From: Christoph Hellwig <hch@infradead.org>
To: Pankaj Gupta <pagupta@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>,
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 01:02:36 -0700 [thread overview]
Message-ID: <20171017080236.GA27649@infradead.org> (raw)
In-Reply-To: <1441791227.21027037.1508226056893.JavaMail.zimbra@redhat.com>
On Tue, Oct 17, 2017 at 03:40:56AM -0400, Pankaj Gupta wrote:
> 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.
At this point I'm caring about the Linux-internal interface, and
for that it should be integrated into the nvdimm subsystem and not
a block driver. How the host <-> guest interface looks is a different
idea.
>
> 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.
Well, if you want to support XFS+DAX better don't make it a block
devices, because I'll post patches soon to stop using the block device
entirely for the DAX case.
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next prev parent reply other threads:[~2017-10-17 8:02 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 ` [Qemu-devel] " Pankaj Gupta
2017-10-17 8:02 ` Christoph Hellwig [this message]
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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