Re: [PATCH 3/7] kvm: vmx: pass MSR_IA32_SPEC_CTRL and MSR_IA32_PRED_CMD down to the guest

[David Woodhouse]

On Mon, 2018-01-08 at 19:08 +0100, Paolo Bonzini wrote:
> 
> +ÂÂÂÂÂÂÂif (have_spec_ctrl && vmx->spec_ctrl != 0)
> +ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂwrmsrl(MSR_IA32_SPEC_CTRL, vmx->spec_ctrl);
> +

I think this one probably *is* safe even without an 'else lfence',
which means that the CPU can speculate around it, but it wants a
comment explaining that someone has properly analysed it and saying
precisely why.

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