Re: [PATCH v2] irqchip/gic-v3-its: Use the exact ITSList for VMOVP

[Zenghui Yu]

On 2019/10/25 16:24, Marc Zyngier wrote:
> On 2019-10-23 04:46, Zenghui Yu wrote:
> > On a system without Single VMOVP support (say GITS_TYPER.VMOVP == 0),
> > we will map vPEs only on ITSs that will actually control interrupts
> > for the given VM. And when moving a vPE, the VMOVP command will be
> > issued only for those ITSs.
> >
> > But when issuing VMOVPs we seemed fail to present the exact ITSList
> > to ITSs who are actually included in the synchronization operation.
> > The its_list_map we're currently using includes all ITSs in the system,
> > even though some of them don't have the corresponding vPE mapping at all.
> >
> > Introduce get_its_list() to get the per-VM its_list_map, to indicate
> > which ITSs have vPE mappings for the given VM, and use this map as
> > the expected ITSList when building VMOVP. This is hopefully a performance
> > gain not to do some synchronization with those unsuspecting ITSs.
> > And initialize the whole command descriptor to zero at beginning, since
> > the seq_num and its_list should be RES0 when GITS_TYPER.VMOVP == 1.
> >
> > Signed-off-by: Zenghui Yu <yuzenghui@xxxxxxxxxx>
>
> I've applied this as a fix for 5.4. In the future, please cc LKML on all
> IRQ-related patches (as documented in MAINTAINERS).

I got it, thanks.


Zenghui