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From: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
To: linux-pci@vger.kernel.org,
	Jon Derrick <jonathan.derrick@intel.com>,
	iommu@lists.linux-foundation.org
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	Joerg Roedel <joro@8bytes.org>,
	Nirmal Patel <nirmal.patel@intel.com>,
	Kapil Karkra <kapil.karkra@intel.com>,
	Bjorn Helgaas <helgaas@kernel.org>,
	Krzysztof Wilczynski <kw@linux.com>,
	Lu Baolu <baolu.lu@linux.intel.com>
Subject: Re: [PATCH v4 0/2] VMD MSI Remapping Bypass
Date: Mon, 22 Mar 2021 14:11:00 +0000	[thread overview]
Message-ID: <161642217049.2836.9881489151722165383.b4-ty@arm.com> (raw)
In-Reply-To: <20210210161315.316097-1-jonathan.derrick@intel.com>

On Wed, 10 Feb 2021 09:13:13 -0700, Jon Derrick wrote:
> The Intel Volume Management Device acts similar to a PCI-to-PCI bridge in that
> it changes downstream devices' requester-ids to its own. As VMD supports PCIe
> devices, it has its own MSI-X table and transmits child device MSI-X by
> remapping child device MSI-X and handling like a demultiplexer.
> 
> Some newer VMD devices (Icelake Server) have an option to bypass the VMD MSI-X
> remapping table. This allows for better performance scaling as the child device
> MSI-X won't be limited by VMD's MSI-X count and IRQ handler.
> 
> [...]

Applied to pci/vmd, thanks!

[1/2] iommu/vt-d: Use Real PCI DMA device for IRTE
      https://git.kernel.org/lpieralisi/pci/c/9b4a824b88
[2/2] PCI: vmd: Disable MSI-X remapping when possible
      https://git.kernel.org/lpieralisi/pci/c/ee81ee84f8

Thanks,
Lorenzo

      parent reply	other threads:[~2021-03-22 14:11 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-10 16:13 Jon Derrick
2021-02-10 16:13 ` [PATCH v4 1/2] iommu/vt-d: Use Real PCI DMA device for IRTE Jon Derrick
2021-02-10 16:13 ` [PATCH v4 2/2] PCI: vmd: Disable MSI-X remapping when possible Jon Derrick
2021-03-17 19:14 ` [PATCH v4 0/2] VMD MSI Remapping Bypass Derrick, Jonathan
2021-03-18  9:07   ` joro
2021-03-18 12:38     ` Lorenzo Pieralisi
2021-03-22 14:11 ` Lorenzo Pieralisi [this message]

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