x86/microcode/intel: Fish out the stashed microcode for the BSP

I'm such a moron! The simple solution of saving the BSP patch
for use on resume was too simple (and wrong!), hint:
sizeof(struct microcode_intel).

What needs to be done instead is to fish out the microcode patch
we have stashed previously and apply that on the BSP in case the
late loader hasn't been utilized.

So do that instead.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/20141208110820.GB20057@pd.tnic
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 12 insertions, 14 deletions

diff --git a/arch/x86/kernel/cpu/microcode/intel_early.c b/arch/x86/kernel/cpu/microcode/intel_early.c
index f04d0d6638ca..ec9df6f9cd47 100644
--- a/arch/x86/kernel/cpu/microcode/intel_early.c
+++ b/arch/x86/kernel/cpu/microcode/intel_early.c
@@ -34,8 +34,6 @@ static struct mc_saved_data {
         struct microcode_intel **mc_saved;
 } mc_saved_data;
 
-static struct microcode_intel bsp_patch;
-
 static enum ucode_state
 generic_load_microcode_early(struct microcode_intel **mc_saved_p,
                              unsigned int mc_saved_count,
@@ -717,8 +715,7 @@ _load_ucode_intel_bsp(struct mc_saved_data *mc_saved_data,
                       unsigned long *mc_saved_in_initrd,
                       unsigned long initrd_start_early,
                       unsigned long initrd_end_early,
-                      struct ucode_cpu_info *uci,
-                      struct microcode_intel *bsp)
+                      struct ucode_cpu_info *uci)
 {
         enum ucode_state ret;
 
@@ -729,10 +726,8 @@ _load_ucode_intel_bsp(struct mc_saved_data *mc_saved_data,
         ret = load_microcode(mc_saved_data, mc_saved_in_initrd,
                              initrd_start_early, uci);
 
-        if (ret == UCODE_OK) {
+        if (ret == UCODE_OK)
                 apply_microcode_early(uci, true);
-                memcpy(bsp, uci->mc, sizeof(*bsp));
-        }
 }
 
 void __init
@@ -741,12 +736,10 @@ load_ucode_intel_bsp(void)
         u64 ramdisk_image, ramdisk_size;
         unsigned long initrd_start_early, initrd_end_early;
         struct ucode_cpu_info uci;
-        struct microcode_intel *bsp_p;
 #ifdef CONFIG_X86_32
         struct boot_params *boot_params_p;
 
         boot_params_p = (struct boot_params *)__pa_nodebug(&boot_params);
-        bsp_p         = (struct microcode_intel *)__pa_nodebug(&bsp_patch);
         ramdisk_image = boot_params_p->hdr.ramdisk_image;
         ramdisk_size  = boot_params_p->hdr.ramdisk_size;
         initrd_start_early = ramdisk_image;
@@ -755,9 +748,8 @@ load_ucode_intel_bsp(void)
         _load_ucode_intel_bsp(
                 (struct mc_saved_data *)__pa_nodebug(&mc_saved_data),
                 (unsigned long *)__pa_nodebug(&mc_saved_in_initrd),
-                initrd_start_early, initrd_end_early, &uci, bsp_p);
+                initrd_start_early, initrd_end_early, &uci);
 #else
-        bsp_p         = &bsp_patch;
         ramdisk_image = boot_params.hdr.ramdisk_image;
         ramdisk_size  = boot_params.hdr.ramdisk_size;
         initrd_start_early = ramdisk_image + PAGE_OFFSET;
@@ -765,7 +757,7 @@ load_ucode_intel_bsp(void)
 
         _load_ucode_intel_bsp(&mc_saved_data, mc_saved_in_initrd,
                               initrd_start_early, initrd_end_early,
-                              &uci, bsp_p);
+                              &uci);
 #endif
 }
 
@@ -805,11 +797,17 @@ void load_ucode_intel_ap(void)
 void reload_ucode_intel(void)
 {
         struct ucode_cpu_info uci;
+        enum ucode_state ret;
 
-        if (!bsp_patch.hdr.rev)
+        if (!mc_saved_data.mc_saved_count)
                 return;
 
-        uci.mc = &bsp_patch;
+        collect_cpu_info_early(&uci);
+
+        ret = generic_load_microcode_early(mc_saved_data.mc_saved,
+                                           mc_saved_data.mc_saved_count, &uci);
+        if (ret != UCODE_OK)
+                return;
 
         apply_microcode_early(&uci, false);
 }