linux-kernel - Re: [PATCH 0/5] KVM: VMX: Drop MTRR virtualization, honor guest PAT

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Message-ID: <Zf2CvBs7R3KN6rIl@yzhao56-desk.sh.intel.com>
Date: Fri, 22 Mar 2024 21:08:12 +0800
From: Yan Zhao <yan.y.zhao@...el.com>
To: Sean Christopherson <seanjc@...gle.com>, <xiangfeix.ma@...el.com>,
	<xudong.hao@...el.com>
CC: Paolo Bonzini <pbonzini@...hat.com>, Lai Jiangshan
	<jiangshanlai@...il.com>, "Paul E. McKenney" <paulmck@...nel.org>, "Josh
 Triplett" <josh@...htriplett.org>, <kvm@...r.kernel.org>,
	<rcu@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Kevin Tian
	<kevin.tian@...el.com>, Yiwei Zhang <zzyiwei@...gle.com>
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);