hypercall in ubuntu_kvm_unit_test failed with "Unhandled exception 6 #UD at ip 0000000000400314" with J-realtime on openstack AMD64

[Po-Hsu Lin]

hypercall test in ubuntu_kvm_unit_test will fail with J-realtime on openstack amd64 instance. This issue can be seen after we start testing on openstack with 5.15.0-1036.39 in sru-20230320.

Test log:
 Running '/home/ubuntu/autotest/client/tmp/ubuntu_kvm_unit_tests/src/kvm-unit-tests/tests/hypercall'
 BUILD_HEAD=d8edb59a
 timeout -k 1s --foreground 90s /usr/bin/qemu-system-x86_64 --no-reboot -nodefaults -device pc-testdev -device isa-debug-exit,iobase=0xf4,iosize=0x4 -vnc none -serial stdio -device pci-testdev -machine accel=tcg -kernel /tmp/tmp.Zn8ANQZd6Q -smp 1 # -initrd /tmp/tmp.YdHh1YcSqn
 enabling apic
 smp: waiting for 0 APs
 Unhandled exception 6 #UD at ip 0000000000400314
 error_code=0000 rflags=00000046 cs=00000008
 rax=00000000ffffffff rcx=00000000c0010007 rdx=00000000005110c0 rbx=0000000000000001
 rbp=00000000005110a0 rsi=0000000000511700 rdi=0000000000000001
  r8=00000000c0010206 r9=0000000000000000 r10=000000000000000d r11=0000000000000000
 r12=0000000000000000 r13=0000000000000000 r14=0000000000000000 r15=0000000000000000
 cr0=0000000080000011 cr2=0000000000000000 cr3=000000000040c000 cr4=0000000000000020
 cr8=0000000000000000
     STACK: @400314 40021d
 FAIL hypercall

This issue still exist with the latest upstream kvm-unit-tests code (02d8befe99f8)
It's worthy to note that this test has passed with j/ibm on openstack amd64.