From patchwork Thu Apr 22 16:11:24 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vitaly Kuznetsov X-Patchwork-Id: 12218863 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1040CC433B4 for ; Thu, 22 Apr 2021 16:21:48 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 70BE7613D5 for ; Thu, 22 Apr 2021 16:21:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 70BE7613D5 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:60050 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lZc5J-0005Lc-P3 for qemu-devel@archiver.kernel.org; Thu, 22 Apr 2021 12:21:46 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:51212) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lZbwW-0003zV-06 for qemu-devel@nongnu.org; Thu, 22 Apr 2021 12:12:40 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:23874) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lZbwT-0003KQ-W9 for qemu-devel@nongnu.org; Thu, 22 Apr 2021 12:12:39 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1619107956; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=n0f+QmoDq3xDEIiauPlOmGQDgBrA7rbR7c3gURmJbVM=; b=PrVc3IJsIQY58HFE1FgXgvh+Th/SVLnO63ob6w3C4YKpkFcGI1VwNbzgWAD0d7yS1nOyRU wylPojDNJZLPqybpVAOzCq6x5dKZa7vkZruw9qbpvmUqwb20BA4B9BBiBTeus7d5gwtkwD 78VbEFXZ6rWfJ86wdO5O52bXp8SfWCk= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-505-xh4M4HD5PIWdq12DGe2ziA-1; Thu, 22 Apr 2021 12:12:04 -0400 X-MC-Unique: xh4M4HD5PIWdq12DGe2ziA-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 7A39C18397A4 for ; Thu, 22 Apr 2021 16:12:03 +0000 (UTC) Received: from vitty.brq.redhat.com (unknown [10.40.194.217]) by smtp.corp.redhat.com (Postfix) with ESMTP id F32775B4A0; Thu, 22 Apr 2021 16:12:01 +0000 (UTC) From: Vitaly Kuznetsov To: qemu-devel@nongnu.org Subject: [PATCH v6 13/19] i386: prefer system KVM_GET_SUPPORTED_HV_CPUID ioctl over vCPU's one Date: Thu, 22 Apr 2021 18:11:24 +0200 Message-Id: <20210422161130.652779-14-vkuznets@redhat.com> In-Reply-To: <20210422161130.652779-1-vkuznets@redhat.com> References: <20210422161130.652779-1-vkuznets@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=vkuznets@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=216.205.24.124; envelope-from=vkuznets@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paolo Bonzini , Marcelo Tosatti , Eduardo Habkost , Igor Mammedov Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" KVM_GET_SUPPORTED_HV_CPUID was made a system wide ioctl which can be called prior to creating vCPUs and we are going to use that to expand Hyper-V cpu features early. Use it when it is supported by KVM. Signed-off-by: Vitaly Kuznetsov Reviewed-by: Eduardo Habkost --- target/i386/kvm/kvm.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c index feec9f25ba12..5d08f3a39ef7 100644 --- a/target/i386/kvm/kvm.c +++ b/target/i386/kvm/kvm.c @@ -928,7 +928,8 @@ static struct { }, }; -static struct kvm_cpuid2 *try_get_hv_cpuid(CPUState *cs, int max) +static struct kvm_cpuid2 *try_get_hv_cpuid(CPUState *cs, int max, + bool do_sys_ioctl) { struct kvm_cpuid2 *cpuid; int r, size; @@ -937,7 +938,11 @@ static struct kvm_cpuid2 *try_get_hv_cpuid(CPUState *cs, int max) cpuid = g_malloc0(size); cpuid->nent = max; - r = kvm_vcpu_ioctl(cs, KVM_GET_SUPPORTED_HV_CPUID, cpuid); + if (do_sys_ioctl) { + r = kvm_ioctl(kvm_state, KVM_GET_SUPPORTED_HV_CPUID, cpuid); + } else { + r = kvm_vcpu_ioctl(cs, KVM_GET_SUPPORTED_HV_CPUID, cpuid); + } if (r == 0 && cpuid->nent >= max) { r = -E2BIG; } @@ -964,13 +969,17 @@ static struct kvm_cpuid2 *get_supported_hv_cpuid(CPUState *cs) /* 0x40000000..0x40000005, 0x4000000A, 0x40000080..0x40000080 leaves */ int max = 10; int i; + bool do_sys_ioctl; + + do_sys_ioctl = + kvm_check_extension(kvm_state, KVM_CAP_SYS_HYPERV_CPUID) > 0; /* * When the buffer is too small, KVM_GET_SUPPORTED_HV_CPUID fails with * -E2BIG, however, it doesn't report back the right size. Keep increasing * it and re-trying until we succeed. */ - while ((cpuid = try_get_hv_cpuid(cs, max)) == NULL) { + while ((cpuid = try_get_hv_cpuid(cs, max, do_sys_ioctl)) == NULL) { max++; } @@ -980,7 +989,7 @@ static struct kvm_cpuid2 *get_supported_hv_cpuid(CPUState *cs) * information early, just check for the capability and set the bit * manually. */ - if (kvm_check_extension(cs->kvm_state, + if (!do_sys_ioctl && kvm_check_extension(cs->kvm_state, KVM_CAP_HYPERV_ENLIGHTENED_VMCS) > 0) { for (i = 0; i < cpuid->nent; i++) { if (cpuid->entries[i].function == HV_CPUID_ENLIGHTMENT_INFO) {