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wrgsbase misemulated in x86_64-softmmu
qemu revision: cfe4cade054c0e0d00d0185cdc433a9e3ce3e2e4
command: ./qemu-system-x86_64 -m 2048 -nographic -net none -smp 4,threads=2 -machine q35 -kernel zircon.bin -cpu Haswell,+smap,-check -initrd bootdata.bin -append 'TERM=screen kernel.halt-on-panic=true '
On this revision, the VM reports CPUID.07H.0H.EBX[0] = 1. In this VM, with CR4[16] set to 1, wrgsbase triggers #UD, which mismatches the behavior described in Intel's instruction reference.
For further data, the faulting instruction is
f3 48 0f ae df wrgsbase %rdi
Fix is in staging: https://github.com/ehabkost/qemu/commit/cdcc80d41360e278b45c91de29a29d797264e85d
Fix is in master: https://github.com/qemu/qemu/commit/e0dd5fd41a1a38766009f442967fab700d2d0550
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