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bh=qvn7ah9yf4ty3GXyVniTDmRhC/pcWFvbVoRwSMY5+K0=; b=PxlSaHQgPaJZMhUhB/ERIK4y6pavVRlBcWYXtvKNtRNJ73sHhVv4nkos/F2zsBgtm+NcCE +5rsoOdvQQDjWiJn7a0KiKutg06yZzQwcMan5qsPBqr1mpmtE6Bdklny3asgUi+uZ9PDfM 0FFROadcd5wigd7FjDL+/X+dZWx16OM= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-474-Oax_5lNPP8a5oDpzki4syg-1; Sun, 19 Jul 2020 12:06:13 -0400 X-MC-Unique: Oax_5lNPP8a5oDpzki4syg-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 5984A1005504; Sun, 19 Jul 2020 16:06:11 +0000 (UTC) Received: from [10.36.115.54] (ovpn-115-54.ams2.redhat.com [10.36.115.54]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 398A472E45; Sun, 19 Jul 2020 16:06:02 +0000 (UTC) Subject: Re: [PATCH v5 09/15] iommu/vt-d: Check ownership for PASIDs from user-space To: Liu Yi L , alex.williamson@redhat.com, baolu.lu@linux.intel.com, joro@8bytes.org References: <1594552870-55687-1-git-send-email-yi.l.liu@intel.com> <1594552870-55687-10-git-send-email-yi.l.liu@intel.com> From: Auger Eric Message-ID: Date: Sun, 19 Jul 2020 18:06:00 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <1594552870-55687-10-git-send-email-yi.l.liu@intel.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Cc: jean-philippe@linaro.org, kevin.tian@intel.com, ashok.raj@intel.com, kvm@vger.kernel.org, stefanha@gmail.com, jun.j.tian@intel.com, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, yi.y.sun@intel.com, hao.wu@intel.com X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" Hi Yi, On 7/12/20 1:21 PM, Liu Yi L wrote: > When an IOMMU domain with nesting attribute is used for guest SVA, a > system-wide PASID is allocated for binding with the device and the domain. > For security reason, we need to check the PASID passsed from user-space. passed > e.g. page table bind/unbind and PASID related cache invalidation. > > Cc: Kevin Tian > CC: Jacob Pan > Cc: Alex Williamson > Cc: Eric Auger > Cc: Jean-Philippe Brucker > Cc: Joerg Roedel > Cc: Lu Baolu > Signed-off-by: Liu Yi L > Signed-off-by: Jacob Pan > --- > drivers/iommu/intel/iommu.c | 10 ++++++++++ > drivers/iommu/intel/svm.c | 7 +++++-- > 2 files changed, 15 insertions(+), 2 deletions(-) > > diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c > index 4d54198..a9504cb 100644 > --- a/drivers/iommu/intel/iommu.c > +++ b/drivers/iommu/intel/iommu.c > @@ -5436,6 +5436,7 @@ intel_iommu_sva_invalidate(struct iommu_domain *domain, struct device *dev, > int granu = 0; > u64 pasid = 0; > u64 addr = 0; > + void *pdata; > > granu = to_vtd_granularity(cache_type, inv_info->granularity); > if (granu == -EINVAL) { > @@ -5456,6 +5457,15 @@ intel_iommu_sva_invalidate(struct iommu_domain *domain, struct device *dev, > (inv_info->granu.addr_info.flags & IOMMU_INV_ADDR_FLAGS_PASID)) > pasid = inv_info->granu.addr_info.pasid; > > + pdata = ioasid_find(dmar_domain->ioasid_sid, pasid, NULL); > + if (!pdata) { > + ret = -EINVAL; > + goto out_unlock; > + } else if (IS_ERR(pdata)) { > + ret = PTR_ERR(pdata); > + goto out_unlock; > + } > + > switch (BIT(cache_type)) { > case IOMMU_CACHE_INV_TYPE_IOTLB: > /* HW will ignore LSB bits based on address mask */ > diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c > index d2c0e1a..212dee0 100644 > --- a/drivers/iommu/intel/svm.c > +++ b/drivers/iommu/intel/svm.c > @@ -319,7 +319,7 @@ int intel_svm_bind_gpasid(struct iommu_domain *domain, struct device *dev, > dmar_domain = to_dmar_domain(domain); > > mutex_lock(&pasid_mutex); > - svm = ioasid_find(INVALID_IOASID_SET, data->hpasid, NULL); I do not get what the call was supposed to do before that patch? > + svm = ioasid_find(dmar_domain->ioasid_sid, data->hpasid, NULL); > if (IS_ERR(svm)) { > ret = PTR_ERR(svm); > goto out; > @@ -436,6 +436,7 @@ int intel_svm_unbind_gpasid(struct iommu_domain *domain, > struct device *dev, ioasid_t pasid) > { > struct intel_iommu *iommu = intel_svm_device_to_iommu(dev); > + struct dmar_domain *dmar_domain; > struct intel_svm_dev *sdev; > struct intel_svm *svm; > int ret = -EINVAL; > @@ -443,8 +444,10 @@ int intel_svm_unbind_gpasid(struct iommu_domain *domain, > if (WARN_ON(!iommu)) > return -EINVAL; > > + dmar_domain = to_dmar_domain(domain); > + > mutex_lock(&pasid_mutex); > - svm = ioasid_find(INVALID_IOASID_SET, pasid, NULL); > + svm = ioasid_find(dmar_domain->ioasid_sid, pasid, NULL); just to make sure, about the locking, can't domain->ioasid_sid change under the hood? Thanks Eric > if (!svm) { > ret = -EINVAL; > goto out; > _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu