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From:   "Tian, Kevin" <kevin.tian@intel.com>
To:     Lu Baolu <baolu.lu@linux.intel.com>,
        Joerg Roedel <joro@8bytes.org>,
        "Steve Wahl" <steve.wahl@hpe.com>
CC:     David Woodhouse <dwmw2@infradead.org>,
        Jerry Snitselaar <jsnitsel@redhat.com>,
        Mike Travis <mike.travis@hpe.com>,
        Dimitri Sivanich <sivanich@hpe.com>,
        "Anderson, Russ" <russ.anderson@hpe.com>,
        "iommu@lists.linux.dev" <iommu@lists.linux.dev>,
        "iommu@lists.linux-foundation.org" <iommu@lists.linux-foundation.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH v1 6/6] iommu/vt-d: Make DMAR_UNITS_SUPPORTED default 1024
Thread-Topic: [PATCH v1 6/6] iommu/vt-d: Make DMAR_UNITS_SUPPORTED default
 1024
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Date:   Thu, 30 Jun 2022 08:30:26 +0000
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References: <20220625125204.2199437-1-baolu.lu@linux.intel.com>
 <20220625125204.2199437-7-baolu.lu@linux.intel.com>
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> From: Lu Baolu <baolu.lu@linux.intel.com>
> Sent: Saturday, June 25, 2022 8:52 PM
>=20
> If the available hardware exceeds DMAR_UNITS_SUPPORTED (previously set
> to MAX_IO_APICS, or 128), it causes these messages: "DMAR: Failed to
> allocate seq_id", "DMAR: Parse DMAR table failure.", and "x2apic: IRQ
> remapping doesn't support X2APIC mode x2apic disabled"; and the system
> fails to boot properly.
>=20
> To support up to 64 sockets with 10 DMAR units each (640), make the
> value of DMAR_UNITS_SUPPORTED default 1024.
>=20
> Signed-off-by: Steve Wahl<steve.wahl@hpe.com>
> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>

Reviewed-by: Kevin Tian <kevin.tian@intel.com>