x86, microcode, amd: Early microcode patch loading support for AMD
Add early microcode patch loading support for AMD.
Signed-off-by: Jacob Shin <jacob.shin@amd.com>
Link: http://lkml.kernel.org/r/1369940959-2077-5-git-send-email-jacob.shin@amd.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
diff --git a/arch/x86/kernel/microcode_amd.c b/arch/x86/kernel/microcode_amd.c
index 8f11f8f..47ebb1d 100644
--- a/arch/x86/kernel/microcode_amd.c
+++ b/arch/x86/kernel/microcode_amd.c
@@ -126,9 +126,20 @@
static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig)
{
struct cpuinfo_x86 *c = &cpu_data(cpu);
+ struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
+ struct ucode_patch *p;
csig->sig = cpuid_eax(0x00000001);
csig->rev = c->microcode;
+
+ /*
+ * a patch could have been loaded early, set uci->mc so that
+ * mc_bp_resume() can call apply_microcode()
+ */
+ p = find_patch(cpu);
+ if (p && (p->patch_id == csig->rev))
+ uci->mc = p->data;
+
pr_info("CPU%d: patch_level=0x%08x\n", cpu, csig->rev);
return 0;
@@ -373,6 +384,17 @@
if (ret != UCODE_OK)
cleanup();
+#if defined(CONFIG_MICROCODE_AMD_EARLY) && defined(CONFIG_X86_32)
+ /* save BSP's matching patch for early load */
+ if (cpu_data(cpu).cpu_index == boot_cpu_data.cpu_index) {
+ struct ucode_patch *p = find_patch(cpu);
+ if (p) {
+ memset(amd_bsp_mpb, 0, MPB_MAX_SIZE);
+ memcpy(amd_bsp_mpb, p->data, min_t(u32, ksize(p->data),
+ MPB_MAX_SIZE));
+ }
+ }
+#endif
return ret;
}