From: Barret Rhoden via iommu <iommu@lists.linux-foundation.org>
To: Lu Baolu <baolu.lu@linux.intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>,
David Woodhouse <dwmw2@infradead.org>,
Joerg Roedel <joro@8bytes.org>, Yian Chen <yian.chen@intel.com>,
Sohil Mehta <sohil.mehta@intel.com>
Cc: iommu@lists.linux-foundation.org, x86@kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/3] iommu/vt-d bad RMRR workarounds
Date: Fri, 13 Dec 2019 09:31:36 -0500 [thread overview]
Message-ID: <8a530d5c-22e1-3c2f-98df-45028cc6c771@google.com> (raw)
In-Reply-To: <35f49464-0ce5-9998-12a0-624d9683ea18@linux.intel.com>
On 12/11/19 9:43 PM, Lu Baolu wrote:
> The VT-d spec defines the BIOS considerations about RMRR in section 8.4:
>
> "
> BIOS must report the RMRR reported memory addresses as reserved (or as
> EFI runtime) in the system memory map returned through methods such as
> INT15, EFI GetMemoryMap etc.
> "
>
> So we should treat it as firmware bug if the RMRR range is not mapped as
> RESERVED in the system memory map table.
>
> As for how should the driver handle this case, ignoring buggy RMRR with
> a warning message might be a possible choice.
Agreed, firmware should not be doing this. My first patch just skips
those entries, instead of aborting DMAR processing, and keeps the warning.
So long as the machine still boots in a safe manner, I'm reasonably happy.
Thanks,
Barret
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next prev parent reply other threads:[~2019-12-13 21:37 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-11 19:46 [PATCH 0/3] iommu/vt-d bad RMRR workarounds Barret Rhoden via iommu
2019-12-11 19:46 ` [PATCH 1/3] iommu/vt-d: skip RMRR entries that fail the sanity check Barret Rhoden via iommu
2019-12-16 19:07 ` Chen, Yian
2019-12-16 19:35 ` Barret Rhoden via iommu
2019-12-17 19:19 ` Chen, Yian
2019-12-23 20:27 ` Barret Rhoden via iommu
2019-12-11 19:46 ` [PATCH 2/3] iommu/vt-d: treat unmapped RMRR entries as sane Barret Rhoden via iommu
2019-12-11 19:46 ` [PATCH 3/3] iommu/vt-d: skip invalid RMRR entries Barret Rhoden via iommu
2019-12-12 2:43 ` [PATCH 0/3] iommu/vt-d bad RMRR workarounds Lu Baolu
2019-12-13 14:31 ` Barret Rhoden via iommu [this message]
2019-12-14 1:52 ` Lu Baolu
2019-12-16 19:11 ` Chen, Yian
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