Re: [PATCH v7 24/32] xen/x86: allow disabling all emulated devices inside of Xen

["Roger Pau Monné" <roger.pau@citrix.com>]

El 19/10/15 a les 16.23, Jan Beulich ha escrit:
>>>> On 02.10.15 at 17:48, <roger.pau@citrix.com> wrote:
>> Only allow enabling or disabling all the emulated devices inside of Xen,
>> right now Xen doesn't support enabling specific emulated devices only.
>>
>> Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
>> Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
>> Cc: Jan Beulich <jbeulich@suse.com>
>> Cc: Andrew Cooper <andrew.cooper3@citrix.com>
>> ---
>> Changes since v5:
>>  - Add Andrew Cooper Reviewed-by.
>> ---
>>  xen/arch/x86/domain.c | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
>> index 79182a4..a3b1c9b 100644
>> --- a/xen/arch/x86/domain.c
>> +++ b/xen/arch/x86/domain.c
>> @@ -526,7 +526,8 @@ int arch_domain_create(struct domain *d, unsigned int 
>> domcr_flags,
>>                 d->domain_id, config->emulation_flags);
>>          return -EINVAL;
>>      }
>> -    if ( (is_hvm_domain(d) && config->emulation_flags != XEN_X86_EMU_ALL) ||
>> +    if ( (is_hvm_domain(d) && config->emulation_flags != XEN_X86_EMU_ALL &&
>> +         config->emulation_flags != 0) ||
>>           (is_pv_domain(d) && config->emulation_flags != 0) )
> 
> Would there be any bad in simplifying this to
> 
>     if ( config->emulation_flags != 0 && (!is_hvm_domain(d) || config->emulation_flags != XEN_X86_EMU_ALL) )
> 
> (i.e. allowing flags to be zero for all kinds)?

IMHO I find this harder to read, but I guess that's a question of taste,
I've replaced it with your suggestion.

Roger.


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