> -----原始邮件-----
> 发件人: "Jonathan Cameron" <jonathan.came...@huawei.com>
> 发送时间:2025-03-13 02:10:35 (星期四)
> 收件人: "Yuquan Wang" <wangyuquan1...@phytium.com.cn>
> 抄送: qemu-devel@nongnu.org, linux-...@vger.kernel.org
> 主题: Re: [PATCH] docs/cxl: Add serial number for persistent-memdev
>
> On Wed, 5 Mar 2025 18:35:40 +0800
> Yuquan Wang <wangyuquan1...@phytium.com.cn> wrote:
>
> > >
> > > On Tue, 4 Mar 2025 14:22:48 +0800
> > > Yuquan Wang <wangyuquan1...@phytium.com.cn> wrote:
> > >
> > > > >
> > > > > On Thu, Feb 20, 2025 at 04:12:13PM +0000, Jonathan Cameron wrote:
> > > > > > On Mon, 17 Feb 2025 19:20:39 +0800
> > > > > > Yuquan Wang <wangyuquan1...@phytium.com.cn> wrote:
> > > > > >
> > > > > > > Add serial number parameter in the cxl persistent examples.
> > > > > > >
> > > > > > > Signed-off-by: Yuquan Wang <wangyuquan1...@phytium.com.cn>
> > > > > > Looks good. I've queued it up on my gitlab staging tree, but
> > > > > > Michael if you want to pick this one directly that's fine as well.
> > > > > >
> > > > >
> > > > > See no reason to, I was not even CC'd.
> > > >
> > > > Hi, Michael
> > > >
> > > > I'm sorry, this is my fault. I used "get_maintainer.pl" to check this
> > > > patch's maintainers but it shows "No maintainers found, printing recent
> > > > contributors".
> > > >
> > > I usually stage up multiple series together and send on to Michael.
> > > So it was be being lazy for a minor change rather than anything much
> > > that you did wrong.
> > >
> > > If I get time I'll post a series with this a few other patches
> > > later today.
> > >
> > > Jonathan
> > >
> > Thank you!
> >
> > BTW, I found a corner case in CXL numa node creation.
> >
> > Condition:
> > 1) A UMA/NUMA system without SRAT, but with CEDT.CFMWS
> > 2）Enable CONFIG_ACPI_NUMA
> >
> > Results:
> > 1) acpi_numa_init: the fake_pxm will be 0 and send to acpi_parse_cfmws()
> > 2）If dynamically create cxl ram region, the cxl memory would be assigned
> > to node0 rather than a new node
> >
> > Confusions:
> > 1) Is a numa system a requirement for CXL memory usage?
>
> Obviously discussion has gone on elsewhere, but I'd say in general it
> would be a bad idea to not have an SRAT because the moment we add CXL
> it is definitely a NUMA system and we want the Generic Port entry to
> allow us to get perf information.
>
> So I wouldn't mind if we fail CXL init in this case, but maybe
> it is worth papering over things.
>
> Jonathan
>
Hi, Jonathan
Recentlty I managed to do some hot-plug tests on cxl type3 device on QEMU.
I tried use "device add" qemu command in monitor, but it failed. I also used
unbind/bind cxl_pci driver in sysfs, I can see the software flow on device but
no expected actions on cxl root ports linked(like pcie hot-plug interrupt and
so on).
Could we simulate a hot-add flow of type3 device in qemu now? Maybe I used the
wrong method :(
Yuquan
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