Messages in this thread | | | Subject | Re: [PATCH v3 19/35] x86/io_apic: Cleanup trigger/polarity helpers | From | Paolo Bonzini <> | Date | Tue, 10 Nov 2020 17:26:21 +0100 |
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On 10/11/20 09:59, David Woodhouse wrote: > Hm, attempting to reproduce this shows something else. Ever since > commit be62dbf554c5 ("iommu/amd: Convert AMD iommu driver to the dma- > iommu api") in 5.5 the following stops working for me: > > $ qemu-system-x86_64 -serial mon:stdio -kernel bzImage -machine q35,accel=kvm,kernel-irqchip=split -m 2G -device amd-iommu,intremap=off -append "console=ttyS0 apic=verbose debug" -display none > > It hasn't got a hard drive but I can watch the SATA interrupts fail as > it probes the CD-ROM: > > [ 7.403327] ata3.00: qc timeout (cmd 0xa1) > [ 7.405980] ata3.00: failed to IDENTIFY (I/O error, err_mask=0x4) > > Adding 'iommu=off' to the kernel command line makes it work again, in > that it correctly panics at the lack of a root file system, quickly.
That might well be a QEMU bug though, AMD emulation is kinda experimental.
Paolo
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