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=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 B3E3FC10F12 for ; Mon, 15 Apr 2019 20:37:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8795A20880 for ; Mon, 15 Apr 2019 20:37:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727335AbfDOUhP (ORCPT ); Mon, 15 Apr 2019 16:37:15 -0400 Received: from mx1.redhat.com ([209.132.183.28]:51414 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726319AbfDOUhN (ORCPT ); Mon, 15 Apr 2019 16:37:13 -0400 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id D31D133024A; Mon, 15 Apr 2019 20:37:12 +0000 (UTC) Received: from x1.home (ovpn-116-122.phx2.redhat.com [10.3.116.122]) by smtp.corp.redhat.com (Postfix) with ESMTP id B4F3D1001E93; Mon, 15 Apr 2019 20:37:11 +0000 (UTC) Date: Mon, 15 Apr 2019 14:37:11 -0600 From: Alex Williamson To: Jacob Pan Cc: iommu@lists.linux-foundation.org, LKML , Joerg Roedel , David Woodhouse , Jean-Philippe Brucker , "Yi Liu" , "Tian, Kevin" , Raj Ashok , "Christoph Hellwig" , "Lu Baolu" , Andriy Shevchenko Subject: Re: [PATCH 10/18] iommu/vt-d: Add custom allocator for IOASID Message-ID: <20190415143711.13c29308@x1.home> In-Reply-To: <1554767973-30125-11-git-send-email-jacob.jun.pan@linux.intel.com> References: <1554767973-30125-1-git-send-email-jacob.jun.pan@linux.intel.com> <1554767973-30125-11-git-send-email-jacob.jun.pan@linux.intel.com> Organization: Red Hat MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Mon, 15 Apr 2019 20:37:13 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 8 Apr 2019 16:59:25 -0700 Jacob Pan wrote: > When VT-d driver runs in the guest, PASID allocation must be > performed via virtual command interface. This patch register a > custom IOASID allocator which takes precedence over the default > IDR based allocator. The resulting IOASID allocation will always > come from the host. This ensures that PASID namespace is system- > wide. > > Signed-off-by: Lu Baolu > Signed-off-by: Liu, Yi L > Signed-off-by: Jacob Pan > --- > drivers/iommu/intel-iommu.c | 50 +++++++++++++++++++++++++++++++++++++++++++++ > include/linux/intel-iommu.h | 1 + > 2 files changed, 51 insertions(+) > > diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c > index 28cb713..a38d774 100644 > --- a/drivers/iommu/intel-iommu.c > +++ b/drivers/iommu/intel-iommu.c > @@ -4820,6 +4820,42 @@ static int __init platform_optin_force_iommu(void) > return 1; > } > > +static ioasid_t intel_ioasid_alloc(ioasid_t min, ioasid_t max, void *data) > +{ > + struct intel_iommu *iommu = data; > + ioasid_t ioasid; > + > + if (vcmd_alloc_pasid(iommu, &ioasid)) > + return INVALID_IOASID; > + return ioasid; How does this honor min/max? > +} > + > +static int intel_ioasid_free(ioasid_t ioasid, void *data) > +{ > + struct iommu_pasid_alloc_info *svm; > + struct intel_iommu *iommu = data; > + > + if (!iommu || !cap_caching_mode(iommu->cap)) > + return -EINVAL; > + /* > + * Sanity check the ioasid owner is done at upper layer, e.g. VFIO > + * We can only free the PASID when all the devices are unbond. > + */ > + svm = ioasid_find(NULL, ioasid, NULL); > + if (!svm) { > + pr_warn("Freeing unbond IOASID %d\n", ioasid); > + return -EBUSY; > + } > + vcmd_free_pasid(iommu, ioasid); > + > + return 0; > +} > + > +static struct ioasid_allocator intel_iommu_ioasid_allocator = { > + .alloc = intel_ioasid_alloc, > + .free = intel_ioasid_free, > +}; > + > int __init intel_iommu_init(void) > { > int ret = -ENODEV; > @@ -4921,6 +4957,20 @@ int __init intel_iommu_init(void) > "%s", iommu->name); > iommu_device_set_ops(&iommu->iommu, &intel_iommu_ops); > iommu_device_register(&iommu->iommu); > + if (cap_caching_mode(iommu->cap) && sm_supported(iommu)) { > + /* > + * Register a custom ASID allocator if we are running > + * in a guest, the purpose is to have a system wide PASID > + * namespace among all PASID users. > + * Note that only one vIOMMU in each guest is supported. Why one vIOMMU per guest? This would prevent guests with multiple PCI domains aiui. > + */ > + intel_iommu_ioasid_allocator.pdata = (void *)iommu; > + ret = ioasid_set_allocator(&intel_iommu_ioasid_allocator); > + if (ret == -EBUSY) { > + pr_info("Custom IOASID allocator already registered\n"); > + break; > + } > + } > } > > bus_set_iommu(&pci_bus_type, &intel_iommu_ops); > diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h > index b29c85c..bc09d80 100644 > --- a/include/linux/intel-iommu.h > +++ b/include/linux/intel-iommu.h > @@ -31,6 +31,7 @@ > #include > #include > #include > +#include > > #include > #include