[Qemu-devel] [Bug 1719984] Re: wrgsbase misemulated in x86_64-softmmu

[Todd Eisenberger]

For further data, the faulting instruction is
f3 48 0f ae df          wrgsbase %rdi

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https://bugs.launchpad.net/bugs/1719984

Title:
  wrgsbase misemulated in x86_64-softmmu

Status in QEMU:
  New

Bug description:
  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.

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