Re: [PATCH v5 16/16] x86/tdx: Add cmdline option to force use of ioremap_host_shared

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To: "Michael S. Tsirkin" <mst@xxxxxxxxxx>, Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>
Subject: Re: [PATCH v5 16/16] x86/tdx: Add cmdline option to force use of ioremap_host_shared
From: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Date: Sun, 10 Oct 2021 19:39:55 -0700
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Bjorn Helgaas <bhelgaas@xxxxxxxxxx>, Richard Henderson <rth@xxxxxxxxxxx>, Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>, James E J Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>, Helge Deller <deller@xxxxxx>, "David S . Miller" <davem@xxxxxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, David Hildenbrand <david@xxxxxxxxxx>, Andrea Arcangeli <aarcange@xxxxxxxxxx>, Josh Poimboeuf <jpoimboe@xxxxxxxxxx>, Peter H Anvin <hpa@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxx>, Tony Luck <tony.luck@xxxxxxxxx>, Dan Williams <dan.j.williams@xxxxxxxxx>, Kirill Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>, Sean Christopherson <seanjc@xxxxxxxxxx>, Kuppuswamy Sathyanarayanan <knsathya@xxxxxxxxxx>, x86@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-pci@xxxxxxxxxxxxxxx, linux-alpha@xxxxxxxxxxxxxxx, linux-mips@xxxxxxxxxxxxxxx, linux-parisc@xxxxxxxxxxxxxxx, sparclinux@xxxxxxxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx, linux-doc@xxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
In-reply-to: <20211009070132-mutt-send-email-mst@kernel.org>
References: <20211009003711.1390019-1-sathyanarayanan.kuppuswamy@linux.intel.com> <20211009003711.1390019-17-sathyanarayanan.kuppuswamy@linux.intel.com> <20211009070132-mutt-send-email-mst@kernel.org>
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The connection is quite unfortunate IMHO.
Can't there be an option
that unbreaks drivers *without* opening up security holes by
making BIOS shared?

That would require new low level APIs that distinguish both cases, and atree sweep.



-Andi

Follow-Ups:
- Re: [PATCH v5 16/16] x86/tdx: Add cmdline option to force use of ioremap_host_shared
  - From: Michael S. Tsirkin

References:
- [PATCH v5 00/16] Add TDX Guest Support (shared-mm support)
  - From: Kuppuswamy Sathyanarayanan
- [PATCH v5 16/16] x86/tdx: Add cmdline option to force use of ioremap_host_shared
  - From: Kuppuswamy Sathyanarayanan
- Re: [PATCH v5 16/16] x86/tdx: Add cmdline option to force use of ioremap_host_shared
  - From: Michael S. Tsirkin

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