linux-kernel - Re: [PATCH] PCI: vmd: Remove MSI-X check on child devices

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Message-ID: <20250811055343.GA1405254-ammarfaizi2@gnuweeb.org>
Date: Mon, 11 Aug 2025 12:53:43 +0700
From: Ammar Faizi <ammarfaizi2@...weeb.org>
To: Nam Cao <namcao@...utronix.de>
Cc: Nirmal Patel <nirmal.patel@...ux.intel.com>,
	Jonathan Derrick <jonathan.derrick@...ux.dev>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kwilczynski@...nel.org>,
	Manivannan Sadhasivam <mani@...nel.org>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, Armando Budianto <sprite@...weeb.org>,
	Alviro Iskandar Setiawan <alviro.iskandar@...weeb.org>
Subject: Re: [PATCH] PCI: vmd: Remove MSI-X check on child devices

On Mon, Aug 11, 2025 at 07:39:35AM +0200, Nam Cao wrote:
> Commit d7d8ab87e3e7 ("PCI: vmd: Switch to msi_create_parent_irq_domain()")
> added a WARN_ON sanity check that child devices support MSI-X, because VMD
> document says [1]:
> 
>     "Intel VMD only supports MSIx Interrupts from child devices and
>     therefore the BIOS must enable PCIe Hot Plug and MSIx interrups [sic]."
> 
> However, on Ammar's machine, a PCIe port below VMD does not support MSI-X,
> triggering this WARN_ON.
> 
> This inconsistency between the document and reality should be investigated
> further. For now, remove the MSI-X check.

Posting the processor model in question here for Intel VMD team. It may
help the investigation. The processor model I use is i7-1165G7.

Let me know if you guys need more information from me.

-- 
Ammar Faizi