Re: [Xen-devel] [PATCH 2/2] x86/dmar: zap DMAR signature for dom0 once in TBOOT case

[Zhenzhong Duan <zhenzhong.duan@xxxxxxxxxx>]

On 2018/8/20 16:44, Andrew Cooper wrote:
> On 20/08/2018 09:30, Jan Beulich wrote:
> > > > > On 20.08.18 at 05:32, <zhenzhong.duan@xxxxxxxxxx> wrote:
> > > When TBOOT enabled, acpi_parse_dmar() zap a copy of DMAR table rather
> > > than the real table, so make it controled by config option based on the
> > > fact that we already have done the real zapping in tboot_parse_dmar_table().
> > Is this just a cosmetic change, or is there any harm done by the extra
> > zapping?
> Before 123c7793797502b222300eb710cd3873dcca41ee, calling it multiple
> times would require an equivalent number of reinstate calls for it to work.
>
> That change went into Xen 4.6, whereas I guess this is a patch being
> upstreamed from Oracles 4.4 patchqueue?
Not for that reason. Patch is for upstream.
tboot_parse_dmar_table() called acpi_dmar_zap() the first time, 
acpi_parse_dmar called it the second time, I thought it's a dup.
Thanks
Zhenzhong

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