Re: [Bug?] Guest pause because VMPTRLD failed in KVM

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On 10/11/2016 15:10, gong lei wrote:
>    4) The isssue can't be reporduced. I search the Intel VMX sepc about reaseons
> of vmptrld failure:
>    The instruction fails if its operand is not properly aligned, sets
> unsupported physical-address bits, or is equal to the VMXON
>    pointer. In addition, the instruction fails if the 32 bits in memory
> referenced by the operand do not match the VMCS
>    revision identifier supported by this processor.
> 
>    But I can't find any cues from the KVM source code. It seems each
>    error conditions is impossible in theory. :(

Yes, it should not happen. :(

If it's not reproducible, it's really hard to say what it was, except a
random memory corruption elsewhere or even a bit flip (!).

Paolo
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