linux-kernel - Re: [PATCH v2 2/8] x86/mtrr: support setting MTRR state for software defined MTRRs

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Date:   Mon, 13 Feb 2023 16:44:09 +0100
From:   Juergen Gross <jgross@...e.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        lists@...dbynature.de, mikelley@...rosoft.com,
        torvalds@...ux-foundation.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v2 2/8] x86/mtrr: support setting MTRR state for software
 defined MTRRs

On 13.02.23 16:40, Borislav Petkov wrote:
> On Mon, Feb 13, 2023 at 04:18:48PM +0100, Juergen Gross wrote:
>> Yes, you still could construct cases where it would go wrong, but I don't
>> think we should over-engineer it.
> 
> Actually, we should allow only those for which we know they get special
> treatment for MTRRs settings and warn for all the rest.
> 
> And judging by Dave's reply, I think TDX should be in that category too
> since it throws #VEs...
> 

Okay, and it has MTRRs enabled (as Hyper-V SEV-SNP guests), so I shouldn't
test that, I guess (or we should disable the feature before calling the
overwrite function).


Juergen

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