From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gleb Natapov Subject: [PATCHv3 4/4] Implement NotifyLongSpinWait HYPER-V hypercall. Date: Sun, 17 Jan 2010 15:51:24 +0200 Message-ID: <1263736284-18780-5-git-send-email-gleb@redhat.com> References: <1263736284-18780-1-git-send-email-gleb@redhat.com> Cc: kvm@vger.kernel.org To: avi@redhat.com, mtosatti@redhat.com Return-path: Received: from mx1.redhat.com ([209.132.183.28]:2626 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752363Ab0AQNvZ (ORCPT ); Sun, 17 Jan 2010 08:51:25 -0500 Received: from int-mx04.intmail.prod.int.phx2.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.17]) by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id o0HDpP1i028335 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Sun, 17 Jan 2010 08:51:25 -0500 In-Reply-To: <1263736284-18780-1-git-send-email-gleb@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: Windows issues this hypercall after guest was spinning on a spinlock for too many iterations. Signed-off-by: Gleb Natapov Signed-off-by: Vadim Rozenfeld --- arch/x86/kvm/x86.c | 10 +++++++++- include/linux/kvm.h | 1 + 2 files changed, 10 insertions(+), 1 deletions(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 99d1d6c..642f2d7 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1565,6 +1565,7 @@ int kvm_dev_ioctl_check_extension(long ext) case KVM_CAP_VCPU_EVENTS: case KVM_CAP_HYPERV: case KVM_CAP_HYPERV_VAPIC: + case KVM_CAP_HYPERV_SPIN: r = 1; break; case KVM_CAP_COALESCED_MMIO: @@ -3825,7 +3826,14 @@ int kvm_hv_hypercall(struct kvm_vcpu *vcpu) trace_kvm_hv_hypercall(code, fast, rep_cnt, rep_idx, ingpa, outgpa); - res = HV_STATUS_INVALID_HYPERCALL_CODE; + switch (code) { + case HV_X64_HV_NOTIFY_LONG_SPIN_WAIT: + kvm_vcpu_on_spin(vcpu); + break; + default: + res = HV_STATUS_INVALID_HYPERCALL_CODE; + break; + } ret = res | (((u64)rep_done & 0xfff) << 32); if (longmode) { diff --git a/include/linux/kvm.h b/include/linux/kvm.h index 5ce6173..4c4937e 100644 --- a/include/linux/kvm.h +++ b/include/linux/kvm.h @@ -499,6 +499,7 @@ struct kvm_ioeventfd { #define KVM_CAP_PPC_SEGSTATE 43 #define KVM_CAP_HYPERV 44 #define KVM_CAP_HYPERV_VAPIC 45 +#define KVM_CAP_HYPERV_SPIN 46 #ifdef KVM_CAP_IRQ_ROUTING -- 1.6.5