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Re: [Xen-devel] [PATCH for-4.12] passthrough/vtd: Drop the "workaround_bios_bug" logic entirely
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxx>
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Fri, 22 Mar 2019 07:07:50 +0100
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- Cc: Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>, Kevin Tian <kevin.tian@xxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, Paul Durrant <paul.durrant@xxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Fri, 22 Mar 2019 06:08:09 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 21/03/2019 21:26, Andrew Cooper wrote:
> It turns out that this code was previously dead.
>
> c/s dcf41790 " x86/mmcfg/drhd: Move acpi_mmcfg_init() call before calling
> acpi_parse_dmar()" resulted in PCI segment 0 now having been initialised
> enough for acpi_parse_one_drhd() to not take the
>
> /* Skip checking if segment is not accessible yet. */
>
> path unconditionally. However, some systems have DMAR tables which list
> devices which are disabled by user choice (in particular, Dell PowerEdge R740
> with I/O AT DMA disabled), and turning off all IOMMU functionality in this
> case is entirely unhelpful behaviour.
>
> Leave the warning which identifies the problematic devices, but drop the
> remaining logic. This leaves the system in better overall state, and working
> in the same way that it did in previous releases.
>
> Reported-by: Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Release-acked-by: Juergen Gross <jgross@xxxxxxxx>
Juergen
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