linux-kernel - Re: [PATCH v2] iommu/vt-d: Allocate DMAR fault interrupts locally

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Date: Wed, 24 Apr 2024 11:43:30 +0800
From: Baolu Lu <baolu.lu@...ux.intel.com>
To: Dimitri Sivanich <sivanich@....com>, Thomas Gleixner
 <tglx@...utronix.de>, Joerg Roedel <joro@...tes.org>,
 Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
 Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
 David Woodhouse <dwmw2@...radead.org>, Mark Rutland <mark.rutland@....com>,
 Peter Zijlstra <peterz@...radead.org>, Arnd Bergmann <arnd@...db.de>,
 YueHaibing <yuehaibing@...wei.com>, iommu@...ts.linux.dev
Cc: baolu.lu@...ux.intel.com, linux-kernel@...r.kernel.org,
 Steve Wahl <steve.wahl@....com>, Russ Anderson <russ.anderson@....com>
Subject: Re: [PATCH v2] iommu/vt-d: Allocate DMAR fault interrupts locally

On 3/22/24 4:50 AM, Dimitri Sivanich wrote:
> The Intel IOMMU code currently tries to allocate all DMAR fault interrupt
> vectors on the boot cpu.  On large systems with high DMAR counts this
> results in vector exhaustion, and most of the vectors are not initially
> allocated socket local.
> 
> Instead, have a cpu on each node do the vector allocation for the DMARs on
> that node.  The boot cpu still does the allocation for its node during its
> boot sequence.
> 
> Signed-off-by: Dimitri Sivanich<sivanich@....com>
> ---
> 
> v2: per Thomas Gleixner, implement this from a DYN CPU hotplug state, though
>      this implementation runs in CPUHP_AP_ONLINE_DYN space rather than
>      CPUHP_BP_PREPARE_DYN space.

Patch has been queued for iommu/vt-d.

Best regards,
baolu