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Re: [XEN PATCH] x86/hvm: make ACPI PM timer support optional
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Sergiy Kibrik <sergiy_kibrik@xxxxxxxx>
- Date: Mon, 30 Sep 2024 14:03:14 +0300
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Mon, 30 Sep 2024 11:03:31 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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
(if both PV & any emulated device are disabled one would end up with
weird system that can't create any VM).
So that's the idea behind making all these dependencies.
-Sergiy
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