Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933630AbbFKLE5 (ORCPT ); Thu, 11 Jun 2015 07:04:57 -0400 Received: from mga11.intel.com ([192.55.52.93]:24475 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754013AbbFKLBw (ORCPT ); Thu, 11 Jun 2015 07:01:52 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.13,594,1427785200"; d="scan'208";a="741394282" From: Feng Wu To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: pbonzini@redhat.com, mtosatti@redhat.com, alex.williamson@redhat.com, eric.auger@linaro.org, feng.wu@intel.com Subject: [v4 13/16] KVM: x86: kvm-vfio: VT-d posted-interrupts setup Date: Thu, 11 Jun 2015 18:51:49 +0800 Message-Id: <1434019912-15423-14-git-send-email-feng.wu@intel.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1434019912-15423-1-git-send-email-feng.wu@intel.com> References: <1434019912-15423-1-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: 4411 Lines: 137 This patch defines macro __KVM_HAVE_ARCH_KVM_VFIO_POST and implement kvm_arch_vfio_update_pi_irte for x86 architecture. Signed-off-by: Feng Wu --- arch/x86/include/asm/kvm_host.h | 2 + arch/x86/kvm/Makefile | 3 +- arch/x86/kvm/kvm_vfio_x86.c | 85 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 89 insertions(+), 1 deletion(-) create mode 100644 arch/x86/kvm/kvm_vfio_x86.c diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 31a495f..1605bf8 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -81,6 +81,8 @@ static inline gfn_t gfn_to_index(gfn_t gfn, gfn_t base_gfn, int level) (base_gfn >> KVM_HPAGE_GFN_SHIFT(level)); } +#define __KVM_HAVE_ARCH_KVM_VFIO_POST + #define KVM_PERMILLE_MMU_PAGES 20 #define KVM_MIN_ALLOC_MMU_PAGES 64 #define KVM_MMU_HASH_SHIFT 10 diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile index 16e8f96..6bafc89 100644 --- a/arch/x86/kvm/Makefile +++ b/arch/x86/kvm/Makefile @@ -12,7 +12,8 @@ kvm-y += $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o \ kvm-$(CONFIG_KVM_ASYNC_PF) += $(KVM)/async_pf.o kvm-y += x86.o mmu.o emulate.o i8259.o irq.o lapic.o \ - i8254.o ioapic.o irq_comm.o cpuid.o pmu.o + i8254.o ioapic.o irq_comm.o cpuid.o pmu.o \ + kvm_vfio_x86.o kvm-$(CONFIG_KVM_DEVICE_ASSIGNMENT) += assigned-dev.o iommu.o kvm-intel-y += vmx.o kvm-amd-y += svm.o diff --git a/arch/x86/kvm/kvm_vfio_x86.c b/arch/x86/kvm/kvm_vfio_x86.c new file mode 100644 index 0000000..a2d74f9 --- /dev/null +++ b/arch/x86/kvm/kvm_vfio_x86.c @@ -0,0 +1,85 @@ +/* + * Copyright (C) 2014 Intel Corporation. + * Authors: Feng Wu + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include + +/* + * kvm_arch_vfio_update_pi_irte - set IRTE for Posted-Interrupts + * + * @kvm: kvm + * @host_irq: host irq of the interrupt + * @guest_irq: gsi of the interrupt + * @set: set or unset PI + * returns 0 on success, < 0 on failure + */ +int kvm_arch_vfio_update_pi_irte(struct kvm *kvm, unsigned int host_irq, + uint32_t guest_irq, bool set) +{ + struct kvm_kernel_irq_routing_entry *e; + struct kvm_irq_routing_table *irq_rt; + struct kvm_lapic_irq irq; + struct kvm_vcpu *vcpu; + struct vcpu_data vcpu_info; + int idx, ret = -EINVAL; + + idx = srcu_read_lock(&kvm->irq_srcu); + irq_rt = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu); + BUG_ON(guest_irq >= irq_rt->nr_rt_entries); + + hlist_for_each_entry(e, &irq_rt->map[guest_irq], link) { + if (e->type != KVM_IRQ_ROUTING_MSI) + continue; + /* + * VT-d PI cannot support posting multicast/broadcast + * interrupts to a VCPU, we still use interrupt remapping + * for these kind of interrupts. + * + * For lowest-priority interrupts, we only support + * those with single CPU as the destination, e.g. user + * configures the interrupts via /proc/irq or uses + * irqbalance to make the interrupts single-CPU. + * + * We will support full lowest-priority interrupt later. + * + */ + + kvm_set_msi_irq(e, &irq); + if (!kvm_intr_is_single_vcpu(kvm, &irq, &vcpu)) + continue; + + vcpu_info.pi_desc_addr = kvm_x86_ops->get_pi_desc_addr(vcpu); + vcpu_info.vector = irq.vector; + + if (set) + ret = irq_set_vcpu_affinity(host_irq, &vcpu_info); + else { + /* suppress notification event before unposting */ + kvm_x86_ops->pi_set_sn(vcpu); + ret = irq_set_vcpu_affinity(host_irq, NULL); + kvm_x86_ops->pi_clear_sn(vcpu); + } + + if (ret < 0) { + printk(KERN_INFO "%s: failed to update PI IRTE\n", + __func__); + goto out; + } + } + + ret = 0; +out: + srcu_read_unlock(&kvm->irq_srcu, idx); + return ret; +} -- 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/