From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758216AbYAFOjz (ORCPT ); Sun, 6 Jan 2008 09:39:55 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753831AbYAFOjl (ORCPT ); Sun, 6 Jan 2008 09:39:41 -0500 Received: from il.qumranet.com ([82.166.9.18]:46584 "EHLO il.qumranet.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752973AbYAFOjl (ORCPT ); Sun, 6 Jan 2008 09:39:41 -0500 From: Avi Kivity To: linux-kernel@vger.kernel.org, kvm-devel@lists.sourceforge.net Cc: Joerg Roedel Subject: [PATCH 01/33] KVM: SVM: support writing 0 to K8 performance counter control registers Date: Sun, 6 Jan 2008 16:39:07 +0200 Message-Id: <1199630379-28638-2-git-send-email-avi@qumranet.com> X-Mailer: git-send-email 1.5.3.7 In-Reply-To: <1199630379-28638-1-git-send-email-avi@qumranet.com> References: <1199630379-28638-1-git-send-email-avi@qumranet.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Joerg Roedel This lets SVM ignore writes of the value 0 to the performance counter control registers. Thus enabling them will still fail in the guest, but a write of 0 which keeps them disabled is accepted. This is required to boot Windows Vista 64bit. [avi: avoid fall-thru in switch statement] Signed-off-by: Joerg Roedel Signed-off-by: Markus Rechberger Signed-off-by: Avi Kivity --- drivers/kvm/svm.c | 13 +++++++++++++ 1 files changed, 13 insertions(+), 0 deletions(-) diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c index 9f8564a..839a75f 100644 --- a/drivers/kvm/svm.c +++ b/drivers/kvm/svm.c @@ -1155,7 +1155,20 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 data) case MSR_IA32_SYSENTER_ESP: svm->vmcb->save.sysenter_esp = data; break; + case MSR_K7_EVNTSEL0: + case MSR_K7_EVNTSEL1: + case MSR_K7_EVNTSEL2: + case MSR_K7_EVNTSEL3: + /* + * only support writing 0 to the performance counters for now + * to make Windows happy. Should be replaced by a real + * performance counter emulation later. + */ + if (data != 0) + goto unhandled; + break; default: + unhandled: return kvm_set_msr_common(vcpu, ecx, data); } return 0; -- 1.5.3.7