| Summary: | CPU flags in guest don't match with qemu-kvm cpu dump info | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Product: | Red Hat Enterprise Linux 6 | Reporter: | Chao Yang <chayang> | ||||||
| Component: | qemu-kvm | Assignee: | john cooper <john.cooper> | ||||||
| Status: | CLOSED NOTABUG | QA Contact: | Virtualization Bugs <virt-bugs> | ||||||
| Severity: | medium | Docs Contact: | |||||||
| Priority: | medium | ||||||||
| Version: | 6.1 | CC: | bcao, juzhang, michen, mkenneth, nobody, shuang, shu, tburke, virt-maint, yacui | ||||||
| Target Milestone: | rc | ||||||||
| Target Release: | --- | ||||||||
| Hardware: | x86_64 | ||||||||
| OS: | Unspecified | ||||||||
| Whiteboard: | |||||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||||
| Doc Text: | Story Points: | --- | |||||||
| Clone Of: | Environment: | ||||||||
| Last Closed: | 2011-04-13 00:17:39 UTC | Type: | --- | ||||||
| Regression: | --- | Mount Type: | --- | ||||||
| Documentation: | --- | CRM: | |||||||
| Verified Versions: | Category: | --- | |||||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||||
| Attachments: |
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Created attachment 487449 [details]
AMD host flag dump info using x86info & cat /proc/cpuinfo
# /usr/libexec/qemu-kvm -cpu ?dump x86 Opteron_G3 AMD Opteron 23xx (Gen 3 Class Opteron) family 15 model 6 stepping 1 level 5 xlevel 0x80000008 vendor "AuthenticAMD" feature_edx 078bfbfd (sse2 sse fxsr mmx clflush pse36 pat cmov mca pge mtrr sep apic cx8 mce pae msr tsc pse de fpu) feature_ecx 00a02009 (popcnt x2apic cx16 monitor pni|sse3) extfeature_edx 2993fbfd (lm|i64 rdtscp fxsr mmx nx|xd pse36 pat cmov mca pge mtrr syscall apic cx8 mce pae msr tsc pse de fpu) extfeature_ecx 000000e5 (misalignsse sse4a abm svm lahf_lm) x86 Opteron_G2 AMD Opteron 22xx (Gen 2 Class Opteron) family 15 model 6 stepping 1 level 5 xlevel 0x80000008 vendor "AuthenticAMD" feature_edx 078bfbfd (sse2 sse fxsr mmx clflush pse36 pat cmov mca pge mtrr sep apic cx8 mce pae msr tsc pse de fpu) feature_ecx 00202001 (x2apic cx16 pni|sse3) extfeature_edx 2993fbfd (lm|i64 rdtscp fxsr mmx nx|xd pse36 pat cmov mca pge mtrr syscall apic cx8 mce pae msr tsc pse de fpu) extfeature_ecx 00000005 (svm lahf_lm) x86 Opteron_G1 AMD Opteron 240 (Gen 1 Class Opteron) family 15 model 6 stepping 1 level 5 xlevel 0x80000008 vendor "AuthenticAMD" feature_edx 078bfbfd (sse2 sse fxsr mmx clflush pse36 pat cmov mca pge mtrr sep apic cx8 mce pae msr tsc pse de fpu) feature_ecx 00200001 (x2apic pni|sse3) extfeature_edx 2193fbfd (lm|i64 fxsr mmx nx|xd pse36 pat cmov mca pge mtrr syscall apic cx8 mce pae msr tsc pse de fpu) extfeature_ecx 00000000 () Tested host Opetron G2 model commandline: ------------ qemu-kvm -name 'vm1' -drive file='/root/win2003-32-virtio.qcow2',index=0,if=none,id=drive-virtio-disk1,media=disk,cache=none,format=qcow2,aio=native -device virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk1,id=virtio-disk1 -device virtio-net-pci,netdev=id30ex6J,mac=9a:da:dc:13:6c:79,id=ndev00id30ex6J,bus=pci.0,addr=0x3 -netdev tap,id=id30ex6J,vhost=on,ifname='t0-142301-YINn',script='/root/autotest-devel/client/tests/kvm/scripts/qemu-ifup-switch',downscript='no' -m 512 -smp 4,cores=4,threads=1,sockets=1 -cpu Opteron_G1 -vnc :0 -rtc base=utc,clock=host,driftfix=none -M rhel6.1.0 -boot order=cdn,once=c,menu=off -usbdevice tablet -no-kvm-pit-reinjection -enable-kvm expected result: (output in qemu-kvm -cpu ?dump) ---------------- x86 Opteron_G1 AMD Opteron 240 (Gen 1 Class Opteron) family 15 model 6 stepping 1 level 5 xlevel 0x80000008 vendor "AuthenticAMD" feature_edx 078bfbfd (sse2 sse fxsr mmx clflush pse36 pat cmov mca pge mtrr sep apic cx8 mce pae msr tsc pse de fpu) feature_ecx 00200001 (x2apic pni|sse3) extfeature_edx 2193fbfd (lm|i64 fxsr mmx nx|xd pse36 pat cmov mca pge mtrr syscall apic cx8 mce pae msr tsc pse de fpu) extfeature_ecx 00000000 () checking rule: -------------- the following is output truncated from 'x86info -a -f' in the 'eax in: 0x00000001' line, the ecx and edx value should equal to feature_ecx and feature_edx in the 'eax in: 0x80000001' line, the ecx and edx value should equal to extfeature_ecx and extfeature_edx actual result(tested on rhel6.0.z-32bit,rhel6.1-32bit,win2k3-32bit,win7-32bit) ------------- eax in: 0x00000001, eax = 00000f61 ebx = 00040800 ecx = 80200001 edx = 178bfbfd eax in: 0x80000001, eax = 00000f61 ebx = 00000000 ecx = 00000002 edx = 2193fbfd note: when i change the -cpu parameter from '-cpu Opteron_G1' to '-cpu Opteron_G1,vendor="GenuineIntel"', the ecx in 'eax in: 0x80000001' line will change from '00000002' to '00000000' while other values stay the same. (In reply to comment #4) > Tested host Opetron G2 model > > commandline: > ------------ > qemu-kvm -name 'vm1' -drive > file='/root/win2003-32-virtio.qcow2',index=0,if=none,id=drive-virtio-disk1,media=disk,cache=none,format=qcow2,aio=native : > -m 512 -smp 4,cores=4,threads=1,sockets=1 -cpu Opteron_G1 -vnc :0 -rtc : > (output in qemu-kvm -cpu ?dump) > ---------------- > x86 Opteron_G1 AMD Opteron 240 (Gen 1 Class Opteron) > family 15 model 6 stepping 1 level 5 xlevel 0x80000008 vendor "AuthenticAMD" > feature_edx 078bfbfd (sse2 sse fxsr mmx clflush pse36 pat cmov mca pge mtrr > sep apic cx8 mce pae msr tsc pse de fpu) 178bfbfd ^ 078bfbfd -> 10000000 HTT Always forced true if (1 < #cores * #threads), as is the case above given "-smp 4,cores=4,threads=1,sockets=1" > feature_ecx 00200001 (x2apic pni|sse3) 80200001 ^ 00200001 -> 80000000 RAZ (Reserved for use by hypervisor to indicate guest status) qemu forces this bit true unconditionally to indicate the guest is running as a guest vs. natively. > extfeature_edx 2193fbfd (lm|i64 fxsr mmx nx|xd pse36 pat cmov mca pge mtrr > syscall apic cx8 mce pae msr tsc pse de fpu) 2193fbfd ^ 2193fbfd -> 00000000 > extfeature_ecx 00000000 () 00000002 ^ 00000000 -> 00000002 CmpLegacy: core multi-processing legacy mode. always set by qemu unless the cpuid vendor == intel (IOW this bit is cleared in the case of an intel vendor host, for the benefit of linux boot-time thread/topology determination) > checking rule: > -------------- > the following is output truncated from 'x86info -a -f' > in the 'eax in: 0x00000001' line, the ecx and edx value should equal to > feature_ecx and feature_edx > in the 'eax in: 0x80000001' line, the ecx and edx value should equal to > extfeature_ecx and extfeature_edx > > actual result(tested on rhel6.0.z-32bit,rhel6.1-32bit,win2k3-32bit,win7-32bit) > ------------- > eax in: 0x00000001, eax = 00000f61 ebx = 00040800 ecx = 80200001 edx = 178bfbfd > eax in: 0x80000001, eax = 00000f61 ebx = 00000000 ecx = 00000002 edx = 2193fbfd > > note: > when i change the -cpu parameter from '-cpu Opteron_G1' to '-cpu > Opteron_G1,vendor="GenuineIntel"', the ecx in 'eax in: 0x80000001' line will > change from '00000002' to '00000000' while other values stay the same. Yes this is intentional, see "CmpLegacy" above. |
Created attachment 487448 [details] what tools see in guest Description of problem: Boot guest with -cpu Opteron_G3,check it only complains "warning: host cpuid 8000_0001:ecx flag restricted to guest 'svm' [0x00000004]", so I should see all flags except svm, actually in guest, not only svm flags are turned off and some flags are turned on when pass flags from host to guest. following is what qemu-kvm says when booting guest with different cpu model and will attach flags x86info sees & /proc/cpuinfo sees: # /usr/libexec/qemu-kvm -M rhel6.1.0 -enable-kvm -m 4096 -smp 2,cores=4,threads=1,socket=2 -cpu Opteron_G1,check -name rhel6.1 -uuid `uuidgen` -rtc base=localtime,clock=vm,driftfix=slew -no-kvm-pit-reinjection -boot c -drive file=/mnt/images/rhel6.1-64.qcow2,if=none,id=drive-virtio-0-0,media=disk,format=qcow2,cache=none -device virtio-blk-pci,drive=drive-virtio-0-0,id=virt0-0-0 -netdev tap,id=hostnet1 -device virtio-net-pci,netdev=hostnet1,id=net1,mac=52:54:40:81:11:53 -usb -device usb-tablet,id=input1 -vnc :0 -monitor stdio -balloon none Using CPU model "Opteron_G1,check" Using CPU model "Opteron_G1,check" QEMU 0.12.1 monitor - type 'help' for more information (qemu) # /usr/libexec/qemu-kvm -M rhel6.1.0 -enable-kvm -m 4096 -smp 2,cores=4,threads=1,socket=2 -cpu Opteron_G2,check -name rhel6.1 -uuid `uuidgen` -rtc base=localtime,clock=vm,driftfix=slew -no-kvm-pit-reinjection -boot c -drive file=/mnt/images/rhel6.1-64.qcow2,if=none,id=drive-virtio-0-0,media=disk,format=qcow2,cache=none -device virtio-blk-pci,drive=drive-virtio-0-0,id=virt0-0-0 -netdev tap,id=hostnet1 -device virtio-net-pci,netdev=hostnet1,id=net1,mac=52:54:40:81:11:53 -usb -device usb-tablet,id=input1 -vnc :0 -monitor stdio -balloon none Using CPU model "Opteron_G2,check" warning: host cpuid 8000_0001:ecx flag restricted to guest 'svm' [0x00000004] Using CPU model "Opteron_G2,check" warning: host cpuid 8000_0001:ecx flag restricted to guest 'svm' [0x00000004] QEMU 0.12.1 monitor - type 'help' for more information (qemu) # /usr/libexec/qemu-kvm -M rhel6.1.0 -enable-kvm -m 4096 -smp 2,cores=4,threads=1,socket=2 -cpu Opteron_G3,check -name rhel6.1 -uuid `uuidgen` -rtc base=localtime,clock=vm,driftfix=slew -no-kvm-pit-reinjection -boot c -drive file=/mnt/images/rhel6.1-64.qcow2,if=none,id=drive-virtio-0-0,media=disk,format=qcow2,cache=none -device virtio-blk-pci,drive=drive-virtio-0-0,id=virt0-0-0 -netdev tap,id=hostnet1 -device virtio-net-pci,netdev=hostnet1,id=net1,mac=52:54:40:81:11:53 -usb -device usb-tablet,id=input1 -vnc :0 -monitor stdio -balloon none Using CPU model "Opteron_G3,check" warning: host cpuid 8000_0001:ecx flag restricted to guest 'svm' [0x00000004] Using CPU model "Opteron_G3,check" warning: host cpuid 8000_0001:ecx flag restricted to guest 'svm' [0x00000004] QEMU 0.12.1 monitor - type 'help' for more information (qemu) Version-Release number of selected component (if applicable): qemu-kvm-0.12.1.2-2.151.el6.x86_64 How reproducible: 100% Steps to Reproduce: 1. 2. 3. Actual results: Expected results: Additional info: Same issue happens with -cpu Opteron_G2,check, -cpu Opteron_G1,check