Hi, This test aims to verify that when entering a guest in HLT activity state but with a pending interrupt in RVI, the guest is in fact not halted and an interrupt is indeed injected. For more information, see commit message of kernel patch "KVM: nVMX: Wake blocked vCPU in guest-mode if pending interrupt in virtual APICv". 1st patch introduce util to disable intercept on x2APIC MSRs. 2nd patch inroduce util to enable virtual interrupt delivery. 3rd patch adds the test itself. Regards, -Liran