On 09/09/2010 10:33 AM, Jes.Sorensen@xxxxxxxxxx wrote:
From: Jes Sorensen<Jes.Sorensen@xxxxxxxxxx>
Some operating systems store data about the host processor at the
time of installation, and when booted on a more uptodate cpu tries
to read MSR_EBC_FREQUENCY_ID. This has been found with XP.
index f47db25..78fa8a0 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1641,6 +1641,14 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
case MSR_K8_INT_PENDING_MSG:
case MSR_AMD64_NB_CFG:
case MSR_FAM10H_MMIO_CONF_BASE:
+ /*
+ * MSR_EBC_FREQUENCY_ID
+ * Conservative value valid for even the basic CPU models.
+ * Models 0,1: 000 in bits 23:21 indicating a bus speed of
+ * 100MHz, model 2 000 in bits 18:16 indicating 100MHz,
+ * and 266MHz for model 3, or 4.
+ */
+ case MSR_EBC_FREQUENCY_ID:
data = 0;
break;
case MSR_MTRRcap:
From the spec:
31:24 Core Clock Frequency to System
Bus Frequency Ratio. (R)
The processor core clock
frequency to system bus
frequency ratio observed at the
de-assertion of the reset pin.
A frequency ratio of 0 might be unexpected by some guests.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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