874400 – "rdtscp" flag defined on Opteron_G5 model and cann't be exposed to guest

RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.

Bug 874400 - "rdtscp" flag defined on Opteron_G5 model and cann't be exposed to guest

Summary: "rdtscp" flag defined on Opteron_G5 model and cann't be exposed to guest

Keywords:
Status:	CLOSED ERRATA
Alias:	None
Product:	Red Hat Enterprise Linux 6
Classification:	Red Hat
Component:	qemu-kvm
Sub Component:
Version:	6.4
Hardware:	x86_64
OS:	Linux
Priority:	low
Severity:	low
Target Milestone:	rc
Target Release:	---
Assignee:	Eduardo Habkost
QA Contact:	Virtualization Bugs
Docs Contact:
URL:
Whiteboard:
Duplicates (1):	874398 (view as bug list)
Depends On:
Blocks:
TreeView+	depends on / blocked

Reported:	2012-11-08 05:32 UTC by FuXiangChun
Modified:	2013-02-21 07:44 UTC (History)
CC List:	11 users (show)
Fixed In Version:	qemu-kvm-0.12.1.2-2.338.el6
Doc Type:	Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed:	2013-02-21 07:44:12 UTC
Target Upstream Version:
Embargoed:

Attachments	(Terms of Use)

Links
System	ID	Private	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHBA-2013:0527	0	normal	SHIPPED_LIVE	qemu-kvm bug fix and enhancement update	2013-02-20 21:51:08 UTC

Description FuXiangChun 2012-11-08 05:32:32 UTC

Description of problem:
 CPUID_EXT2_RDTSCP present on the Opteron_G5 model from code target-i386/cpuid.c
and it cann't be exposed to guest. according to bug 814426. It should be removed from G5 model.

Version-Release number of selected component (if applicable):
host:
# uname -r
2.6.32-339.el6.x86_64
# rpm -qa|grep qemu
qemu-kvm-0.12.1.2-2.334.el6.x86_64

Additional, host cpu is AMD Seoul, and 16 cores.  

guest kernel:
# uname -r
2.6.32-339.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
1. boot guest
usr/libexec/qemu-kvm -M rhel6.4.0 -cpu Opteron_G5 -enable-kvm -m 2048 -smp 2,sockets=1,cores=2,threads=1,maxcpus=16 -usb -device usb-tablet,id=input0 -name Opteron_G5 -uuid 990ea161-6b67-47b2-b803-19fb01d30d31 -rtc base=localtime,clock=host,driftfix=slew -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x3 -drive file=/root/fuxc/rhel6.4-64.qcow2,if=none,id=drive-ide-disk0,format=qcow2,cache=none,werror=stop,rerror=stop -device ide-drive,drive=drive-ide-disk0,id=ide-disk0 -netdev tap,id=hostnet0,script=/etc/qemu-ifup -device e1000,netdev=hostnet0,id=e1000-net-pci0,mac=00:1B:21:A8:0D:B1,bus=pci.0,addr=0x5 -spice port=5932,disable-ticketing,seamless-migration=on -vga qxl -global qxl-vga.vram_size=67108864 -nodefaults -qmp tcp:0:7777,server,nowait -boot menu=on -monitor stdio -device sga -chardev socket,id=serial0,path=/var/test1,server,nowait -device isa-serial,chardev=serial0

2.check register and cpuinfo in host and guest

3.check code target-i386/cpuid.c  
  output of G5 model is in additional info.

Actual results:
host:
register values(rdtscp location is Function 80000001.EDX[27])
eax in: 0x80000001, eax = 00600f20 ebx = 50000000 ecx = 01ebbfff edx = 2fd3fbff
 
rdtscp present in /proc/cpuinfo

guest:
eax in: 0x80000001, eax = 00600f20 ebx = 00000000 ecx = 002109e3 edx = 2593fbfd
rdtscp not present in /proc/cpuinfo

Expected results:
remove the flag from Opteron_G5 model or enable it

Additional info:
       .name = "Opteron_G5",
        .level = 0xd,
        .vendor1 = CPUID_VENDOR_AMD_1,
        .vendor2 = CPUID_VENDOR_AMD_2,
        .vendor3 = CPUID_VENDOR_AMD_3,
        .family = 21,
        .model = 2,
        .stepping = 0,
        .features = CPUID_SSE2 | CPUID_SSE | CPUID_FXSR | CPUID_MMX |
             CPUID_CLFLUSH | CPUID_PSE36 | CPUID_PAT | CPUID_CMOV | CPUID_MCA |
             CPUID_PGE | CPUID_MTRR | CPUID_SEP | CPUID_APIC | CPUID_CX8 |
             CPUID_MCE | CPUID_PAE | CPUID_MSR | CPUID_TSC | CPUID_PSE |
             CPUID_DE | CPUID_FP87,
        .ext_features = CPUID_EXT_F16C | CPUID_EXT_AVX | CPUID_EXT_XSAVE |
             CPUID_EXT_AES | CPUID_EXT_POPCNT | CPUID_EXT_SSE42 |
             CPUID_EXT_SSE41 | CPUID_EXT_CX16 | CPUID_EXT_FMA |
             CPUID_EXT_SSSE3 | CPUID_EXT_PCLMULQDQ | CPUID_EXT_SSE3,
        .ext2_features = CPUID_EXT2_LM | CPUID_EXT2_RDTSCP |
             CPUID_EXT2_PDPE1GB | CPUID_EXT2_FXSR | CPUID_EXT2_MMX |
             CPUID_EXT2_NX | CPUID_EXT2_PSE36 | CPUID_EXT2_PAT |
             CPUID_EXT2_CMOV | CPUID_EXT2_MCA | CPUID_EXT2_PGE |
             CPUID_EXT2_MTRR | CPUID_EXT2_SYSCALL | CPUID_EXT2_APIC |
             CPUID_EXT2_CX8 | CPUID_EXT2_MCE | CPUID_EXT2_PAE | CPUID_EXT2_MSR |
             CPUID_EXT2_TSC | CPUID_EXT2_PSE | CPUID_EXT2_DE | CPUID_EXT2_FPU,
        .ext3_features = CPUID_EXT3_TBM | CPUID_EXT3_FMA4 | CPUID_EXT3_XOP |
             CPUID_EXT3_3DNOWPREFETCH | CPUID_EXT3_MISALIGNSSE |
             CPUID_EXT3_SSE4A | CPUID_EXT3_ABM | CPUID_EXT3_SVM |
             CPUID_EXT3_LAHF_LM,
        .xlevel = 0x8000001A,
        .model_id = "AMD Opteron 63xx class CPU",

Comment 2 juzhang 2012-11-08 06:01:06 UTC

*** Bug 874398 has been marked as a duplicate of this bug. ***

Comment 8 FuXiangChun 2012-12-17 03:21:39 UTC

Verify this issue with qemu-kvm-0.12.1.2-2.346.el6.x86_64

verify to steps as Description

result:
1.flag cann't be exported to guest. qemu have removed it from code.

2.cpuid.c code.
{
        .name = "Opteron_G5",
        .level = 0xd,
        .vendor1 = CPUID_VENDOR_AMD_1,
        .vendor2 = CPUID_VENDOR_AMD_2,
        .vendor3 = CPUID_VENDOR_AMD_3,
        .family = 21,
        .model = 2,
        .stepping = 0,
        .features = CPUID_SSE2 | CPUID_SSE | CPUID_FXSR | CPUID_MMX |
             CPUID_CLFLUSH | CPUID_PSE36 | CPUID_PAT | CPUID_CMOV | CPUID_MCA |
             CPUID_PGE | CPUID_MTRR | CPUID_SEP | CPUID_APIC | CPUID_CX8 |
             CPUID_MCE | CPUID_PAE | CPUID_MSR | CPUID_TSC | CPUID_PSE |
             CPUID_DE | CPUID_FP87,
        .ext_features = CPUID_EXT_F16C | CPUID_EXT_AVX | CPUID_EXT_XSAVE |
             CPUID_EXT_AES | CPUID_EXT_POPCNT | CPUID_EXT_SSE42 |
             CPUID_EXT_SSE41 | CPUID_EXT_CX16 | CPUID_EXT_FMA |
             CPUID_EXT_SSSE3 | CPUID_EXT_PCLMULQDQ | CPUID_EXT_SSE3,
        .ext2_features = CPUID_EXT2_LM |
             CPUID_EXT2_PDPE1GB | CPUID_EXT2_FXSR | CPUID_EXT2_MMX |
             CPUID_EXT2_NX | CPUID_EXT2_PSE36 | CPUID_EXT2_PAT |
             CPUID_EXT2_CMOV | CPUID_EXT2_MCA | CPUID_EXT2_PGE |
             CPUID_EXT2_MTRR | CPUID_EXT2_SYSCALL | CPUID_EXT2_APIC |
             CPUID_EXT2_CX8 | CPUID_EXT2_MCE | CPUID_EXT2_PAE | CPUID_EXT2_MSR |
             CPUID_EXT2_TSC | CPUID_EXT2_PSE | CPUID_EXT2_DE | CPUID_EXT2_FPU,
        .ext3_features = CPUID_EXT3_TBM | CPUID_EXT3_FMA4 | CPUID_EXT3_XOP |
             CPUID_EXT3_3DNOWPREFETCH | CPUID_EXT3_MISALIGNSSE |
             CPUID_EXT3_SSE4A | CPUID_EXT3_ABM | CPUID_EXT3_SVM |
             CPUID_EXT3_LAHF_LM,
        .xlevel = 0x8000001A,
   .model_id = "AMD Opteron 63xx class CPU",
    },
};

3. guest register
eax in: 0x80000001, eax = 00600f20 ebx = 00000000 ecx = 002109e3 edx = 2593fbfd

4. not find this flag form cpuinfo in guest

so base on this test result as above, I think this bug is fixed.

Comment 10 errata-xmlrpc 2013-02-21 07:44:12 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2013-0527.html

Note You need to log in before you can comment on or make changes to this bug.