Hardware Breakpoints not tirggered without vt-x

[hwbpfan]

hello,

hardware Breakpoints are a basic cpu feature of the x86 and x64 architectures. In virtualbox, this feature does not work if vt-x is disabled or not present, even though HWBPs have nothing to do with vt-x.

the problem has been previously mentioned and partly resolved here:

virtualbox.org/ticket/477

but is still present in latest version 424. The expected interrupts are just swallowed by the VMM.

To reproduce this issue, disable vt-x for a specific machine and use your favourite debugger to set a hardware breakpoint. I suggest you try windows+ollydbg (ollydbg.de), as it`s very easy to use.

Didnt attach any logs as it?s very easy to reproduce on any machine and there`s nothing interesting in the logs.

[hwbpfan]

upon further investigation, Debug Register 5&6 are not handled correctly. Mostly they are zero, when they shouldnt be.

[Frank Mehnert]

Sorry, but opening duplicate tickets will only increase the load of the developers. The source code is open source available so feel free to submit a patch.