From: Paolo Bonzini <pbonzini@redhat.com>
To: Maxime Coquelin <maxime.coquelin@redhat.com>,
Peter Xu <peterx@redhat.com>,
qemu-devel@nongnu.org
Cc: Jason Wang <jasowang@redhat.com>,
"Michael S . Tsirkin" <mst@redhat.com>,
David Gibson <david@gibson.dropbear.id.au>
Subject: Re: [Qemu-devel] [PATCH 0/4] exec: address space translation cleanups
Date: Tue, 16 May 2017 18:54:24 +0200 [thread overview]
Message-ID: <28bdbe39-7520-28c1-e58e-ec9f7ed69bde@redhat.com> (raw)
In-Reply-To: <f69dcf32-b6a2-fb59-2b54-61fd7b52e66e@redhat.com>
On 16/05/2017 18:51, Maxime Coquelin wrote:
>>
>> I faced the problem the old patch fixes when declaring and attaching
>> an IOMMU device, but booting the kernel with intel_iommu=off.
>>
>> I tested again with patches 1 & 4 of your series, and I confirm it
>> fixes the issue:
>> Tested-by: Maxime Coquelin <maxime.coquelin@redhat.com>
>
> I did some more testing with my "vhost-user IOMMU" setup, and the series
> actually breaks with IOMMU device attached, and intel_iommu=on.
>
> The main difference with the previous passing test is the guest RAM
> size. In the working setup, it is 2G of 2M hugepages, vs. 4G of 2M
> hugepages in the failing one. Note that I also reproduce with
> vhost-kernel backend.
>
> The error happens in the first vhost_device_iotlb_miss() call:
> qemu-system-x86_64: Fail to lookup the translated address b5d7c000
>
> I don't have the root cause yet, I'll keep you updated.
I suppose it is patch 4?
Paolo
next prev parent reply other threads:[~2017-05-16 16:54 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-15 8:50 [Qemu-devel] [PATCH 0/4] exec: address space translation cleanups Peter Xu
2017-05-15 8:50 ` [Qemu-devel] [PATCH 1/4] exec: simplify phys_page_find() params Peter Xu
2017-05-16 2:53 ` David Gibson
2017-05-16 10:02 ` Paolo Bonzini
2017-05-15 8:50 ` [Qemu-devel] [PATCH 2/4] exec: rename resolve_subpage Peter Xu
2017-05-15 9:03 ` Paolo Bonzini
2017-05-15 12:16 ` Peter Xu
2017-05-15 8:50 ` [Qemu-devel] [PATCH 3/4] exec: further use is_mmio Peter Xu
2017-05-15 9:04 ` Paolo Bonzini
2017-05-15 9:29 ` Peter Xu
2017-05-15 8:51 ` [Qemu-devel] [PATCH 4/4] exec: abstract address_space_do_translate() Peter Xu
2017-05-16 13:24 ` [Qemu-devel] [PATCH 0/4] exec: address space translation cleanups Maxime Coquelin
2017-05-16 16:51 ` Maxime Coquelin
2017-05-16 16:54 ` Paolo Bonzini [this message]
2017-05-16 17:01 ` Maxime Coquelin
2017-05-17 4:23 ` Peter Xu
2017-05-17 5:57 ` Peter Xu
2017-05-17 7:17 ` Maxime Coquelin
2017-05-17 7:26 ` Paolo Bonzini
2017-05-17 8:38 ` Peter Xu
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