[Bug 198991] New: KVM: entry failed, hardware error 0x80000021

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

https://bugzilla.kernel.org/show_bug.cgi?id=198991

            Bug ID: 198991
           Summary: KVM: entry failed, hardware error 0x80000021
           Product: Virtualization
           Version: unspecified
    Kernel Version: 4.14.22
          Hardware: Intel
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: kvm
          Assignee: virtualization_kvm@xxxxxxxxxxxxxxxxxxxx
          Reporter: kernel@xxxxxxxxx
        Regression: No

Hi,

I have a bug with KVM on kernel 4.14.22 and 4.14.23 which I didn't had on
4.14.21

When I reboot the host, the VMs failed to resume every 2 or 3 reboots, with
this log:

KVM: entry failed, hardware error 0x80000021

If you're running a guest on an Intel machine without unrestricted mode
support, the failure can be most likely due to the guest entering an invalid
state for Intel VT. For example, the guest maybe running in big real mode
which is not supported on less recent Intel processors.

EAX=80000000 EBX=ba012480 ECX=1fc19320 EDX=00006fce
ESI=00000000 EDI=00000000 EBP=00000000 ESP=ba003ea0
EIP=b9657965 EFL=00000246 [---Z-P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0000 00000000 0000ffff 00009300
CS =f000 ffff0000 0000ffff 00009b00
SS =0000 00000000 0000ffff 00009300
DS =0000 00000000 0000ffff 00009300
FS =0000 00000000 0000ffff 00009300
GS =0000 00000000 0000ffff 00009300
LDT=0000 00000000 0000ffff 00008200
TR =0000 00000000 0000ffff 00008b00
GDT=     00000000 0000ffff
IDT=     00000000 0000ffff
CR0=60000010 CR2=00000000 CR3=00000000 CR4=00000000
DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000
DR3=0000000000000000
DR6=00000000ffff0ff0 DR7=0000000000000400
EFER=0000000000000000
Code=00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00


I did a bisect and it seems that the bad commit is
846666fad8d7de79b47a4147e39330fe96e1bdc3 "KVM/x86: Check input paging mode when
cs.l is set".

I have no clue on what exactly is happening but good news is I can reproduce
the bug easily, so I can test a patch if someone provides one :)

Best,
Adrien

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