From: Paolo Bonzini <bonzini@gnu•org>
To: David Woodhouse <dwmw2@infradead•org>, Qian Cai <cai@redhat•com>,
x86@kernel•org, Thomas Gleixner <tglx@linutronix•de>,
Tom Murphy <murphyt7@tcd•ie>
Cc: kvm <kvm@vger•kernel.org>,
iommu@lists•linux-foundation.org, joro@8bytes•org,
linux-kernel <linux-kernel@vger•kernel.org>,
linux-hyperv@vger•kernel.org, maz@misterjones•org,
Dexuan Cui <decui@microsoft•com>,
Stephen Rothwell <sfr@canb•auug.org.au>,
Linux Next Mailing List <linux-next@vger•kernel.org>
Subject: Re: [PATCH v3 19/35] x86/io_apic: Cleanup trigger/polarity helpers
Date: Tue, 10 Nov 2020 17:26:21 +0100 [thread overview]
Message-ID: <e213d85f-b29b-e663-29db-10d987feb8d7@gnu.org> (raw)
In-Reply-To: <23e0a29faad5a9cc43582ba7d40a3073f2fb8c87.camel@infradead.org>
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
prev parent reply other threads:[~2020-11-10 16:26 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <e6601ff691afb3266e365a91e8b221179daf22c2.camel@infradead.org>
[not found] ` <20201024213535.443185-1-dwmw2@infradead.org>
[not found] ` <20201024213535.443185-20-dwmw2@infradead.org>
2020-11-10 6:31 ` [PATCH v3 19/35] x86/io_apic: Cleanup trigger/polarity helpers Qian Cai
2020-11-10 8:59 ` David Woodhouse
2020-11-10 16:26 ` Paolo Bonzini [this message]
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