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Re: [PATCH] IOMMU: iommu_use_hap_pt() implies CONFIG_HVM
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 31 Jan 2024 12:09:40 +0100
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- Cc: Paul Durrant <paul@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Kevin Tian <kevin.tian@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 31 Jan 2024 11:09:49 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 31.01.2024 11:40, Andrew Cooper wrote:
> On 31/01/2024 9:20 am, Jan Beulich wrote:
>> Allow the compiler a little more room on DCE by moving the compile-time-
>> constant condition into the predicate (from the one place where it was
>> added in an open-coded fashion for XSA-450).
>>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>
> Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Thanks, but ...
> I'm surprised that's happy compiling if it's actually doing anything at
> all, given that it's an unguarded variable reference.
... I'm afraid I don't understand: What "unguarded variable reference"
are you seeing me add? Even if you were talking about the hap_pt_share
struct field (which was accessed before as well) - that's part of
struct domain_iommu no matter what .config has.
Jan
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