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min_align_mask Re: [PATCH V3 13/13] HV/Storvsc: Add Isolation VM support for storvsc driver
- To: Michael Kelley <mikelley@xxxxxxxxxxxxx>
- From: "hch@xxxxxx" <hch@xxxxxx>
- Date: Tue, 24 Aug 2021 10:49:34 +0200
- Cc: "hch@xxxxxx" <hch@xxxxxx>, Tianyu Lan <ltykernel@xxxxxxxxx>, KY Srinivasan <kys@xxxxxxxxxxxxx>, Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>, Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>, "wei.liu@xxxxxxxxxx" <wei.liu@xxxxxxxxxx>, Dexuan Cui <decui@xxxxxxxxxxxxx>, "tglx@xxxxxxxxxxxxx" <tglx@xxxxxxxxxxxxx>, "mingo@xxxxxxxxxx" <mingo@xxxxxxxxxx>, "bp@xxxxxxxxx" <bp@xxxxxxxxx>, "x86@xxxxxxxxxx" <x86@xxxxxxxxxx>, "hpa@xxxxxxxxx" <hpa@xxxxxxxxx>, "dave.hansen@xxxxxxxxxxxxxxx" <dave.hansen@xxxxxxxxxxxxxxx>, "luto@xxxxxxxxxx" <luto@xxxxxxxxxx>, "peterz@xxxxxxxxxxxxx" <peterz@xxxxxxxxxxxxx>, "konrad.wilk@xxxxxxxxxx" <konrad.wilk@xxxxxxxxxx>, "boris.ostrovsky@xxxxxxxxxx" <boris.ostrovsky@xxxxxxxxxx>, "jgross@xxxxxxxx" <jgross@xxxxxxxx>, "sstabellini@xxxxxxxxxx" <sstabellini@xxxxxxxxxx>, "joro@xxxxxxxxxx" <joro@xxxxxxxxxx>, "will@xxxxxxxxxx" <will@xxxxxxxxxx>, "davem@xxxxxxxxxxxxx" <davem@xxxxxxxxxxxxx>, "kuba@xxxxxxxxxx" <kuba@xxxxxxxxxx>, "jejb@xxxxxxxxxxxxx" <jejb@xxxxxxxxxxxxx>, "martin.petersen@xxxxxxxxxx" <martin.petersen@xxxxxxxxxx>, "arnd@xxxxxxxx" <arnd@xxxxxxxx>, "m.szyprowski@xxxxxxxxxxx" <m.szyprowski@xxxxxxxxxxx>, "robin.murphy@xxxxxxx" <robin.murphy@xxxxxxx>, "thomas.lendacky@xxxxxxx" <thomas.lendacky@xxxxxxx>, "brijesh.singh@xxxxxxx" <brijesh.singh@xxxxxxx>, "ardb@xxxxxxxxxx" <ardb@xxxxxxxxxx>, Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx>, "pgonda@xxxxxxxxxx" <pgonda@xxxxxxxxxx>, "martin.b.radev@xxxxxxxxx" <martin.b.radev@xxxxxxxxx>, "akpm@xxxxxxxxxxxxxxxxxxxx" <akpm@xxxxxxxxxxxxxxxxxxxx>, "kirill.shutemov@xxxxxxxxxxxxxxx" <kirill.shutemov@xxxxxxxxxxxxxxx>, "rppt@xxxxxxxxxx" <rppt@xxxxxxxxxx>, "sfr@xxxxxxxxxxxxxxxx" <sfr@xxxxxxxxxxxxxxxx>, "saravanand@xxxxxx" <saravanand@xxxxxx>, "krish.sadhukhan@xxxxxxxxxx" <krish.sadhukhan@xxxxxxxxxx>, "aneesh.kumar@xxxxxxxxxxxxx" <aneesh.kumar@xxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, "rientjes@xxxxxxxxxx" <rientjes@xxxxxxxxxx>, "hannes@xxxxxxxxxxx" <hannes@xxxxxxxxxxx>, "tj@xxxxxxxxxx" <tj@xxxxxxxxxx>, "iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx" <iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx>, "linux-arch@xxxxxxxxxxxxxxx" <linux-arch@xxxxxxxxxxxxxxx>, "linux-hyperv@xxxxxxxxxxxxxxx" <linux-hyperv@xxxxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "linux-scsi@xxxxxxxxxxxxxxx" <linux-scsi@xxxxxxxxxxxxxxx>, "netdev@xxxxxxxxxxxxxxx" <netdev@xxxxxxxxxxxxxxx>, vkuznets <vkuznets@xxxxxxxxxx>, "parri.andrea@xxxxxxxxx" <parri.andrea@xxxxxxxxx>, "dave.hansen@xxxxxxxxx" <dave.hansen@xxxxxxxxx>, linux-rdma@xxxxxxxxxxxxxxx, mpi3mr-linuxdrv.pdl@xxxxxxxxxxxx
- Delivery-date: Tue, 24 Aug 2021 08:49:43 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Fri, Aug 20, 2021 at 03:40:08PM +0000, Michael Kelley wrote:
> I see that the swiotlb code gets and uses the min_align_mask field. But
> the NVME driver is the only driver that ever sets it, so the value is zero
> in all other cases. Does swiotlb just use PAGE_SIZE in that that case? I
> couldn't tell from a quick glance at the swiotlb code.
The encoding isn't all that common. I only know it for the RDMA memory
registration format, and RDMA in general does not interact very well
with swiotlb (although the in-kernel drivers should work fine, it is
userspace RDMA that is the problem). It seems recently a new driver
using the format (mpi3mr) also showed up. All these should probably set
the min_align_mask.
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