12:37:06 +0100 Message-ID: <20200728113712.22966-1-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.11.0 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit 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: Hubert Jasudowicz , Stefano Stabellini , Julien Grall , Wei Liu , Paul Durrant , Andrew Cooper , =?UTF-8?q?Micha=C5=82=20Leszczy=C5=84ski?= , Jan Beulich , Ian Jackson , Volodymyr Babchuk , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" I thought this was going to be a very simple small bugfix for Michał's Processor Trace series. Serves me right for expecting it not to be full of bear traps... The sole implementation of acquire_resource never asks for size, so its little surprise that Xen is broken for compat callers, and returns incorrect information for regular callers. Patches 1-2 are cleanup with no net functional change. Patches 3-5 are fixes to the size side of this interface, and allow userspace to obtain the actual size of resources. I'm still working on fixing the batch mapping support, which has further sharp corners, especially for compat callers. This is sufficenet of a series so far to post for comments. A branch can be obtained from: https://xenbits.xen.org/gitweb/?p=people/andrewcoop/xen.git;a=shortlog;h=refs/heads/xen-acquire-size Andrew Cooper (5): xen/memory: Introduce CONFIG_ARCH_ACQUIRE_RESOURCE xen/gnttab: Rework resource acquisition xen/memory: Fix compat XENMEM_acquire_resource for size requests xen/memory: Fix acquire_resource size semantics tools/foreignmem: Support querying the size of a resource tools/libs/foreignmemory/Makefile | 2 +- tools/libs/foreignmemory/core.c | 14 +++ .../libs/foreignmemory/include/xenforeignmemory.h | 15 +++ tools/libs/foreignmemory/libxenforeignmemory.map | 4 + tools/libs/foreignmemory/linux.c | 35 +++++++ tools/libs/foreignmemory/private.h | 14 +++ xen/arch/x86/Kconfig | 1 + xen/arch/x86/mm.c | 20 ++++ xen/common/Kconfig | 3 + xen/common/compat/memory.c | 2 +- xen/common/grant_table.c | 112 ++++++++++++++++----- xen/common/memory.c | 85 +++++++--------- xen/include/asm-arm/mm.h | 8 -- xen/include/asm-x86/mm.h | 3 + xen/include/public/memory.h | 16 ++- xen/include/xen/grant_table.h | 21 ++-- xen/include/xen/mm.h | 15 +++ 17 files changed, 273 insertions(+), 97 deletions(-) -- 2.11.0