From: Lu Baolu <baolu.lu@linux.intel.com> To: Barret Rhoden <brho@google.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: baolu.lu@linux.intel.com, 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: Sat, 14 Dec 2019 09:52:50 +0800 [thread overview] Message-ID: <02d69d9a-9c45-d9e7-4c1a-cb5e50590c47@linux.intel.com> (raw) In-Reply-To: <8a530d5c-22e1-3c2f-98df-45028cc6c771@google.com> On 12/13/19 10:31 PM, Barret Rhoden wrote: > 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. > Hi Yian, Does this work for you? Best regards, baolu > So long as the machine still boots in a safe manner, I'm reasonably happy. > > Thanks, > > Barret > >
WARNING: multiple messages have this Message-ID (diff)
From: Lu Baolu <baolu.lu@linux.intel.com> To: Barret Rhoden <brho@google.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: Sat, 14 Dec 2019 09:52:50 +0800 [thread overview] Message-ID: <02d69d9a-9c45-d9e7-4c1a-cb5e50590c47@linux.intel.com> (raw) In-Reply-To: <8a530d5c-22e1-3c2f-98df-45028cc6c771@google.com> On 12/13/19 10:31 PM, Barret Rhoden wrote: > 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. > Hi Yian, Does this work for you? Best regards, baolu > So long as the machine still boots in a safe manner, I'm reasonably happy. > > Thanks, > > Barret > > _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
next prev parent reply other threads:[~2019-12-14 1:53 UTC|newest] Thread overview: 24+ 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 2019-12-11 19:46 ` 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 2019-12-11 19:46 ` Barret Rhoden via iommu 2019-12-16 19:07 ` Chen, Yian 2019-12-16 19:07 ` Chen, Yian 2019-12-16 19:35 ` Barret Rhoden 2019-12-16 19:35 ` Barret Rhoden via iommu 2019-12-17 19:19 ` Chen, Yian 2019-12-17 19:19 ` Chen, Yian 2019-12-23 20:27 ` Barret Rhoden 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 2019-12-11 19:46 ` Barret Rhoden via iommu 2019-12-11 19:46 ` [PATCH 3/3] iommu/vt-d: skip invalid RMRR entries Barret Rhoden 2019-12-11 19:46 ` Barret Rhoden via iommu 2019-12-12 2:43 ` [PATCH 0/3] iommu/vt-d bad RMRR workarounds Lu Baolu 2019-12-12 2:43 ` Lu Baolu 2019-12-13 14:31 ` Barret Rhoden 2019-12-13 14:31 ` Barret Rhoden via iommu 2019-12-14 1:52 ` Lu Baolu [this message] 2019-12-14 1:52 ` Lu Baolu 2019-12-16 19:11 ` Chen, Yian 2019-12-16 19:11 ` Chen, Yian
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