From mboxrd@z Thu Jan 1 00:00:00 1970 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=-8.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT 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 488D6C31E46 for ; Wed, 12 Jun 2019 08:48:39 +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 EB640206E0 for ; Wed, 12 Jun 2019 08:48:38 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EB640206E0 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:57628 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hayvq-0005Px-3T for qemu-devel@archiver.kernel.org; Wed, 12 Jun 2019 04:48:35 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:57729) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hayrm-00038R-UM for qemu-devel@nongnu.org; Wed, 12 Jun 2019 04:44:25 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hayrk-0006G1-24 for qemu-devel@nongnu.org; Wed, 12 Jun 2019 04:44:22 -0400 Received: from mga11.intel.com ([192.55.52.93]:10704) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hayrj-0005vT-MS for qemu-devel@nongnu.org; Wed, 12 Jun 2019 04:44:19 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga102.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 12 Jun 2019 01:43:34 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.63,363,1557212400"; d="scan'208";a="184175091" Received: from likexu-e5-2699-v4.sh.intel.com ([10.239.48.178]) by fmsmga002.fm.intel.com with ESMTP; 12 Jun 2019 01:43:33 -0700 From: Like Xu To: qemu-devel@nongnu.org, Eduardo Habkost Date: Wed, 12 Jun 2019 16:41:02 +0800 Message-Id: <20190612084104.34984-8-like.xu@linux.intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190612084104.34984-1-like.xu@linux.intel.com> References: <20190612084104.34984-1-like.xu@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 192.55.52.93 Subject: [Qemu-devel] [PATCH v3 7/9] target/i386: Support multi-dies when host doesn't support CPUID.1F 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 , "Dr . David Alan Gilbert" , like.xu@linux.intel.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" In guest CPUID generation process, the cpuid_min_level would be adjusted to the maximum passed value for basic CPUID configuration and it should not be restricted by the limited value returned from cpu_x86_cpuid(). After the basic cpu_x86_cpuid() loop is finished, the cpuid_0_entry.eax needs to be configured again by the last adjusted cpuid_min_level value. If a user wants to expose CPUID.1F by passing dies > 1 for any reason without host support, a per-cpu smp topology warning will appear but it's not blocked. Signed-off-by: Like Xu --- target/i386/kvm.c | 24 ++++++++++++++++++++++-- 1 file changed, 22 insertions(+), 2 deletions(-) diff --git a/target/i386/kvm.c b/target/i386/kvm.c index 9b4da9b265..8bf1604d2b 100644 --- a/target/i386/kvm.c +++ b/target/i386/kvm.c @@ -931,12 +931,12 @@ int kvm_arch_init_vcpu(CPUState *cs) struct kvm_cpuid_entry2 *c; uint32_t signature[3]; int kvm_base = KVM_CPUID_SIGNATURE; - int r; + int r, cpuid_0_entry, cpuid_min_level; Error *local_err = NULL; memset(&cpuid_data, 0, sizeof(cpuid_data)); - cpuid_i = 0; + cpuid_i = cpuid_0_entry = cpuid_min_level = 0; r = kvm_arch_set_tsc_khz(cs); if (r < 0) { @@ -1050,6 +1050,12 @@ int kvm_arch_init_vcpu(CPUState *cs) cpu_x86_cpuid(env, 0, 0, &limit, &unused, &unused, &unused); + /* Allow 0x1f setting regardless of kvm support if nr_dies > 1 */ + if (limit < 0x1f && env->nr_dies > 1 && cpu->enable_cpuid_0x1f) { + limit = env->cpuid_level = env->cpuid_min_level = 0x1f; + warn_report("CPU topology: the CPUID.1F isn't supported on the host."); + } + for (i = 0; i <= limit; i++) { if (cpuid_i == KVM_MAX_CPUID_ENTRIES) { fprintf(stderr, "unsupported level value: 0x%x\n", limit); @@ -1151,8 +1157,22 @@ int kvm_arch_init_vcpu(CPUState *cs) cpu_x86_cpuid(env, i, 0, &c->eax, &c->ebx, &c->ecx, &c->edx); break; } + + /* Remember the index of cpuid.0 leaf for reconfiguration. */ + cpuid_0_entry = (i == 0) ? (cpuid_i - 1) : cpuid_0_entry; + + /* Adjust cpuid_min_level to the maximum index of valid basic cpuids. */ + cpuid_min_level = + ((c->eax | c->ebx | c->ecx | c->edx | c->flags | c->index) && + (i > cpuid_min_level)) ? i : cpuid_min_level; } + env->cpuid_level = env->cpuid_min_level = cpuid_min_level; + + /* Reconfigure cpuid_0_eax value to follow CPUID.0 instruction spec.*/ + c = &cpuid_data.entries[cpuid_0_entry]; + cpu_x86_cpuid(env, 0, 0, &c->eax, &c->ebx, &c->ecx, &c->edx); + if (limit >= 0x0a) { uint32_t eax, edx; -- 2.21.0