From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:45124 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751686AbdATKnG (ORCPT ); Fri, 20 Jan 2017 05:43:06 -0500 Received: from pps.filterd (m0098414.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v0K7dHdO098771 for ; Fri, 20 Jan 2017 02:42:00 -0500 Received: from e37.co.us.ibm.com (e37.co.us.ibm.com [32.97.110.158]) by mx0b-001b2d01.pphosted.com with ESMTP id 2836xsehdb-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Fri, 20 Jan 2017 02:42:00 -0500 Received: from localhost by e37.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 20 Jan 2017 00:41:59 -0700 From: Yongji Xie To: bhelgaas@google.com Cc: linux-pci@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, alex.williamson@redhat.com, gwshan@linux.vnet.ibm.com, aik@ozlabs.ru, benh@kernel.crashing.org, mpe@ellerman.id.au, paulus@samba.org, zhong@linux.vnet.ibm.com Subject: [PATCH v8 0/3] PCI: Introduce a way to enforce all MMIO BARs not to share PAGE_SIZE Date: Fri, 20 Jan 2017 15:41:50 +0800 Message-Id: <1484898113-24939-1-git-send-email-xyjxie@linux.vnet.ibm.com> Sender: linux-pci-owner@vger.kernel.org List-ID: This series introduces a way for PCI resource allocator to force MMIO BARs not to share PAGE_SIZE. This would make sense to VFIO driver. Because current VFIO implementation disallows to mmap sub-page(size < PAGE_SIZE) MMIO BARs which may share the same page with other BARs for security reasons. Thus, we have to handle mmio access to these BARs in QEMU emulation rather than in guest which will cause some performance loss. In our solution, we try to make use of the existing code path of resource_alignment kernel parameter and add a macro to set default alignment for it. Thus we can define this macro by default on some archs which may easily hit the performance issue because of their 64K page. In this series, patch 1,2 fixed bugs of using resource_alignment; patch 3 adds a macro to set the default alignment of all MMIO BARs. Changelog v8: - Rebased against v4.10-rc4 - Rework the patch 2 - Change the commit log of patch 1 Changelog v7: - Rebased against v4.9-rc2 - Drop two merged patches - Rework the patch which fix a bug that resources's size is changed when using resource_alignment - Add a patch that fix a bug for IOV BARs when using resource_alignment Changelog v6: - Remove the option "noresize@" of resource_alignment Changelog v5: - Rebased against v4.8-rc6 - Drop the patch that forbidding disable memory decoding in pci_reassigndev_resource_alignment() Changelog v4: - Rebased against v4.8-rc1 - Drop one irrelevant patch - Drop the patch that adding wildcard to resource_alignment to enforce the alignment of all MMIO BARs to be at least PAGE_SIZE - Change the format of option "noresize" of resource_alignment - Code style improvements Changelog v3: - Ignore enforced alignment to fixed BARs - Fix issue that disabling memory decoding when reassigning the alignment - Only enable default alignment on PowerNV platform Changelog v2: - Ignore enforced alignment to VF BARs on pci_reassigndev_resource_alignment() Yongji Xie (3): PCI: Ignore requested alignment for IOV BARs PCI: Make sure the driver could get correct BAR size from pci_resource_len() PCI: Add a macro to set default alignment for all PCI devices arch/powerpc/include/asm/pci.h | 4 ++++ drivers/pci/pci.c | 6 +++++- include/linux/pci.h | 6 +++++- 3 files changed, 14 insertions(+), 2 deletions(-) -- 1.7.9.5