Re: [Xen-devel] [PATCH v7 14/28] xen/arm: ITS: Initialize physical ITS and export lpi support

[Vijay Kilari <vijay.kilari@xxxxxxxxx>]

On Mon, Sep 21, 2015 at 8:50 PM, Julien Grall <julien.grall@xxxxxxxxxx> wrote:
> Hi Vijay,
>
> On 18/09/15 14:09, vijay.kilari@xxxxxxxxx wrote:
>> From: Vijaya Kumar K <Vijaya.Kumar@xxxxxxxxxxxxxxxxxx>
>>
>> Initialize physical ITS if HW supports LPIs.
>>
>> Signed-off-by: Vijaya Kumar K <Vijaya.Kumar@xxxxxxxxxxxxxxxxxx>
>> ---
>> v7: - Export lpi support information to vgic-v3 driver from gic-v3.
>>     - Drop gic_lpi_supported() helper function
>>     - Add boot param to enable or disable physical ITS
>> v6: - Updated lpi_supported gic_info member for GICv2 and GICv3
>>     - Introduced helper gic_lpi_supported() and exported
>> v5: - Made check of its dt node availability before
>>       setting lpi_supported flag
>> ---
>>  xen/arch/arm/gic-v3.c             |   38 
>> ++++++++++++++++++++++++++++++++++---
>>  xen/arch/arm/vgic-v3.c            |    5 ++++-
>>  xen/include/asm-arm/gic_v3_defs.h |    4 +++-
>>  xen/include/asm-arm/vgic.h        |    2 +-
>>  4 files changed, 43 insertions(+), 6 deletions(-)
>>
>> diff --git a/xen/arch/arm/gic-v3.c b/xen/arch/arm/gic-v3.c
>> index c4c77a7..ac8a0ea 100644
>> --- a/xen/arch/arm/gic-v3.c
>> +++ b/xen/arch/arm/gic-v3.c
>> @@ -55,6 +55,18 @@ static struct {
>>  } gicv3;
>>
>>  static struct gic_info gicv3_info;
>> +/* Enable/Disable ITS support */
>> +static bool_t its_enable  = 1;
>> +/* Availability of ITS support after successful ITS initialization */
>> +static bool_t its_enabled = 0;
>> +
>> +static void __init parse_its_param(char *s)
>> +{
>> +    if ( !parse_bool(s) )
>> +        its_enable = 0;
>> +}
>> +
>> +custom_param("its", parse_its_param);
>
> Why do you need a command line option to enable/disable the physical ITS?

I have added this to remove ITS support?.
Did I misunderstood it. May be I have to avoid generating its dt node
to disable its for dom0?

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