From patchwork Fri Jan 4 22:01:03 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eduardo Habkost X-Patchwork-Id: 1935311 Return-Path: X-Original-To: patchwork-kvm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id 07D6940AF6 for ; Fri, 4 Jan 2013 23:55:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755361Ab3ADXzO (ORCPT ); Fri, 4 Jan 2013 18:55:14 -0500 Received: from mx1.redhat.com ([209.132.183.28]:26564 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755254Ab3ADXzJ (ORCPT ); Fri, 4 Jan 2013 18:55:09 -0500 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id r04LxeoD032299 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Fri, 4 Jan 2013 16:59:40 -0500 Received: from blackpad.lan.raisama.net (vpn1-7-13.gru2.redhat.com [10.97.7.13]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id r04LxYhq016784; Fri, 4 Jan 2013 16:59:35 -0500 Received: by blackpad.lan.raisama.net (Postfix, from userid 500) id D5E2C203D0F; Fri, 4 Jan 2013 20:01:13 -0200 (BRST) From: Eduardo Habkost To: qemu-devel@nongnu.org Cc: libvir-list@redhat.com, kvm@vger.kernel.org, =?UTF-8?q?Andreas=20F=C3=A4rber?= , Igor Mammedov , "Michael S. Tsirkin" , Gleb Natapov , Marcelo Tosatti , Jiri Denemark Subject: [PATCH qom-cpu 02/11] target-i386: Disable kvm_mmu_op by default on pc-1.4 Date: Fri, 4 Jan 2013 20:01:03 -0200 Message-Id: <1357336872-7200-3-git-send-email-ehabkost@redhat.com> In-Reply-To: <1357336872-7200-1-git-send-email-ehabkost@redhat.com> References: <1357336872-7200-1-git-send-email-ehabkost@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.23 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org The kvm_mmu_op feature was removed from the kernel since v3.3 (released in March 2012), it was marked for removal since January 2011 and it's slower than shadow or hardware assisted paging (see kernel commit fb92045843). It doesn't make sense to keep it enabled by default. Also, keeping it enabled by default would cause unnecessary hassle when libvirt start using the "enforce" option. Signed-off-by: Eduardo Habkost --- Cc: kvm@vger.kernel.org Cc: Michael S. Tsirkin Cc: Gleb Natapov Cc: Marcelo Tosatti Cc: libvir-list@redhat.com Cc: Jiri Denemark I was planning to reverse the logic of the compat init functions and make pc_init_pci_1_3() enable kvm_mmu_op and then call pc_init_pci_1_4() instead. But that would require changing pc_init_pci_no_kvmclock() and pc_init_isa() as well. So to keep the changes simple, I am keeping the pattern used when pc_init_pci_1_3() was introduced, making pc_init_pci_1_4() disable kvm_mmu_op and then call pc_init_pci_1_3(). Changes v2: - Coding style fix - Removed redundant comments above machine init functions --- hw/pc_piix.c | 9 ++++++++- target-i386/cpu.c | 9 +++++++++ target-i386/cpu.h | 1 + 3 files changed, 18 insertions(+), 1 deletion(-) diff --git a/hw/pc_piix.c b/hw/pc_piix.c index 99747a7..a32af6a 100644 --- a/hw/pc_piix.c +++ b/hw/pc_piix.c @@ -217,6 +217,7 @@ static void pc_init1(MemoryRegion *system_memory, } } +/* machine init function for pc-0.14 - pc-1.2 */ static void pc_init_pci(QEMUMachineInitArgs *args) { ram_addr_t ram_size = args->ram_size; @@ -238,6 +239,12 @@ static void pc_init_pci_1_3(QEMUMachineInitArgs *args) pc_init_pci(args); } +static void pc_init_pci_1_4(QEMUMachineInitArgs *args) +{ + disable_kvm_mmu_op(); + pc_init_pci_1_3(args); +} + static void pc_init_pci_no_kvmclock(QEMUMachineInitArgs *args) { ram_addr_t ram_size = args->ram_size; @@ -285,7 +292,7 @@ static QEMUMachine pc_machine_v1_4 = { .name = "pc-1.4", .alias = "pc", .desc = "Standard PC", - .init = pc_init_pci_1_3, + .init = pc_init_pci_1_4, .max_cpus = 255, .is_default = 1, }; diff --git a/target-i386/cpu.c b/target-i386/cpu.c index e6435da..c83a566 100644 --- a/target-i386/cpu.c +++ b/target-i386/cpu.c @@ -158,6 +158,15 @@ void enable_kvm_pv_eoi(void) #endif } +void disable_kvm_mmu_op(void) +{ +#ifdef CONFIG_KVM + if (kvm_enabled()) { + kvm_default_features &= ~(1UL << KVM_FEATURE_MMU_OP); + } +#endif +} + void host_cpuid(uint32_t function, uint32_t count, uint32_t *eax, uint32_t *ebx, uint32_t *ecx, uint32_t *edx) { diff --git a/target-i386/cpu.h b/target-i386/cpu.h index 1283537..27c8d0c 100644 --- a/target-i386/cpu.h +++ b/target-i386/cpu.h @@ -1219,5 +1219,6 @@ void do_smm_enter(CPUX86State *env1); void cpu_report_tpr_access(CPUX86State *env, TPRAccess access); void enable_kvm_pv_eoi(void); +void disable_kvm_mmu_op(void); #endif /* CPU_I386_H */