Hello,
to be honest I'm not sure if this is a bug and if yes, whether this is
kernel or userspace related, please help:
I'm running Vmware ESXi 6.7 on my server and installed a Linux VM
(http://eve-ng.com/index.php/community) on it and I try to run another
vm inside this. I know this is nested virtualization and not the best idea.
Everything is fine, except, that I need for the specific VM the pdpe1gb
feature, so I start it with:
root@eve-ng:~# cat start-vfp.sh
sudo /opt/qemu-2.12.0/bin/qemu-system-x86_64 -drive
if=ide,file=./hda.qcow2 \
--enable-kvm -cpu host,+pdpe1gb,check,enforce \
-m 5120 -numa node,memdev=mem \
-smp 3,sockets=1,cores=3,threads=1 \
-object memory-backend-file,id=mem,size=5120M,mem-path=/hugepages,share=on \
-nographic
root@eve-ng:~# bash start-vfp.sh
WARNING: Image format was not specified for './hda.qcow2' and probing
guessed raw.
Automatically detecting the format is dangerous for raw
images, write operations on block 0 will be restricted.
Specify the 'raw' format explicitly to remove the restrictions.
qemu-system-x86_64: warning: host doesn't support requested feature:
CPUID.80000001H:EDX.pdpe1gb [bit 26]
qemu-system-x86_64: Host doesn't support requested features
so qemu is reporting that pdpe1gb is not supported by my VM, but feature
is in cpuinfo:
root@eve-ng:~# cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 63
model name : Intel(R) Xeon(R) CPU E5-2620 v3 @ 2.40GHz
stepping : 2
microcode : 0x3c
cpu MHz : 2398.122
cache size : 15360 KB
physical id : 0
siblings : 6
core id : 0
cpu cores : 6
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 15
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp
lm constant_tsc arch_perfmon nopl xtopology tsc_reliable nonstop_tsc
eagerfpu 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 tpr_shadow vnmi ept vpid fsgsbase tsc_adjust bmi1 avx2 smep
bmi2 invpcid xsaveopt arat
bugs :
bogomips : 4798.60
clflush size : 64
cache_alignment : 64
address sizes : 43 bits physical, 48 bits virtual
power management:
<<CUT CPU 1-11>
root@eve-ng:~# hugeadm --pool-list
Size Minimum Current Maximum Default
1073741824 32 32 32 *
root@eve-ng:~# cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-4.9.40-eve-ng-ukms-2+
root=/dev/mapper/eve--ng--vg-root ro net.ifnames=0 default_hugepagesz=1G
hugepagesz=1G hugepages=32 intel_iommu=on quiet splash vga=788
From my understanding qemu version 2.12.0 should passthrough the
hugepages, but it doesn't work. Is this a qemu/kvm bug or is it because
of nested virtualization inside vmware? What output do you need?
kind regards
Torben Viets
