Fix has been included here:
https://gitlab.com/qemu-project/qemu/-/commit/51909241d26fe6fe18a
** Changed in: qemu
Status: New => Fix Released
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1748296
Title:
TCG throws Invalid Opcode when executing x86 BMI shlx instruction
Status in QEMU:
Fix Released
Bug description:
I am unable to use BMI in my project when running under TCG. I
narrowed the problem down to incorrect instruction decoding for BMI
instructions (which have a 2 byte VEX prefix). The gen_sse function in
translate.c reaches the goto label do_0f_38_fx, but b does not equal
0x1f7, 0x2f7, or 0x3f7, so the switch takes the default path and
raises an invalid opcode exception.
The code executes correctly and passes the test under KVM.
I have created a complete repro here: https://github.com/doug65536
/qemu-bmibug
The makefile has the following utility targets:
debug-kvm: Build and run the VM using KVM and wait for gdbstub attach
run: Run the test case with TCG, make fails if the test fails. (It
will fail)
run-kvm: Run the test case with KVM, make fails if the test fails. (It
will succeed)
debug: Build and run the VM with TCG and wait for GDB attach
attach-gdb: Run GDB and attach to QEMU gdbstub
The VM runs with -cpu max. CPUID reports support for BMI, BMI2, and
ABM.
You can quickly verify the issue by executing `make run-kvm` to
confirm that KVM passes, then `make run` to confirm that TCG fails.
I believe the bug affects other BMI, BMI2, and ABM instructions, but I
have only completely verified incorrect execution of SHLX.
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1748296/+subscriptions
