linux-kernel - Re: [PATCH 5/6] x86/apic/msi: Use Real PCI DMA device when configuring IRTE

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Message-ID: <20200907143207.GC9474@e121166-lin.cambridge.arm.com>
Date:   Mon, 7 Sep 2020 15:32:07 +0100
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Jon Derrick <jonathan.derrick@...el.com>
Cc:     linux-pci@...r.kernel.org, Bjorn Helgaas <helgaas@...nel.org>,
        Christoph Hellwig <hch@....de>,
        Andrzej Jakowski <andrzej.jakowski@...ux.intel.com>,
        Sushma Kalakota <sushmax.kalakota@...el.com>,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        Andy Shevchenko <andriy.shevchenko@...el.com>
Subject: Re: [PATCH 5/6] x86/apic/msi: Use Real PCI DMA device when
 configuring IRTE

On Tue, Jul 28, 2020 at 01:49:44PM -0600, Jon Derrick wrote:
> VMD retransmits child device MSI/X with the VMD endpoint's requester-id.
> In order to support direct interrupt remapping of VMD child devices,
> ensure that the IRTE is programmed with the VMD endpoint's requester-id
> using pci_real_dma_dev().
> 
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...el.com>
> Signed-off-by: Jon Derrick <jonathan.derrick@...el.com>
> ---
>  arch/x86/kernel/apic/msi.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

I'd need an x86 maintainer ACK on this patch.

Thanks,
Lorenzo

> diff --git a/arch/x86/kernel/apic/msi.c b/arch/x86/kernel/apic/msi.c
> index c2b2911feeef..7ca271b8d891 100644
> --- a/arch/x86/kernel/apic/msi.c
> +++ b/arch/x86/kernel/apic/msi.c
> @@ -189,7 +189,7 @@ int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
>  
>  	init_irq_alloc_info(&info, NULL);
>  	info.type = X86_IRQ_ALLOC_TYPE_MSI;
> -	info.msi_dev = dev;
> +	info.msi_dev = pci_real_dma_dev(dev);
>  
>  	domain = irq_remapping_get_irq_domain(&info);
>  	if (domain == NULL)
> -- 
> 2.27.0
>