KVM: Introduce pv check helpers (a262bca3) · Commits · 戴 / test

arch/x86/kernel/kvm.c

+24 −10

Original line number	Diff line number	Diff line
		@@ -425,7 +425,27 @@ static void __init sev_map_percpu_data(void)
		}
		}

		static bool pv_tlb_flush_supported(void)
		{
		return (kvm_para_has_feature(KVM_FEATURE_PV_TLB_FLUSH) &&
		!kvm_para_has_hint(KVM_HINTS_REALTIME) &&
		kvm_para_has_feature(KVM_FEATURE_STEAL_TIME));
		}

		#ifdef CONFIG_SMP

		static bool pv_ipi_supported(void)
		{
		return kvm_para_has_feature(KVM_FEATURE_PV_SEND_IPI);
		}

		static bool pv_sched_yield_supported(void)
		{
		return (kvm_para_has_feature(KVM_FEATURE_PV_SCHED_YIELD) &&
		!kvm_para_has_hint(KVM_HINTS_REALTIME) &&
		kvm_para_has_feature(KVM_FEATURE_STEAL_TIME));
		}

		#define KVM_IPI_CLUSTER_SIZE (2 * BITS_PER_LONG)

		static void __send_ipi_mask(const struct cpumask *mask, int vector)
		@@ -619,9 +639,7 @@ static void __init kvm_guest_init(void)
		pv_ops.time.steal_clock = kvm_steal_clock;
		}

		if (kvm_para_has_feature(KVM_FEATURE_PV_TLB_FLUSH) &&
		!kvm_para_has_hint(KVM_HINTS_REALTIME) &&
		kvm_para_has_feature(KVM_FEATURE_STEAL_TIME)) {
		if (pv_tlb_flush_supported()) {
		pv_ops.mmu.flush_tlb_others = kvm_flush_tlb_others;
		pv_ops.mmu.tlb_remove_table = tlb_remove_table;
		}
		@@ -632,9 +650,7 @@ static void __init kvm_guest_init(void)
		#ifdef CONFIG_SMP
		smp_ops.smp_prepare_cpus = kvm_smp_prepare_cpus;
		smp_ops.smp_prepare_boot_cpu = kvm_smp_prepare_boot_cpu;
		if (kvm_para_has_feature(KVM_FEATURE_PV_SCHED_YIELD) &&
		!kvm_para_has_hint(KVM_HINTS_REALTIME) &&
		kvm_para_has_feature(KVM_FEATURE_STEAL_TIME)) {
		if (pv_sched_yield_supported()) {
		smp_ops.send_call_func_ipi = kvm_smp_send_call_func_ipi;
		pr_info("KVM setup pv sched yield\n");
		}
		@@ -700,7 +716,7 @@ static uint32_t __init kvm_detect(void)
		static void __init kvm_apic_init(void)
		{
		#if defined(CONFIG_SMP)
		if (kvm_para_has_feature(KVM_FEATURE_PV_SEND_IPI))
		if (pv_ipi_supported())
		kvm_setup_pv_ipi();
		#endif
		}
		@@ -739,9 +755,7 @@ static __init int kvm_setup_pv_tlb_flush(void)
		if (!kvm_para_available() \|\| nopv)
		return 0;

		if (kvm_para_has_feature(KVM_FEATURE_PV_TLB_FLUSH) &&
		!kvm_para_has_hint(KVM_HINTS_REALTIME) &&
		kvm_para_has_feature(KVM_FEATURE_STEAL_TIME)) {
		if (pv_tlb_flush_supported()) {
		for_each_possible_cpu(cpu) {
		zalloc_cpumask_var_node(per_cpu_ptr(&__pv_tlb_mask, cpu),
		GFP_KERNEL, cpu_to_node(cpu));

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