From: Sairaj Kodilkar <sarunkod@amd.com>

Commit b12cb3819 (amd_iommu: Check APIC ID > 255 for XTSup) throws
linking error for the `kvm_enable_x2apic` when kvm is disabled
and Clang is used for compilation.

This issue comes up because Clang does not remove the function callsite
(kvm_enable_x2apic in this case) during optimization when if condition
have variable. Intel IOMMU driver solves this issue by creating separate
if condition for checking variables, which causes call site being
optimized away by virtue of `kvm_irqchip_is_split()` being defined as 0.
Implement same solution for the AMD driver.

Fixes: b12cb3819baf (amd_iommu: Check APIC ID > 255 for XTSup)
Signed-off-by: Sairaj Kodilkar <sarunkod@amd.com>
Signed-off-by: Santosh Shukla <santosh.shukla@amd.com>
Tested-by: Phil Dennis-Jordan <phil@philjordan.eu>
Link: https://lore.kernel.org/r/20241114114509.15350-1-sarunkod@amd.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 hw/i386/amd_iommu.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/hw/i386/amd_iommu.c b/hw/i386/amd_iommu.c
index 13af7211e11..af0f4da1f69 100644
--- a/hw/i386/amd_iommu.c
+++ b/hw/i386/amd_iommu.c
@@ -1657,9 +1657,11 @@ static void amdvi_sysbus_realize(DeviceState *dev, Error **errp)
         error_report("AMD IOMMU with x2APIC confguration requires xtsup=on");
         exit(EXIT_FAILURE);
     }
-    if (s->xtsup && kvm_irqchip_is_split() && !kvm_enable_x2apic()) {
-        error_report("AMD IOMMU xtsup=on requires support on the KVM side");
-        exit(EXIT_FAILURE);
+    if (s->xtsup) {
+        if (kvm_irqchip_is_split() && !kvm_enable_x2apic()) {
+            error_report("AMD IOMMU xtsup=on requires support on the KVM side");
+            exit(EXIT_FAILURE);
+        }
     }
 
     pci_setup_iommu(bus, &amdvi_iommu_ops, s);
-- 
2.47.0