Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933797AbbHKGQs (ORCPT ); Tue, 11 Aug 2015 02:16:48 -0400 Received: from mga14.intel.com ([192.55.52.115]:28594 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933721AbbHKGQk (ORCPT ); Tue, 11 Aug 2015 02:16:40 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.15,651,1432623600"; d="scan'208";a="781701958" From: Feng Wu To: pbonzini@redhat.com, alex.williamson@redhat.com, joro@8bytes.org, mtosatti@redhat.com Cc: eric.auger@linaro.org, kvm@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Feng Wu Subject: [PATCH v6 03/16] KVM: Define a new interface kvm_intr_is_single_vcpu() Date: Tue, 11 Aug 2015 14:03:45 +0800 Message-Id: <1439273038-59463-4-git-send-email-feng.wu@intel.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1439273038-59463-1-git-send-email-feng.wu@intel.com> References: <1439273038-59463-1-git-send-email-feng.wu@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2169 Lines: 70 This patch defines a new interface kvm_intr_is_single_vcpu(), which can returns whether the interrupt is for single-CPU or not. It is used by VT-d PI, since now we only support single-CPU interrupts, For lowest-priority interrupts, if user configures it via /proc/irq or uses irqbalance to make it single-CPU, we can use PI to deliver the interrupts to it. Full functionality of lowest-priority support will be added later. Signed-off-by: Feng Wu --- arch/x86/include/asm/kvm_host.h | 3 +++ arch/x86/kvm/irq_comm.c | 24 ++++++++++++++++++++++++ 2 files changed, 27 insertions(+) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 49ec903..af11bca 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1204,4 +1204,7 @@ int __x86_set_memory_region(struct kvm *kvm, int x86_set_memory_region(struct kvm *kvm, const struct kvm_userspace_memory_region *mem); +bool kvm_intr_is_single_vcpu(struct kvm *kvm, struct kvm_lapic_irq *irq, + struct kvm_vcpu **dest_vcpu); + #endif /* _ASM_X86_KVM_HOST_H */ diff --git a/arch/x86/kvm/irq_comm.c b/arch/x86/kvm/irq_comm.c index 9efff9e..a9572a13 100644 --- a/arch/x86/kvm/irq_comm.c +++ b/arch/x86/kvm/irq_comm.c @@ -297,6 +297,30 @@ out: return r; } +bool kvm_intr_is_single_vcpu(struct kvm *kvm, struct kvm_lapic_irq *irq, + struct kvm_vcpu **dest_vcpu) +{ + int i, r = 0; + struct kvm_vcpu *vcpu; + + kvm_for_each_vcpu(i, vcpu, kvm) { + if (!kvm_apic_present(vcpu)) + continue; + + if (!kvm_apic_match_dest(vcpu, NULL, irq->shorthand, + irq->dest_id, irq->dest_mode)) + continue; + + r++; + *dest_vcpu = vcpu; + } + + if (r == 1) + return true; + else + return false; +} + #define IOAPIC_ROUTING_ENTRY(irq) \ { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \ .u.irqchip = { .irqchip = KVM_IRQCHIP_IOAPIC, .pin = (irq) } } -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/