From patchwork Wed Jun 25 22:12:16 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Andreas_F=C3=A4rber?= X-Patchwork-Id: 364191 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id ACCFF14008C for ; Thu, 26 Jun 2014 08:21:43 +1000 (EST) Received: from localhost ([::1]:41323 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WzvZV-0008EU-TY for incoming@patchwork.ozlabs.org; Wed, 25 Jun 2014 18:21:41 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:48002) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WzvQn-0007PN-Dy for qemu-devel@nongnu.org; Wed, 25 Jun 2014 18:12:47 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WzvQh-0004fU-1L for qemu-devel@nongnu.org; Wed, 25 Jun 2014 18:12:41 -0400 Received: from cantor2.suse.de ([195.135.220.15]:57779 helo=mx2.suse.de) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WzvQg-0004fH-Qo for qemu-devel@nongnu.org; Wed, 25 Jun 2014 18:12:34 -0400 Received: from relay1.suse.de (charybdis-ext.suse.de [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 59668AD71; Wed, 25 Jun 2014 22:12:34 +0000 (UTC) From: =?UTF-8?q?Andreas=20F=C3=A4rber?= To: qemu-devel@nongnu.org Date: Thu, 26 Jun 2014 00:12:16 +0200 Message-Id: <1403734339-14405-17-git-send-email-afaerber@suse.de> X-Mailer: git-send-email 1.8.4.5 In-Reply-To: <1403734339-14405-1-git-send-email-afaerber@suse.de> References: <1403734339-14405-1-git-send-email-afaerber@suse.de> MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x (no timestamps) [generic] X-Received-From: 195.135.220.15 Cc: Paolo Bonzini , Marcelo Tosatti , Eduardo Habkost , "open list:X86" , =?UTF-8?q?Andreas=20F=C3=A4rber?= Subject: [Qemu-devel] [PULL 16/19] target-i386: block migration and savevm if invariant tsc is exposed X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org From: Marcelo Tosatti Invariant TSC documentation mentions that "invariant TSC will run at a constant rate in all ACPI P-, C-. and T-states". This is not the case if migration to a host with different TSC frequency is allowed, or if savevm is performed. So block migration/savevm. Signed-off-by: Marcelo Tosatti Reviewed-by: Eduardo Habkost Signed-off-by: Eduardo Habkost Reviewed-by: Juan Quintela [AF+mtosatti: Updated error message] Signed-off-by: Andreas Färber --- target-i386/cpu-qom.h | 2 +- target-i386/kvm.c | 15 +++++++++++++++ target-i386/machine.c | 2 +- 3 files changed, 17 insertions(+), 2 deletions(-) diff --git a/target-i386/cpu-qom.h b/target-i386/cpu-qom.h index ff3a5de..71a1b97 100644 --- a/target-i386/cpu-qom.h +++ b/target-i386/cpu-qom.h @@ -121,7 +121,7 @@ static inline X86CPU *x86_env_get_cpu(CPUX86State *env) #define ENV_OFFSET offsetof(X86CPU, env) #ifndef CONFIG_USER_ONLY -extern const struct VMStateDescription vmstate_x86_cpu; +extern struct VMStateDescription vmstate_x86_cpu; #endif /** diff --git a/target-i386/kvm.c b/target-i386/kvm.c index 4bf0ac9..097fe11 100644 --- a/target-i386/kvm.c +++ b/target-i386/kvm.c @@ -35,6 +35,8 @@ #include "exec/ioport.h" #include #include "hw/pci/pci.h" +#include "migration/migration.h" +#include "qapi/qmp/qerror.h" //#define DEBUG_KVM @@ -448,6 +450,8 @@ static bool hyperv_enabled(X86CPU *cpu) cpu->hyperv_relaxed_timing); } +static Error *invtsc_mig_blocker; + #define KVM_MAX_CPUID_ENTRIES 100 int kvm_arch_init_vcpu(CPUState *cs) @@ -705,6 +709,17 @@ int kvm_arch_init_vcpu(CPUState *cs) !!(c->ecx & CPUID_EXT_SMX); } + c = cpuid_find_entry(&cpuid_data.cpuid, 0x80000007, 0); + if (c && (c->edx & 1<<8) && invtsc_mig_blocker == NULL) { + /* for migration */ + error_setg(&invtsc_mig_blocker, + "State blocked by non-migratable CPU device" + " (invtsc flag)"); + migrate_add_blocker(invtsc_mig_blocker); + /* for savevm */ + vmstate_x86_cpu.unmigratable = 1; + } + cpuid_data.cpuid.padding = 0; r = kvm_vcpu_ioctl(cs, KVM_SET_CPUID2, &cpuid_data); if (r) { diff --git a/target-i386/machine.c b/target-i386/machine.c index b8dcd2f..16d2f6a 100644 --- a/target-i386/machine.c +++ b/target-i386/machine.c @@ -603,7 +603,7 @@ static const VMStateDescription vmstate_msr_hyperv_time = { } }; -const VMStateDescription vmstate_x86_cpu = { +VMStateDescription vmstate_x86_cpu = { .name = "cpu", .version_id = 12, .minimum_version_id = 3,