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Re: [XEN PATCH] x86/hvm: make ACPI PM timer support optional
- To: Jan Beulich <jbeulich@xxxxxxxx>, Sergiy Kibrik <sergiy_kibrik@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 30 Sep 2024 12:33:26 +0100
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Mon, 30 Sep 2024 11:33:48 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 30/09/2024 12:27 pm, Jan Beulich wrote:
> On 30.09.2024 13:03, Sergiy Kibrik wrote:
>> 27.09.24 12:44, Jan Beulich:
>>>>>> (probably with X86_PMTIMER option depending on PV)
>>>>> HVM you mean?
>>>>>
>>>> I wanted to do it like this:
>>>>
>>>> --- a/xen/arch/x86/Kconfig
>>>> +++ b/xen/arch/x86/Kconfig
>>>> @@ -386,7 +386,7 @@ config ALTP2M
>>>> If unsure, stay with defaults.
>>>>
>>>> config X86_PMTIMER
>>>> - bool "ACPI PM timer emulation support" if EXPERT
>>>> + bool "ACPI PM timer emulation support" if EXPERT && PV
>>>> default y
>>>> depends on HVM
>>>> help
>>>>
>>>> to allow it to be disabled when PV is on and prevent situation when pvh
>>>> domain can't be created because !PV and hvm domain can't be created
>>>> either without emulated timer.
>>> How does PV matter for this "depends on HVM" setting?
>> Options are dependant on HVM option, because pmtimer & stdvga drivers
>> are part of HVM support code.
>> At the same time these options are allowed to be de-selected when PV/PVH
>> enabled, because only PV/PVH domains can be created when stdvga or
>> pmtimer are disabled
> But PV != PVH.
Furthermore, be aware that there's no such thing as PVH in Xen. It's
toolstack level "branding" for want of a better term.
In Xen, there is PV (ring privileging) and HVM (hardware virt).
PVH is a toolstack level construct which passes a different set of
emulate flags, and doesn't set up qemu (on ioreq server 0) by default.
~Andrew
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