linux-kernel - RE: [PATCH v7 9/9] iommu/vt-d: Add iotlb flush for nested domain

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Date: Fri, 22 Dec 2023 06:57:58 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: "Liu, Yi L" <yi.l.liu@...el.com>, "joro@...tes.org" <joro@...tes.org>,
	"alex.williamson@...hat.com" <alex.williamson@...hat.com>, "jgg@...dia.com"
	<jgg@...dia.com>, "robin.murphy@....com" <robin.murphy@....com>,
	"baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>
CC: "cohuck@...hat.com" <cohuck@...hat.com>, "eric.auger@...hat.com"
	<eric.auger@...hat.com>, "nicolinc@...dia.com" <nicolinc@...dia.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>, "mjrosato@...ux.ibm.com"
	<mjrosato@...ux.ibm.com>, "chao.p.peng@...ux.intel.com"
	<chao.p.peng@...ux.intel.com>, "yi.y.sun@...ux.intel.com"
	<yi.y.sun@...ux.intel.com>, "peterx@...hat.com" <peterx@...hat.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"shameerali.kolothum.thodi@...wei.com"
	<shameerali.kolothum.thodi@...wei.com>, "lulu@...hat.com" <lulu@...hat.com>,
	"suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
	"iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>, "Duan,
 Zhenzhong" <zhenzhong.duan@...el.com>, "joao.m.martins@...cle.com"
	<joao.m.martins@...cle.com>, "Zeng, Xin" <xin.zeng@...el.com>, "Zhao, Yan Y"
	<yan.y.zhao@...el.com>, "j.granados@...sung.com" <j.granados@...sung.com>
Subject: RE: [PATCH v7 9/9] iommu/vt-d: Add iotlb flush for nested domain

> From: Liu, Yi L <yi.l.liu@...el.com>
> Sent: Thursday, December 21, 2023 11:40 PM
> 
> +
> +static void intel_nested_flush_cache(struct dmar_domain *domain, u64
> addr,
> +				     unsigned long npages, u32 *error)
> +{
> +	struct iommu_domain_info *info;
> +	unsigned long i;
> +	unsigned mask;
> +	u32 fault = 0;
> +
> +	if (npages == U64_MAX)
> +		mask = 64 - VTD_PAGE_SHIFT;
> +	else
> +		mask = ilog2(__roundup_pow_of_two(npages));
> +
> +	xa_for_each(&domain->iommu_array, i, info) {
> +		nested_flush_pasid_iotlb(info->iommu, domain, addr,
> npages, 0);

so IOMMU_VTD_INV_FLAGS_LEAF is defined but ignored?

> +
> +		if (domain->has_iotlb_device)
> +			continue;
> +
> +		nested_flush_dev_iotlb(domain, addr, mask, &fault);
> +		if (fault & (DMA_FSTS_ITE | DMA_FSTS_ICE))
> +			break;

here you may add a note that we don't plan to forward invalidation 
queue error (i.e. IQE) to the caller as it's caused only by driver
internal bug.

> +
> +		if (!IS_ALIGNED(inv_entry.addr, VTD_PAGE_SIZE) ||
> +		    ((inv_entry.npages == U64_MAX) && inv_entry.addr)) {
> +			ret = -EINVAL;
> +			break;
> +		}
> +

why is [non-zero-addr, U64_MAX] an error? Is it explicitly stated to
be not supported by underlying helpers?