[Qemu-devel] [Bug 1248959] [NEW] pdpe1gb flag is missing in guest running on Intel h/w

[Vladimir Zinovjevs]

Public bug reported:

I need to utilize 1G hugepages on my guest system. But this is not
possible as long as there is no pdpe1gb support in guest system.  The
latest source code contains pdpe1gb  support for AMD but not for Intel.

Are there any obstacles that does not allow to implement it for modern
Intel chips?

My configuration:
Host:
-------
uname -a
Linux tripel.salab.cic.nsn-rdnet.net 2.6.32-358.14.1.el6.x86_64 #1 SMP Tue Jul 
16 23:51:20 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

cat /etc/*-release
CentOS release 6.4 (Final)

yum list installed | grep qemu
gpxe-roms-qemu.noarch                0.9.7-6.9.el6             @base
qemu-img.x86_64                      2:0.12.1.2-2.355.0.1.el6.centos.5
qemu-kvm.x86_64                      2:0.12.1.2-2.355.0.1.el6.centos.5

cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 45
model name      : Intel(R) Xeon(R) CPU E5-2680 0 @ 2.70GHz
stepping        : 7
cpu MHz         : 2700.000
cache size      : 20480 KB
physical id     : 0
siblings        : 16
core id         : 0
cpu cores       : 8
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 13
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov 
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb 
rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc 
aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr 
pdcm pcid dca sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx 
lahf_lm ida arat epb xsaveopt pln pts dts tpr_shadow vnmi flexpriority ept vpid
bogomips        : 5387.09
clflush size    : 64
cache_alignment : 64
address sizes   : 46 bits physical, 48 bits virtual

/usr/libexec/qemu-kvm -cpu ?
Recognized CPUID flags:
  f_edx: pbe ia64 tm ht ss sse2 sse fxsr mmx acpi ds clflush pn pse36 pat cmov 
mca pge mtrr sep apic cx8 mce pae msr tsc pse de vme fpu
  f_ecx: hypervisor rdrand f16c avx osxsave xsave aes tsc-deadline popcnt movbe 
x2apic sse4.2|sse4_2 sse4.1|sse4_1 dca pcid pdcm xtpr cx16 fma cid ssse3 tm2 
est smx vmx ds_cpl monitor dtes64 pclmulqdq|pclmuldq pni|sse3
  extf_edx: 3dnow 3dnowext lm|i64 rdtscp pdpe1gb fxsr_opt|ffxsr fxsr mmx mmxext 
nx|xd pse36 pat cmov mca pge mtrr syscall apic cx8 mce pae msr tsc pse de vme 
fpu
  extf_ecx: perfctr_nb perfctr_core topoext tbm nodeid_msr tce fma4 lwp wdt 
skinit xop ibs osvw 3dnowprefetch misalignsse sse4a abm cr8legacy extapic svm 
cmp_legacy lahf_lm

ps ax | grep qemu
 7197 ?        Sl     0:15 /usr/libexec/qemu-kvm -name vladimir.AS-0 -S -M 
rhel6.4.0 -cpu 
SandyBridge,+pdpe1gb,+osxsave,+dca,+pcid,+pdcm,+xtpr,+tm2,+est,+smx,+vmx,+ds_cpl,+monitor,+dtes64,+pbe,+tm,+ht,+ss,+acpi,+ds,+vme
 -enable-kvm -m 8192 -mem-prealloc -mem-path 
/var/lib/hugetlbfs/pagesize-1GB/libvirt/qemu -smp 4,sockets=4,cores=1,threads=1 
-uuid ec2d3c58-a7f0-fdbd-9de5-b547a5b3130f -nographic -nodefconfig -nodefaults 
-chardev 
socket,id=charmonitor,path=/var/lib/libvirt/qemu/vladimir.AS-0.monitor,server,nowait
 -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown 
-device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -netdev 
tap,fd=28,id=hostnet0 -device 
e1000,netdev=hostnet0,id=net0,mac=52:54:00:81:5b:df,bus=pci.0,addr=0x3,bootindex=1
 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 
-device pci-assign,host=02:00.0,id=hostdev0,configfd=29,bus=pci.0,addr=0x4 
-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5

Guest:
---------
# uname -a
Linux AS-0 2.6.34.13-WR4.3.fp_x86_64_standard-00019-g052bb3e #1 SMP Wed May 8 
12:21:02 EEST 2013 x86_64 x86_64 x86_64 GNU/Linux

#  cat /etc/*-release
Wind River Linux 4.3 glibc_cgl

# cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 42
model name      : Intel Xeon E312xx (Sandy Bridge)
stepping        : 1
cpu MHz         : 2693.893
cache size      : 4096 KB
fpu             : yes
fpu_exception   : yes
cpuid level     : 13
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat 
pse36 clflush mmx fxsr sse sse2 ss syscall nx lm constant_tsc rep_good pni 
pclmulqdq ssse3 cx16 sse4_1 sse4_2 x2apic popcnt aes xsave avx hypervisor 
lahf_lm xsaveopt
bogomips        : 5387.78
clflush size    : 64
cache_alignment : 64
address sizes   : 46 bits physical, 48 bits virtual

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1248959

Title:
  pdpe1gb flag is missing in guest running on Intel h/w

Status in QEMU:
  New

Bug description:
  I need to utilize 1G hugepages on my guest system. But this is not
  possible as long as there is no pdpe1gb support in guest system.  The
  latest source code contains pdpe1gb  support for AMD but not for
  Intel.

  Are there any obstacles that does not allow to implement it for modern
  Intel chips?

  My configuration:
  Host:
  -------
  uname -a
  Linux tripel.salab.cic.nsn-rdnet.net 2.6.32-358.14.1.el6.x86_64 #1 SMP Tue 
Jul 16 23:51:20 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

  cat /etc/*-release
  CentOS release 6.4 (Final)

  yum list installed | grep qemu
  gpxe-roms-qemu.noarch                0.9.7-6.9.el6             @base
  qemu-img.x86_64                      2:0.12.1.2-2.355.0.1.el6.centos.5
  qemu-kvm.x86_64                      2:0.12.1.2-2.355.0.1.el6.centos.5

  cat /proc/cpuinfo
  processor       : 0
  vendor_id       : GenuineIntel
  cpu family      : 6
  model           : 45
  model name      : Intel(R) Xeon(R) CPU E5-2680 0 @ 2.70GHz
  stepping        : 7
  cpu MHz         : 2700.000
  cache size      : 20480 KB
  physical id     : 0
  siblings        : 16
  core id         : 0
  cpu cores       : 8
  apicid          : 0
  initial apicid  : 0
  fpu             : yes
  fpu_exception   : yes
  cpuid level     : 13
  wp              : yes
  flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca 
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx 
pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology 
nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 
ssse3 cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer 
aes xsave avx lahf_lm ida arat epb xsaveopt pln pts dts tpr_shadow vnmi 
flexpriority ept vpid
  bogomips        : 5387.09
  clflush size    : 64
  cache_alignment : 64
  address sizes   : 46 bits physical, 48 bits virtual

  /usr/libexec/qemu-kvm -cpu ?
  Recognized CPUID flags:
    f_edx: pbe ia64 tm ht ss sse2 sse fxsr mmx acpi ds clflush pn pse36 pat 
cmov mca pge mtrr sep apic cx8 mce pae msr tsc pse de vme fpu
    f_ecx: hypervisor rdrand f16c avx osxsave xsave aes tsc-deadline popcnt 
movbe x2apic sse4.2|sse4_2 sse4.1|sse4_1 dca pcid pdcm xtpr cx16 fma cid ssse3 
tm2 est smx vmx ds_cpl monitor dtes64 pclmulqdq|pclmuldq pni|sse3
    extf_edx: 3dnow 3dnowext lm|i64 rdtscp pdpe1gb fxsr_opt|ffxsr fxsr mmx 
mmxext nx|xd pse36 pat cmov mca pge mtrr syscall apic cx8 mce pae msr tsc pse 
de vme fpu
    extf_ecx: perfctr_nb perfctr_core topoext tbm nodeid_msr tce fma4 lwp wdt 
skinit xop ibs osvw 3dnowprefetch misalignsse sse4a abm cr8legacy extapic svm 
cmp_legacy lahf_lm

  ps ax | grep qemu
   7197 ?        Sl     0:15 /usr/libexec/qemu-kvm -name vladimir.AS-0 -S -M 
rhel6.4.0 -cpu 
SandyBridge,+pdpe1gb,+osxsave,+dca,+pcid,+pdcm,+xtpr,+tm2,+est,+smx,+vmx,+ds_cpl,+monitor,+dtes64,+pbe,+tm,+ht,+ss,+acpi,+ds,+vme
 -enable-kvm -m 8192 -mem-prealloc -mem-path 
/var/lib/hugetlbfs/pagesize-1GB/libvirt/qemu -smp 4,sockets=4,cores=1,threads=1 
-uuid ec2d3c58-a7f0-fdbd-9de5-b547a5b3130f -nographic -nodefconfig -nodefaults 
-chardev 
socket,id=charmonitor,path=/var/lib/libvirt/qemu/vladimir.AS-0.monitor,server,nowait
 -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown 
-device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -netdev 
tap,fd=28,id=hostnet0 -device 
e1000,netdev=hostnet0,id=net0,mac=52:54:00:81:5b:df,bus=pci.0,addr=0x3,bootindex=1
 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 
-device pci-assign,host=02:00.0,id=hostdev0,configfd=29,bus=pci.0,addr=0x4 
-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5

  Guest:
  ---------
  # uname -a
  Linux AS-0 2.6.34.13-WR4.3.fp_x86_64_standard-00019-g052bb3e #1 SMP Wed May 8 
12:21:02 EEST 2013 x86_64 x86_64 x86_64 GNU/Linux

  #  cat /etc/*-release
  Wind River Linux 4.3 glibc_cgl

  # cat /proc/cpuinfo
  processor       : 0
  vendor_id       : GenuineIntel
  cpu family      : 6
  model           : 42
  model name      : Intel Xeon E312xx (Sandy Bridge)
  stepping        : 1
  cpu MHz         : 2693.893
  cache size      : 4096 KB
  fpu             : yes
  fpu_exception   : yes
  cpuid level     : 13
  wp              : yes
  flags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov 
pat pse36 clflush mmx fxsr sse sse2 ss syscall nx lm constant_tsc rep_good pni 
pclmulqdq ssse3 cx16 sse4_1 sse4_2 x2apic popcnt aes xsave avx hypervisor 
lahf_lm xsaveopt
  bogomips        : 5387.78
  clflush size    : 64
  cache_alignment : 64
  address sizes   : 46 bits physical, 48 bits virtual

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