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

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Date:   Fri, 25 Oct 2019 17:06:30 +0800
From:   Zenghui Yu <yuzenghui@...wei.com>
To:     Marc Zyngier <maz@...nel.org>
CC:     <tglx@...utronix.de>, <jason@...edaemon.net>,
        <kvmarm@...ts.cs.columbia.edu>,
        <linux-arm-kernel@...ts.infradead.org>,
        <wanghaibin.wang@...wei.com>, <jiayanlei@...wei.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] irqchip/gic-v3-its: Use the exact ITSList for VMOVP

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@...wei.com>
> 
> 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