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From: Jeff Moyer <jmoyer@redhat.com>
To: Dan Williams <dan.j.williams@intel.com>
Cc: Pankaj Gupta <pagupta@redhat.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
KVM list <kvm@vger.kernel.org>,
Qemu Developers <qemu-devel@nongnu.org>,
linux-nvdimm <linux-nvdimm@ml01.01.org>,
Linux MM <linux-mm@kvack.org>, Jan Kara <jack@suse.cz>,
Stefan Hajnoczi <stefanha@redhat.com>,
Rik van Riel <riel@surriel.com>,
Haozhong Zhang <haozhong.zhang@intel.com>,
Nitesh Narayan Lal <nilal@redhat.com>,
Kevin Wolf <kwolf@redhat.com>,
Paolo Bonzini <pbonzini@redhat.com>, "Zwisler\,
Ross" <ross.zwisler@intel.com>,
David Hildenbrand <david@redhat.com>,
Xiao Guangrong <xiaoguangrong.eric@gmail.com>,
Christoph Hellwig <hch@infradead.org>,
Marcel Apfelbaum <marcel@redhat.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
niteshnarayanlal@hotmail.com, Igor Mammedov <imammedo@redhat.com>,
lcapitulino@redhat.com
Subject: Re: [RFC v2 1/2] virtio: add pmem driver
Date: Thu, 26 Apr 2018 08:27:41 -0400 [thread overview]
Message-ID: <x49o9i6885e.fsf@segfault.boston.devel.redhat.com> (raw)
In-Reply-To: <CAPcyv4hiowWozV527sQA_e4fdgCYbD6xfG==vepAqu0hxQEQcw@mail.gmail.com> (Dan Williams's message of "Wed, 25 Apr 2018 07:43:52 -0700")
Dan Williams <dan.j.williams@intel.com> writes:
> [ adding Jeff directly since he has also been looking at
> infrastructure to track when MAP_SYNC should be disabled ]
>
> On Wed, Apr 25, 2018 at 7:21 AM, Dan Williams <dan.j.williams@intel.com> wrote:
>> On Wed, Apr 25, 2018 at 4:24 AM, Pankaj Gupta <pagupta@redhat.com> wrote:
>>> This patch adds virtio-pmem driver for KVM
>>> guest.
>>
>> Minor nit, please expand your changelog line wrapping to 72 columns.
>>
>>>
>>> Guest reads the persistent memory range
>>> information from Qemu over VIRTIO and registers
>>> it on nvdimm_bus. It also creates a nd_region
>>> object with the persistent memory range
>>> information so that existing 'nvdimm/pmem'
>>> driver can reserve this into system memory map.
>>> This way 'virtio-pmem' driver uses existing
>>> functionality of pmem driver to register persistent
>>> memory compatible for DAX capable filesystems.
>>
>> We need some additional enabling to disable MAP_SYNC for this
enable to disable... I like it! ;-)
>> configuration. In other words, if fsync() is required then we must
>> disable the MAP_SYNC optimization. I think this should be a struct
>> dax_device property looked up at mmap time in each MAP_SYNC capable
>> ->mmap() file operation implementation.
Ideally, qemu (seabios?) would advertise a platform capabilities
sub-table that doesn't fill in the flush bits.
-Jeff
next prev parent reply other threads:[~2018-04-26 12:27 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-25 11:24 [RFC v2 0/2] kvm "fake DAX" device flushing Pankaj Gupta
2018-04-25 11:24 ` [RFC v2 1/2] virtio: add pmem driver Pankaj Gupta
2018-04-25 14:21 ` Dan Williams
2018-04-25 14:43 ` Dan Williams
2018-04-26 12:27 ` Jeff Moyer [this message]
2018-04-26 17:15 ` [Qemu-devel] " Pankaj Gupta
2018-04-26 17:24 ` Jeff Moyer
2018-04-25 14:52 ` Michael S. Tsirkin
2018-04-25 15:11 ` [Qemu-devel] " Pankaj Gupta
2018-04-26 13:12 ` Stefan Hajnoczi
2018-04-26 15:44 ` Pankaj Gupta
2018-04-27 13:31 ` Stefan Hajnoczi
2018-04-28 10:48 ` Pankaj Gupta
2018-04-25 11:24 ` [RFC v2 2/2] pmem: device flush over VIRTIO Pankaj Gupta
2018-04-25 14:23 ` Dan Williams
2018-04-25 14:47 ` Pankaj Gupta
2018-04-26 13:15 ` Stefan Hajnoczi
2018-04-26 16:40 ` Pankaj Gupta
2018-04-26 16:57 ` Dan Williams
2018-04-26 17:13 ` Pankaj Gupta
2018-04-25 11:24 ` [RFC v2] qemu: Add virtio pmem device Pankaj Gupta
2018-04-25 11:35 ` [Qemu-devel] " no-reply
2018-04-25 11:58 ` Pankaj Gupta
2018-04-25 14:23 ` Eric Blake
2018-04-25 14:51 ` Pankaj Gupta
2018-04-25 11:46 ` no-reply
2018-04-25 14:25 ` Eric Blake
2018-04-25 14:55 ` Pankaj Gupta
2018-04-26 13:24 ` Stefan Hajnoczi
2018-04-26 16:43 ` [Qemu-devel] " Pankaj Gupta
2018-06-01 12:24 ` [Qemu-devel] [RFC v2 0/2] kvm "fake DAX" device flushing Igor Mammedov
2018-06-04 5:56 ` Pankaj Gupta
2018-06-04 9:55 ` David Hildenbrand
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