Re: [PATCH 00/18] CXL RAM and the 'Soft Reserved' => 'System RAM' default

[Gregory Price <gregory.price@memverge.com>]

On Tue, Feb 14, 2023 at 10:39:42AM -0800, Dan Williams wrote:
> Gregory Price wrote:
> > On Sun, Feb 05, 2023 at 05:02:29PM -0800, Dan Williams wrote:
> > > Summary:
> > > --------
> > > 
> > > CXL RAM support allows for the dynamic provisioning of new CXL RAM
> > > regions, and more routinely, assembling a region from an existing
> > > configuration established by platform-firmware. The latter is motivated
> > > by CXL memory RAS (Reliability, Availability and Serviceability)
> > > support, that requires associating device events with System Physical
> > > Address ranges and vice versa.
> > > 
> > 
> > Ok, I simplified down my tests and reverted a bunch of stuff, figured i
> > should report this before I dive further in.
> > 
> > Earlier i was carrying the DOE patches and others, I've dropped most of
> > that to make sure i could replicate on the base kernel and qemu images
> > 
> > QEMU branch: 
> > https://gitlab.com/jic23/qemu/-/tree/cxl-2023-01-26
> > this is a little out of date at this point i think? but it shouldn't
> > matter, the results are the same regardless of what else i pull in.
> > 
> > Kernel branch:
> > https://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git/log/?h=for-6.3/cxl-ram-region
> 
> Note that I acted on this feedback from Greg to break out a fix and
> merge it for v6.2-final
> 
> http://lore.kernel.org/r/Y+CSOeHVLKudN0A6@kroah.com
> 
> ...i.e. you are missing at least the passthrough decoder fix, but that
> would show up as a region creation failure not a QEMU crash.
> 
> So I would move to testing cxl/next.
> 

I just noticed this, already spinning a new kernel.  Will report back

> Not ruling out the driver yet, but Fan's tests with hardware has me
> leaning more towards QEMU.

Same, not much has changed and I haven't tested with hardware yet. Was
planning to install it on our local boxes sometime later this week.

Was just so close to setting up a virtual memory pool in the lab, was
getting antsy :]