The original single target IPI fastpath patch forgot to filter the ICR destination shorthand field. Multicast IPI is not suitable for this feature since wakeup the multiple sleeping vCPUs will extend the interrupt disabled time, it especially worse in the over-subscribe and VM has a little bit more vCPUs scenario. Let's narrow it down to single target IPI. In addition, this patchset micro-optimize virtual IPI emulation sequence for fastpath. Wanpeng Li (3): KVM: X86: Delay read msr data iff writes ICR MSR KVM: X86: Narrow down the IPI fastpath to single target IPI KVM: X86: Micro-optimize IPI fastpath delay arch/x86/kvm/lapic.c | 4 ++-- arch/x86/kvm/lapic.h | 1 + arch/x86/kvm/x86.c | 14 +++++++++++--- 3 files changed, 14 insertions(+), 5 deletions(-) -- 2.7.4
