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Date:   Tue, 12 Oct 2021 11:37:19 -0700
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Subject: Re: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(),
 pci_iomap_host_shared_range()
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To:     Christoph Hellwig <hch@infradead.org>,
        "Michael S. Tsirkin" <mst@redhat.com>
Cc:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@linux.intel.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Peter Zijlstra <peterz@infradead.org>,
        Andy Lutomirski <luto@kernel.org>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Richard Henderson <rth@twiddle.net>,
        Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
        James E J Bottomley <James.Bottomley@hansenpartnership.com>,
        Helge Deller <deller@gmx.de>,
        "David S . Miller" <davem@davemloft.net>,
        Arnd Bergmann <arnd@arndb.de>,
        Jonathan Corbet <corbet@lwn.net>,
        Paolo Bonzini <pbonzini@redhat.com>,
        David Hildenbrand <david@redhat.com>,
        Andrea Arcangeli <aarcange@redhat.com>,
        Josh Poimboeuf <jpoimboe@redhat.com>,
        Peter H Anvin <hpa@zytor.com>,
        Dave Hansen <dave.hansen@intel.com>,
        Tony Luck <tony.luck@intel.com>,
        Dan Williams <dan.j.williams@intel.com>,
        Kirill Shutemov <kirill.shutemov@linux.intel.com>,
        Sean Christopherson <seanjc@google.com>,
        Kuppuswamy Sathyanarayanan <knsathya@kernel.org>,
        x86@kernel.org, linux-kernel@vger.kernel.org,
        linux-pci@vger.kernel.org, linux-alpha@vger.kernel.org,
        linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org,
        sparclinux@vger.kernel.org, linux-arch@vger.kernel.org,
        linux-doc@vger.kernel.org,
        virtualization@lists.linux-foundation.org
References: <20211009003711.1390019-1-sathyanarayanan.kuppuswamy@linux.intel.com>
 <20211009003711.1390019-13-sathyanarayanan.kuppuswamy@linux.intel.com>
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 <a070274e-6a3a-fb0a-68ff-d320d0729377@linux.intel.com>
 <20211011142956-mutt-send-email-mst@kernel.org>
 <YWUdpik4SP/7QlbN@infradead.org>
From:   Andi Kleen <ak@linux.intel.com>
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On 10/11/2021 10:31 PM, Christoph Hellwig wrote:
> On Mon, Oct 11, 2021 at 03:09:09PM -0400, Michael S. Tsirkin wrote:
>> The reason we have trouble is that it's not clear what does the API mean
>> outside the realm of TDX.
>> If we really, truly want an API that says "ioremap and it's a hardened
>> driver" then I guess ioremap_hardened_driver is what you want.
> Yes.  And why would be we ioremap the BIOS anyway?  It is not I/O memory
> in any of the senses we generally use ioremap for.

I/O memory is anything outside the kernel memory map.

-Andi