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RE: [PATCH v1 0/7] Implement support for external IPT monitoring
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: "Kang, Luwei" <luwei.kang@xxxxxxxxx>
- Date: Wed, 17 Jun 2020 23:29:58 +0000
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- Thread-topic: [PATCH v1 0/7] Implement support for external IPT monitoring
> > > How does KVM deal with this, do they insert/modify trace packets on
> > > trapped and emulated instructions by the VMM?
> >
> > The KVM includes instruction decoder and
> emulator(arch/x86/kvm/emulate.c), and the guest's memory can be set to
> write-protect as well. But it doesn't support Intel PT packets software
> emulator.
> For KVM, the Intel PT feature will be exposed to KVM guest and KVM guest can
> use Intel PT feature like native.
>
> But if such feature is exposed to the guest for it's own usage, won't it be
> missing packets for instructions emulated by the VMM?
If setting the guest's memory write-protect, I think yes.
Thanks,
Luwei Kang
>
> Thanks, Roger.
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