Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1498128

Re: [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support for Xen

From Haozhong Zhang <haozhong.zhang@intel.com>
Newsgroups linux.kernel
Subject Re: [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support for Xen
Date 2016-10-10 08:40 +0200
Message-ID <sqCpH-6ic-9@gated-at.bofh.it> (permalink)
References <sqwNj-2FC-3@gated-at.bofh.it> <sqzLb-4wh-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

Show all headers | View raw

On 10/09/16 20:45, Dan Williams wrote:
> On Sun, Oct 9, 2016 at 5:35 PM, Haozhong Zhang <haozhong.zhang@intel.com> wrote:
> > Overview
> > ========
> > This RFC kernel patch series along with corresponding patch series of
> > Xen, QEMU and ndctl implements Xen vNVDIMM, which can map the host
> > NVDIMM devices to Xen HVM domU as vNVDIMM devices.
> >
> > Xen hypervisor does not include an NVDIMM driver, so it needs the
> > assistance from the driver in Dom0 Linux kernel to manage NVDIMM
> > devices. We currently only supports NVDIMM devices in pmem mode.
> >
> > Design and Implementation
> > =========================
> > The complete design can be found at
> >   https://lists.xenproject.org/archives/html/xen-devel/2016-07/msg01921.html.
> 
> The KVM enabling for persistent memory does not need this support from
> the kernel, and as far as I can see neither does Xen. If the
> hypervisor needs to reserve some space it can simply trim the amount
> that it hands to the guest.
>

Xen does not have the NVDIMM driver, so it cannot operate on NVDIMM
devices by itself. Instead it relies on the driver in Dom0 Linux to
probe NVDIMM and make the reservation.

> The usage of fiemap and the sysfs resource for the pmem device, as
> mentioned in the design document, does not seem to comprehend that
> file block allocations may be discontiguous and may change over time
> depending on the file.

True. I may need to find a way to notify Xen of the underlying
changes, so that Xen can then adjust the address mapping.

Thanks,
Haozhong

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support for Xen Haozhong Zhang <haozhong.zhang@intel.com> - 2016-10-10 02:40 +0200
  Re: [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support for Xen Dan Williams <dan.j.williams@intel.com> - 2016-10-10 05:50 +0200
    Re: [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support for Xen Haozhong Zhang <haozhong.zhang@intel.com> - 2016-10-10 08:40 +0200
      Re: [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support for Xen Dan Williams <dan.j.williams@intel.com> - 2016-10-10 18:30 +0200
        Re: [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support for Xen Haozhong Zhang <haozhong.zhang@intel.com> - 2016-10-11 09:20 +0200
  Re: [Xen-devel] [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support for  Xen Andrew Cooper <andrew.cooper3@citrix.com> - 2016-10-10 18:50 +0200
    Re: [Xen-devel] [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support for  Xen Haozhong Zhang <haozhong.zhang@intel.com> - 2016-10-11 08:00 +0200
      Re: [Xen-devel] [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support for  Xen Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> - 2016-10-11 20:50 +0200
      Re: [Xen-devel] [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support for  Xen Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> - 2016-10-11 21:00 +0200
      Re: [Xen-devel] [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support for  Xen Andrew Cooper <andrew.cooper3@citrix.com> - 2016-10-11 21:00 +0200
    Re: [Xen-devel] [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support  for Xen "Jan Beulich" <jbeulich@suse.com> - 2016-10-11 15:10 +0200
      Re: [Xen-devel] [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support for Xen Dan Williams <dan.j.williams@intel.com> - 2016-10-11 18:00 +0200
        Re: [Xen-devel] [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support for  Xen Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> - 2016-10-11 19:00 +0200
          Re: [Xen-devel] [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support for Xen Dan Williams <dan.j.williams@intel.com> - 2016-10-11 20:00 +0200
            Re: [Xen-devel] [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support for  Xen Andrew Cooper <andrew.cooper3@citrix.com> - 2016-10-11 20:30 +0200
              Re: [Xen-devel] [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support for  Xen Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> - 2016-10-11 20:50 +0200
                Re: [Xen-devel] [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support for  Xen Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> - 2016-10-11 21:50 +0200
            Re: [Xen-devel] [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support for  Xen Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> - 2016-10-11 20:40 +0200
              Re: [Xen-devel] [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support for Xen Dan Williams <dan.j.williams@intel.com> - 2016-10-11 21:30 +0200
                Re: [Xen-devel] [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support for  Xen Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> - 2016-10-11 22:00 +0200
                Re: [Xen-devel] [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support for  Xen Andrew Cooper <andrew.cooper3@citrix.com> - 2016-10-11 22:20 +0200
                Re: [Xen-devel] [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support for Xen Dan Williams <dan.j.williams@intel.com> - 2016-10-11 22:20 +0200
                Re: [Xen-devel] [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support for  Xen Haozhong Zhang <haozhong.zhang@intel.com> - 2016-10-12 12:40 +0200
                Re: [Xen-devel] [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support  for Xen "Jan Beulich" <JBeulich@suse.com> - 2016-10-12 13:40 +0200
                Re: [Xen-devel] [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support for  Xen Haozhong Zhang <haozhong.zhang@intel.com> - 2016-10-12 17:10 +0200
                Re: [Xen-devel] [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support  for Xen "Jan Beulich" <JBeulich@suse.com> - 2016-10-12 17:40 +0200
                Re: [Xen-devel] [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support for Xen Dan Williams <dan.j.williams@intel.com> - 2016-10-12 17:50 +0200
                Re: [Xen-devel] [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support  for Xen "Jan Beulich" <JBeulich@suse.com> - 2016-10-12 18:30 +0200
                Re: [Xen-devel] [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support for Xen Dan Williams <dan.j.williams@intel.com> - 2016-10-12 18:30 +0200
        Re: [Xen-devel] [RFC KERNEL PATCH 0/2] Add Dom0 NVDIMM support  for Xen "Jan Beulich" <JBeulich@suse.com> - 2016-10-12 09:30 +0200

csiph-web