Re: [Xen-devel] [PATCH v7 1/6] x86/domain: remove the 'oos_off' flag

[Jan Beulich <jbeulich@xxxxxxxx>]

On 02.09.2019 17:13, Paul Durrant wrote:
>> From: Jan Beulich <jbeulich@xxxxxxxx>
>> Sent: 02 September 2019 15:54
>>
>> On 02.09.2019 16:21, Paul Durrant wrote:
>>> Yes, the hap part stays put. The 'oos_off' part moves to x86 and arm can
>>> be left alone because it already rejects flags != (hvm | hap).
>>
>> But it may better reject the OOS flag _despite_ having only HVM guests,
>> as long as there's no shadow mode there in the first place.
>>
> 
> The flag will be rejected. As I said (in abbreviated form), the test in the 
> ARM code is:
> 
> if (config->flags != (XEN_DOMCTL_CDF_hvm_guest | XEN_DOMCTL_CDF_hap) )
>       error...
> 
> So, any attempt to set XEN_DOMCTL_CDF_oos_off will already cause an error.

Oh, I'm sorry, I didn't recall that they accept only a single value
here. I'm sorry for the noise then.

Jan

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