From patchwork Tue Sep 22 15:19:34 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vitaly Kuznetsov X-Patchwork-Id: 11792735 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B6F93139F for ; Tue, 22 Sep 2020 15:22:12 +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 3197723A1B for ; Tue, 22 Sep 2020 15:22:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="LUDapqRg" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3197723A1B 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+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:48674 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kKk7N-00028f-Bx for patchwork-qemu-devel@patchwork.kernel.org; Tue, 22 Sep 2020 11:22:09 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:34826) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kKk53-0000jt-MZ for qemu-devel@nongnu.org; Tue, 22 Sep 2020 11:19:47 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:30572) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kKk50-0006XD-GQ for qemu-devel@nongnu.org; Tue, 22 Sep 2020 11:19:45 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1600787981; 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=hxahp7jlcV8KWl44LwjwrRaKzzX7zcc0K4C9kwUJ3qI=; b=LUDapqRgZkAVAEYQUCQHOBzu5BcQMWxq29IE+CgSZFY9LZghMZFD0UQblQBLojlrZUuSvd sjyZRoNLi2yEUOl5fsuOul54cikfCch+mn6kX+APPkP7DxVGcszyFrsqtvJGX7Gx7/wNft UN1uS/xrvNwD+mO4cTu7cHluxfib04I= 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-9-laZ-QeasMrq61p0yVjdIiQ-1; Tue, 22 Sep 2020 11:19:39 -0400 X-MC-Unique: laZ-QeasMrq61p0yVjdIiQ-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id ED9C71018721; Tue, 22 Sep 2020 15:19:37 +0000 (UTC) Received: from vitty.brq.redhat.com (unknown [10.40.193.59]) by smtp.corp.redhat.com (Postfix) with ESMTP id 19E6D60C05; Tue, 22 Sep 2020 15:19:35 +0000 (UTC) From: Vitaly Kuznetsov To: qemu-devel@nongnu.org Subject: [PATCH v2] target/i386: always create kvmclock device Date: Tue, 22 Sep 2020 17:19:34 +0200 Message-Id: <20200922151934.899555-1-vkuznets@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 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-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/22 00:31:51 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -35 X-Spam_score: -3.6 X-Spam_bar: --- X-Spam_report: (-3.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.455, 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+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" 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=off' 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 Tested-by: Antoine Damhet --- hw/i386/kvm/clock.c | 7 +++++-- hw/i386/microvm.c | 2 +- hw/i386/pc.c | 1 + hw/i386/pc_piix.c | 7 +++++-- hw/i386/pc_q35.c | 5 ++++- include/hw/i386/pc.h | 3 +++ include/hw/kvm/clock.h | 4 ++-- target/i386/kvm.c | 5 +++++ target/i386/kvm_i386.h | 1 + 9 files changed, 27 insertions(+), 8 deletions(-) diff --git a/hw/i386/kvm/clock.c b/hw/i386/kvm/clock.c index 64283358f91d..30cf53393ee1 100644 --- a/hw/i386/kvm/clock.c +++ b/hw/i386/kvm/clock.c @@ -328,11 +328,14 @@ static const TypeInfo kvmclock_info = { }; /* Note: Must be called after VCPU initialization. */ -void kvmclock_create(void) +void kvmclock_create(bool create_always) { X86CPU *cpu = X86_CPU(first_cpu); - if (kvm_enabled() && + if (!kvm_enabled() || !kvm_has_adjust_clock()) + return; + + if (create_always || cpu->env.features[FEAT_KVM] & ((1ULL << KVM_FEATURE_CLOCKSOURCE) | (1ULL << KVM_FEATURE_CLOCKSOURCE2))) { sysbus_create_simple(TYPE_KVM_CLOCK, -1, NULL); diff --git a/hw/i386/microvm.c b/hw/i386/microvm.c index 81d0888930d1..fd0b84109154 100644 --- a/hw/i386/microvm.c +++ b/hw/i386/microvm.c @@ -119,7 +119,7 @@ static void microvm_devices_init(MicrovmMachineState *mms) ioapic_init_gsi(gsi_state, "machine"); - kvmclock_create(); + kvmclock_create(true); for (i = 0; i < VIRTIO_NUM_TRANSPORTS; i++) { sysbus_create_simple("virtio-mmio", diff --git a/hw/i386/pc.c b/hw/i386/pc.c index d11daacc23cf..0e036ef9c15f 100644 --- a/hw/i386/pc.c +++ b/hw/i386/pc.c @@ -1956,6 +1956,7 @@ static void pc_machine_class_init(ObjectClass *oc, void *data) pcmc->acpi_data_size = 0x20000 + 0x8000; pcmc->linuxboot_dma_enabled = true; pcmc->pvh_enabled = true; + pcmc->kvmclock_create_always = true; assert(!mc->get_hotplug_handler); mc->get_hotplug_handler = pc_get_hotplug_handler; mc->hotplug_allowed = pc_hotplug_allowed; diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c index 32b1453e6a82..1a68338c737b 100644 --- a/hw/i386/pc_piix.c +++ b/hw/i386/pc_piix.c @@ -158,8 +158,8 @@ static void pc_init1(MachineState *machine, x86_cpus_init(x86ms, pcmc->default_cpu_version); - if (kvm_enabled() && pcmc->kvmclock_enabled) { - kvmclock_create(); + if (pcmc->kvmclock_enabled) { + kvmclock_create(pcmc->kvmclock_create_always); } if (pcmc->pci_enabled) { @@ -440,11 +440,14 @@ DEFINE_I440FX_MACHINE(v5_2, "pc-i440fx-5.2", NULL, static void pc_i440fx_5_1_machine_options(MachineClass *m) { + PCMachineClass *pcmc = PC_MACHINE_CLASS(m); + pc_i440fx_5_2_machine_options(m); m->alias = NULL; m->is_default = false; compat_props_add(m->compat_props, hw_compat_5_1, hw_compat_5_1_len); compat_props_add(m->compat_props, pc_compat_5_1, pc_compat_5_1_len); + pcmc->kvmclock_create_always = false; } DEFINE_I440FX_MACHINE(v5_1, "pc-i440fx-5.1", NULL, diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c index 0cb9c18cd44d..0dd59bd765b1 100644 --- a/hw/i386/pc_q35.c +++ b/hw/i386/pc_q35.c @@ -185,7 +185,7 @@ static void pc_q35_init(MachineState *machine) x86_cpus_init(x86ms, pcmc->default_cpu_version); - kvmclock_create(); + kvmclock_create(pcmc->kvmclock_create_always); /* pci enabled */ if (pcmc->pci_enabled) { @@ -366,10 +366,13 @@ DEFINE_Q35_MACHINE(v5_2, "pc-q35-5.2", NULL, static void pc_q35_5_1_machine_options(MachineClass *m) { + PCMachineClass *pcmc = PC_MACHINE_CLASS(m); + pc_q35_5_2_machine_options(m); m->alias = NULL; compat_props_add(m->compat_props, hw_compat_5_1, hw_compat_5_1_len); compat_props_add(m->compat_props, pc_compat_5_1, pc_compat_5_1_len); + pcmc->kvmclock_create_always = false; } DEFINE_Q35_MACHINE(v5_1, "pc-q35-5.1", NULL, diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h index fe52e165b27c..6b22671434b9 100644 --- a/include/hw/i386/pc.h +++ b/include/hw/i386/pc.h @@ -118,6 +118,9 @@ typedef struct PCMachineClass { /* use PVH to load kernels that support this feature */ bool pvh_enabled; + + /* create kvmclock device even when KVM PV features are not exposed */ + bool kvmclock_create_always; } PCMachineClass; #define TYPE_PC_MACHINE "generic-pc-machine" diff --git a/include/hw/kvm/clock.h b/include/hw/kvm/clock.h index 81c66b230207..7994071c4fee 100644 --- a/include/hw/kvm/clock.h +++ b/include/hw/kvm/clock.h @@ -15,11 +15,11 @@ #ifdef CONFIG_KVM -void kvmclock_create(void); +void kvmclock_create(bool create_always); #else /* CONFIG_KVM */ -static inline void kvmclock_create(void) +static inline void kvmclock_create(bool create_always) { } 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 == KVM_CLOCK_TSC_STABLE); } +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 @@ 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);