[xen staging] x86: Conditionalise PV-only fallback branches on CONFIG_PV

[patchbot@xxxxxxx]

commit d6d76a493984307c3d4b6ff7742448761f711e1a
Author:     Alejandro Vallejo <alejandro.garciavallejo@xxxxxxx>
AuthorDate: Thu Nov 20 11:23:56 2025 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Nov 20 11:23:56 2025 +0100

    x86: Conditionalise PV-only fallback branches on CONFIG_PV
    
    A couple of branches rely on PV being the "else" branch, making it
    be compiled even when PV support is not itself compiled-in.
    
    Add a explicit conditional on CONFIG_PV in those cases to remove the
    code in !CONFIG_PV builds.
    
    Not a functional change.
    
    Signed-off-by: Alejandro Vallejo <alejandro.garciavallejo@xxxxxxx>
    Reviewed-by: Teddy Astie <teddy.astie@xxxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/cpuid.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/xen/arch/x86/cpuid.c b/xen/arch/x86/cpuid.c
index b63a82dd38..5decfad8cd 100644
--- a/xen/arch/x86/cpuid.c
+++ b/xen/arch/x86/cpuid.c
@@ -297,6 +297,8 @@ void guest_cpuid(const struct vcpu *v, uint32_t leaf,
             if ( v->arch.hvm.guest_cr[4] & X86_CR4_OSXSAVE )
                 res->c |= cpufeat_mask(X86_FEATURE_OSXSAVE);
         }
+        else if ( !IS_ENABLED(CONFIG_PV) )
+            ASSERT_UNREACHABLE();
         else /* PV domain */
         {
             regs = guest_cpu_user_regs();
@@ -509,6 +511,8 @@ void guest_cpuid(const struct vcpu *v, uint32_t leaf,
             if ( !hap_enabled(d) && !hvm_pae_enabled(v) )
                 res->d &= ~cpufeat_mask(X86_FEATURE_PSE36);
         }
+        else if ( !IS_ENABLED(CONFIG_PV) )
+            ASSERT_UNREACHABLE();
         else /* PV domain */
         {
             /*
--
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