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

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Date:   Fri, 9 Jun 2023 17:22:23 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Yi-De Wu <yi-de.wu@...iatek.com>,
        Yingshiuan Pan <yingshiuan.pan@...iatek.com>,
        Ze-Yu Wang <ze-yu.wang@...iatek.com>,
        Jonathan Corbet <corbet@....net>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-arch@...r.kernel.org,
        linux-mediatek@...ts.infradead.org,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Conor Dooley <conor+dt@...nel.org>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        David Bradil <dbrazdil@...gle.com>,
        Jade Shih <jades.shih@...iatek.com>,
        Miles Chen <miles.chen@...iatek.com>,
        Ivan Tseng <ivan.tseng@...iatek.com>,
        My Chuang <my.chuang@...iatek.com>,
        Shawn Hsiao <shawn.hsiao@...iatek.com>,
        PeiLun Suei <peilun.suei@...iatek.com>,
        Liju Chen <liju-clr.chen@...iatek.com>,
        Willix Yeh <chi-shen.yeh@...iatek.com>
Subject: Re: [PATCH v4 2/9] virt: geniezone: Add GenieZone hypervisor support

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