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Re: [PATCH] x86: Fix AMD_SVM and INTEL_VMX dependency
- To: Michal Orzel <michal.orzel@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 1 Sep 2025 13:19:21 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 01 Sep 2025 11:19:31 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 01.09.2025 12:43, Michal Orzel wrote:
> Commit e3ed540f2e9f was meant to make AMD_SVM dependent on AMD and
> INTEL_VMX on INTEL. Such dependency should be done using 'depends on'
> and not 'if' next to prompt that deals only with the visibility of the
> given Kconfig option. This makes it impossible to e.g. disable INTEL_VMX
> when INTEL is disabled (option is hidden).
Hmm, yes, just that ...
> --- a/xen/arch/x86/hvm/Kconfig
> +++ b/xen/arch/x86/hvm/Kconfig
> @@ -16,7 +16,8 @@ menuconfig HVM
> if HVM
>
> config AMD_SVM
> - bool "AMD-V" if AMD && EXPERT
> + bool "AMD-V" if EXPERT
> + depends on AMD
> default y
> help
> Enables virtual machine extensions on platforms that implement the
> @@ -25,7 +26,8 @@ config AMD_SVM
> If in doubt, say Y.
>
> config INTEL_VMX
> - bool "Intel VT-x" if INTEL && EXPERT
> + bool "Intel VT-x" if EXPERT
> + depends on INTEL
> default y
> select ARCH_VCPU_IOREQ_COMPLETION
> help
... now it becomes impossible to _enable_ INTEL_VMX when INTEL is disabled,
yet which may be of interest if you target some other vendor's VMX
implementation. Perhaps really we should have
config INTEL_VMX
bool "Intel VT-x" if EXPERT
default INTEL
?
Jan
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