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Re: [Qemu-devel] [Bug?] Guest pause because VMPTRLD failed in KVM
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [Bug?] Guest pause because VMPTRLD failed in KVM |
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Date: |
Thu, 17 Nov 2016 13:39:58 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 |
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