[Xen-devel] [PATCH v8 13/16] microcode: unify loading update during CPU resuming and AP wakeup

[Chao Gao <chao.gao@xxxxxxxxx>]

Both are loading the cached patch. Since APs call the unified function,
microcode_update_one(), during wakeup, the 'start_update' parameter
which originally used to distinguish BSP and APs is redundant. So remove
this parameter.

Signed-off-by: Chao Gao <chao.gao@xxxxxxxxx>
---
Changes in v8:
 - split out from the previous patch
---
 xen/arch/x86/acpi/power.c       |  2 +-
 xen/arch/x86/microcode.c        | 36 +++++++++++-------------------------
 xen/arch/x86/smpboot.c          |  5 +----
 xen/include/asm-x86/processor.h |  4 ++--
 4 files changed, 15 insertions(+), 32 deletions(-)

diff --git a/xen/arch/x86/acpi/power.c b/xen/arch/x86/acpi/power.c
index 4f21903..24798d5 100644
--- a/xen/arch/x86/acpi/power.c
+++ b/xen/arch/x86/acpi/power.c
@@ -253,7 +253,7 @@ static int enter_state(u32 state)
 
     console_end_sync();
 
-    microcode_resume_cpu();
+    microcode_update_one();
 
     if ( !recheck_cpu_features(0) )
         panic("Missing previously available feature(s)\n");
diff --git a/xen/arch/x86/microcode.c b/xen/arch/x86/microcode.c
index f0b1e39..cbaf13d 100644
--- a/xen/arch/x86/microcode.c
+++ b/xen/arch/x86/microcode.c
@@ -204,24 +204,6 @@ static struct microcode_patch *microcode_parse_blob(const 
char *buf,
     return NULL;
 }
 
-int microcode_resume_cpu(void)
-{
-    int err;
-    struct cpu_signature *sig = &this_cpu(cpu_sig);
-
-    if ( !microcode_ops )
-        return 0;
-
-    spin_lock(&microcode_mutex);
-
-    err = microcode_ops->collect_cpu_info(sig);
-    if ( likely(!err) )
-        err = microcode_ops->apply_microcode(microcode_cache);
-    spin_unlock(&microcode_mutex);
-
-    return err;
-}
-
 void microcode_free_patch(struct microcode_patch *microcode_patch)
 {
     microcode_ops->free_patch(microcode_patch->mc);
@@ -402,7 +384,16 @@ static int __init microcode_init(void)
 }
 __initcall(microcode_init);
 
-int __init early_microcode_update_cpu(bool start_update)
+/* Load a cached update to current cpu */
+int microcode_update_one(void)
+{
+    return microcode_ops ? microcode_update_cpu(NULL) : 0;
+}
+
+/*
+ * BSP calls this function to parse ucode blob and then apply an update.
+ */
+int __init early_microcode_update_cpu(void)
 {
     int rc = 0;
     void *data = NULL;
@@ -422,11 +413,6 @@ int __init early_microcode_update_cpu(bool start_update)
         data = bootstrap_map(&ucode_mod);
     }
 
-    microcode_ops->collect_cpu_info(&this_cpu(cpu_sig));
-
-    if ( !start_update )
-        return microcode_update_cpu(NULL);
-
     if ( data )
     {
         struct microcode_patch *patch;
@@ -480,7 +466,7 @@ int __init early_microcode_init(void)
         microcode_ops->collect_cpu_info(&this_cpu(cpu_sig));
 
         if ( ucode_mod.mod_end || ucode_blob.size )
-            rc = early_microcode_update_cpu(true);
+            rc = early_microcode_update_cpu();
     }
 
     return rc;
diff --git a/xen/arch/x86/smpboot.c b/xen/arch/x86/smpboot.c
index c818cfc..e62a1ca 100644
--- a/xen/arch/x86/smpboot.c
+++ b/xen/arch/x86/smpboot.c
@@ -361,10 +361,7 @@ void start_secondary(void *unused)
 
     initialize_cpu_data(cpu);
 
-    if ( system_state <= SYS_STATE_smp_boot )
-        early_microcode_update_cpu(false);
-    else
-        microcode_resume_cpu();
+    microcode_update_one();
 
     /*
      * If MSR_SPEC_CTRL is available, apply Xen's default setting and discard
diff --git a/xen/include/asm-x86/processor.h b/xen/include/asm-x86/processor.h
index 104faa9..2a76d90 100644
--- a/xen/include/asm-x86/processor.h
+++ b/xen/include/asm-x86/processor.h
@@ -568,9 +568,9 @@ int guest_wrmsr_xen(struct vcpu *v, uint32_t idx, uint64_t 
val);
 
 void microcode_set_module(unsigned int);
 int microcode_update(XEN_GUEST_HANDLE_PARAM(const_void), unsigned long len);
-int microcode_resume_cpu(void);
-int early_microcode_update_cpu(bool start_update);
+int early_microcode_update_cpu(void);
 int early_microcode_init(void);
+int microcode_update_one(void);
 int microcode_init_intel(void);
 int microcode_init_amd(void);
 
-- 
1.8.3.1


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