netdev - Re: [PATCH v5 06/14] x86/ioremap: Support hypervisor specified range to map as encrypted

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Date:   Thu, 09 Mar 2023 11:12:10 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...el.com>
Cc:     "Michael Kelley (LINUX)" <mikelley@...rosoft.com>,
        Sean Christopherson <seanjc@...gle.com>,
        "hpa@...or.com" <hpa@...or.com>, KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        Dexuan Cui <decui@...rosoft.com>,
        "luto@...nel.org" <luto@...nel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
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        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
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        "sathyanarayanan.kuppuswamy@...ux.intel.com" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
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        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
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        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>
Subject: Re: [PATCH v5 06/14] x86/ioremap: Support hypervisor specified
 range to map as encrypted

On Mon, 2023-03-06 at 22:51 +0100, Borislav Petkov wrote:
> On Thu, Feb 23, 2023 at 12:27:50PM -0800, Dave Hansen wrote:
> > On 2/23/23 12:01, Michael Kelley (LINUX) wrote:
> > > Dave Hansen:  Are you also OK with Sean's proposal?  Looking for consensus
> > > here ....
> > 
> > Yeah, I'm generally OK with it as long as Borislav is.
> 
> Right, I think we're ok with the following basic rules:
> 
> - pure arch/x86/ code should use the x86_platform function pointers to
>   query hypervisor capabilities/peculiarities
> 
> - cc_platform_has() should be used in generic/driver code as it
>   abstracts away the underlying platform better. IOW, querying
>   x86_platform.... in generic, platform-agnostic driver code looks weird to
>   say the least
> 
> The hope is that those two should be enough to support most guest types
> and not let the zoo get too much out of hand...
> 
> Thx.

In 
https://lore.kernel.org/all/20230308171328.1562857-13-usama.arif@bytedance.com/
I added an sev_es_active() helper for x86 code.

Is that consistent with the vision here, or should I do something different?


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