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From: "Ma, XiangfeiX" <xiangfeix.ma@intel.com>
To: "Zhao, Yan Y" <yan.y.zhao@intel.com>, Sean Christopherson
	<seanjc@google.com>, "Hao, Xudong" <xudong.hao@intel.com>
CC: Paolo Bonzini <pbonzini@redhat.com>, Lai Jiangshan
	<jiangshanlai@gmail.com>, "Paul E. McKenney" <paulmck@kernel.org>, "Josh
 Triplett" <josh@joshtriplett.org>, "kvm@vger.kernel.org"
	<kvm@vger.kernel.org>, "rcu@vger.kernel.org" <rcu@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "Tian, Kevin"
	<kevin.tian@intel.com>, Yiwei Zhang <zzyiwei@google.com>
Subject: RE: [PATCH 0/5] KVM: VMX: Drop MTRR virtualization, honor guest PAT
Thread-Topic: [PATCH 0/5] KVM: VMX: Drop MTRR virtualization, honor guest PAT
Thread-Index: AQHafFn+Bj7vmpQOcEW/PEjFxiybeLFIBhdA
Date: Mon, 25 Mar 2024 06:56:28 +0000
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References: <20240309010929.1403984-1-seanjc@google.com>
 <Zf2CvBs7R3KN6rIl@yzhao56-desk.sh.intel.com>
In-Reply-To: <Zf2CvBs7R3KN6rIl@yzhao56-desk.sh.intel.com>
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Tested-by: Xiangfei Ma <xiangfeix.ma@intel.com>

I have verified this method which can solve the issue.

-----Original Message-----
From: Zhao, Yan Y <yan.y.zhao@intel.com>=20
Sent: Friday, March 22, 2024 9:08 PM
To: Sean Christopherson <seanjc@google.com>; Ma, XiangfeiX <xiangfeix.ma@in=
tel.com>; Hao, Xudong <xudong.hao@intel.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>; Lai Jiangshan <jiangshanlai@gmail.=
com>; Paul E. McKenney <paulmck@kernel.org>; Josh Triplett <josh@joshtriple=
tt.org>; kvm@vger.kernel.org; rcu@vger.kernel.org; linux-kernel@vger.kernel=
org; Tian, Kevin <kevin.tian@intel.com>; Yiwei Zhang <zzyiwei@google.com>
Subject: Re: [PATCH 0/5] KVM: VMX: Drop MTRR virtualization, honor guest PA=
T

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 =3D 9=
02
FAIL: Guest didn't run to completion."

Fixed it by adding below lines in the unit test rdtsc_vmexit_diff_test befo=
re enter guest in my side.
vmcs_write(HOST_PAT, 0x6);
vmcs_clear_bits(EXI_CONTROLS, EXI_SAVE_PAT); vmcs_set_bits(EXI_CONTROLS, EX=
I_LOAD_PAT);