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Re: [Qemu-discuss] [Qemu-devel] How to configure QEMU to support APIC vi
From: |
Li Qiang |
Subject: |
Re: [Qemu-discuss] [Qemu-devel] How to configure QEMU to support APIC virtualization |
Date: |
Mon, 5 Aug 2019 13:54:36 +0800 |
ddm <address@hidden> 于2019年8月5日周一 下午1:20写道:
> Hi,
>
> As i know, KVM is based on passthrough host cpu to implement
> full-virtualiztion,
> if host cpu doesn't support this feature, it's impossible to turn on this
> feature by KVM.
> Wheher there are another ways in QEMU to emulate this feature,such as
> emulate it based on pure software, not rely on hardware.
>
>
IIUC there is no APICv emulate.
Thanks,
Li Qiang
> Thanks!
>
>
> At 2019-08-05 12:42:55, "Li Qiang" <address@hidden> wrote:
>
>
>
> ddm <address@hidden> 于2019年8月5日周一 上午11:55写道:
>
>> Hi guys,
>>
>>
>> I have tried via modprobe kvmintel enable_apicv=Y to adjust KVM
>> parameter, but it doesn't effect, and
>> cat /sys/module/kvm_intel/parameters/enable_apicv always return "N".
>> I don't know how to configure KVM or QEMU to support APIC virtualizaion
>> feature?
>>
>>
> AFAICT APICv is hardware feature, but I still don't know accurately after
> which CPU support it.
> You may refer the code about 'enable_apicv' related code in kvm to see how
> to detect this capability.
>
> Thanks,
> Li Qiang
>
>
>>
>> My host infos are as follows:
>> Architecture: x86_64
>> CPU op-mode(s): 32-bit, 64-bit
>> Byte Order: Little Endian
>> CPU(s): 1
>> On-line CPU(s) list: 0
>> Thread(s) per core: 1
>> Core(s) per socket: 1
>> Socket(s): 1
>> NUMA node(s): 1
>> Vendor ID: GenuineIntel
>> CPU family: 6
>> Model: 142
>> Model name: Intel(R) Core(TM) i7-8650U CPU @ 1.90GHz
>> Stepping: 10
>> CPU MHz: 2112.001
>> BogoMIPS: 4224.00
>> Virtualization: VT-x
>> Hypervisor vendor: VMware
>> Virtualization type: full
>> L1d cache: 32K
>> L1i cache: 32K
>> L2 cache: 256K
>> L3 cache: 8192K
>> NUMA node0 CPU(s): 0
>> Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr
>> pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx pdpe1gb
>> rdtscp lm constant_tsc arch_perfmon nopl xtopology tsc_reliable nonstop_tsc
>> cpuid pni pclmulqdq vmx ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe
>> popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm
>> 3dnowprefetch cpuid_fault invpcid_single pti ssbd ibrs ibpb stibp
>> tpr_shadow vnmi ept vpid fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2
>> invpcid rtm rdseed adx smap xsaveopt arat flush_l1d arch_capabilities
>>
>>
>> Could you tell me how to configure it?
>>
>>
>> Thanks!
>>
>>
>
>
>