[5.15-velinux] Intel: backport KVM Fix for Clearing SGX EDECCSSA to 5.15

[zhiquan1-li]

This PR includes incremental backporting patches which mainly covers some SGX bug fixes which are missing in VeLinux.

About the patches The total patch number is 4:

5f4d1fd5b5d3 selftests/sgx: Ignore OpenSSL 3.0 deprecated functions warning
ee56a283988d x86/sgx: Improve comments for sgx_encl_lookup/alloc_backing()
370839c241f7 x86/sgx: Allow enclaves to use Asynchrounous Exit Notification
7efb4d8a392a KVM: VMX: Also clear SGX EDECCSSA in KVM CPU caps when SGX is disabled

Tests

1. Build successfully for each commit
2. Kernel selftest - SGX: PASSED

cd tools/testing/selftests/sgx/
make
./test_sgx

3. Kernel selftest - SGX in VM: PASSED
4. Function test

Step 1. Original SGX EDECCSSA status in guest

[root@guest ~]# cpuid -1 -l 0x12
CPU:
   Software Guard Extensions (SGX) capability (0x12/0):
      SGX1 supported                           = true
      SGX2 supported                           = true
      SGX ENCLV E*VIRTCHILD, ESETCONTEXT       = false
      SGX ENCLS ETRACKC, ERDINFO, ELDBC, ELDUC = false
      SGX ENCLU EVERIFYREPORT2                 = false
      SGX ENCLS EUPDATESVN                     = false
      SGX ENCLU EDECCSSA                       = true
      MISCSELECT.EXINFO supported: #PF & #GP   = true
      MISCSELECT.CPINFO supported: #CP         = false
      MaxEnclaveSize_Not64 (log2)              = 0x1f (31)
      MaxEnclaveSize_64 (log2)                 = 0x38 (56)

Step 2. Disable SGX in guest

root@KVM-host:~# rmmod kvm_intel
root@KVM-host:~# modprobe kvm_intel sgx=0 

Step 3. The SGX EDECCSSA capability is cleared in KVM, then its status becomes false

[root@guest ~]# cpuid -1 -l 0x12
CPU:
   Software Guard Extensions (SGX) capability (0x12/0):
      SGX1 supported                           = false
      SGX2 supported                           = false
      SGX ENCLV E*VIRTCHILD, ESETCONTEXT       = false
      SGX ENCLS ETRACKC, ERDINFO, ELDBC, ELDUC = false
      SGX ENCLU EVERIFYREPORT2                 = false
      SGX ENCLS EUPDATESVN                     = false
      SGX ENCLU EDECCSSA                       = false
      MISCSELECT.EXINFO supported: #PF & #GP   = false
      MISCSELECT.CPINFO supported: #CP         = false
      MaxEnclaveSize_Not64 (log2)              = 0x0 (0)
      MaxEnclaveSize_64 (log2)                 = 0x0 (0)
[root@TDX-guest ~]# 

Known issue: None

Default config change: None

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[zhiquan1-li]

Will re-submit to avoid CLA check.