[Bug 216098] New: Assertion Failure in kvm selftest mmu_role_test

[Bug 216098] New: Assertion Failure in kvm selftest mmu_role_test

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=216098

               URL: https://git.kernel.org/pub/scm/linux/kernel/git/torval
                    ds/linux.git
            Bug ID: 216098
           Summary: Assertion Failure in kvm selftest mmu_role_test
           Product: Virtualization
           Version: unspecified
    Kernel Version: 5.18
          Hardware: Intel
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: kvm
          Assignee: virtualization_kvm@kernel-bugs.osdl.org
          Reporter: lixiao.yang@intel.com
        Regression: No

Created attachment 301133
  --> https://bugzilla.kernel.org/attachment.cgi?id=301133&action=edit
The kernel config file I used to build kernel

Environment:
CPU Architecture: x86_64
Host OS: Red Hat Enterprise Linux 8.4 (Ootpa)
Host kernel: Linux 5.18 release 
gcc: gcc (GCC) 8.3.1 
Host kernel source:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Branch: master
Commit: 4b0986a3613c92f4ec1bdc7f60ec66fea135991f
Tag: v5.18

Bug Detailed Description:
Assertion failure happened after executing kvm selftest mmu_role_test with
argument -g or -m.


Reproducing Steps:
git clone https://git.kernel.org/pub/scm/virt/kvm/kvm.git
cd kvm/tools/testing/selftests/kvm && make
cd x86_64 && ./mmu_role_test -g
./mmu_role_test -m

Actual Result:
[root@icx-2s2 ~]# /usr/local/bin/mmu_role_test -g
Test MMIO after toggling CPUID.GBPAGES
==== Test Assertion Failure ====
  lib/x86_64/processor.c:898: rc == 0
  pid=189748 tid=189748 errno=22 - Invalid argument
     1  0x000000000040b66a: vcpu_set_cpuid at processor.c:897
     2  0x00000000004026df: mmu_role_test at mmu_role_test.c:60
     3  0x00000000004024a2: main at mmu_role_test.c:137
     4  0x00007f73b16237b2: ?? ??:0
     5  0x00000000004024ed: _start at ??:?
  KVM_SET_CPUID2 failed, rc: -1 errno: 22

[root@icx-2s2 ~]# /usr/local/bin/mmu_role_test -m
Test MMIO after changing CPUID.MAXPHYADDR
==== Test Assertion Failure ====
  lib/x86_64/processor.c:898: rc == 0
  pid=189759 tid=189759 errno=22 - Invalid argument
     1  0x000000000040b66a: vcpu_set_cpuid at processor.c:897
     2  0x00000000004026df: mmu_role_test at mmu_role_test.c:60
     3  0x0000000000402479: main at mmu_role_test.c:143
     4  0x00007f318f8237b2: ?? ??:0
     5  0x00000000004024ed: _start at ??:?
  KVM_SET_CPUID2 failed, rc: -1 errno: 22

Expected result:
[root@icx-2s2 ~]# /usr/local/bin/mmu_role_test -g
[root@icx-2s2 ~]# /usr/local/bin/mmu_role_test -m
[root@icx-2s2 ~]#

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[Bug 216098] Assertion Failure in kvm selftest mmu_role_test

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=216098

--- Comment #1 from Yang Lixiao (lixiao.yang@intel.com) ---
(In reply to Yang Lixiao from comment #0)
Correction:
Actual Result:
[root@icx-2s2 ~]# kvm/tools/testing/selftests/kvm/mmu_role_test -g
Test MMIO after toggling CPUID.GBPAGES
==== Test Assertion Failure ====
  lib/x86_64/processor.c:898: rc == 0
  pid=189748 tid=189748 errno=22 - Invalid argument
     1  0x000000000040b66a: vcpu_set_cpuid at processor.c:897
     2  0x00000000004026df: mmu_role_test at mmu_role_test.c:60
     3  0x00000000004024a2: main at mmu_role_test.c:137
     4  0x00007f73b16237b2: ?? ??:0
     5  0x00000000004024ed: _start at ??:?
  KVM_SET_CPUID2 failed, rc: -1 errno: 22

[root@icx-2s2 ~]#kvm/tools/testing/selftests/kvm/mmu_role_test -m
Test MMIO after changing CPUID.MAXPHYADDR
==== Test Assertion Failure ====
  lib/x86_64/processor.c:898: rc == 0
  pid=189759 tid=189759 errno=22 - Invalid argument
     1  0x000000000040b66a: vcpu_set_cpuid at processor.c:897
     2  0x00000000004026df: mmu_role_test at mmu_role_test.c:60
     3  0x0000000000402479: main at mmu_role_test.c:143
     4  0x00007f318f8237b2: ?? ??:0
     5  0x00000000004024ed: _start at ??:?
  KVM_SET_CPUID2 failed, rc: -1 errno: 22

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[Bug 216098] Assertion Failure in kvm selftest mmu_role_test

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=216098

Sean Christopherson (seanjc@google.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |seanjc@google.com

--- Comment #2 from Sean Christopherson (seanjc@google.com) ---
This test was made obsolete by disallowing CPUID changes after KVM_RUN.

https://lore.kernel.org/all/20220604012058.1972195-14-seanjc@google.com

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