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As the bug seems to rely on a maximum instruction length that is present in hardware x86 but not in QEMU's x86, the reach of this particular bug seems to be just the software emulated mode.

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Yes, I get that. I was wondering how widely used is qemu in x86 software mode

It might be used for special applications, but not for your typical server that is connected to the internet, simply because it's horribly slow compared to the virtualization support (VT-x / AMD-V) most modern CPUs offer since at least 2010.

Right, if you're running on x86 hardware. The use case is probably non-x86 hardware running x86 VMs.

For example, I remember using qemu to emulate RPi with ARM software emulation on my x86 machine.

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