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>

1 files changed, 18 insertions, 0 deletions

diff --git a/arch/x86/kernel/cpu/microcode/amd_early.c b/arch/x86/kernel/cpu/microcode/amd_early.c
index 3d988a30a21..737737edbd1 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);
+		}
+	}
+}