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[PATCH] x86/cpuid: gate the hypervisor PV-only leaf on is_pv_domain()
- To: <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jiaqing Zhao <Zhao.Jiaqing@xxxxxxx>
- Date: Wed, 26 Aug 2026 15:25:26 +0800
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- Cc: Teddy Astie <teddy.astie@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Jiaqing Zhao <Zhao.Jiaqing@xxxxxxx>, Roger Pau Monné <roger@xxxxxxxxxxxxxx>
- Delivery-date: Wed, 26 Aug 2026 07:26:26 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Hypervisor leaf 5 is PV-specific, but is gated with !is_hvm_domain(),
which stays a runtime test in a build without PV support. Test for a
PV domain directly so the compiler can discard the leaf when
CONFIG_PV is disabled.
Suggested-by: Roger Pau Monné <roger@xxxxxxxxxxxxxx>
Signed-off-by: Jiaqing Zhao <Zhao.Jiaqing@xxxxxxx>
---
xen/arch/x86/cpuid.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/xen/arch/x86/cpuid.c b/xen/arch/x86/cpuid.c
index 6e9b15c9c3..a9aeb2d268 100644
--- a/xen/arch/x86/cpuid.c
+++ b/xen/arch/x86/cpuid.c
@@ -157,7 +157,7 @@ static void cpuid_hypervisor_leaves(const struct vcpu *v,
uint32_t leaf,
break;
case 5: /* PV-specific parameters */
- if ( is_hvm_domain(d) || subleaf != 0 )
+ if ( !is_pv_domain(d) || subleaf != 0 )
break;
res->b = flsl(get_upper_mfn_bound()) + PAGE_SHIFT;
--
2.53.0
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