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Re: [Xen-devel] [PATCH] x86/hvm: always expose x2APIC feature in max HVM cpuid policy
- To: Roger Pau Monne <roger.pau@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 24 Dec 2019 12:23:12 +0000
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- Cc: Wei Liu <wl@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>
- Delivery-date: Tue, 24 Dec 2019 12:23:43 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 24/12/2019 10:18, Roger Pau Monne wrote:
> On hardware without x2APIC support Xen emulated local APIC will
> provide such mode, and hence the feature should be set in the maximum
> HVM cpuid policy.
>
> Not exposing it in the maximum policy results in HVM domains not
> getting such feature exposed unless it's also supported by the
> underlying hardware.
>
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
x2apic has never been exposed via this mechanism, due to its effects on
topology calculations.
It has however always been down to the toolstack to opt in, and Xen
permits this via recalculate_cpuid_policy(), on the expectation that the
toolstack knew what it was doing WRT topology (all evidence actually to
the contrary).
If we're seeing a recent change in behaviour, then it will be from libxc.
~Andrew
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