[PATCH qemu-server] fix #7981: cpu flags: Hyper-V enlightenments on x86_64 only

[Erik Fastermann <e.fastermann@proxmox.com>]

'hv-passthrough' is x86-only, so QEMU's ARM target rejects it with
"Parameter 'model.props.hv-passthrough' is unexpected". The whole
expansion then fails, leaving pvestatd unable to populate the
cpuflags-kvm node key on aarch64 hosts. Guard with the arch to prevent
this.

Fixes: 698550c2 ("cpu flags: include Hyper-V enlightenment flags in supported flags")

Signed-off-by: Erik Fastermann <e.fastermann@proxmox.com>
---
 src/PVE/QemuServer.pm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/PVE/QemuServer.pm b/src/PVE/QemuServer.pm
index 63d8c135..0e3ab288 100644
--- a/src/PVE/QemuServer.pm
+++ b/src/PVE/QemuServer.pm
@@ -3023,7 +3023,7 @@ sub query_supported_cpu_flags {
         die "QEMU flag querying VM exited with code " . $rc if $rc;
 
         my $model = { name => $kvm ? 'host' : 'max' };
-        $model->{props} = { 'hv-passthrough' => JSON::true } if $kvm;
+        $model->{props} = { 'hv-passthrough' => JSON::true } if $kvm && $arch eq 'x86_64';
 
         eval {
             my $cmd_result = mon_cmd(
-- 
2.47.3