From: Jason Gunthorpe <jgg@nvidia.com>
To: Nicolin Chen <nicolinc@nvidia.com>
Cc: Robin Murphy <robin.murphy@arm.com>,
kevin.tian@intel.com, yi.l.liu@intel.com, eric.auger@redhat.com,
baolu.lu@linux.intel.com, shameerali.kolothum.thodi@huawei.com,
jean-philippe@linaro.org, iommu@lists.linux.dev
Subject: Re: Cache Invalidation Solution for Nested IOMMU
Date: Tue, 4 Apr 2023 13:20:01 -0300 [thread overview]
Message-ID: <ZCxOMSvR+6rYbIfy@nvidia.com> (raw)
In-Reply-To: <ZCtpAYn76u499p6G@Asurada-Nvidia>
On Mon, Apr 03, 2023 at 05:02:09PM -0700, Nicolin Chen wrote:
> My preference is to have a mmap'd page, so the interface can
> be reused later by VCMDQ too. Performance-wise, it should be
> good enough, since it does batching, IMHO.
You can't reuse mmaping the queue page with vcmdq, so it doesn't seem
meaningful to me.
There should be no mmap on the SW path. If you need a half step
between an ioctl as a batch and a full vhost-like queue scheme then
using iouring with pre-registered memory would be appropriate.
I feel like this is a topic Shameerali should share some insight with
since the Huawei implementation will rely on this SW path.
Jason
next prev parent reply other threads:[~2023-04-04 16:20 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-03 0:33 Cache Invalidation Solution for Nested IOMMU Nicolin Chen
2023-04-03 7:26 ` Liu, Yi L
2023-04-03 8:39 ` Tian, Kevin
2023-04-03 15:24 ` Nicolin Chen
2023-04-04 2:42 ` Tian, Kevin
2023-04-04 3:12 ` Nicolin Chen
2023-04-03 12:23 ` Jason Gunthorpe
2023-04-03 8:00 ` Tian, Kevin
2023-04-03 14:29 ` Nicolin Chen
2023-04-04 2:15 ` Tian, Kevin
2023-04-04 2:47 ` Nicolin Chen
2023-04-03 14:08 ` Jason Gunthorpe
2023-04-03 14:51 ` Nicolin Chen
2023-04-03 19:15 ` Robin Murphy
2023-04-04 0:02 ` Nicolin Chen
2023-04-04 16:20 ` Jason Gunthorpe [this message]
2023-04-04 16:50 ` Shameerali Kolothum Thodi
2023-04-05 11:57 ` Jason Gunthorpe
2023-04-06 6:23 ` Zhangfei Gao
2023-04-06 6:39 ` Nicolin Chen
2023-04-06 11:40 ` Jason Gunthorpe
2023-04-10 1:08 ` Nicolin Chen
2023-04-11 9:07 ` Jean-Philippe Brucker
2023-04-11 11:57 ` Jason Gunthorpe
2023-04-11 18:39 ` Nicolin Chen
2023-04-11 18:41 ` Jason Gunthorpe
2023-04-11 19:02 ` Nicolin Chen
2023-04-11 18:43 ` Nicolin Chen
2023-04-12 2:47 ` Zhangfei Gao
2023-04-12 5:47 ` Nicolin Chen
2023-05-03 15:14 ` Shameerali Kolothum Thodi
2023-05-03 23:44 ` Nicolin Chen
2023-04-05 5:45 ` Nicolin Chen
2023-04-05 11:37 ` Jason Gunthorpe
2023-04-05 15:34 ` Nicolin Chen
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