Wanpeng Li 379a3c8ee4 KVM: VMX: Optimize posted-interrupt delivery for timer fastpath ... While optimizing posted-interrupt delivery especially for the timer fastpath scenario, I measured kvm_x86_ops.deliver_posted_interrupt() to introduce substantial latency because the processor has to perform all vmentry tasks, ack the posted interrupt notification vector, read the posted-interrupt descriptor etc. This is not only slow, it is also unnecessary when delivering an interrupt to the current CPU (as is the case for the LAPIC timer) because PIR->IRR and IRR->RVI synchronization is already performed on vmentry Therefore skip kvm_vcpu_trigger_posted_interrupt in this case, and instead do vmx_sync_pir_to_irr() on the EXIT_FASTPATH_REENTER_GUEST fastpath as well. Tested-by: Haiwei Li <lihaiwei@tencent.com> Cc: Haiwei Li <lihaiwei@tencent.com> Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Wanpeng Li <wanpengli@tencent.com> Message-Id: <1588055009-12677-6-git-send-email-wanpengli@tencent.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>		2020-05-15 12:26:20 -04:00
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kvm	KVM: VMX: Optimize posted-interrupt delivery for timer fastpath	2020-05-15 12:26:20 -04:00
lib	KVM: lib: use jump label to handle resource release in irq_bypass_register_producer()	2020-01-08 18:16:01 +01:00
Makefile	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00