linux-kernel - Re: [PATCH v4 2/9] virt: geniezone: Add GenieZone hypervisor support

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Message-ID: <ea531ba80db67cccb03ea173e714fe868f869e91.camel@mediatek.com>
Date:   Fri, 21 Jul 2023 08:46:19 +0000
From:   Yi-De Wu (吳一德) <Yi-De.Wu@...iatek.com>
To:     "corbet@....net" <corbet@....net>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>,
        "krzysztof.kozlowski@...aro.org" <krzysztof.kozlowski@...aro.org>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        Yingshiuan Pan (潘穎軒) 
        <Yingshiuan.Pan@...iatek.com>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "arnd@...db.de" <arnd@...db.de>,
        Ze-yu Wang (王澤宇) 
        <Ze-yu.Wang@...iatek.com>, "will@...nel.org" <will@...nel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        MY Chuang (莊明躍) <MY.Chuang@...iatek.com>,
        "quic_tsoni@...cinc.com" <quic_tsoni@...cinc.com>,
        "conor.dooley@...rochip.com" <conor.dooley@...rochip.com>,
        PeiLun Suei (隋培倫) 
        <PeiLun.Suei@...iatek.com>,
        Liju-clr Chen (陳麗如) 
        <Liju-clr.Chen@...iatek.com>,
        Jades Shih (施向玨) 
        <jades.shih@...iatek.com>,
        "conor+dt@...nel.org" <conor+dt@...nel.org>,
        "dbrazdil@...gle.com" <dbrazdil@...gle.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        Shawn Hsiao (蕭志祥) 
        <shawn.hsiao@...iatek.com>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        Ivan Tseng (曾志軒) 
        <ivan.tseng@...iatek.com>,
        Chi-shen Yeh (葉奇軒) 
        <Chi-shen.Yeh@...iatek.com>
Subject: Re: [PATCH v4 2/9] virt: geniezone: Add GenieZone hypervisor support

On Fri, 2023-06-09 at 17:22 +0200, Krzysztof Kozlowski wrote:
>  	 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
>  On 09/06/2023 10:52, Yi-De Wu wrote:
> > From: "Yingshiuan Pan" <yingshiuan.pan@...iatek.com>
> > 
> > GenieZone is MediaTek hypervisor solution, and it is running in EL2
> > stand alone as a type-I hypervisor. This patch exports a set of
> ioctl
> > interfaces for userspace VMM (e.g., crosvm) to operate guest VMs
> > lifecycle (creation and destroy) on GenieZone.
> 
> ...
> 
> > +static int gzvm_drv_probe(void)
> > +{
> > +int ret;
> > +
> > +if (gzvm_arch_probe() != 0) {
> > +pr_err("Not found available conduit\n");
> > +return -ENODEV;
> > +}
> > +
> > +ret = misc_register(&gzvm_dev);
> > +if (ret)
> > +return ret;
> > +gzvm_debug_dev = &gzvm_dev;
> > +
> > +return 0;
> > +}
> > +
> > +static int gzvm_drv_remove(void)
> > +{
> > +destroy_all_vm();
> > +misc_deregister(&gzvm_dev);
> > +return 0;
> > +}
> > +
> > +static int gzvm_dev_init(void)
> > +{
> > +return gzvm_drv_probe();
> 
> So for every system and architecture you want to: probe, run some SMC
> and then print error that it is not othe system you wanted.
> 
> I don't think this is what we want. You basically pollute all of
> other
> users just to have your hypervisor guest additions...
> 
> 
> Best regards,
> Krzysztof


hi Krzysztof,

After some back-and-forth discussion[1][2][3][4][5], we'd like to bring
bakc all the attension of related issues in this thread.

We're going to restore the dt solution on our next version, which means
we would maintain a simple dt for discovering the hypervisor node and
probe for the status of the device when needed.

The reasons are listed below for the record.
- Although dt is for hardware, it's difficult to discover a specific
hypervisor without probing on all subsystem and thus pollute all of
other users[4] as a consequence.
- The GenieZone hypervisor could be considered as a vendor model to
assist platform virtualization whose implementation is independent from
Linuxism.

Please let us if there're any other concerns.

Reference

[1] 
https://android-review.googlesource.com/c/kernel/common/+/2447547/comment/495502f3_bb52344b/
[2] 
https://lore.kernel.org/all/20230428212411.GA292303-robh@kernel.org/
[3] 
https://lore.kernel.org/all/ec4cae2e6da4a64bc3983ffdde03f51e185d3609.camel@mediatek.com/
[4] 
https://lore.kernel.org/lkml/2fe0c7f9-55fc-ae63-3631-8526a0212ccd@linaro.org/
[5] 
https://lore.kernel.org/all/14c0381be38ea40fcd03104bff32bcaa09b920d3.camel@mediatek.com/


Regards,
>