TJ wrote:
Trying to run the latest OLPC XO guest image with kvm-intel on 2.6.22 x86_64 (Ubuntu Gutsy) on a T7200 there are critical problems which don't occur if kvm-intel is not loaded/used.The same issue affects kvm-48, kvm-50 and kvm-51. I don't see these problems with Gutsy or Windows guests. The issues are: 1. Start-up of the image into GRUB is _slow_. The cursor can be seen scanning as the GRUB menu is drawn. It is *much* faster when kvm-intel isn't loaded/used. 2. After choosing a boot option the guest freezes and the host kern.log reports: kernel: [88380.014893] kvm: 12666: cpu0 unhandled rdmsr: 0x1900 kernel: [88380.014900] inject_general_protection: rip 0xc07211ab 3. Guest locks up at this point with host CPU being driven 100% and requires killing. I'm guessing they may be related to the OLPC kernel expecting an AMD Geode CPU? ./include/asm-i386/msr.h #define MSR_GEODE_BUSCONT_CONF0 0x1900
Very likely. Try the attached patch. The guest may hang later with another bad msr; you can simply add more registers as necessary.
I think we can add an API to do this from userspace, to avoid the need to patch the kernel for hundreds of no-op msrs.
-- error compiling committee.c: too many arguments to function
diff --git a/kernel/x86.c b/kernel/x86.c index e905d46..71307cb 100644 --- a/kernel/x86.c +++ b/kernel/x86.c @@ -460,6 +460,7 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) case MSR_IA32_UCODE_REV: case MSR_IA32_PERF_STATUS: case MSR_IA32_EBL_CR_POWERON: + case MSR_GEODE_BUSCONT_CONF0: /* MTRR registers */ case 0xfe: case 0x200 ... 0x2ff:
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