This patch optimizes the virtual IPI emulation sequence: write ICR2 write ICR2 write ICR read ICR2 read ICR ==> send virtual IPI read ICR2 write ICR send virtual IPI It can reduce kvm-unit-tests/vmexit.flat IPI testing latency(from sender send IPI to sender receive the ACK) from 3319 cycles to 3203 cycles on SKylake server. Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Radim Krčmář <rkrcmar@redhat.com> Signed-off-by: Wanpeng Li <wanpengli@tencent.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> |
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Kconfig |