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>
Subject: Re: [PATCH v5 16/16] x86/tdx: Add cmdline option to force use of ioremap_host_shared
From: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Date: Tue, 12 Oct 2021 10:55:20 -0700
Cc: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>, 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: <20211011142330-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> <8c906de6-5efa-b87a-c800-6f07b98339d0@linux.intel.com> <20211011075945-mutt-send-email-mst@kernel.org> <9d0ac556-6a06-0f2e-c4ff-0c3ce742a382@linux.intel.com> <20211011142330-mutt-send-email-mst@kernel.org>
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.2.0

I mean ... it's already wide spread.



I meant wide spread usage with confidential guests.

If we support it with TDX
it will be used with TDX.

It has some security trade offs. The main reason to use TDX is security.Also when people take the VT-d tradeoffs they might be ok with the BIOStrade offs too.


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