Merge tag 'microcode_fixes_for_3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp into x86/microcode

Pull x86 microcode fixes from Borislav Petkov:

  "Reload microcode when resuming and the case when only the early loader
   has been utilized.

   Also, do not load the driver on paravirt guests, from Boris Ostrovsky."

Signed-off-by: Ingo Molnar <mingo@kernel.org>

4 files changed, 79 insertions, 18 deletions

diff --git a/arch/x86/kernel/cpu/microcode/amd_early.c b/arch/x86/kernel/cpu/microcode/amd_early.c
index 3d988a30a21d..737737edbd1e 100644
--- a/arch/x86/kernel/cpu/microcode/amd_early.c
+++ b/arch/x86/kernel/cpu/microcode/amd_early.c
@@ -402,3 +402,21 @@ int __init save_microcode_in_initrd_amd(void)
 
         return retval;
 }
+
+void reload_ucode_amd(void)
+{
+        struct microcode_amd *mc;
+        u32 rev, eax;
+
+        rdmsr(MSR_AMD64_PATCH_LEVEL, rev, eax);
+
+        mc = (struct microcode_amd *)amd_ucode_patch;
+
+        if (mc && rev < mc->hdr.patch_id) {
+                if (!__apply_microcode_amd(mc)) {
+                        ucode_new_rev = mc->hdr.patch_id;
+                        pr_info("microcode: reload patch_level=0x%08x\n",
+                                ucode_new_rev);
+                }
+        }
+}
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index 2ce9051174e6..15c29096136b 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -466,13 +466,7 @@ static void mc_bp_resume(void)
         if (uci->valid && uci->mc)
                 microcode_ops->apply_microcode(cpu);
         else if (!uci->mc)
-                /*
-                 * We might resume and not have applied late microcode but still
-                 * have a newer patch stashed from the early loader. We don't
-                 * have it in uci->mc so we have to load it the same way we're
-                 * applying patches early on the APs.
-                 */
-                load_ucode_ap();
+                reload_early_microcode();
 }
 
 static struct syscore_ops mc_syscore_ops = {
@@ -557,7 +551,7 @@ static int __init microcode_init(void)
         struct cpuinfo_x86 *c = &cpu_data(0);
         int error;
 
-        if (dis_ucode_ldr)
+        if (paravirt_enabled() || dis_ucode_ldr)
                 return 0;
 
         if (c->x86_vendor == X86_VENDOR_INTEL)
diff --git a/arch/x86/kernel/cpu/microcode/core_early.c b/arch/x86/kernel/cpu/microcode/core_early.c
index 2c017f242a78..d45df4bd16ab 100644
--- a/arch/x86/kernel/cpu/microcode/core_early.c
+++ b/arch/x86/kernel/cpu/microcode/core_early.c
@@ -176,3 +176,24 @@ int __init save_microcode_in_initrd(void)
 
         return 0;
 }
+
+void reload_early_microcode(void)
+{
+        int vendor, x86;
+
+        vendor = x86_vendor();
+        x86 = x86_family();
+
+        switch (vendor) {
+        case X86_VENDOR_INTEL:
+                if (x86 >= 6)
+                        reload_ucode_intel();
+                break;
+        case X86_VENDOR_AMD:
+                if (x86 >= 0x10)
+                        reload_ucode_amd();
+                break;
+        default:
+                break;
+        }
+}
diff --git a/arch/x86/kernel/cpu/microcode/intel_early.c b/arch/x86/kernel/cpu/microcode/intel_early.c
index b88343f7a3b3..f04d0d6638ca 100644
--- a/arch/x86/kernel/cpu/microcode/intel_early.c
+++ b/arch/x86/kernel/cpu/microcode/intel_early.c
@@ -34,6 +34,8 @@ 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,
@@ -650,8 +652,7 @@ static inline void print_ucode(struct ucode_cpu_info *uci)
 }
 #endif
 
-static int apply_microcode_early(struct mc_saved_data *mc_saved_data,
-                                 struct ucode_cpu_info *uci)
+static int apply_microcode_early(struct ucode_cpu_info *uci, bool early)
 {
         struct microcode_intel *mc_intel;
         unsigned int val[2];
@@ -680,7 +681,10 @@ static int apply_microcode_early(struct mc_saved_data *mc_saved_data,
 #endif
         uci->cpu_sig.rev = val[1];
 
-        print_ucode(uci);
+        if (early)
+                print_ucode(uci);
+        else
+                print_ucode_info(uci, mc_intel->hdr.date);
 
         return 0;
 }
@@ -713,14 +717,22 @@ _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 ucode_cpu_info *uci,
+                      struct microcode_intel *bsp)
 {
+        enum ucode_state ret;
+
         collect_cpu_info_early(uci);
         scan_microcode(initrd_start_early, initrd_end_early, mc_saved_data,
                        mc_saved_in_initrd, uci);
-        load_microcode(mc_saved_data, mc_saved_in_initrd,
-                       initrd_start_early, uci);
-        apply_microcode_early(mc_saved_data, uci);
+
+        ret = load_microcode(mc_saved_data, mc_saved_in_initrd,
+                             initrd_start_early, uci);
+
+        if (ret == UCODE_OK) {
+                apply_microcode_early(uci, true);
+                memcpy(bsp, uci->mc, sizeof(*bsp));
+        }
 }
 
 void __init
@@ -729,10 +741,12 @@ 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;
@@ -741,15 +755,17 @@ 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);
+                initrd_start_early, initrd_end_early, &uci, bsp_p);
 #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;
         initrd_end_early = initrd_start_early + ramdisk_size;
 
         _load_ucode_intel_bsp(&mc_saved_data, mc_saved_in_initrd,
-                              initrd_start_early, initrd_end_early, &uci);
+                              initrd_start_early, initrd_end_early,
+                              &uci, bsp_p);
 #endif
 }
 
@@ -783,5 +799,17 @@ void load_ucode_intel_ap(void)
         collect_cpu_info_early(&uci);
         load_microcode(mc_saved_data_p, mc_saved_in_initrd_p,
                        initrd_start_addr, &uci);
-        apply_microcode_early(mc_saved_data_p, &uci);
+        apply_microcode_early(&uci, true);
+}
+
+void reload_ucode_intel(void)
+{
+        struct ucode_cpu_info uci;
+
+        if (!bsp_patch.hdr.rev)
+                return;
+
+        uci.mc = &bsp_patch;
+
+        apply_microcode_early(&uci, false);
 }