linux-kernel - Re: [PATCH v8 00/33] x86: enable FRED for x86-64

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Date:   Mon, 10 Apr 2023 12:38:32 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Borislav Petkov <bp@...en8.de>, "Li, Xin3" <xin3.li@...el.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "andrew.cooper3@...rix.com" <andrew.cooper3@...rix.com>,
        "Christopherson,, Sean" <seanjc@...gle.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        "jiangshanlai@...il.com" <jiangshanlai@...il.com>,
        "Kang, Shan" <shan.kang@...el.com>,
        "Lutomirski, Andy" <luto@...nel.org>
Subject: Re: [PATCH v8 00/33] x86: enable FRED for x86-64

On 4/10/23 12:32, Borislav Petkov wrote:
> On Mon, Apr 10, 2023 at 07:14:21PM +0000, Li, Xin3 wrote:
>>> Basically, if anyone else has been procrastinating on reviewing this set, now is
>>> probably the time to dig in.  (I'll include myself in that category, btw)
>> I really appreciate it!
> That doesn't mean that you should patch-bomb people once a week even
> without any review happening.
> 
> Is FRED in any hardware incarnation to rush it?

Which reminds me...  It is always appreciated when hardware vendors can
put a stake in the ground about where and how a feature will show up.
It's great that you said that it is SIMICS-only for now.  That's a start.

But, if you could, for instance say things like (and I'm totally pulling
these out of my rear end):

	FRED will be available only on server CPUs
or
	FRED will be available across all Intel CPUs
or
	FRED will start showing up in CPUs that are released
	in roughly 2033

it would be nice to know that.

Here's what I said for protection keys, for example:

> https://lore.kernel.org/linux-mm/20160212210152.9CAD15B0@viggo.jf.intel.com/