target/i386: Add support of KVM_FEATURE_ASYNC_PF_VMEXIT for guest

KVM_FEATURE_ASYNC_PF_VMEXIT has been introduced for years, however QEMU
doesn't support expose it to guest. Add support for it.

Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Message-ID: <20231024083354.1171308-1-xiaoyao.li@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

target/i386/cpu.c

@@ -857,7 +857,7 @@ FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
         .feat_names = {
             "kvmclock", "kvm-nopiodelay", "kvm-mmu", "kvmclock",
             "kvm-asyncpf", "kvm-steal-time", "kvm-pv-eoi", "kvm-pv-unhalt",
-            NULL, "kvm-pv-tlb-flush", NULL, "kvm-pv-ipi",
+            NULL, "kvm-pv-tlb-flush", "kvm-asyncpf-vmexit", "kvm-pv-ipi",
             "kvm-poll-control", "kvm-pv-sched-yield", "kvm-asyncpf-int", "kvm-msi-ext-dest-id",
             NULL, NULL, NULL, NULL,
             NULL, NULL, NULL, NULL,