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[PATCH v5 6/7] x86/cpu-policy: re-arrange no-VMX logic
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 4 Sep 2024 14:29:57 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Wed, 04 Sep 2024 12:30:01 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Move the PKS check into an "else" for the corresponding "if()", such
that further adjustments (like for USER_MSR) can easily be put there as
well.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
v5: Re-base.
v4: New.
--- a/xen/arch/x86/cpu-policy.c
+++ b/xen/arch/x86/cpu-policy.c
@@ -741,19 +741,20 @@ static void __init calculate_hvm_max_pol
if ( !cpu_has_vmx_xsaves )
__clear_bit(X86_FEATURE_XSAVES, fs);
}
+ else
+ {
+ /*
+ * Xen doesn't use PKS, so the guest support for it has opted to not
use
+ * the VMCS load/save controls for efficiency reasons. This depends on
+ * the exact vmentry/exit behaviour, so don't expose PKS in other
+ * situations until someone has cross-checked the behaviour for safety.
+ */
+ __clear_bit(X86_FEATURE_PKS, fs);
+ }
if ( !cpu_has_vmx_msrlist )
__clear_bit(X86_FEATURE_MSRLIST, fs);
- /*
- * Xen doesn't use PKS, so the guest support for it has opted to not use
- * the VMCS load/save controls for efficiency reasons. This depends on
- * the exact vmentry/exit behaviour, so don't expose PKS in other
- * situations until someone has cross-checked the behaviour for safety.
- */
- if ( !cpu_has_vmx )
- __clear_bit(X86_FEATURE_PKS, fs);
-
/*
* Make adjustments to possible (nested) virtualization features exposed
* to the guest
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