KVM: VMX: Add SGX ENCLS[ECREATE] handler to enforce CPUID restrictions

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Add an ECREATE handler that will be used to intercept ECREATE for the
purpose of enforcing and enclave's MISCSELECT, ATTRIBUTES and XFRM, i.e.
to allow userspace to restrict SGX features via CPUID.  ECREATE will be
intercepted when any of the aforementioned masks diverges from hardware
in order to enforce the desired CPUID model, i.e. inject #GP if the
guest attempts to set a bit that hasn't been enumerated as allowed-1 in
CPUID.

Note, access to the PROVISIONKEY is not yet supported.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Co-developed-by: Kai Huang <kai.huang@intel.com>
Signed-off-by: Kai Huang <kai.huang@intel.com>
Message-Id: <c3a97684f1b71b4f4626a1fc3879472a95651725.1618196135.git.kai.huang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Sean Christopherson 2021-04-12 16:21:39 +12:00 • committed by Paolo Bonzini

parent 9798adbc04

commit 70210c044b

2 changed files with 278 additions and 0 deletions

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3

arch/x86/include/asm/kvm_host.h

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275

arch/x86/kvm/vmx/sgx.c

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