linux-kernel - Re: [PATCH] KVM: VMX: switch to hrtimer for TSC deadline timer when L2 guest is running

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Message-ID: <CANRm+Cwfwm3ENPxsh5y+tyvQXir82fruVqJVSfU-gioe2A+N7w@mail.gmail.com>
Date:	Wed, 6 Jul 2016 13:37:03 +0800
From:	Wanpeng Li <kernellwp@...il.com>
To:	Haozhong Zhang <haozhong.zhang@...el.com>
Cc:	kvm <kvm@...r.kernel.org>, Paolo Bonzini <pbonzini@...hat.com>,
	Radim Krcmar <rkrcmar@...hat.com>,
	Yunhong Jiang <yunhong.jiang@...el.com>,
	Wanpeng Li <wanpeng.li@...mail.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jan Kiszka <jan.kiszka@...mens.com>
Subject: Re: [PATCH] KVM: VMX: switch to hrtimer for TSC deadline timer when
 L2 guest is running

Cc Jan,
2016-07-06 13:10 GMT+08:00 Haozhong Zhang <haozhong.zhang@...el.com>:
> A different VMCS is loaded when L2 guest is running, so it's incorrect
> to use the VMX preemption timer for L1 TSC deadline timer. This patch
> switches to hrtimer for L1 TSC deadline timer when entering L2 guest,
> and switches back to VMX preemption timer when nested VMEXIT from L2 to
> L1.

Nested preemption timer is emulated by hrtimer, so it doesn't
influence vmcs02, why this is needed?

Regards,
Wanpeng Li