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Re: [PATCH v3 5/6] x86/vPIC: vpic_elcr_mask() master bit 2 control
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 6 Dec 2023 08:22:46 +0100
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
- Delivery-date: Wed, 06 Dec 2023 07:22:50 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 05.12.2023 18:29, Roger Pau Monné wrote:
> On Tue, Nov 28, 2023 at 11:35:46AM +0100, Jan Beulich wrote:
>> @@ -387,7 +387,7 @@ static int cf_check vpic_intercept_elcr_
>> if ( dir == IOREQ_WRITE )
>> {
>> /* Some IRs are always edge trig. Slave IR is always level
>> trig. */
>> - data = (*val >> shift) & vpic_elcr_mask(vpic);
>> + data = (*val >> shift) & vpic_elcr_mask(vpic, 1);
>
> Not that it matters much, but I think you could use
> vpic_elcr_mask(vpic, 0) to strictly keep the same behavior as
> before?
Indeed, as also said in the description. Personally I view it as (slightly)
more logical to not mask off ...
>> if ( vpic->is_master )
>> data |= 1 << 2;
>
> Since the bit is forcefully set here anyway.
... and then set the bit, hence why I chose to go with 1.
> Regardless:
>
> Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Thanks.
Jan
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