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The commit b92fe648e9 (vmm: cpu: Disable KVM_FEATURE_ASYNC_PF_INT in
CPUID) disabled APF (Asynchronous Page Fault) mechanism to address
problem that makes vcpu thread spin 100%. As the actual issue is in
KVM, which has been merged in commit 2f15d027c05f (KVM: x86: Properly
handle APF vs disabled LAPIC situation) since 2021, so it's okay to
re-enable APF now.
Signed-off-by: Yi Wang <foxywang@tencent.com>