From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752231AbaKJGjN (ORCPT ); Mon, 10 Nov 2014 01:39:13 -0500 Received: from mga11.intel.com ([192.55.52.93]:54503 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751869AbaKJGgh (ORCPT ); Mon, 10 Nov 2014 01:36:37 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.07,351,1413270000"; d="scan'208";a="629364143" From: Feng Wu To: gleb@kernel.org, pbonzini@redhat.com, dwmw2@infradead.org, joro@8bytes.org, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, x86@kernel.org Cc: kvm@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Feng Wu Subject: [PATCH 09/13] KVM: Change NDST field after VCPU scheduling Date: Mon, 10 Nov 2014 14:26:48 +0800 Message-Id: <1415600812-27773-10-git-send-email-feng.wu@intel.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1415600812-27773-1-git-send-email-feng.wu@intel.com> References: <1415600812-27773-1-git-send-email-feng.wu@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch changes the NDST filed of Posted-Interrupts Descriptor after VCPU is scheduled to another physical CPU. Signed-off-by: Feng Wu --- arch/x86/kvm/vmx.c | 25 +++++++++++++++++++++++++ 1 files changed, 25 insertions(+), 0 deletions(-) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 4c1a966..fa77714 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -1906,6 +1906,31 @@ static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu) vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */ vmx->loaded_vmcs->cpu = cpu; } + + if (irq_post_enabled && (vcpu->cpu != cpu)) { + struct pi_desc *pi_desc = vcpu_to_pi_desc(vcpu); + struct pi_desc old, new; + unsigned int dest; + + memset(&old, 0, sizeof(old)); + memset(&new, 0, sizeof(new)); + + pi_set_sn(pi_desc); + + do { + old.control = new.control = pi_desc->control; + + dest = cpu_physical_id(cpu); + + if (x2apic_mode) + new.ndst = dest; + else + new.ndst = (dest << 8) & 0xFF00; + + } while (cmpxchg(&pi_desc->control, old.control, + new.control) != old.control); + pi_clear_sn(pi_desc); + } } static void vmx_vcpu_put(struct kvm_vcpu *vcpu) -- 1.7.1