linux-kernel - Re: [PART2 PATCH v6 12/12] svm: Implements update_pi

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Date:   Fri, 19 Aug 2016 17:04:06 +0200
From:   Radim Krčmář <rkrcmar@...hat.com>
To:     Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
Cc:     joro@...tes.org, pbonzini@...hat.com, alex.williamson@...hat.com,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        sherry.hurwitz@....com
Subject: Re: [PART2 PATCH v6 12/12] svm: Implements update_pi_irte hook to
 setup posted interrupt

2016-08-19 16:49+0200, Radim Krčmář:
>   Minor design note:
>   To make the usage of "struct amd_ir_data" safer, we could pass "struct
>   list_head" into irq_set_vcpu_affinity(), instead of returning "struct
>   amd_ir_data *".
> 
>   irq_set_vcpu_affinity() would add "struct amd_ir_data" to the list only
>   if ir_data was not already in some list and report whether the list
>   was modified.

No, this would not simplify the search.  An important point of list_head
in amd_ir_data was to let us know the current list.