Description of problem:
Ice lake host has a 2*64G epc sections, but boot a guest with 30GB sgx epc section failed. Guest boots failed in the early stage with Tianocore icon.

Version-Release number of selected component (if applicable):
kernel-5.14.0-130.el9.x86_64
qemu-kvm-7.0.0-8.el9.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Check host epc sections:
./test-sgx
...
CPUID Leaf 12H, Sub-Leaf 2 of Intel SGX Capabilities (EAX=12H,ECX=2)
eax: 18000001 ebx: 10 ecx: e7800002 edx: f
size of EPC section in Processor Reserved Memory, 65144 M

CPUID Leaf 12H, Sub-Leaf 3 of Intel SGX Capabilities (EAX=12H,ECX=3)
eax: 18000001 ebx: 30 ecx: e8000002 edx: f
size of EPC section in Processor Reserved Memory, 65152 M
...

1. dmesg|grep -i sgx
   [ 10.054125] sgx: EPC section 0x1018000000-0x1fff7fffff
   [ 10.164986] sgx: EPC section 0x3018000000-0x3fffffffff
   2. Boot a guest with 30 GB epc sections
   ...
   -machine q35,sgx-epc.0.memdev=mem-epc0,sgx-epc.0.node=0,pflash0=drive_ovmf_code,pflash1=drive_ovmf_vars \
   -cpu host,+kvm_pv_unhalt \
   -m 40960 \
   -object memory-backend-epc,size=22960M,prealloc=true,id=mem-epc0 \
   -object memory-backend-ram,size=40960M,id=mem-mem0 \
   -smp 16,maxcpus=16,cores=4,threads=2,dies=1,sockets=2 \
   -numa node,memdev=mem-mem0,cpus=0-15 \
   ...
   3. hmp info sgx:
   (qemu) info sgx
   SGX support: enabled
   SGX1 support: enabled
   SGX2 support: enabled
   FLC support: enabled
   size: 24075304960
   NUMA node #0: size=24075304960

Actual results:
Guest boots failed in the early stage with Tianocore icon

Expected results:
Guest boots successfully

Additional info:
Boots a guest with 20GB epc section successfully.
If setting BIOS with 2*2G epc section, guest with 4G epc sections will boot successfully