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Date:   Thu, 14 Oct 2021 22:50:59 -0700
From:   Andi Kleen <>
To:     "Michael S. Tsirkin" <>
Cc:     Kuppuswamy Sathyanarayanan 
        Thomas Gleixner <>,
        Ingo Molnar <>, Borislav Petkov <>,
        Peter Zijlstra <>,
        Andy Lutomirski <>,
        Bjorn Helgaas <>,
        Richard Henderson <>,
        Thomas Bogendoerfer <>,
        James E J Bottomley <>,
        Helge Deller <>,
        "David S . Miller" <>,
        Arnd Bergmann <>,
        Jonathan Corbet <>,
        Paolo Bonzini <>,
        David Hildenbrand <>,
        Andrea Arcangeli <>,
        Josh Poimboeuf <>,
        Peter H Anvin <>,
        Dave Hansen <>,
        Tony Luck <>,
        Dan Williams <>,
        Kirill Shutemov <>,
        Sean Christopherson <>,
        Kuppuswamy Sathyanarayanan <>,,,,,,,,,,
Subject: Re: [PATCH v5 16/16] x86/tdx: Add cmdline option to force use of

> I thought you basically create an OperationRegion of SystemMemory type,
> and off you go. Maybe the OSPM in Linux is clever and protects
> some memory, I wouldn't know.

I investigated this now, and it looks like acpi is using 
ioremap_cache(). We can hook into that and force non sharing. It's 
probably safe to assume that this is not used on real IO devices.

I think there are still some other BIOS mappings that use just plain 
ioremap() though.


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