On Wed, Jun 17, 2020 at 12:37:13PM +0000, Kang, Luwei wrote: > > 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? Thanks, Roger.
