From: Lu Baolu <baolu.lu@linux.intel.com> To: "Liu, Yi L" <yi.l.liu@intel.com>, Joerg Roedel <joro@8bytes.org>, David Woodhouse <dwmw2@infradead.org>, Alex Williamson <alex.williamson@redhat.com> Cc: baolu.lu@linux.intel.com, "Raj, Ashok" <ashok.raj@intel.com>, "Kumar, Sanjay K" <sanjay.k.kumar@intel.com>, "jacob.jun.pan@linux.intel.com" <jacob.jun.pan@linux.intel.com>, "Tian, Kevin" <kevin.tian@intel.com>, "Sun, Yi Y" <yi.y.sun@intel.com>, Peter Xu <peterx@redhat.com>, "iommu@lists.linux-foundation.org" <iommu@lists.linux-foundation.org>, "kvm@vger.kernel.org" <kvm@vger.kernel.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org> Subject: Re: [PATCH v4 4/7] iommu/vt-d: Setup pasid entries for iova over first level Date: Sat, 21 Dec 2019 10:26:49 +0800 [thread overview] Message-ID: <84fd6b9e-0226-cc5f-b51a-884f834d4556@linux.intel.com> (raw) In-Reply-To: <A2975661238FB949B60364EF0F2C25743A13A334@SHSMSX104.ccr.corp.intel.com> Hi Yi, On 12/20/19 7:44 PM, Liu, Yi L wrote: >> From: Lu Baolu [mailto:baolu.lu@linux.intel.com] >> Sent: Thursday, December 19, 2019 11:17 AM >> To: Joerg Roedel <joro@8bytes.org>; David Woodhouse <dwmw2@infradead.org>; >> Alex Williamson <alex.williamson@redhat.com> >> Subject: [PATCH v4 4/7] iommu/vt-d: Setup pasid entries for iova over first level >> >> Intel VT-d in scalable mode supports two types of page tables for IOVA translation: >> first level and second level. The IOMMU driver can choose one from both for IOVA >> translation according to the use case. This sets up the pasid entry if a domain is >> selected to use the first-level page table for iova translation. >> >> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> >> --- >> drivers/iommu/intel-iommu.c | 48 +++++++++++++++++++++++++++++++++++-- >> include/linux/intel-iommu.h | 16 ++++++++----- >> 2 files changed, 56 insertions(+), 8 deletions(-) >> >> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index >> 2b5a47584baf..f0813997dea2 100644 >> --- a/drivers/iommu/intel-iommu.c >> +++ b/drivers/iommu/intel-iommu.c >> @@ -571,6 +571,11 @@ static inline int domain_type_is_si(struct dmar_domain >> *domain) >> return domain->flags & DOMAIN_FLAG_STATIC_IDENTITY; } >> >> +static inline bool domain_use_first_level(struct dmar_domain *domain) { >> + return domain->flags & DOMAIN_FLAG_USE_FIRST_LEVEL; } >> + >> static inline int domain_pfn_supported(struct dmar_domain *domain, >> unsigned long pfn) >> { >> @@ -2288,6 +2293,8 @@ static int __domain_mapping(struct dmar_domain >> *domain, unsigned long iov_pfn, >> return -EINVAL; >> >> prot &= DMA_PTE_READ | DMA_PTE_WRITE | DMA_PTE_SNP; >> + if (domain_use_first_level(domain)) >> + prot |= DMA_FL_PTE_PRESENT | DMA_FL_PTE_XD; >> >> if (!sg) { >> sg_res = nr_pages; >> @@ -2515,6 +2522,36 @@ dmar_search_domain_by_dev_info(int segment, int bus, >> int devfn) >> return NULL; >> } >> >> +static int domain_setup_first_level(struct intel_iommu *iommu, >> + struct dmar_domain *domain, >> + struct device *dev, >> + int pasid) >> +{ >> + int flags = PASID_FLAG_SUPERVISOR_MODE; > > Hi Baolu, > > Could you explain a bit why PASID_FLAG_SUPERVISOR_MODE is > required? > This flag indicates a PASID which can be used for access to kernel addresses (static 1:1 only). Otherwise, DMA requests requesting supervisor level privilege level will be blocked. > Regards, > Yi Liu > Best regards, baolu
WARNING: multiple messages have this Message-ID (diff)
From: Lu Baolu <baolu.lu@linux.intel.com> To: "Liu, Yi L" <yi.l.liu@intel.com>, Joerg Roedel <joro@8bytes.org>, David Woodhouse <dwmw2@infradead.org>, Alex Williamson <alex.williamson@redhat.com> Cc: "Tian, Kevin" <kevin.tian@intel.com>, "Raj, Ashok" <ashok.raj@intel.com>, "kvm@vger.kernel.org" <kvm@vger.kernel.org>, "Kumar, Sanjay K" <sanjay.k.kumar@intel.com>, "iommu@lists.linux-foundation.org" <iommu@lists.linux-foundation.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "Sun, Yi Y" <yi.y.sun@intel.com> Subject: Re: [PATCH v4 4/7] iommu/vt-d: Setup pasid entries for iova over first level Date: Sat, 21 Dec 2019 10:26:49 +0800 [thread overview] Message-ID: <84fd6b9e-0226-cc5f-b51a-884f834d4556@linux.intel.com> (raw) In-Reply-To: <A2975661238FB949B60364EF0F2C25743A13A334@SHSMSX104.ccr.corp.intel.com> Hi Yi, On 12/20/19 7:44 PM, Liu, Yi L wrote: >> From: Lu Baolu [mailto:baolu.lu@linux.intel.com] >> Sent: Thursday, December 19, 2019 11:17 AM >> To: Joerg Roedel <joro@8bytes.org>; David Woodhouse <dwmw2@infradead.org>; >> Alex Williamson <alex.williamson@redhat.com> >> Subject: [PATCH v4 4/7] iommu/vt-d: Setup pasid entries for iova over first level >> >> Intel VT-d in scalable mode supports two types of page tables for IOVA translation: >> first level and second level. The IOMMU driver can choose one from both for IOVA >> translation according to the use case. This sets up the pasid entry if a domain is >> selected to use the first-level page table for iova translation. >> >> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> >> --- >> drivers/iommu/intel-iommu.c | 48 +++++++++++++++++++++++++++++++++++-- >> include/linux/intel-iommu.h | 16 ++++++++----- >> 2 files changed, 56 insertions(+), 8 deletions(-) >> >> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index >> 2b5a47584baf..f0813997dea2 100644 >> --- a/drivers/iommu/intel-iommu.c >> +++ b/drivers/iommu/intel-iommu.c >> @@ -571,6 +571,11 @@ static inline int domain_type_is_si(struct dmar_domain >> *domain) >> return domain->flags & DOMAIN_FLAG_STATIC_IDENTITY; } >> >> +static inline bool domain_use_first_level(struct dmar_domain *domain) { >> + return domain->flags & DOMAIN_FLAG_USE_FIRST_LEVEL; } >> + >> static inline int domain_pfn_supported(struct dmar_domain *domain, >> unsigned long pfn) >> { >> @@ -2288,6 +2293,8 @@ static int __domain_mapping(struct dmar_domain >> *domain, unsigned long iov_pfn, >> return -EINVAL; >> >> prot &= DMA_PTE_READ | DMA_PTE_WRITE | DMA_PTE_SNP; >> + if (domain_use_first_level(domain)) >> + prot |= DMA_FL_PTE_PRESENT | DMA_FL_PTE_XD; >> >> if (!sg) { >> sg_res = nr_pages; >> @@ -2515,6 +2522,36 @@ dmar_search_domain_by_dev_info(int segment, int bus, >> int devfn) >> return NULL; >> } >> >> +static int domain_setup_first_level(struct intel_iommu *iommu, >> + struct dmar_domain *domain, >> + struct device *dev, >> + int pasid) >> +{ >> + int flags = PASID_FLAG_SUPERVISOR_MODE; > > Hi Baolu, > > Could you explain a bit why PASID_FLAG_SUPERVISOR_MODE is > required? > This flag indicates a PASID which can be used for access to kernel addresses (static 1:1 only). Otherwise, DMA requests requesting supervisor level privilege level will be blocked. > Regards, > Yi Liu > Best regards, baolu _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
next prev parent reply other threads:[~2019-12-21 2:27 UTC|newest] Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-12-19 3:16 [PATCH v4 0/7] Use 1st-level for IOVA translation Lu Baolu 2019-12-19 3:16 ` Lu Baolu 2019-12-19 3:16 ` [PATCH v4 1/7] iommu/vt-d: Identify domains using first level page table Lu Baolu 2019-12-19 3:16 ` Lu Baolu 2019-12-19 3:16 ` [PATCH v4 2/7] iommu/vt-d: Add set domain DOMAIN_ATTR_NESTING attr Lu Baolu 2019-12-19 3:16 ` Lu Baolu 2019-12-19 3:16 ` [PATCH v4 3/7] iommu/vt-d: Add PASID_FLAG_FL5LP for first-level pasid setup Lu Baolu 2019-12-19 3:16 ` Lu Baolu 2019-12-19 3:16 ` [PATCH v4 4/7] iommu/vt-d: Setup pasid entries for iova over first level Lu Baolu 2019-12-19 3:16 ` Lu Baolu 2019-12-20 11:44 ` Liu, Yi L 2019-12-20 11:44 ` Liu, Yi L 2019-12-21 2:26 ` Lu Baolu [this message] 2019-12-21 2:26 ` Lu Baolu 2019-12-19 3:16 ` [PATCH v4 5/7] iommu/vt-d: Flush PASID-based iotlb " Lu Baolu 2019-12-19 3:16 ` Lu Baolu 2019-12-19 3:16 ` [PATCH v4 6/7] iommu/vt-d: Use " Lu Baolu 2019-12-19 3:16 ` Lu Baolu 2019-12-19 3:16 ` [PATCH v4 7/7] iommu/vt-d: debugfs: Add support to show page table internals Lu Baolu 2019-12-19 3:16 ` Lu Baolu 2019-12-20 11:50 ` [PATCH v4 0/7] Use 1st-level for IOVA translation Liu, Yi L 2019-12-20 11:50 ` Liu, Yi L 2019-12-21 2:51 ` Lu Baolu 2019-12-21 2:51 ` Lu Baolu 2019-12-21 3:14 ` Lu Baolu 2019-12-21 3:14 ` Lu Baolu 2019-12-22 7:00 ` Lu Baolu 2019-12-22 7:00 ` Lu Baolu
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