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Re: [PATCH] Deprecate pmem=on with non-DAX capable backend file
From: |
Igor Mammedov |
Subject: |
Re: [PATCH] Deprecate pmem=on with non-DAX capable backend file |
Date: |
Mon, 3 May 2021 14:14:04 +0200 |
On Wed, 28 Apr 2021 12:29:30 -0400
Eduardo Habkost <ehabkost@redhat.com> wrote:
> On Tue, Apr 27, 2021 at 04:48:48PM -0400, Eduardo Habkost wrote:
> > On Mon, Jan 11, 2021 at 03:33:32PM -0500, Igor Mammedov wrote:
> > > It is not safe to pretend that emulated NVDIMM supports
> > > persistence while backend actually failed to enable it
> > > and used non-persistent mapping as fall back.
> > > Instead of falling-back, QEMU should be more strict and
> > > error out with clear message that it's not supported.
> > > So if user asks for persistence (pmem=on), they should
> > > store backing file on NVDIMM.
> > >
> > > Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> > > Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> >
> > I'm queueing this for 6.1, after changing "since 6.0" to "since 6.1".
> >
> > Sorry for letting it fall through the cracks.
>
> This caused build failures[1] and I had to apply the following
> fixup.
Thanks!
>
> [1] https://gitlab.com/ehabkost/qemu/-/jobs/1216917482#L3444
>
> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
> ---
> docs/system/deprecated.rst | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/docs/system/deprecated.rst b/docs/system/deprecated.rst
> index cc8d810be1a..c55c4bceb00 100644
> --- a/docs/system/deprecated.rst
> +++ b/docs/system/deprecated.rst
> @@ -257,6 +257,7 @@ is (a) not DAX capable or (b) not on a filesystem that
> support direct mapping
> of persistent memory, is not safe and may lead to data loss or corruption in
> case
> of host crash.
> Options are:
> +
> - modify VM configuration to set ``pmem=off`` to continue using fake
> NVDIMM
> (without persistence guaranties) with backing file on non DAX storage
> - move backing file to NVDIMM storage and keep ``pmem=on``
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