Messages in this thread | | | Subject | Re: [PATCH 19/61] KVM: VMX: Add helpers to query Intel PT mode | From | Paolo Bonzini <> | Date | Tue, 25 Feb 2020 15:54:21 +0100 |
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On 24/02/20 23:18, Sean Christopherson wrote: >>> { >>> u32 vmexit_ctrl = vmcs_config.vmexit_ctrl; >>> - if (pt_mode == PT_MODE_SYSTEM) >>> + if (vmx_pt_mode_is_system()) >> ... and here? I.e. to cover the currently unsupported 'host-only' mode. > Hmm, good question. I don't think so? On VM-Enter, RTIT_CTL would need to > be loaded to disable PT. Clearing RTIT_CTL on VM-Exit would be redundant > at that point[1]. And AIUI, the PIP for VM-Enter/VM-Exit isn't needed > because there is no context switch from the decoder's perspective.
How does host-only mode differ from "host-guest but don't expose PT to the guest"? So I would say that host-only mode is a special case of host-guest, not of system mode.
Paolo
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