Hi Baoquan, > -----Original Message----- > From: Baoquan He <b...@redhat.com> > Sent: Wednesday, September 23, 2020 10:33 AM > To: j...@8bytes.org; Adrian Huang12 <ahuan...@lenovo.com> > Cc: iommu@lists.linux-foundation.org; linux-ker...@vger.kernel.org; > jsnit...@redhat.com > Subject: [External] Re: [PATCH] Revert "iommu/amd: Treat per-device exclusion > ranges as r/w unity-mapped regions" > > Forgot CC-ing Jerry, add him. > > On 09/23/20 at 10:26am, Baoquan He wrote: > > A regression failure of kdump kernel boot was reported on a HPE system. > > Bisect points at commit 387caf0b759ac43 ("iommu/amd: Treat per-device > > exclusion ranges as r/w unity-mapped regions") as criminal. Reverting > > it fix the failure. > > > > With the commit, kdump kernel will always print below error message, > > then naturally AMD iommu can't function normally during kdump kernel > bootup. > > > > ~~~~~~~~~ > > AMD-Vi: [Firmware Bug]: IVRS invalid checksum > > > > Why commit 387caf0b759ac43 causing it haven't been made clear. > > Hi Joerg, Adrian > > We only have one machine which can reproduce the issue, it's a gen10-01 of > HPE. If any log or info are needed, please let me know, I can attach here.
Could you please provide the following info? 1. The booting log for both system kernel and kdump kernel by appending the kernel parameter 'amd_iommu_dump' 2. ACPI table (# acpidump > acpi-table) -> Send out the file 'acpi-table'. -- Adrian _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu