diff --git a/docs/misc/xen-command-line.pandoc b/docs/misc/xen-command-line.pandoc
index ef3c737189..93c2a73f4a 100644
--- a/docs/misc/xen-command-line.pandoc
+++ b/docs/misc/xen-command-line.pandoc
@@ -1259,12 +1259,13 @@ does not provide `VM_ENTRY_LOAD_GUEST_PAT`.
 ### fred (x86)
 > `= <bool>`
 
-> Default: `false`
+> Default: `true` on AMD, `false` otherwise
 
 Flexible Return and Event Delivery is an overhaul of interrupt, exception and
-system call handling, fixing many corner cases in the x86 architecture, and
-expected in hardware from 2025.  Support in Xen is a work in progress and
-disabled by default.
+system call handling, fixing many corner cases in the x86 architecture, and is
+available on Intel Panther Lake and Diamond Rapids CPUs, and AMD Zen6 CPUs.
+FRED is fully supported on AMD hardware.  On Intel hardware it is still tech
+preview, and in particular not security supported.
 
 ### gnttab
 > `= List of [ max-ver:<integer>, transitive=<bool>, transfer=<bool> ]`
diff --git a/xen/arch/x86/traps-setup.c b/xen/arch/x86/traps-setup.c
index ccbd53fd9d..a79a3b2013 100644
--- a/xen/arch/x86/traps-setup.c
+++ b/xen/arch/x86/traps-setup.c
@@ -22,7 +22,7 @@ unsigned int __ro_after_init ler_msr;
 static bool __initdata opt_ler;
 boolean_param("ler", opt_ler);
 
-int8_t __ro_after_init opt_fred = 0;
+int8_t __ro_after_init opt_fred = -1;
 boolean_param("fred", opt_fred);
 
 void nocall entry_PF(void);
@@ -392,7 +392,7 @@ void __init traps_init(void)
     }
 
     if ( opt_fred == -1 )
-        opt_fred = !pv_shim;
+        opt_fred = (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) && !pv_shim;
 
     if ( opt_fred )
     {