Re: [PATCH v6 11/12] Let host know whether the guest can handle asyncPF in non-userspace context.

[Avi Kivity]

 On 10/04/2010 05:56 PM, Gleb Natapov wrote:
> If guest can detect that it runs in non-preemptable context it can
> handle async PFs at any time, so let host know that it can send async
> PF even if guest cpu is not in userspace.
>
>
>
>   MSR_KVM_ASYNC_PF_EN: 0x4b564d02
>   	data: Bits 63-6 hold 64-byte aligned physical address of a 32bit memory
> -	area which must be in guest RAM. Bits 5-1 are reserved and should be
> +	area which must be in guest RAM. Bits 5-2 are reserved and should be
>   	zero. Bit 0 is 1 when asynchronous page faults are enabled on the vcpu
> -	0 when disabled.
> +	0 when disabled. Bit 2 is 1 if asynchronous page faults can be injected
> +	when vcpu is in kernel mode.

Please use cpl instead of user mode and kernel mode.  The original terms 
are ambiguous for cpl ==1 || cpl == 2.

--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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