Re: [PATCH v2 5/6] platform/x86: intel_tdx_attest: Add TDX Guest attestation interface driver

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Subject: Re: [PATCH v2 5/6] platform/x86: intel_tdx_attest: Add TDX Guest attestation interface driver
From: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Date: Thu, 8 Jul 2021 18:44:14 -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>, Hans de Goede <hdegoede@xxxxxxxxxx>, Mark Gross <mgross@xxxxxxxxxxxxxxx>, Alexei Starovoitov <ast@xxxxxxxxxx>, Daniel Borkmann <daniel@xxxxxxxxxxxxx>, Andrii Nakryiko <andrii@xxxxxxxxxx>, Peter H Anvin <hpa@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxx>, Tony Luck <tony.luck@xxxxxxxxx>, Kirill Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>, Sean Christopherson <seanjc@xxxxxxxxxx>, Kuppuswamy Sathyanarayanan <knsathya@xxxxxxxxxx>, X86 ML <x86@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, platform-driver-x86@xxxxxxxxxxxxxxx, bpf@xxxxxxxxxxxxxxx, Netdev <netdev@xxxxxxxxxxxxxxx>
In-reply-to: <CAPcyv4gwsT4rJzemkofk6SP5cAp9=nr5T6vtu+i6wTbU91R_Bg@mail.gmail.com>
References: <20210707204249.3046665-1-sathyanarayanan.kuppuswamy@linux.intel.com> <20210707204249.3046665-6-sathyanarayanan.kuppuswamy@linux.intel.com> <CAPcyv4h8SaVL_QGLv1DT0JuoyKmSBvxJQw0aamMuzarexaU7VA@mail.gmail.com> <24d8fd58-36c1-0e89-4142-28f29e2c434b@linux.intel.com> <CAPcyv4heA8gps2K_ckUV1gGJdjGeB+5dOSntS=TREEX5-0rtwQ@mail.gmail.com> <4972fc1a-1ffb-2b6d-e764-471210df96a3@linux.intel.com> <CAPcyv4gwsT4rJzemkofk6SP5cAp9=nr5T6vtu+i6wTbU91R_Bg@mail.gmail.com>
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0

One allocation for the life of the driver that can have its direct map
permissions changed rather than an allocation per-file descriptor and
fragmenting the direct map.


The vmap() approach discussed in another mail will solve that.

-Andi

Follow-Ups:
- Re: [PATCH v2 5/6] platform/x86: intel_tdx_attest: Add TDX Guest attestation interface driver
  - From: Dan Williams

References:
- [PATCH v2 0/6] Add TDX Guest Support (Attestation support)
  - From: Kuppuswamy Sathyanarayanan
- [PATCH v2 5/6] platform/x86: intel_tdx_attest: Add TDX Guest attestation interface driver
  - From: Kuppuswamy Sathyanarayanan
- Re: [PATCH v2 5/6] platform/x86: intel_tdx_attest: Add TDX Guest attestation interface driver
  - From: Dan Williams
- Re: [PATCH v2 5/6] platform/x86: intel_tdx_attest: Add TDX Guest attestation interface driver
  - From: Kuppuswamy, Sathyanarayanan
- Re: [PATCH v2 5/6] platform/x86: intel_tdx_attest: Add TDX Guest attestation interface driver
  - From: Dan Williams
- Re: [PATCH v2 5/6] platform/x86: intel_tdx_attest: Add TDX Guest attestation interface driver
  - From: Andi Kleen
- Re: [PATCH v2 5/6] platform/x86: intel_tdx_attest: Add TDX Guest attestation interface driver
  - From: Dan Williams

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