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

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Message-ID: <20230306215104.GEZAZgSPa4qBBu9lRd@fat_crate.local>
Date:   Mon, 6 Mar 2023 22:51:04 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     "Michael Kelley (LINUX)" <mikelley@...rosoft.com>,
        Sean Christopherson <seanjc@...gle.com>,
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Subject: Re: [PATCH v5 06/14] x86/ioremap: Support hypervisor specified range
 to map as encrypted

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.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette