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

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Message-ID: <SJ0PR11MB594067997E7879AF927F264686362@SJ0PR11MB5940.namprd11.prod.outlook.com>
Date: Mon, 25 Mar 2024 06:56:28 +0000
From: "Ma, XiangfeiX" <xiangfeix.ma@...el.com>
To: "Zhao, Yan Y" <yan.y.zhao@...el.com>, Sean Christopherson
	<seanjc@...gle.com>, "Hao, Xudong" <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"
	<kvm@...r.kernel.org>, "rcu@...r.kernel.org" <rcu@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "Tian, Kevin"
	<kevin.tian@...el.com>, Yiwei Zhang <zzyiwei@...gle.com>
Subject: RE: [PATCH 0/5] KVM: VMX: Drop MTRR virtualization, honor guest PAT

Tested-by: Xiangfei Ma <xiangfeix.ma@...el.com>

I have verified this method which can solve the issue.

-----Original Message-----
From: Zhao, Yan Y <yan.y.zhao@...el.com> 
Sent: Friday, March 22, 2024 9:08 PM
To: Sean Christopherson <seanjc@...gle.com>; Ma, XiangfeiX <xiangfeix.ma@...el.com>; Hao, Xudong <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.kernelorg; Tian, Kevin <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);