From patchwork Mon Oct 22 16:55:06 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vitaly Kuznetsov X-Patchwork-Id: 10652255 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 50EF813BF for ; Mon, 22 Oct 2018 16:57:00 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 766E72906C for ; Mon, 22 Oct 2018 16:56:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6ABC829072; Mon, 22 Oct 2018 16:56:59 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id F3F7F2906C for ; Mon, 22 Oct 2018 16:56:58 +0000 (UTC) Received: from localhost ([::1]:36269 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gEdVi-0006EF-6e for patchwork-qemu-devel@patchwork.kernel.org; Mon, 22 Oct 2018 12:56:58 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:40549) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gEdUP-0005IN-Kk for qemu-devel@nongnu.org; Mon, 22 Oct 2018 12:55:38 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gEdUI-0005VM-VV for qemu-devel@nongnu.org; Mon, 22 Oct 2018 12:55:35 -0400 Received: from mx1.redhat.com ([209.132.183.28]:40466) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gEdUG-0005Na-3X for qemu-devel@nongnu.org; Mon, 22 Oct 2018 12:55:29 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 27D113097081; Mon, 22 Oct 2018 16:55:20 +0000 (UTC) Received: from vitty.brq.redhat.com.redhat.com (ovpn-204-152.brq.redhat.com [10.40.204.152]) by smtp.corp.redhat.com (Postfix) with ESMTP id 64A3A5D6A9; Mon, 22 Oct 2018 16:55:17 +0000 (UTC) From: Vitaly Kuznetsov To: qemu-devel@nongnu.org Date: Mon, 22 Oct 2018 18:55:06 +0200 Message-Id: <20181022165506.30332-3-vkuznets@redhat.com> In-Reply-To: <20181022165506.30332-1-vkuznets@redhat.com> References: <20181022165506.30332-1-vkuznets@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.43]); Mon, 22 Oct 2018 16:55:20 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v2 2/2] x86: hv_evmcs CPU flag support X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paolo Bonzini , Marcelo Tosatti , Roman Kagan , Eduardo Habkost , Richard Henderson Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP Adds a new CPU flag to enable the Enlightened VMCS KVM feature. QEMU enables KVM_CAP_HYPERV_ENLIGHTENED_VMCS and gets back the version to be advertised in lower 16 bits of CPUID.0x4000000A:EAX. Suggested-by: Ladi Prosek Signed-off-by: Vitaly Kuznetsov Reviewed-by: Roman Kagan --- Changes since v1: - Throw away HV_CPUID_MIN_NESTED. - Create zeroed 0x40000006-0x40000009 CPUID leaves. --- target/i386/cpu.c | 1 + target/i386/cpu.h | 1 + target/i386/hyperv-proto.h | 2 ++ target/i386/kvm.c | 30 ++++++++++++++++++++++++++++-- 4 files changed, 32 insertions(+), 2 deletions(-) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index c88876dfe3..5c0e84fb99 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -5564,6 +5564,7 @@ static Property x86_cpu_properties[] = { DEFINE_PROP_BOOL("hv-frequencies", X86CPU, hyperv_frequencies, false), DEFINE_PROP_BOOL("hv-reenlightenment", X86CPU, hyperv_reenlightenment, false), DEFINE_PROP_BOOL("hv-tlbflush", X86CPU, hyperv_tlbflush, false), + DEFINE_PROP_BOOL("hv-evmcs", X86CPU, hyperv_evmcs, false), DEFINE_PROP_BOOL("check", X86CPU, check_cpuid, true), DEFINE_PROP_BOOL("enforce", X86CPU, enforce_cpuid, false), DEFINE_PROP_BOOL("kvm", X86CPU, expose_kvm, true), diff --git a/target/i386/cpu.h b/target/i386/cpu.h index 730c06f80a..013d953b57 100644 --- a/target/i386/cpu.h +++ b/target/i386/cpu.h @@ -1382,6 +1382,7 @@ struct X86CPU { bool hyperv_frequencies; bool hyperv_reenlightenment; bool hyperv_tlbflush; + bool hyperv_evmcs; bool check_cpuid; bool enforce_cpuid; bool expose_kvm; diff --git a/target/i386/hyperv-proto.h b/target/i386/hyperv-proto.h index d6d5a79293..1e6800ba43 100644 --- a/target/i386/hyperv-proto.h +++ b/target/i386/hyperv-proto.h @@ -18,6 +18,7 @@ #define HV_CPUID_FEATURES 0x40000003 #define HV_CPUID_ENLIGHTMENT_INFO 0x40000004 #define HV_CPUID_IMPLEMENT_LIMITS 0x40000005 +#define HV_CPUID_NESTED_FEATURES 0x4000000A #define HV_CPUID_MIN 0x40000005 #define HV_CPUID_MAX 0x4000ffff #define HV_HYPERVISOR_PRESENT_BIT 0x80000000 @@ -59,6 +60,7 @@ #define HV_SYSTEM_RESET_RECOMMENDED (1u << 4) #define HV_RELAXED_TIMING_RECOMMENDED (1u << 5) #define HV_EX_PROCESSOR_MASKS_RECOMMENDED (1u << 11) +#define HV_ENLIGHTENED_VMCS_RECOMMENDED (1u << 14) /* * Basic virtualized MSRs diff --git a/target/i386/kvm.c b/target/i386/kvm.c index a46ad102d8..6f10abcf6f 100644 --- a/target/i386/kvm.c +++ b/target/i386/kvm.c @@ -798,6 +798,7 @@ int kvm_arch_init_vcpu(CPUState *cs) uint32_t unused; struct kvm_cpuid_entry2 *c; uint32_t signature[3]; + uint16_t evmcs_version; int kvm_base = KVM_CPUID_SIGNATURE; int r; Error *local_err = NULL; @@ -841,7 +842,8 @@ int kvm_arch_init_vcpu(CPUState *cs) memset(signature, 0, 12); memcpy(signature, cpu->hyperv_vendor_id, len); } - c->eax = HV_CPUID_MIN; + c->eax = cpu->hyperv_evmcs ? + HV_CPUID_NESTED_FEATURES : HV_CPUID_IMPLEMENT_LIMITS; c->ebx = signature[0]; c->ecx = signature[1]; c->edx = signature[2]; @@ -888,7 +890,16 @@ int kvm_arch_init_vcpu(CPUState *cs) c->eax |= HV_REMOTE_TLB_FLUSH_RECOMMENDED; c->eax |= HV_EX_PROCESSOR_MASKS_RECOMMENDED; } - + if (cpu->hyperv_evmcs) { + if (kvm_vcpu_enable_cap(cs, KVM_CAP_HYPERV_ENLIGHTENED_VMCS, 0, + (uintptr_t)&evmcs_version)) { + fprintf(stderr, "Hyper-V Enlightened VMCS " + "(requested by 'hv-evmcs' cpu flag) " + "is not supported by kernel\n"); + return -ENOSYS; + } + c->eax |= HV_ENLIGHTENED_VMCS_RECOMMENDED; + } c->ebx = cpu->hyperv_spinlock_attempts; c = &cpuid_data.entries[cpuid_i++]; @@ -899,6 +910,21 @@ int kvm_arch_init_vcpu(CPUState *cs) kvm_base = KVM_CPUID_SIGNATURE_NEXT; has_msr_hv_hypercall = true; + + if (cpu->hyperv_evmcs) { + __u32 function; + + /* Create zeroed 0x40000006..0x40000009 leaves */ + for (function = HV_CPUID_IMPLEMENT_LIMITS + 1; + function < HV_CPUID_NESTED_FEATURES; function++) { + c = &cpuid_data.entries[cpuid_i++]; + c->function = function; + } + + c = &cpuid_data.entries[cpuid_i++]; + c->function = HV_CPUID_NESTED_FEATURES; + c->eax = evmcs_version; + } } if (cpu->expose_kvm) {