From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Joerg Roedel" Subject: [PATCH] SVM: support writing 0 to K8 performance counter control registers Date: Tue, 11 Dec 2007 15:36:57 +0100 Message-ID: <11973838173230-git-send-email-joerg.roedel@amd.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org, Joerg Roedel , Markus Rechberger To: "Avi Kivity" Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org This patch is a slightly improved version of a previously submitted patch. It lets SVM ignore writes of the value 0 to the performance counter control registers. Thus enabling them will still fail in the guest. This is required to boot Windows Vista 64bit. Signed-off-by: Joerg Roedel Signed-off-by: Markus Rechberger --- drivers/kvm/svm.c | 11 +++++++++++ 1 files changed, 11 insertions(+), 0 deletions(-) diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c index 9f8564a..f81b871 100644 --- a/drivers/kvm/svm.c +++ b/drivers/kvm/svm.c @@ -1155,6 +1155,17 @@ 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) + break; default: return kvm_set_msr_common(vcpu, ecx, data); } -- 1.5.2.5 ------------------------------------------------------------------------- SF.Net email is sponsored by: Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php