linux-kernel - Re: [RFC PATCH v2 68/69] KVM: TDX: add document on TDX MODULE

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Date:   Tue, 6 Jul 2021 16:23:49 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     isaku.yamahata@...el.com, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, erdemaktas@...gle.com,
        Connor Kuehl <ckuehl@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     isaku.yamahata@...il.com
Subject: Re: [RFC PATCH v2 68/69] KVM: TDX: add document on TDX MODULE

On 03/07/21 00:05, isaku.yamahata@...el.com wrote:
> From: Isaku Yamahata <isaku.yamahata@...el.com>
> 
> Add a document on how to integrate TDX MODULE into initrd so that
> TDX MODULE can be updated on kernel startup.
> 
> Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
> ---
>   Documentation/virt/kvm/tdx-module.rst | 48 +++++++++++++++++++++++++++
>   1 file changed, 48 insertions(+)
>   create mode 100644 Documentation/virt/kvm/tdx-module.rst
> 
> diff --git a/Documentation/virt/kvm/tdx-module.rst b/Documentation/virt/kvm/tdx-module.rst
> new file mode 100644
> index 000000000000..8beea8302f94
> --- /dev/null
> +++ b/Documentation/virt/kvm/tdx-module.rst
> @@ -0,0 +1,48 @@
> +.. SPDX-License-Identifier: GPL-2.0
> +
> +==========
> +TDX MODULE
> +==========
> +
> +Integrating TDX MODULE into initrd
> +==================================
> +If TDX is enabled in KVM(CONFIG_KVM_INTEL_TDX=y), kernel is able to load
> +tdx seam module from initrd.
> +The related modules (seamldr.ac, libtdx.so and libtdx.so.sigstruct) need to be
> +stored in initrd.
> +
> +tdx-seam is a sample hook script for initramfs-tools.
> +TDXSEAM_SRCDIR are the directory in the host file system to store files related
> +to TDX MODULE.
> +
> +Since it heavily depends on distro how to prepare initrd, here's a example how
> +to prepare an initrd.
> +(Actually this is taken from Documentation/x86/microcode.rst)
> +::
> +  #!/bin/bash
> +
> +  if [ -z "$1" ]; then
> +      echo "You need to supply an initrd file"
> +      exit 1
> +  fi
> +
> +  INITRD="$1"
> +
> +  DSTDIR=lib/firmware/intel-seam
> +  TMPDIR=/tmp/initrd
> +  LIBTDX="/lib/firmware/intel-seam/seamldr.acm /lib/firmware/intel-seam/libtdx.so /lib/firmware/intel-seam/libtdx.so.sigstruct"
> +
> +  rm -rf $TMPDIR
> +
> +  mkdir $TMPDIR
> +  cd $TMPDIR
> +  mkdir -p $DSTDIR
> +
> +  cp ${LIBTDX} ${DSTDIR}
> +
> +  find . | cpio -o -H newc > ../tdx-seam.cpio
> +  cd ..
> +  mv $INITRD $INITRD.orig
> +  cat tdx-seam.cpio $INITRD.orig > $INITRD
> +
> +  rm -rf $TMPDIR
> 

I think this belongs in a different series that adds SEAM loading?

Paolo