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Enclaves have two basic states. They are either being built and are
malleable and can be modified by doing things like adding pages. Or,
they are locked down and not accepting changes. They can only be run
after they have been locked down. The ENCLS[EINIT] function induces the
transition from being malleable to locked-down.
Add an ioctl() that performs ENCLS[EINIT]. After this, new pages can
no longer be added with ENCLS[EADD]. This is also the time where the
enclave can be measured to verify its integrity.
Co-developed-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Tested-by: Jethro Beekman <jethro@fortanix.com>
Link: https://lkml.kernel.org/r/20201112220135.165028-15-jarkko@kernel.org
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