Commit fb3925d0 authored Aug 05, 2019 by Wanpeng Li Committed by Paolo Bonzini Sep 14, 2019

KVM: X86: Use IPI shorthands in kvm guest when support



IPI shorthand is supported now by linux apic/x2apic driver, switch to
IPI shorthand for all excluding self and all including self destination
shorthand in kvm guest, to avoid splitting the target mask into several
PV IPI hypercalls. This patch removes the kvm_send_ipi_all() and
kvm_send_ipi_allbutself() since the callers in APIC codes have already
taken care of apic_use_ipi_shorthand and fallback to ->send_IPI_mask
and ->send_IPI_mask_allbutself if it is false.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Nadav Amit <namit@vmware.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

parent 4b9852f4

arch/x86/kernel/kvm.c

+0 −12

Original line number	Diff line number	Diff line
		@@ -502,16 +502,6 @@ static void kvm_send_ipi_mask_allbutself(const struct cpumask *mask, int vector)
		__send_ipi_mask(local_mask, vector);
		}

		static void kvm_send_ipi_allbutself(int vector)
		{
		kvm_send_ipi_mask_allbutself(cpu_online_mask, vector);
		}

		static void kvm_send_ipi_all(int vector)
		{
		__send_ipi_mask(cpu_online_mask, vector);
		}

		/*
		* Set the IPI entry points
		*/
		@@ -519,8 +509,6 @@ static void kvm_setup_pv_ipi(void)
		{
		apic->send_IPI_mask = kvm_send_ipi_mask;
		apic->send_IPI_mask_allbutself = kvm_send_ipi_mask_allbutself;
		apic->send_IPI_allbutself = kvm_send_ipi_allbutself;
		apic->send_IPI_all = kvm_send_ipi_all;
		pr_info("KVM setup pv IPIs\n");
		}

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