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RE: [PATCH for-4.17 v2] hvm/apic: repurpose the reporting of the APIC assist options
- To: Paul Durrant <xadimgnik@xxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Henry Wang <Henry.Wang@xxxxxxx>
- Date: Sat, 5 Nov 2022 01:43:13 +0000
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- Cc: Wei Liu <wl@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>, Kevin Tian <kevin.tian@xxxxxxxxx>
- Delivery-date: Sat, 05 Nov 2022 01:43:52 +0000
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- Thread-topic: [PATCH for-4.17 v2] hvm/apic: repurpose the reporting of the APIC assist options
Hi Roger,
> Subject: Re: [PATCH for-4.17 v2] hvm/apic: repurpose the reporting of the
> APIC assist options
>
> On 04/11/2022 16:18, Roger Pau Monne wrote:
> > The current reporting of the hardware assisted APIC options is done by
> > checking "virtualize APIC accesses" which is not very helpful, as that
> > feature doesn't avoid a vmexit, instead it does provide some help in
> > order to detect APIC MMIO accesses in vmexit processing.
> >
> > Repurpose the current reporting of xAPIC assistance to instead report
> > such feature as present when there's support for "TPR shadow" and
> > "APIC register virtualization" because in that case some xAPIC MMIO
> > register accesses are handled directly by the hardware, without
> > requiring a vmexit.
> >
> > For symetry also change assisted x2APIC reporting to require
> > "virtualize x2APIC mode" and "APIC register virtualization", dropping
> > the option to also be reported when "virtual interrupt delivery" is
> > available. Presence of the "virtual interrupt delivery" feature will
> > be reported using a different option.
> >
> > Fixes: 2ce11ce249 ('x86/HVM: allow per-domain usage of hardware
> virtualized APIC')
> > Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
> > ---
> > Changes since v1:
> > - Fix Viridian MSR tip conditions.
>
> Reviewed-by: Paul Durrant <paul@xxxxxxx>
Release-acked-by: Henry Wang <Henry.Wang@xxxxxxx>
Kind regards,
Henry
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