In the case of virtualization, how do you use PT ？

[iscaszmh]

Hi, in the case of virtualization, the intel_pt function cannot be found, whether the virtual machine cannot directly access the PT hardware, how should I do
perf list | grep intel_pt

Using PT requires access to MSRs that are not exposed to hypervisor guests by default. This requires a change to the VMCS region. For closed source hypervisors this can pose a challenge. If you can use KVM, you can use the patches from kAFL project to allow PT to be exposed. You should be able to use the new ipt.sys that ships with windows 10 under KVM built with those patches (without using the rest of kAFL unless that fits your needs)

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On Wed, Mar 6, 2019 at 12:16 AM iscaszmh ***@***.***> wrote: Hi, in the case of virtualization, the intel_pt function cannot be found, whether the virtual machine cannot directly access the PT hardware, how should I do perf list | grep intel_pt — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#14>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ADUSW669EVO3R3bjgMj7cRIn5kymZdHGks5vT3lfgaJpZM4bgTFQ> .

[iscaszmh]

Using PT requires access to MSRs that are not exposed to hypervisor guests by default. This requires a change to the VMCS region. For closed source hypervisors this can pose a challenge. If you can use KVM, you can use the patches from kAFL project to allow PT to be exposed. You should be able to use the new ipt.sys that ships with windows 10 under KVM built with those patches (without using the rest of kAFL unless that fits your needs)
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On Wed, Mar 6, 2019 at 12:16 AM iscaszmh @.***> wrote: Hi, in the case of virtualization, the intel_pt function cannot be found, whether the virtual machine cannot directly access the PT hardware, how should I do perf list | grep intel_pt — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#14>, or mute the thread https://github.com/notifications/unsubscribe-auth/ADUSW669EVO3R3bjgMj7cRIn5kymZdHGks5vT3lfgaJpZM4bgTFQ .

Thank you very much for your help. I happen to use KVM and qemu, so I have to study kernel-afl right now