linux-kernel - Re: [RFC PATCH v2 01/18] genirq/msi: Provide DOMAIN_BUS_MSI

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Message-ID:
 <TY1PPFCDFFFA68AD67F6ABDD2F9F9644526F31AA@TY1PPFCDFFFA68A.apcprd02.prod.outlook.com>
Date: Tue, 30 Sep 2025 16:25:13 +0800
From: "Nutty.Liu" <nutty.liu@...mail.com>
To: Andrew Jones <ajones@...tanamicro.com>, iommu@...ts.linux.dev,
 kvm-riscv@...ts.infradead.org, kvm@...r.kernel.org,
 linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc: jgg@...dia.com, zong.li@...ive.com, tjeznach@...osinc.com,
 joro@...tes.org, will@...nel.org, robin.murphy@....com, anup@...infault.org,
 atish.patra@...ux.dev, tglx@...utronix.de, alex.williamson@...hat.com,
 paul.walmsley@...ive.com, palmer@...belt.com, alex@...ti.fr
Subject: Re: [RFC PATCH v2 01/18] genirq/msi: Provide DOMAIN_BUS_MSI_REMAP

On 9/21/2025 4:38 AM, Andrew Jones wrote:
> Provide a domain bus token for the upcoming support for the RISC-V
> IOMMU interrupt remapping domain, which needs to be distinguished
> from NEXUS domains. The new token name is generic, as the only
> information that needs to be conveyed is that the IRQ domain will
> remap MSIs, i.e. there's nothing RISC-V specific to convey.
>
> Since the MSI_REMAP domain implements init_dev_msi_info() with
> msi_parent_init_dev_msi_info(), which makes 'domain' point to
> the NEXUS domain, while keeping 'msi_parent_domain' pointing to
> itself, there's nothing to do in msi-lib to add support except
> to accept the token.
>
> Signed-off-by: Andrew Jones <ajones@...tanamicro.com>
> ---
>   drivers/irqchip/irq-msi-lib.c  | 8 ++++----
>   include/linux/irqdomain_defs.h | 1 +
>   2 files changed, 5 insertions(+), 4 deletions(-)
Reviewed-by: Nutty Liu <nutty.liu@...mail.com>

Thanks,
Nutty