linux-kernel - Re: [PATCH 2/9] iommu/vt-d: add bind_pasid

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 linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20170628100202.GF14532@8bytes.org>
Date:   Wed, 28 Jun 2017 12:02:03 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:     iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        David Woodhouse <dwmw2@...radead.org>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        Lan Tianyu <tianyu.lan@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jean Delvare <khali@...ux-fr.org>, Liu@...tes.org,
        Yi L <yi.l.liu@...ux.intel.com>
Subject: Re: [PATCH 2/9] iommu/vt-d: add bind_pasid_table function

On Tue, Jun 27, 2017 at 12:47:56PM -0700, Jacob Pan wrote:
> Add Intel VT-d ops to the generic iommu_bind_pasid_table API
> functions.
> 
> The primary use case is for direct assignment of SVM capable
> device. Originated from emulated IOMMU in the guest, the request goes
> through many layers (e.g. VFIO). Upon calling host IOMMU driver, caller
> passes guest PASID table pointer (GPA) and size.
> 
> Device context table entry is modified by Intel IOMMU specific
> bind_pasid_table function. This will turn on nesting mode and matching
> translation type.
> 
> The unbind operation restores default context mapping.
> 
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> Signed-off-by: Liu, Yi L <yi.l.liu@...ux.intel.com>
> Signed-off-by: Ashok Raj <ashok.raj@...el.com>
> ---
>  drivers/iommu/intel-iommu.c   | 117 ++++++++++++++++++++++++++++++++++++++++++
>  include/linux/dma_remapping.h |   1 +
>  2 files changed, 118 insertions(+)
> 
> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
> index 8274ce3..ef05b59 100644
> --- a/drivers/iommu/intel-iommu.c
> +++ b/drivers/iommu/intel-iommu.c
> @@ -5430,6 +5430,119 @@ struct intel_iommu *intel_svm_device_to_iommu(struct device *dev)
>  
>  	return iommu;
>  }
> +
> +static int intel_iommu_bind_pasid_table(struct iommu_domain *domain,
> +		struct device *dev, struct pasid_table_info *pasidt_binfo)
> +{
> +	struct intel_iommu *iommu;
> +	struct context_entry *context;
> +	struct dmar_domain *dmar_domain = to_dmar_domain(domain);
> +	struct device_domain_info *info;
> +	struct pci_dev *pdev;
> +	u8 bus, devfn;
> +	u16 did, *sid;
> +	int ret = 0;
> +	unsigned long flags;
> +	u64 ctx_lo;
> +
> +	if (pasidt_binfo == NULL || pasidt_binfo->model != IOMMU_MODEL_INTEL_VTD) {
> +		pr_warn("%s: Invalid bind request!\n", __func__);
> +		return -EINVAL;
> +	}
> +
> +	iommu = device_to_iommu(dev, &bus, &devfn);
> +	if (!iommu)
> +		return -ENODEV;
> +
> +	sid = (u16 *)&pasidt_binfo->opaque;
> +	/*
> +	 * check SID, if it is not correct, return success to allow looping
> +	 * through all devices within a group
> +	 */
> +	if (PCI_DEVID(bus, devfn) != *sid)
> +		return 0;
> +
> +	if (!dev || !dev_is_pci(dev))
> +		return -ENODEV;
> +
> +	pdev = to_pci_dev(dev);
> +	if (!pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI))
> +		return -EINVAL;
> +
> +	info = dev->archdata.iommu;
> +	if (!info || !info->pasid_supported ||
> +		!pci_enable_pasid(pdev, info->pasid_supported & ~1)) {
> +		pr_err("PCI %04x:%02x:%02x.%d: has no PASID support\n",
> +			       pci_domain_nr(pdev->bus), bus, PCI_SLOT(devfn),
> +			       PCI_FUNC(devfn));

You can either use dev_name() here to decode the device name, or just
use dev_err() instead.