linux-kernel - Re: [PATCH v2 10/19] iommu/vt-d: Add custom allocator for IOASID

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Date:   Wed, 24 Apr 2019 19:27:26 +0200
From:   Auger Eric <eric.auger@...hat.com>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jean-Philippe Brucker <jean-philippe.brucker@....com>
Cc:     Yi Liu <yi.l.liu@...el.com>, "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Andriy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH v2 10/19] iommu/vt-d: Add custom allocator for IOASID

Hi Jacob,

On 4/24/19 1:31 AM, Jacob Pan wrote:
> When VT-d driver runs in the guest, PASID allocation must be
> performed via virtual command interface. This patch register a
registers
> custom IOASID allocator which takes precedence over the default
> IDR based allocator.
nit: s/IDR based// . It is xarray based now.
 The resulting IOASID allocation will always
> come from the host. This ensures that PASID namespace is system-
> wide.
> 
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> Signed-off-by: Liu, Yi L <yi.l.liu@...el.com>
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> ---
>  drivers/iommu/intel-iommu.c | 58 +++++++++++++++++++++++++++++++++++++++++++++
>  include/linux/intel-iommu.h |  2 ++
>  2 files changed, 60 insertions(+)
> 
> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
> index d93c4bd..ec6f22d 100644
> --- a/drivers/iommu/intel-iommu.c
> +++ b/drivers/iommu/intel-iommu.c
> @@ -1711,6 +1711,8 @@ static void free_dmar_iommu(struct intel_iommu *iommu)
>  		if (ecap_prs(iommu->ecap))
>  			intel_svm_finish_prq(iommu);
>  	}
> +	ioasid_unregister_allocator(&iommu->pasid_allocator);
> +
>  #endif
>  }
>  
> @@ -4811,6 +4813,46 @@ 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;
> +
> +	/*
> +	 * VT-d virtual command interface always uses the full 20 bit
> +	 * PASID range. Host can partition guest PASID range based on
> +	 * policies but it is out of guest's control.
> +	 */
The above comment does not exactly relate to the check below
> +	if (min < PASID_MIN || max > PASID_MAX)
> +		return -EINVAL;
> +
> +	if (vcmd_alloc_pasid(iommu, &ioasid))
> +		return INVALID_IOASID;
> +
> +	return ioasid;
> +}
> +
> +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;
can !cap_caching_mode(iommu->cap) be true as the allocator only is set
if CM?
> +	/*
> +	 * 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) {
you can avoid using the local svm variable.
> +		pr_warn("Freeing unbond IOASID %d\n", ioasid);
unbound
> +		return -EBUSY;
-EINVAL?
> +	}
> +	vcmd_free_pasid(iommu, ioasid);
> +
> +	return 0;
> +}
> +
>  int __init intel_iommu_init(void)
>  {
>  	int ret = -ENODEV;
> @@ -4912,6 +4954,22 @@ 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)) {
so shouldn't you test VCCAP_REG as well?
> +			/*
> +			 * 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.
> +			 * There can be multiple vIOMMUs in each guest but only
> +			 * one allocator is active. All vIOMMU allocators will
> +			 * eventually be calling the same host allocator.
> +			 */
> +			iommu->pasid_allocator.alloc = intel_ioasid_alloc;
> +			iommu->pasid_allocator.free = intel_ioasid_free;
> +			iommu->pasid_allocator.pdata = (void *)iommu;
> +			ret = ioasid_register_allocator(&iommu->pasid_allocator);
> +			if (ret)
> +				pr_warn("Custom PASID allocator registeration failed\n");
registration
> +		}
>  	}
>  
>  	bus_set_iommu(&pci_bus_type, &intel_iommu_ops);
> diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
> index bff907b..c24c8aa 100644
> --- a/include/linux/intel-iommu.h
> +++ b/include/linux/intel-iommu.h
> @@ -31,6 +31,7 @@
>  #include <linux/iommu.h>
>  #include <linux/io-64-nonatomic-lo-hi.h>
>  #include <linux/dmar.h>
> +#include <linux/ioasid.h>
>  
>  #include <asm/cacheflush.h>
>  #include <asm/iommu.h>
> @@ -549,6 +550,7 @@ struct intel_iommu {
>  #ifdef CONFIG_INTEL_IOMMU_SVM
>  	struct page_req_dsc *prq;
>  	unsigned char prq_name[16];    /* Name for PRQ interrupt */
> +	struct ioasid_allocator pasid_allocator; /* Custom allocator for PASIDs */
>  #endif
>  	struct q_inval  *qi;            /* Queued invalidation info */
>  	u32 *iommu_state; /* Store iommu states between suspend and resume.*/
> 

Thanks

Eric