linux-kernel - Re: CXL memory device not created correctly

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Date:   Fri, 19 May 2023 16:10:14 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Davidlohr Bueso <dave@...olabs.net>
CC:     LiuLele <liu.lele@...com>, <dave.jiang@...el.com>,
        <alison.schofield@...el.com>, <bhelgaas@...gle.com>,
        <bwidawsk@...nel.org>, <dan.j.williams@...el.com>,
        <helgaas@...nel.org>, <ira.weiny@...el.com>,
        <linux-acpi@...r.kernel.org>, <linux-cxl@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <rostedt@...dmis.org>, <vishal.l.verma@...el.com>
Subject: Re: CXL memory device not created correctly

On Thu, 18 May 2023 18:38:46 -0700
Davidlohr Bueso <dave@...olabs.net> wrote:

> On Fri, 19 May 2023, LiuLele wrote:
> 
> >In my testing CXL device /sys/bus/cxl/devices/mem0  not created, and the get error messages :
> >
> >```
> >cxl_pci 0000:0d:00.0: Failed to get interrupt for event Info log
> >```
> >
> >My test environment is a qemu CXL emulator with qemu v8.0.0, Linux kernel v6.3.0.
> >While with kernel 5.9.13,  /sys/bus/cxl/devices/mem0  can be created.  
> 
> Yes, this can be annoying and would argue the probe should not error out.
> Regardless, the actual qemu support is in Jonathan's tree:
> 
> https://gitlab.com/jic23/qemu/-/commit/a04e6476df363d1f6bc160577b30dda6564d3f67

That just failed to make it into an upstream pull request today due to some
bugs in a the poison list set that came before it :( 

v6 or poison list and events support are both on list now and hopefully will make
this QEMU cycle so be in 8.1

Jonathan


> 
> Thanks,
> Davidlohr