Tested-by: Xiangfei Ma <xiangfeix.ma@xxxxxxxxx> I have verified this method which can solve the issue. -----Original Message----- From: Zhao, Yan Y <yan.y.zhao@xxxxxxxxx> Sent: Friday, March 22, 2024 9:08 PM To: Sean Christopherson <seanjc@xxxxxxxxxx>; Ma, XiangfeiX <xiangfeix.ma@xxxxxxxxx>; Hao, Xudong <xudong.hao@xxxxxxxxx> Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>; Lai Jiangshan <jiangshanlai@xxxxxxxxx>; Paul E. McKenney <paulmck@xxxxxxxxxx>; Josh Triplett <josh@xxxxxxxxxxxxxxxx>; kvm@xxxxxxxxxxxxxxx; rcu@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Tian, Kevin <kevin.tian@xxxxxxxxx>; Yiwei Zhang <zzyiwei@xxxxxxxxxx> Subject: Re: [PATCH 0/5] KVM: VMX: Drop MTRR virtualization, honor guest PAT Xiangfei found out an failure in kvm unit test rdtsc_vmexit_diff_test with below error log: "FAIL: RDTSC to VM-exit delta too high in 100 of 100 iterations, last = 902 FAIL: Guest didn't run to completion." Fixed it by adding below lines in the unit test rdtsc_vmexit_diff_test before enter guest in my side. vmcs_write(HOST_PAT, 0x6); vmcs_clear_bits(EXI_CONTROLS, EXI_SAVE_PAT); vmcs_set_bits(EXI_CONTROLS, EXI_LOAD_PAT);
