* min_align_mask Re: [PATCH V3 13/13] HV/Storvsc: Add Isolation VM support for storvsc driver
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@ 2021-08-24 8:49 ` hch
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From: hch @ 2021-08-24 8:49 UTC (permalink / raw)
To: Michael Kelley
Cc: hch@lst.de, Tianyu Lan, KY Srinivasan, Haiyang Zhang,
Stephen Hemminger, wei.liu@kernel.org, Dexuan Cui,
tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com,
luto@kernel.org, peterz@infradead.org, konrad.wilk@oracle.com,
boris.ostrovsky@oracle.com, jgross@suse.com,
sstabellini@kernel.org, joro@8bytes.org, will@kernel.org,
davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com,
martin.petersen@oracle.com, arnd@arndb.de,
m.szyprowski@samsung.com, robin.murphy@arm.com,
thomas.lendacky@amd.com, brijesh.singh@amd.com, ardb@kernel.org,
Tianyu Lan, pgonda@google.com, martin.b.radev@gmail.com,
akpm@linux-foundation.org, kirill.shutemov@linux.intel.com,
rppt@kernel.org, sfr@canb.auug.org.au, saravanand@fb.com,
krish.sadhukhan@oracle.com, aneesh.kumar@linux.ibm.com,
xen-devel@lists.xenproject.org, rientjes@google.com,
hannes@cmpxchg.org, tj@kernel.org,
iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org,
linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-scsi@vger.kernel.org, netdev@vger.kernel.org, vkuznets,
parri.andrea@gmail.com, dave.hansen@intel.com, linux-rdma,
mpi3mr-linuxdrv.pdl
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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2021-08-24 8:49 ` min_align_mask Re: [PATCH V3 13/13] HV/Storvsc: Add Isolation VM support for storvsc driver hch
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