x86/ucode/AMD: late load the patch on every logical thread

Currently late ucode loading is performed only on the first core of CPU
siblings.  But according to the latest recommendation from AMD, late
ucode loading should happen on every logical thread/core on AMD CPUs.

To achieve that, introduce is_cpu_primary() helper which will consider
every logical cpu as "primary" when running on AMD CPUs.  Also include
Hygon in the check for future-proofing.

Signed-off-by: Sergey Dyasli <sergey.dyasli@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
master commit: f1315e48a03a42f78f9b03c0a384165baf02acae
master date: 2023-02-28 14:51:28 +0100

diff --git a/xen/arch/x86/cpu/microcode/core.c b/xen/arch/x86/cpu/microcode/core.c
index 57ecc5358bdfa5b627aa760df8d1bddb171ea8da..2497630bbe2072d5dbbd829b41285253b769ad40 100644 (file)
--- a/xen/arch/x86/cpu/microcode/core.c
+++ b/xen/arch/x86/cpu/microcode/core.c
@@ -274,6 +274,20 @@ static bool microcode_update_cache(struct microcode_patch *patch)
     return true;
 }
 
+/* Returns true if ucode should be loaded on a given cpu */
+static bool is_cpu_primary(unsigned int cpu)
+{
+    if ( boot_cpu_data.x86_vendor & (X86_VENDOR_AMD | X86_VENDOR_HYGON) )
+        /* Load ucode on every logical thread/core */
+        return true;
+
+    /* Intel CPUs should load ucode only on the first core of SMT siblings */
+    if ( cpu == cpumask_first(per_cpu(cpu_sibling_mask, cpu)) )
+        return true;
+
+    return false;
+}
+
 /* Wait for a condition to be met with a timeout (us). */
 static int wait_for_condition(bool (*func)(unsigned int data),
                               unsigned int data, unsigned int timeout)
@@ -380,7 +394,7 @@ static int primary_thread_work(const struct microcode_patch *patch)
 static int cf_check microcode_nmi_callback(
     const struct cpu_user_regs *regs, int cpu)
 {
-    unsigned int primary = cpumask_first(this_cpu(cpu_sibling_mask));
+    bool primary_cpu = is_cpu_primary(cpu);
     int ret;
 
     /* System-generated NMI, leave to main handler */
@@ -393,10 +407,10 @@ static int cf_check microcode_nmi_callback(
      * ucode_in_nmi.
      */
     if ( cpu == cpumask_first(&cpu_online_map) ||
-         (!ucode_in_nmi && cpu == primary) )
+         (!ucode_in_nmi && primary_cpu) )
         return 0;
 
-    if ( cpu == primary )
+    if ( primary_cpu )
         ret = primary_thread_work(nmi_patch);
     else
         ret = secondary_nmi_work();
@@ -547,7 +561,7 @@ static int cf_check do_microcode_update(void *patch)
      */
     if ( cpu == cpumask_first(&cpu_online_map) )
         ret = control_thread_fn(patch);
-    else if ( cpu == cpumask_first(this_cpu(cpu_sibling_mask)) )
+    else if ( is_cpu_primary(cpu) )
         ret = primary_thread_fn(patch);
     else
         ret = secondary_thread_fn();
@@ -640,7 +654,7 @@ static long cf_check microcode_update_helper(void *data)
     /* Calculate the number of online CPU core */
     nr_cores = 0;
     for_each_online_cpu(cpu)
-        if ( cpu == cpumask_first(per_cpu(cpu_sibling_mask, cpu)) )
+        if ( is_cpu_primary(cpu) )
             nr_cores++;
 
     printk(XENLOG_INFO "%u cores are to update their microcode\n", nr_cores);