From patchwork Thu Feb 10 00:27:15 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Woodhouse X-Patchwork-Id: 12741180 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7DB82C433F5 for ; Thu, 10 Feb 2022 02:08:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231315AbiBJCIz (ORCPT ); Wed, 9 Feb 2022 21:08:55 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:55304 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235899AbiBJCIn (ORCPT ); Wed, 9 Feb 2022 21:08:43 -0500 Received: from desiato.infradead.org (desiato.infradead.org [IPv6:2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 833C6B6B for ; Wed, 9 Feb 2022 18:08:45 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=TqNdvpCfmSXhqFJSoKVWx4TQwHdp3FSWSSRfSqxyXY0=; b=V7Nms1pwSXbtAyYom22/soVSvo cohnmRSFlz1JwUS7vYiR58/ecKFcj+TZdv8CXnRU0Mf08TlvF9h/KcLFL+Emg1AkmyCFEDJ/9seX3 sZQ2r2m9dKBo4xhuWGJa6zdaG7GQxxSgOnFd2JemlLhOe3Mgxw3B7lK+A/S2MB3SD2sOhn5Obvhwb +TXVx4SoShwtcV8VXu7vCeJwYfXs2WnJSGJj5uzoZvV1qqI/hmR0rfRK+xoLPxWizuZKeZFlVPq2B u8TqXE/RoBdr1wrO2i5MpibWii8a0+6lk960hehwP3gC2LA1U5P5VhxFV/ar8H0dgxCaokCsYWYYP RYzdq8fw==; Received: from i7.infradead.org ([2001:8b0:10b:1:21e:67ff:fecb:7a92]) by desiato.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1nHxIy-008YWG-Dl; Thu, 10 Feb 2022 00:27:24 +0000 Received: from dwoodhou by i7.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1nHxIy-0019DN-5U; Thu, 10 Feb 2022 00:27:24 +0000 From: David Woodhouse To: kvm@vger.kernel.org, Paolo Bonzini Cc: Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Joao Martins , Boris Ostrovsky , Metin Kaya , Paul Durrant Subject: [PATCH v0 09/15] KVM: x86/xen: handle PV IPI vcpu yield Date: Thu, 10 Feb 2022 00:27:15 +0000 Message-Id: <20220210002721.273608-10-dwmw2@infradead.org> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20220210002721.273608-1-dwmw2@infradead.org> References: <20220210002721.273608-1-dwmw2@infradead.org> MIME-Version: 1.0 Sender: David Woodhouse X-SRS-Rewrite: SMTP reverse-path rewritten from by desiato.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Joao Martins Cooperative Linux guests after an IPI-many may yield vcpu if any of the IPI'd vcpus were preempted (i.e. runstate is 'runnable'.) Support SCHEDOP_yield for handling yield. Signed-off-by: Joao Martins Signed-off-by: David Woodhouse --- arch/x86/kvm/xen.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c index 909c25521554..3df44c996d66 100644 --- a/arch/x86/kvm/xen.c +++ b/arch/x86/kvm/xen.c @@ -19,6 +19,7 @@ #include #include #include +#include #include "trace.h" @@ -800,6 +801,20 @@ static int kvm_xen_hypercall_complete_userspace(struct kvm_vcpu *vcpu) return kvm_xen_hypercall_set_result(vcpu, run->xen.u.hcall.result); } +static bool kvm_xen_hcall_sched_op(struct kvm_vcpu *vcpu, int cmd, u64 param, u64 *r) +{ + switch (cmd) { + case SCHEDOP_yield: + kvm_vcpu_on_spin(vcpu, true); + *r = 0; + return true; + default: + break; + } + + return false; +} + int kvm_xen_hypercall(struct kvm_vcpu *vcpu) { bool longmode; @@ -840,7 +855,9 @@ int kvm_xen_hypercall(struct kvm_vcpu *vcpu) if (params[0] == EVTCHNOP_send) handled = kvm_xen_hcall_evtchn_send(vcpu, params[1], &r); break; - + case __HYPERVISOR_sched_op: + handled = kvm_xen_hcall_sched_op(vcpu, params[0], params[1], &r); + break; default: break; }