Messages in this thread | | | Subject | Re: [PATCH] KVM: VMX: switch to hrtimer for TSC deadline timer when L2 guest is running | From | Paolo Bonzini <> | Date | Wed, 6 Jul 2016 08:04:09 +0200 |
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On 06/07/2016 07:37, Wanpeng Li wrote: > Cc Jan, > 2016-07-06 13:10 GMT+08:00 Haozhong Zhang <haozhong.zhang@intel.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?
I agree (and nested APIC timer is emulated by L1). Because the L1 APIC timer is set in the preemption timer before vmentry, this should not be necessary.
Paolo
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