lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Thu, 14 Jan 2021 09:30:02 +0800 From: Lu Baolu <baolu.lu@...ux.intel.com> To: tglx@...utronix.de, ashok.raj@...el.com, kevin.tian@...el.com, dave.jiang@...el.com, megha.dey@...el.com, dwmw2@...radead.org Cc: alex.williamson@...hat.com, bhelgaas@...gle.com, dan.j.williams@...el.com, will@...nel.org, joro@...tes.org, dmaengine@...r.kernel.org, eric.auger@...hat.com, jacob.jun.pan@...el.com, jgg@...lanox.com, kvm@...r.kernel.org, kwankhede@...dia.com, linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org, iommu@...ts.linux-foundation.org, maz@...nel.org, mona.hossain@...el.com, netanelg@...lanox.com, parav@...lanox.com, pbonzini@...hat.com, rafael@...nel.org, samuel.ortiz@...el.com, sanjay.k.kumar@...el.com, shahafs@...lanox.com, tony.luck@...el.com, vkoul@...nel.org, yan.y.zhao@...ux.intel.com, yi.l.liu@...el.com, leon@...nel.org, Lu Baolu <baolu.lu@...ux.intel.com> Subject: [RFC PATCH v3 1/2] iommu: Add capability IOMMU_CAP_VIOMMU Some vendor IOMMU drivers are able to declare that it is running in a VM context. This is very valuable for the features that only want to be supported on bare metal. Add a capability bit so that it could be used. Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com> --- drivers/iommu/intel/iommu.c | 20 ++++++++++++++++++++ drivers/iommu/virtio-iommu.c | 9 +++++++++ include/linux/iommu.h | 1 + 3 files changed, 30 insertions(+) diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index cb205a04fe4c..8eb022d0e8aa 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -5738,12 +5738,32 @@ static inline bool nested_mode_support(void) return ret; } +static inline bool caching_mode_enabled(void) +{ + struct dmar_drhd_unit *drhd; + struct intel_iommu *iommu; + bool ret = false; + + rcu_read_lock(); + for_each_active_iommu(iommu, drhd) { + if (cap_caching_mode(iommu->cap)) { + ret = true; + break; + } + } + rcu_read_unlock(); + + return ret; +} + static bool intel_iommu_capable(enum iommu_cap cap) { if (cap == IOMMU_CAP_CACHE_COHERENCY) return domain_update_iommu_snooping(NULL) == 1; if (cap == IOMMU_CAP_INTR_REMAP) return irq_remapping_enabled == 1; + if (cap == IOMMU_CAP_VIOMMU) + return caching_mode_enabled(); return false; } diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c index 2bfdd5734844..719793e103db 100644 --- a/drivers/iommu/virtio-iommu.c +++ b/drivers/iommu/virtio-iommu.c @@ -931,7 +931,16 @@ static int viommu_of_xlate(struct device *dev, struct of_phandle_args *args) return iommu_fwspec_add_ids(dev, args->args, 1); } +static bool viommu_capable(enum iommu_cap cap) +{ + if (cap == IOMMU_CAP_VIOMMU) + return true; + + return false; +} + static struct iommu_ops viommu_ops = { + .capable = viommu_capable, .domain_alloc = viommu_domain_alloc, .domain_free = viommu_domain_free, .attach_dev = viommu_attach_dev, diff --git a/include/linux/iommu.h b/include/linux/iommu.h index b95a6f8db6ff..1d24be667a03 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -94,6 +94,7 @@ enum iommu_cap { transactions */ IOMMU_CAP_INTR_REMAP, /* IOMMU supports interrupt isolation */ IOMMU_CAP_NOEXEC, /* IOMMU_NOEXEC flag */ + IOMMU_CAP_VIOMMU, /* IOMMU can declar running in a VM */ }; /* -- 2.25.1
Powered by blists - more mailing lists