| Subject | Re: [RFC PATCH v2 68/69] KVM: TDX: add document on TDX MODULE | From | Paolo Bonzini <> | Date | Tue, 6 Jul 2021 16:23:49 +0200 |
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On 03/07/21 00:05, isaku.yamahata@intel.com wrote: > From: Isaku Yamahata <isaku.yamahata@intel.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@intel.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
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