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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 12:42:55 +0800

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.

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!

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