linux-kernel - Re: [PATCH v2] drivers/virt/vSMP: new driver

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Message-ID: <YwdhF6r0egBc3w1m@kroah.com>
Date:   Thu, 25 Aug 2022 13:46:31 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     "Czerwacki, Eial" <eial.czerwacki@....com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Arsh, Leonid" <leonid.arsh@....com>,
        "Twaig, Oren" <oren.twaig@....com>,
        SAP vSMP Linux Maintainer <linux.vsmp@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Andra Paraschiv <andraprs@...zon.com>,
        Borislav Petkov <bp@...e.de>,
        Brijesh Singh <brijesh.singh@....com>,
        Eric Biggers <ebiggers@...gle.com>, Fei Li <fei1.li@...el.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Jens Axboe <axboe@...nel.dk>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Subject: Re: [PATCH v2] drivers/virt/vSMP: new driver

On Thu, Aug 25, 2022 at 10:41:28AM +0000, Czerwacki, Eial wrote:
> >On Thu, Aug 25, 2022 at 10:16:59AM +0000, Czerwacki, Eial wrote:
> >> >> >And why is your version file a binary file?  It should just be a small
> >> >> >text string, right?
> >> >> not so small, it can reach up to 512kb.
> >> >
> >> >That was not obvious at all.  Please document this.
> >> where should the document be?
> >> in the code as a comment or in another file?
> >
> >In the Documentation/ABI/ file that describes this file.
> ok, will place it there
> 
> >
> >> >And how in the world is a "version" that big?  What exactly does this
> >> >contain?
> >> it 's size depends on the number of resources it uses.
> >> here is an example:
> >> :~> cat /sys/hypervisor/vsmp/version  
> >> SAP vSMP Foundation: 10.6.2862.0 (Aug 22 2022 15:21:02)
> >> System configuration:
> >>    Boards:      2
> >>       1 x Proc. + I/O + Memory
> >>       1 x NVM devices (Amazon.com Amazon EC2 NVMe Instance Storage)
> >>    Processors:  1, Cores: 2, Threads: 4
> >>        Intel(R) Xeon(R) Platinum 8124M CPU @ 3.00GHz Stepping 04
> >>    Memory (MB): 30976 (of 103192), Cache: 7527, Private: 64689
> >>       1 x  6400MB    [ 7825/ 321/ 1104]      
> >>       1 x 24576MB    [95367/7206/63585]       00:1f.0#1
> >>    Boot device: [HDD] NVMe: Amazon Elastic Block Store        
> >> Supported until: Aug 22 2024
> >
> >That is crazy, and is not a version.  It's a "configuration".
> it is called version for history reasons...

There is no "history" here, you can create whatever sane interface you
want right now, there is no backwards compatible issues involved at all.

> >See above, make it text only for the version.  If you want to export
> >other things, be explicit and make them "one value per sysfs file" or
> >use debugfs for debugging things that no one relies on.
> so you suggest braking the summery into files, e.g. one for cpus, one for ram and etcetera?

Again, who uses this information and what is it used for?

thanks,

greg k-h