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Thu, 17 Sep 2020 07:13:20 -0400 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-371-VkaTea-mN-SYo-MqOVhf_w-1; Thu, 17 Sep 2020 07:13:12 -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 mimecast-mx01.redhat.com (Postfix) with ESMTPS id 34635186DD27; Thu, 17 Sep 2020 11:13:11 +0000 (UTC) Received: from vitty.brq.redhat.com (unknown [10.40.195.92]) by smtp.corp.redhat.com (Postfix) with ESMTP id 76DE275132; Thu, 17 Sep 2020 11:13:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1600341196; 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; bh=pplzKFZUoIjGfxypuC03DYnXPnAd5yOOVhb45BPdp2s=; b=LOhpAJkQFDwSxfpq+aArvwG0ly/rCWp6Q6cWdsW6SBZlsq0KgghnTzZL/TR3roHG86oBVP F/XvISCGYoRFamign+uQVnRTy/O+54YX92LW2kzIiKn+AIPGJHtoybLzY+RMYxg6Up/0L3 7WW7L4IOt6nztCyDS3tMv5Pkjz3SlIk= X-MC-Unique: VkaTea-mN-SYo-MqOVhf_w-1 From: Vitaly Kuznetsov To: qemu-devel@nongnu.org Subject: [PATCH] target/i386: always create kvmclock device Date: Thu, 17 Sep 2020 13:13:06 +0200 Message-Id: <20200917111306.819263-1-vkuznets@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=vkuznets@redhat.com X-Mimecast-Spam-Score: 0.001 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=216.205.24.124; envelope-from=vkuznets@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/17 02:01:40 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -50 X-Spam_score: -5.1 X-Spam_bar: ----- X-Spam_report: (-5.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-2.997, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=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: Antoine Damhet , Paolo Bonzini , Marcelo Tosatti , Eduardo Habkost , "Dr. David Alan Gilbert" Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" QEMU's kvmclock device is only created when KVM PV feature bits for kvmclock (KVM_FEATURE_CLOCKSOURCE/KVM_FEATURE_CLOCKSOURCE2) are exposed to the guest. With 'kvm=3Doff' cpu flag the device is not created and we don't call KVM_GET_CLOCK/KVM_SET_CLOCK upon migration. It was reported that without these call at least Hyper-V TSC page clocksouce (which can be enabled independently) gets broken after migration. Switch to creating kvmclock QEMU device unconditionally, it seems to always make sense to call KVM_GET_CLOCK/KVM_SET_CLOCK on migration. Use KVM_CAP_ADJUST_CLOCK check instead of CPUID feature bits. Reported-by: Antoine Damhet Suggested-by: Paolo Bonzini Signed-off-by: Vitaly Kuznetsov --- hw/i386/kvm/clock.c | 6 +----- target/i386/kvm.c | 5 +++++ target/i386/kvm_i386.h | 1 + 3 files changed, 7 insertions(+), 5 deletions(-) diff --git a/hw/i386/kvm/clock.c b/hw/i386/kvm/clock.c index 64283358f91d..526c9ea5172b 100644 --- a/hw/i386/kvm/clock.c +++ b/hw/i386/kvm/clock.c @@ -330,11 +330,7 @@ static const TypeInfo kvmclock_info =3D { /* Note: Must be called after VCPU initialization. */ void kvmclock_create(void) { - X86CPU *cpu =3D X86_CPU(first_cpu); - - if (kvm_enabled() && - cpu->env.features[FEAT_KVM] & ((1ULL << KVM_FEATURE_CLOCKSOURCE) | - (1ULL << KVM_FEATURE_CLOCKSOURCE2))= ) { + if (kvm_enabled() && kvm_has_adjust_clock()) { sysbus_create_simple(TYPE_KVM_CLOCK, -1, NULL); } } diff --git a/target/i386/kvm.c b/target/i386/kvm.c index 4a8b3a41c1bc..20b31b65307b 100644 --- a/target/i386/kvm.c +++ b/target/i386/kvm.c @@ -143,6 +143,11 @@ bool kvm_has_adjust_clock_stable(void) return (ret =3D=3D KVM_CLOCK_TSC_STABLE); } =20 +bool kvm_has_adjust_clock(void) +{ + return kvm_check_extension(kvm_state, KVM_CAP_ADJUST_CLOCK); +} + bool kvm_has_exception_payload(void) { return has_exception_payload; diff --git a/target/i386/kvm_i386.h b/target/i386/kvm_i386.h index 064b8798a26c..0fce4e51d2d6 100644 --- a/target/i386/kvm_i386.h +++ b/target/i386/kvm_i386.h @@ -34,6 +34,7 @@ =20 bool kvm_allows_irq0_override(void); bool kvm_has_smm(void); +bool kvm_has_adjust_clock(void); bool kvm_has_adjust_clock_stable(void); bool kvm_has_exception_payload(void); void kvm_synchronize_all_tsc(void); --=20 2.25.4