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From: "hch@lst.de" <hch@lst.de>
To: Michael Kelley <mikelley@microsoft.com>
Cc: "hch@lst.de" <hch@lst.de>, Tianyu Lan <ltykernel@gmail.com>,
	KY Srinivasan <kys@microsoft.com>,
	Haiyang Zhang <haiyangz@microsoft.com>,
	Stephen Hemminger <sthemmin@microsoft.com>,
	"wei.liu@kernel.org" <wei.liu@kernel.org>,
	Dexuan Cui <decui@microsoft.com>,
	"tglx@linutronix.de" <tglx@linutronix.de>,
	"mingo@redhat.com" <mingo@redhat.com>,
	"bp@alien8.de" <bp@alien8.de>, "x86@kernel.org" <x86@kernel.org>,
	"hpa@zytor.com" <hpa@zytor.com>,
	"dave.hansen@linux.intel.com" <dave.hansen@linux.intel.com>,
	"luto@kernel.org" <luto@kernel.org>,
	"peterz@infradead.org" <peterz@infradead.org>,
	"konrad.wilk@oracle.com" <konrad.wilk@oracle.com>,
	"boris.ostrovsky@oracle.com" <boris.ostrovsky@oracle.com>,
	"jgross@suse.com" <jgross@suse.com>,
	"sstabellini@kernel.org" <sstabellini@kernel.org>,
	"joro@8bytes.org" <joro@8bytes.org>,
	"will@kernel.org" <will@kernel.org>,
	"davem@davemloft.net" <davem@davemloft.net>,
	"kuba@kernel.org" <kuba@kernel.org>,
	"jejb@linux.ibm.com" <jejb@linux.ibm.com>,
	"martin.petersen@oracle.com" <martin.petersen@oracle.com>,
	"arnd@arndb.de" <arnd@arndb.de>,
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	"robin.murphy@arm.com" <robin.murphy@arm.com>,
	"thomas.lendacky@amd.com" <thomas.lendacky@amd.com>,
	"brijesh.singh@amd.com" <brijesh.singh@amd.com>,
	"ardb@kernel.org" <ardb@kernel.org>,
	Tianyu Lan <Tianyu.Lan@microsoft.com>,
	"pgonda@google.com" <pgonda@google.com>,
	"martin.b.radev@gmail.com" <martin.b.radev@gmail.com>,
	"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
	"kirill.shutemov@linux.intel.com"
	<kirill.shutemov@linux.intel.com>,
	"rppt@kernel.org" <rppt@kernel.org>,
	"sfr@canb.auug.org.au" <sfr@canb.auug.org.au>,
	"saravanand@fb.com" <saravanand@fb.com>,
	"krish.sadhukhan@oracle.com" <krish.sadhukhan@oracle.com>,
	"aneesh.kumar@linux.ibm.com" <aneesh.kumar@linux.ibm.com>,
	"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
	"rientjes@google.com" <rientjes@google.com>,
	"hannes@cmpxchg.org" <hannes@cmpxchg.org>,
	"tj@kernel.org" <tj@kernel.org>,
	"iommu@lists.linux-foundation.org"
	<iommu@lists.linux-foundation.org>,
	"linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
	"linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
	"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	vkuznets <vkuznets@redhat.com>,
	"parri.andrea@gmail.com" <parri.andrea@gmail.com>,
	"dave.hansen@intel.com" <dave.hansen@intel.com>,
	linux-rdma@vger.kernel.org, mpi3mr-linuxdrv.pdl@broadcom.com
Subject: min_align_mask Re: [PATCH V3 13/13] HV/Storvsc: Add Isolation VM support for storvsc driver
Date: Tue, 24 Aug 2021 10:49:34 +0200	[thread overview]
Message-ID: <20210824084934.GC29844@lst.de> (raw)
In-Reply-To: <CY4PR21MB1586FEB6F6ADD592C04E541BD7C19@CY4PR21MB1586.namprd21.prod.outlook.com>

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.

WARNING: multiple messages have this Message-ID (diff)
From: "hch@lst.de" <hch@lst.de>
To: Michael Kelley <mikelley@microsoft.com>
Cc: "parri.andrea@gmail.com" <parri.andrea@gmail.com>,
	"linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
	"brijesh.singh@amd.com" <brijesh.singh@amd.com>,
	"peterz@infradead.org" <peterz@infradead.org>,
	"dave.hansen@linux.intel.com" <dave.hansen@linux.intel.com>,
	mpi3mr-linuxdrv.pdl@broadcom.com, vkuznets <vkuznets@redhat.com>,
	"hpa@zytor.com" <hpa@zytor.com>,
	KY Srinivasan <kys@microsoft.com>,
	"will@kernel.org" <will@kernel.org>,
	"tglx@linutronix.de" <tglx@linutronix.de>,
	"linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
	"sfr@canb.auug.org.au" <sfr@canb.auug.org.au>,
	"wei.liu@kernel.org" <wei.liu@kernel.org>,
	"sstabellini@kernel.org" <sstabellini@kernel.org>,
	Stephen Hemminger <sthemmin@microsoft.com>,
	"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
	"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
	linux-rdma@vger.kernel.org,
	"aneesh.kumar@linux.ibm.com" <aneesh.kumar@linux.ibm.com>,
	"x86@kernel.org" <x86@kernel.org>,
	Dexuan Cui <decui@microsoft.com>,
	Tianyu Lan <ltykernel@gmail.com>, "hch@lst.de" <hch@lst.de>,
	"mingo@redhat.com" <mingo@redhat.com>,
	"pgonda@google.com" <pgonda@google.com>,
	"rientjes@google.com" <rientjes@google.com>,
	"kuba@kernel.org" <kuba@kernel.org>,
	"jejb@linux.ibm.com" <jejb@linux.ibm.com>,
	"martin.b.radev@gmail.com" <martin.b.radev@gmail.com>,
	"thomas.lendacky@amd.com" <thomas.lendacky@amd.com>,
	Tianyu Lan <Tianyu.Lan@microsoft.com>,
	"arnd@arndb.de" <arnd@arndb.de>,
	"konrad.wilk@oracle.com" <konrad.wilk@oracle.com>,
	Haiyang Zhang <haiyangz@microsoft.com>,
	"bp@alien8.de" <bp@alien8.de>,
	"luto@kernel.org" <luto@kernel.org>,
	"krish.sadhukhan@oracle.com" <krish.sadhukhan@oracle.com>,
	"boris.ostrovsky@oracle.com" <boris.ostrovsky@oracle.com>,
	"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
	"jgross@suse.com" <jgross@suse.com>,
	"martin.petersen@oracle.com" <martin.petersen@oracle.com>,
	"saravanand@fb.com" <saravanand@fb.com>,
	"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	"dave.hansen@intel.com" <dave.hansen@intel.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"iommu@lists.linux-foundation.org"
	<iommu@lists.linux-foundation.org>,
	"rppt@kernel.org" <rppt@kernel.org>,
	"hannes@cmpxchg.org" <hannes@cmpxchg.org>,
	"tj@kernel.org" <tj@kernel.org>,
	"ardb@kernel.org" <ardb@kernel.org>,
	"robin.murphy@arm.com" <robin.murphy@arm.com>,
	"davem@davemloft.net" <davem@davemloft.net>,
	"kirill.shutemov@linux.intel.com"
	<kirill.shutemov@linux.intel.com>
Subject: min_align_mask Re: [PATCH V3 13/13] HV/Storvsc: Add Isolation VM support for storvsc driver
Date: Tue, 24 Aug 2021 10:49:34 +0200	[thread overview]
Message-ID: <20210824084934.GC29844@lst.de> (raw)
In-Reply-To: <CY4PR21MB1586FEB6F6ADD592C04E541BD7C19@CY4PR21MB1586.namprd21.prod.outlook.com>

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.
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

  reply	other threads:[~2021-08-24  8:49 UTC|newest]

Thread overview: 128+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-09 17:56 [PATCH V3 00/13] x86/Hyper-V: Add Hyper-V Isolation VM support Tianyu Lan
2021-08-09 17:56 ` Tianyu Lan
2021-08-09 17:56 ` [PATCH V3 01/13] x86/HV: Initialize GHCB page in Isolation VM Tianyu Lan
2021-08-09 17:56   ` Tianyu Lan
2021-08-10 10:56   ` Wei Liu
2021-08-10 10:56     ` Wei Liu
2021-08-10 12:17     ` Tianyu Lan
2021-08-10 12:17       ` Tianyu Lan
2021-08-12 19:14   ` Michael Kelley
2021-08-12 19:14     ` Michael Kelley via iommu
2021-08-13 15:46     ` Tianyu Lan
2021-08-13 15:46       ` Tianyu Lan
2021-08-09 17:56 ` [PATCH V3 02/13] x86/HV: Initialize shared memory boundary in the " Tianyu Lan
2021-08-09 17:56   ` Tianyu Lan
2021-08-12 19:18   ` Michael Kelley
2021-08-12 19:18     ` Michael Kelley via iommu
2021-08-14 13:32     ` Tianyu Lan
2021-08-14 13:32       ` Tianyu Lan
2021-08-09 17:56 ` [PATCH V3 03/13] x86/HV: Add new hvcall guest address host visibility support Tianyu Lan
2021-08-09 17:56   ` Tianyu Lan
2021-08-09 22:12   ` Dave Hansen
2021-08-09 22:12     ` Dave Hansen
2021-08-10 13:09     ` Tianyu Lan
2021-08-10 13:09       ` Tianyu Lan
2021-08-10 11:03   ` Wei Liu
2021-08-10 11:03     ` Wei Liu
2021-08-10 12:25     ` Tianyu Lan
2021-08-10 12:25       ` Tianyu Lan
2021-08-12 19:36   ` Michael Kelley
2021-08-12 19:36     ` Michael Kelley via iommu
2021-08-12 21:10   ` Michael Kelley
2021-08-12 21:10     ` Michael Kelley via iommu
2021-08-09 17:56 ` [PATCH V3 04/13] HV: Mark vmbus ring buffer visible to host in Isolation VM Tianyu Lan
2021-08-09 17:56   ` Tianyu Lan
2021-08-12 22:20   ` Michael Kelley
2021-08-12 22:20     ` Michael Kelley via iommu
2021-08-15 15:21     ` Tianyu Lan
2021-08-15 15:21       ` Tianyu Lan
2021-08-09 17:56 ` [PATCH V3 05/13] HV: Add Write/Read MSR registers via ghcb page Tianyu Lan
2021-08-09 17:56   ` Tianyu Lan
2021-08-13 19:31   ` Michael Kelley
2021-08-13 19:31     ` Michael Kelley via iommu
2021-08-13 20:26     ` Michael Kelley
2021-08-13 20:26       ` Michael Kelley via iommu
2021-08-24  8:45   ` Christoph Hellwig
2021-08-24  8:45     ` Christoph Hellwig
2021-08-09 17:56 ` [PATCH V3 06/13] HV: Add ghcb hvcall support for SNP VM Tianyu Lan
2021-08-09 17:56   ` Tianyu Lan
2021-08-13 20:42   ` Michael Kelley
2021-08-13 20:42     ` Michael Kelley via iommu
2021-08-09 17:56 ` [PATCH V3 07/13] HV/Vmbus: Add SNP support for VMbus channel initiate message Tianyu Lan
2021-08-09 17:56   ` Tianyu Lan
2021-08-13 21:28   ` Michael Kelley
2021-08-13 21:28     ` Michael Kelley via iommu
2021-08-09 17:56 ` [PATCH V3 08/13] HV/Vmbus: Initialize VMbus ring buffer for Isolation VM Tianyu Lan
2021-08-09 17:56   ` Tianyu Lan
2021-08-16 17:28   ` Michael Kelley
2021-08-16 17:28     ` Michael Kelley via iommu
2021-08-17 15:36     ` Tianyu Lan
2021-08-17 15:36       ` Tianyu Lan
2021-08-09 17:56 ` [PATCH V3 09/13] DMA: Add dma_map_decrypted/dma_unmap_encrypted() function Tianyu Lan
2021-08-09 17:56   ` Tianyu Lan
2021-08-12 12:26   ` Christoph Hellwig
2021-08-12 12:26     ` Christoph Hellwig
2021-08-12 15:38     ` Tianyu Lan
2021-08-12 15:38       ` Tianyu Lan
2021-08-09 17:56 ` [PATCH V3 10/13] x86/Swiotlb: Add Swiotlb bounce buffer remap function for HV IVM Tianyu Lan
2021-08-09 17:56   ` Tianyu Lan
2021-08-12 12:27   ` Christoph Hellwig
2021-08-12 12:27     ` Christoph Hellwig
2021-08-13 17:58     ` Tianyu Lan
2021-08-13 17:58       ` Tianyu Lan
2021-08-16 14:50       ` Tianyu Lan
2021-08-16 14:50         ` Tianyu Lan
2021-08-19  8:49         ` Christoph Hellwig
2021-08-19  8:49           ` Christoph Hellwig
2021-08-19  9:59           ` Tianyu Lan
2021-08-19  9:59             ` Tianyu Lan
2021-08-19 10:02             ` Christoph Hellwig
2021-08-19 10:02               ` Christoph Hellwig
2021-08-19 10:03               ` Tianyu Lan
2021-08-19 10:03                 ` Tianyu Lan
2021-08-09 17:56 ` [PATCH V3 11/13] HV/IOMMU: Enable swiotlb bounce buffer for Isolation VM Tianyu Lan
2021-08-09 17:56   ` Tianyu Lan
2021-08-19 18:11   ` Michael Kelley
2021-08-19 18:11     ` Michael Kelley via iommu
2021-08-20  4:13     ` hch
2021-08-20  4:13       ` hch
2021-08-20  9:32     ` Tianyu Lan
2021-08-20  9:32       ` Tianyu Lan
2021-08-09 17:56 ` [PATCH V3 12/13] HV/Netvsc: Add Isolation VM support for netvsc driver Tianyu Lan
2021-08-09 17:56   ` Tianyu Lan
2021-08-19 18:14   ` Michael Kelley
2021-08-19 18:14     ` Michael Kelley via iommu
2021-08-20  4:21     ` hch
2021-08-20  4:21       ` hch
2021-08-20 13:11       ` Tianyu Lan
2021-08-20 13:11         ` Tianyu Lan
2021-08-20 13:30       ` Tom Lendacky
2021-08-20 13:30         ` Tom Lendacky via iommu
2021-08-20 18:20     ` Tianyu Lan
2021-08-20 18:20       ` Tianyu Lan
2021-08-09 17:56 ` [PATCH V3 13/13] HV/Storvsc: Add Isolation VM support for storvsc driver Tianyu Lan
2021-08-09 17:56   ` Tianyu Lan
2021-08-19 18:17   ` Michael Kelley
2021-08-19 18:17     ` Michael Kelley via iommu
2021-08-20  4:32     ` hch
2021-08-20  4:32       ` hch
2021-08-20 15:40       ` Michael Kelley
2021-08-20 15:40         ` Michael Kelley via iommu
2021-08-24  8:49         ` hch [this message]
2021-08-24  8:49           ` min_align_mask " hch
2021-08-20 16:01       ` Tianyu Lan
2021-08-20 16:01         ` Tianyu Lan
2021-08-20 15:20     ` Tianyu Lan
2021-08-20 15:20       ` Tianyu Lan
2021-08-20 15:37       ` Tianyu Lan
2021-08-20 15:37         ` Tianyu Lan
2021-08-20 16:08       ` Michael Kelley via iommu
2021-08-20 16:08         ` Michael Kelley
2021-08-20 18:04         ` Tianyu Lan
2021-08-20 18:04           ` Tianyu Lan
2021-08-20 19:22           ` Michael Kelley
2021-08-20 19:22             ` Michael Kelley via iommu
2021-08-24  8:46           ` hch
2021-08-24  8:46             ` hch
2021-08-16 14:55 ` [PATCH V3 00/13] x86/Hyper-V: Add Hyper-V Isolation VM support Michael Kelley
2021-08-16 14:55   ` Michael Kelley via iommu

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