From: Bart Van Assche <bvanassche@acm.org>
To: Maxim Levitsky <mlevitsk@redhat.com>, linux-nvme@lists.infradead.org
Cc: Fam Zheng <fam@euphon.net>, Keith Busch <keith.busch@intel.com>,
Sagi Grimberg <sagi@grimberg.me>,
kvm@vger.kernel.org, "David S . Miller" <davem@davemloft.net>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Liang Cunming <cunming.liang@intel.com>,
Wolfram Sang <wsa@the-dreams.de>,
linux-kernel@vger.kernel.org,
Kirti Wankhede <kwankhede@nvidia.com>, Jens Axboe <axboe@fb.com>,
Alex Williamson <alex.williamson@redhat.com>,
John Ferlan <jferlan@redhat.com>,
Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
Paolo Bonzini <pbonzini@redhat.com>,
Liu Changpeng <changpeng.liu@intel.com>,
"Paul E . McKenney" <paulmck@linux.ibm.com>,
Amnon Ilan <ailan@redhat.com>, Christoph Hellwig <hch@lst.de>,
Nicolas Ferre <nicolas.ferre@microchip.com>
Subject: Re: [PATCH 0/9] RFC: NVME VFIO mediated device
Date: Wed, 20 Mar 2019 08:28:06 -0700 [thread overview]
Message-ID: <1553095686.65329.36.camel@acm.org> (raw)
In-Reply-To: <20190319144116.400-1-mlevitsk@redhat.com>
On Tue, 2019-03-19 at 16:41 +0200, Maxim Levitsky wrote:
> * All guest memory is mapped into the physical nvme device
> but not 1:1 as vfio-pci would do this.
> This allows very efficient DMA.
> To support this, patch 2 adds ability for a mdev device to listen on
> guest's memory map events.
> Any such memory is immediately pinned and then DMA mapped.
> (Support for fabric drivers where this is not possible exits too,
> in which case the fabric driver will do its own DMA mapping)
Does this mean that all guest memory is pinned all the time? If so, are you
sure that's acceptable?
Additionally, what is the performance overhead of the IOMMU notifier added
by patch 8/9? How often was that notifier called per second in your tests
and how much time was spent per call in the notifier callbacks?
Thanks,
Bart.
next prev parent reply other threads:[~2019-03-20 15:28 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20190319144116.400-1-mlevitsk@redhat.com>
2019-03-19 14:41 ` [PATCH 1/9] vfio/mdev: add .request callback Maxim Levitsky
2019-03-19 14:41 ` [PATCH 2/9] nvme/core: add some more values from the spec Maxim Levitsky
2019-03-19 14:41 ` [PATCH 3/9] nvme/core: add NVME_CTRL_SUSPENDED controller state Maxim Levitsky
2019-03-19 14:41 ` [PATCH 4/9] nvme/pci: use the NVME_CTRL_SUSPENDED state Maxim Levitsky
2019-03-20 2:54 ` Fam Zheng
2019-03-19 14:41 ` [PATCH 5/9] nvme/pci: add known admin effects to augument admin effects log page Maxim Levitsky
2019-03-19 14:41 ` [PATCH 6/9] nvme/pci: init shadow doorbell after each reset Maxim Levitsky
2019-03-19 14:41 ` [PATCH 7/9] nvme/core: add mdev interfaces Maxim Levitsky
2019-03-20 11:46 ` Stefan Hajnoczi
2019-03-20 12:50 ` Maxim Levitsky
2019-03-19 14:41 ` [PATCH 8/9] nvme/core: add nvme-mdev core driver Maxim Levitsky
2019-03-19 14:41 ` [PATCH 9/9] nvme/pci: implement the mdev external queue allocation interface Maxim Levitsky
2019-03-19 14:58 ` [PATCH 0/9] RFC: NVME VFIO mediated device Maxim Levitsky
2019-03-25 18:52 ` [PATCH 0/9] RFC: NVME VFIO mediated device [BENCHMARKS] Maxim Levitsky
2019-03-26 9:38 ` Stefan Hajnoczi
2019-03-26 9:50 ` Maxim Levitsky
2019-03-19 15:22 ` your mail Keith Busch
2019-03-19 23:49 ` Chaitanya Kulkarni
2019-03-20 16:44 ` Maxim Levitsky
2019-03-20 16:30 ` Maxim Levitsky
2019-03-20 17:03 ` Keith Busch
2019-03-20 17:33 ` Maxim Levitsky
2019-04-08 10:04 ` Maxim Levitsky
2019-03-20 11:03 ` Felipe Franciosi
2019-03-20 19:08 ` Re: Maxim Levitsky
2019-03-21 16:12 ` Re: Stefan Hajnoczi
2019-03-21 16:21 ` Re: Keith Busch
2019-03-21 16:41 ` Re: Felipe Franciosi
2019-03-21 17:04 ` Re: Maxim Levitsky
2019-03-22 7:54 ` Re: Felipe Franciosi
2019-03-22 10:32 ` Re: Maxim Levitsky
2019-03-22 15:30 ` Re: Keith Busch
2019-03-25 15:44 ` Re: Felipe Franciosi
2019-03-20 15:08 ` [PATCH 0/9] RFC: NVME VFIO mediated device Bart Van Assche
2019-03-20 16:48 ` Maxim Levitsky
2019-03-20 15:28 ` Bart Van Assche [this message]
2019-03-20 16:42 ` Maxim Levitsky
2019-03-20 17:03 ` Alex Williamson
2019-03-21 16:13 ` your mail Stefan Hajnoczi
2019-03-21 17:07 ` Maxim Levitsky
2019-03-25 16:46 ` Stefan Hajnoczi
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