Ubuntu
qemu package

[KVM][CLX] CPUID_7_0_EDX_ARCH_CAPABILITIES is not enabled in VM.

Bug #1829760 reported by Paul Lai
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
qemu (Ubuntu)
New
Undecided
Unassigned

Bug Description

Description of problem:
[KVM][CLX] CPUID_7_0_EDX_ARCH_CAPABILITIES is not enabled in VM.

How reproducible:
Upstream always, Ubuntu unknown.

Steps to Reproduce:
1. Boot up guest using: -cpu Cascadelake-Server

[root@clx-2s2 yexin]# qemu-system-x86_64 -accel kvm -drive if=virtio,id=hd,file=/home/yexin/rhel7u6.qcow2,format=qcow2 -m 4096 -smp 4 -cpu Cascadelake-Server -serial stdio

char device redirected to /dev/pts/3 (label serial0)

qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:ECX [bit 4]

qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:ECX [bit 4]

qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:ECX [bit 4]

qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:ECX [bit 4]

2. To check CPU ID related to features[FEAT_7_0_EDX] ：CPUID_7_0_EDX_ARCH_CAPABILITIES

Actual results:
Host's cpuid: 0x00000007 0x00: eax=0x00000000 ebx=0xd39ffffb ecx=0x00000818 edx=0xbc000000 (EDX bit 29=1)

Guest's cpuid : 0x00000007 0x00: eax=0x00000000 ebx=0xd19f0fb9 ecx=0x00000818 edx=0x84000000 (EDX bit 29=0)

Expected results:
Both host and guest's CPUID.07H EDX bit 29 should be 1.

Additional info:
Upstream 5.0 fixed, commit:
2bdb76c015df7125783d8394d6339d181cb5bc30

Kernel:
commit 2bdb76c015df7125783d8394d6339d181cb5bc30
Author: Xiaoyao Li <email address hidden>
Date: Fri Mar 8 15:57:20 2019 +0800
    kvm/x86: Move MSR_IA32_ARCH_CAPABILITIES to array emulated_msrs

commit 0cf9135b773bf32fba9dd8e6699c1b331ee4b749
Author: Sean Christopherson <email address hidden>
Date: Thu Mar 7 15:43:02 2019 -0800

    KVM: x86: Emulate MSR_IA32_ARCH_CAPABILITIES on AMD hosts

QEMU:

commit 014018e19b3c54dd1bf5072bc912ceffea40abe8
Author: Eduardo Habkost <email address hidden>
Date: Fri Jan 25 20:06:06 2019 -0200
   i386: Make arch_capabilities migratable

commit 485b1d256bcb0874bcde0223727c159b6837e6f8
Author: Eduardo Habkost <email address hidden>
Date: Fri Jan 25 20:06:05 2019 -0200
   i386: kvm: Disable arch_capabilities if MSR can't be set

commit b0a1980384fc265d91de7e09aa5fe531a69e6288
Author: Tao Xu <email address hidden>
Date: Thu Dec 27 10:43:03 2018 +0800
   i386: Update stepping of Cascadelake-Server

commit aec5e9c3a94cf8b7920f59bef69a6f426092c4a0
Author: Bandan Das <email address hidden>
Date: Sun Nov 25 23:17:28 2018 -0500
   kvm: Use KVM_GET_MSR_INDEX_LIST for MSR_IA32_ARCH_CAPABILITIES support

commit 07585923485952bf4cb7da563c9f91fecc85d09c
Author: Robert Hoo <email address hidden>
Date: Mon Oct 15 12:47:24 2018 +0800
   x86: Data structure changes to support MSR based features

commit f57bceb6ab5163ddd6c41ff4344ab8cf28a9c63d
Author: Robert Hoo <email address hidden>
Date: Mon Oct 15 12:47:23 2018 +0800
   kvm: Add support to KVM_GET_MSR_FEATURE_INDEX_LIST and KVM_GET_MSRS system ioctl

commit d86f963694df27f11b3681ffd225c9362de1b634
Author: Robert Hoo <email address hidden>
Date: Mon Oct 15 12:47:25 2018 +0800
   x86: define a new MSR based feature word – FEATURE_WORDS_ARCH_CAPABILITIES

commit c7a88b52f62b30c04158eeb07f73e3f72221b6a8
Author: Tao Xu <email address hidden>
Date: Wed Sep 19 11:11:22 2018 +0800
   i386: Add new model of Cascadelake-Server

commit 3fc7c73139d2d38ae80c3b0bc963b1ac1555924c
Author: Robert Hoo <email address hidden>
Date: Thu Jul 5 17:09:55 2018 +0800
   i386: Add CPUID bit and feature words for IA32_ARCH_CAPABILITIES MSR

commit 8a11c62da9146dd89aee98947e6bd831e65a970d
Author: Robert Hoo <email address hidden>
Date: Thu Jul 5 17:09:58 2018 +0800
   i386: Add new CPU model Icelake-{Server,Client}

commit 8c80c99fcceabd0708a5a83f08577e778c9419f5
Author: Robert Hoo <email address hidden>
Date: Thu Jul 5 17:09:54 2018 +0800
   i386: Add new MSR indices for IA32_PRED_CMD and IA32_ARCH_CAPABILITIES

Revision history for this message
Andreas Hasenack (ahasenack) wrote :

Isn't this qemu/kvm, instead of xen?

affects: xen (Ubuntu) → qemu (Ubuntu)
Revision history for this message
Paul Lai (pclai) wrote :

Yes, this is qemu/kvm, not xen. Strange, I thought I filed it against kvm.

Revision history for this message
Dan Streetman (ddstreet) wrote :

note bug 1828495...even the description appears taken from that bug. is there a reason this isn't a dup?

Revision history for this message
Christian Ehrhardt  (paelzer) wrote :

No there is not, dup'ping

Revision history for this message
Paul Lai (pclai) wrote : RE: [Bug 1829760] Re: [KVM][CLX] CPUID_7_0_EDX_ARCH_CAPABILITIES is not enabled in VM.
Download full text (4.9 KiB)

No reason not to dup. Did not find 1828495 before writing 1829760

-----Original Message-----
From: <email address hidden> [mailto:<email address hidden>] On Behalf Of Dan Streetman
Sent: Tuesday, May 21, 2019 1:04 PM
To: Lai, Paul C <email address hidden>
Subject: [Bug 1829760] Re: [KVM][CLX] CPUID_7_0_EDX_ARCH_CAPABILITIES is not enabled in VM.

note bug 1828495...even the description appears taken from that bug. is there a reason this isn't a dup?

--
You received this bug notification because you are subscribed to the bug report.
https://bugs.launchpad.net/bugs/1829760

Title:
  [KVM][CLX] CPUID_7_0_EDX_ARCH_CAPABILITIES is not enabled in VM.

Status in qemu package in Ubuntu:
  New

Bug description:
  Description of problem:
  [KVM][CLX] CPUID_7_0_EDX_ARCH_CAPABILITIES is not enabled in VM.

  How reproducible:
  Upstream always, Ubuntu unknown.

  Steps to Reproduce:
  1. Boot up guest using: -cpu Cascadelake-Server

  [root@clx-2s2 yexin]# qemu-system-x86_64 -accel kvm -drive
  if=virtio,id=hd,file=/home/yexin/rhel7u6.qcow2,format=qcow2 -m 4096
  -smp 4 -cpu Cascadelake-Server -serial stdio

  char device redirected to /dev/pts/3 (label serial0)

  qemu-system-x86_64: warning: host doesn't support requested feature:
  CPUID.07H:ECX [bit 4]

  qemu-system-x86_64: warning: host doesn't support requested feature:
  CPUID.07H:ECX [bit 4]

  qemu-system-x86_64: warning: host doesn't support requested feature:
  CPUID.07H:ECX [bit 4]

  qemu-system-x86_64: warning: host doesn't support requested feature:
  CPUID.07H:ECX [bit 4]

  2. To check CPU ID related to features[FEAT_7_0_EDX]
  ：CPUID_7_0_EDX_ARCH_CAPABILITIES

  Actual results:
  Host's cpuid: 0x00000007 0x00: eax=0x00000000 ebx=0xd39ffffb ecx=0x00000818 edx=0xbc000000 (EDX bit 29=1)

  Guest's cpuid : 0x00000007 0x00: eax=0x00000000 ebx=0xd19f0fb9
  ecx=0x00000818 edx=0x84000000 (EDX bit 29=0)

  Expected results:
  Both host and guest's CPUID.07H EDX bit 29 should be 1.

  Additional info:
  Upstream 5.0 fixed, commit:
  2bdb76c015df7125783d8394d6339d181cb5bc30

  Kernel:
  commit 2bdb76c015df7125783d8394d6339d181cb5bc30
  Author: Xiaoyao Li <email address hidden>
  Date: Fri Mar 8 15:57:20 2019 +0800
      kvm/x86: Move MSR_IA32_ARCH_CAPABILITIES to array emulated_msrs

  commit 0cf9135b773bf32fba9dd8e6699c1b331ee4b749
  Author: Sean Christopherson <email address hidden>
  Date: Thu Mar 7 15:43:02 2019 -0800

      KVM: x86: Emulate MSR_IA32_ARCH_CAPABILITIES on AMD hosts

  QEMU:

  commit 014018e19b3c54dd1bf5072bc912ceffea40abe8
  Author: Eduardo Habkost <email address hidden>
  Date: Fri Jan 25 20:06:06 2019 -0200
     i386: Make arch_capabilities migratable

  commit 485b1d256bcb0874bcde0223727c159b6837e6f8
  Author: Eduardo Habkost <email address hidden>
  Date: Fri Jan 25 20:06:05 2019 -0200
     i386: kvm: Disable arch_capabilities if MSR can't be set

  commit b0a1980384fc265d91de7e09aa5fe531a69e6288
  Author: Tao Xu <email address hidden>
  Date: Thu Dec 27 10:43:03 2018 +0800
     i386: Update stepping of Cascadelake-Server

  com...

Read more...

To post a comment you must log in.
This report contains Public information  
Everyone can see this information.
Subscribing...

Other bug subscribers

Remote bug watches

Bug watches keep track of this bug in other bug trackers.