[PATCH RFC 0/2] KVM: x86: Support using the VMX preemption timer for APIC Timer periodic/oneshot mode

From	Wanpeng Li <kernellwp@gmail.com>
Newsgroups	linux.kernel
Subject	[PATCH RFC 0/2] KVM: x86: Support using the VMX preemption timer for APIC Timer periodic/oneshot mode
Date	2016-10-11 14:20 +0200
Message-ID	<sr4ch-6C4-3@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Most windows guests which I have on hand currently still utilize APIC Timer 
periodic/oneshot mode instead of APIC Timer tsc-deadline mode:
- windows 2008 server r2
- windows 2012 server r2
- windows 7
- windows 10 

This patchset adds the support using the VMX preemption timer for APIC Timer 
periodic/oneshot mode. 

I add a print in oneshot mode testcase of kvm-unit-tests/apic.flat and observed
that w/ patch the latency is ~2% of w/o patch. I think maybe something is still 
not right in the patchset, in addition, tmcct in apic_get_tmcct() maybe is not 
calculated correctly. Your comments to improve the patchset is a great appreciated.

Wanpeng Li (2):
  KVM: lapic: Extract start_sw_period() to handle oneshot/periodic mode
  KVM: x86: Support using the vmx preemption timer for APIC Timer periodic/one mode

 arch/x86/kvm/lapic.c | 162 ++++++++++++++++++++++++++++++---------------------
 1 file changed, 95 insertions(+), 67 deletions(-)

-- 
1.9.1

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[PATCH RFC 0/2] KVM: x86: Support using the VMX preemption timer for APIC Timer periodic/oneshot mode Wanpeng Li <kernellwp@gmail.com> - 2016-10-11 14:20 +0200
  [PATCH RFC 2/2] KVM: x86: Support using the VMX preemption timer for APIC Timer periodic/oneshot mode Wanpeng Li <kernellwp@gmail.com> - 2016-10-11 14:20 +0200
    Re: [PATCH RFC 2/2] KVM: x86: Support using the VMX preemption timer  for APIC Timer periodic/oneshot mode Radim Krčmář <rkrcmar@redhat.com> - 2016-10-11 17:10 +0200
      Re: [PATCH RFC 2/2] KVM: x86: Support using the VMX preemption timer  for APIC Timer periodic/oneshot mode Wanpeng Li <kernellwp@gmail.com> - 2016-10-12 10:40 +0200
  [PATCH RFC 1/2] KVM: lapic: Extract start_sw_period() to handle periodic/oneshot mode Wanpeng Li <kernellwp@gmail.com> - 2016-10-11 14:20 +0200

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