[xen staging] x86/cpuid: gate the hypervisor PV-only leaf on is_pv_domain()

[patchbot@xxxxxxx]

commit bf8a74a3e107044eafd7174cf21286cda8f45c66
Author:     Jiaqing Zhao <Zhao.Jiaqing@xxxxxxx>
AuthorDate: Wed Aug 26 14:14:20 2026 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Aug 26 14:14:20 2026 +0200

    x86/cpuid: gate the hypervisor PV-only leaf on is_pv_domain()
    
    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>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 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;
--
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