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Re: [Qemu-devel] [RFC 2/2] KVM: add virtio-pmem driver
From: |
Christoph Hellwig |
Subject: |
Re: [Qemu-devel] [RFC 2/2] KVM: add virtio-pmem driver |
Date: |
Tue, 17 Oct 2017 01:02:36 -0700 |
User-agent: |
Mutt/1.8.3 (2017-05-23) |
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.
- Re: [Qemu-devel] [RFC 2/2] KVM: add virtio-pmem driver, (continued)
Re: [Qemu-devel] [RFC 2/2] KVM: add virtio-pmem driver, Stefan Hajnoczi, 2017/10/13
Re: [Qemu-devel] [RFC 2/2] KVM: add virtio-pmem driver, Dan Williams, 2017/10/13
Re: [Qemu-devel] [RFC 2/2] KVM: add virtio-pmem driver, Christoph Hellwig, 2017/10/17
- Re: [Qemu-devel] [RFC 2/2] KVM: add virtio-pmem driver, Pankaj Gupta, 2017/10/17
- Re: [Qemu-devel] [RFC 2/2] KVM: add virtio-pmem driver,
Christoph Hellwig <=
- Re: [Qemu-devel] [RFC 2/2] KVM: add virtio-pmem driver, Pankaj Gupta, 2017/10/17
- Re: [Qemu-devel] [RFC 2/2] KVM: add virtio-pmem driver, Stefan Hajnoczi, 2017/10/18
- Re: [Qemu-devel] [RFC 2/2] KVM: add virtio-pmem driver, Dan Williams, 2017/10/18
- Re: [Qemu-devel] [RFC 2/2] KVM: add virtio-pmem driver, Stefan Hajnoczi, 2017/10/19
- Re: [Qemu-devel] [RFC 2/2] KVM: add virtio-pmem driver, Christoph Hellwig, 2017/10/19
- Re: [Qemu-devel] [RFC 2/2] KVM: add virtio-pmem driver, Dan Williams, 2017/10/19
- Re: [Qemu-devel] [RFC 2/2] KVM: add virtio-pmem driver, Christoph Hellwig, 2017/10/20
- Re: [Qemu-devel] [RFC 2/2] KVM: add virtio-pmem driver, Dan Williams, 2017/10/20
- Re: [Qemu-devel] [RFC 2/2] KVM: add virtio-pmem driver, Christoph Hellwig, 2017/10/20
- Re: [Qemu-devel] [RFC 2/2] KVM: add virtio-pmem driver, Dan Williams, 2017/10/20