Messages in this thread | | | From | Wanpeng Li <> | Subject | [PATCH RFC V2 0/2] KVM: x86: Support using the VMX preemption timer for APIC Timer periodic/oneshot mode | Date | Wed, 12 Oct 2016 14:52:50 +0800 |
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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 periodic mode testcase to kvm-unit-tests/apic.flat and observed that w/ patch the latency is ~13% of w/o patch. I think maybe something is still not right in the patchset. Your comments to improve the patchset is a great appreciated.
v1 -> v2: * remember the timeout when setting up the timer to get a correct TMCCT * move apic->lapic_timer.period/tscdeadline caculations to start_apic_timer()
Wanpeng Li (2): KVM: lapic: introduce start_sw_period() to handle oneshot/periodic mode KVM: x86: Support using the VMX preemption timer for APIC Timer periodic/oneshot mode
arch/x86/kvm/lapic.c | 166 ++++++++++++++++++++++++++++++++------------------- arch/x86/kvm/lapic.h | 1 + 2 files changed, 107 insertions(+), 60 deletions(-)
-- 1.9.1
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