From: Pankaj Gupta <pagupta@redhat.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: kwolf@redhat.com, haozhong zhang <haozhong.zhang@intel.com>,
jack@suse.cz, xiaoguangrong eric <xiaoguangrong.eric@gmail.com>,
kvm@vger.kernel.org, david@redhat.com, linux-nvdimm@ml01.01.org,
ross zwisler <ross.zwisler@intel.com>,
linux-kernel@vger.kernel.org, qemu-devel@nongnu.org,
linux-mm@kvack.org, stefanha@redhat.com, pbonzini@redhat.com,
dan j williams <dan.j.williams@intel.com>,
nilal@redhat.com
Subject: Re: [Qemu-devel] [RFC 2/2] KVM: add virtio-pmem driver
Date: Tue, 17 Oct 2017 03:40:56 -0400 (EDT) [thread overview]
Message-ID: <1441791227.21027037.1508226056893.JavaMail.zimbra@redhat.com> (raw)
In-Reply-To: <20171017071633.GA9207@infradead.org>
>
> I think this driver is at entirely the wrong level.
>
> If you want to expose pmem to a guest with flushing assist do it
> as pmem, and not a block driver.
Are you saying do it as existing i.e ACPI pmem like interface?
The reason we have created this new driver is exiting pmem driver
does not define proper semantics for guest flushing requests.
Regarding block support of driver, we want to achieve DAX support
to bypass guest page cache. Also, we want to utilize existing DAX
capable file-system interfaces(e.g fsync) from userspace file API's
to trigger the host side flush request.
Below link has details of previous discussion:
https://marc.info/?l=kvm&m=150091133700361&w=2
Thanks,
Pankaj
next prev parent reply other threads:[~2017-10-17 7:40 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-12 15:50 [RFC 0/2] KVM "fake DAX" device flushing Pankaj Gupta
2017-10-12 15:50 ` [RFC 1/2] pmem: Move reusable code to base header files Pankaj Gupta
2017-10-12 20:42 ` Dan Williams
2017-10-12 21:27 ` [Qemu-devel] " Pankaj Gupta
[not found] ` <20171012155027.3277-1-pagupta-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-10-12 15:50 ` [RFC 2/2] KVM: add virtio-pmem driver Pankaj Gupta
2017-10-12 20:51 ` Dan Williams
2017-10-12 21:25 ` Pankaj Gupta
2017-10-12 21:54 ` Dan Williams
[not found] ` <CAPcyv4gkri7t+3Unf0sc9AHMnz-v9G_qV_bJppLjUUNAn7drrQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-10-12 22:18 ` Pankaj Gupta
2017-10-12 22:27 ` Rik van Riel
2017-10-12 22:39 ` Pankaj Gupta
2017-10-12 22:52 ` Pankaj Gupta
2017-10-12 22:59 ` Dan Williams
2017-10-12 23:07 ` Pankaj Gupta
2017-10-13 9:44 ` Stefan Hajnoczi
2017-10-13 10:48 ` Pankaj Gupta
[not found] ` <24301306.20068579.1507891695416.JavaMail.zimbra-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-10-16 14:47 ` Stefan Hajnoczi
2017-10-16 15:58 ` Dan Williams
2017-10-16 17:04 ` Pankaj Gupta
[not found] ` <20171013094431.GA27308-lxVrvc10SDRcolVlb+j0YCZi+YwRKgec@public.gmane.org>
2017-10-13 15:25 ` Dan Williams
[not found] ` <20171012155027.3277-3-pagupta-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-10-17 7:16 ` Christoph Hellwig
2017-10-17 7:40 ` Pankaj Gupta [this message]
2017-10-17 8:02 ` [Qemu-devel] " Christoph Hellwig
2017-10-17 8:30 ` Pankaj Gupta
2017-10-18 13:03 ` Stefan Hajnoczi
2017-10-18 15:51 ` Dan Williams
[not found] ` <CAPcyv4h6aFkyHhh4R4DTznbSCLf9CuBoszk0Q1gB5EKNcp_SeQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-10-19 8:01 ` Stefan Hajnoczi
2017-10-19 8:01 ` Christoph Hellwig
[not found] ` <20171019080149.GB10089-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2017-10-19 18:21 ` Dan Williams
[not found] ` <CAPcyv4j=Cdp68C15HddKaErpve2UGRfSTiL6bHiS=3gQybz9pg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-10-20 8:00 ` Christoph Hellwig
[not found] ` <20171020080049.GA25471-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2017-10-20 15:05 ` Dan Williams
2017-10-20 16:06 ` Christoph Hellwig
2017-10-20 16:11 ` Dan Williams
2017-10-12 15:50 ` [RFC] QEMU: Add virtio pmem device Pankaj Gupta
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