3 files changed, 15 insertions, 6 deletions
diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 46673530bc6f..caa0f595abcf 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -322,7 +322,7 @@ static u32 get_patch_level(void)
 {
 	u32 rev, dummy __always_unused;
 
-	if (IS_ENABLED(CONFIG_MICROCODE_DBG)) {
+	if (IS_ENABLED(CONFIG_MICROCODE_DBG) && hypervisor_present) {
 		int cpu = smp_processor_id();
 
 		if (!microcode_rev[cpu]) {
@@ -714,7 +714,7 @@ static bool __apply_microcode_amd(struct microcode_amd *mc, u32 *cur_rev,
 			invlpg(p_addr_end);
 	}
 
-	if (IS_ENABLED(CONFIG_MICROCODE_DBG))
+	if (IS_ENABLED(CONFIG_MICROCODE_DBG) && hypervisor_present)
 		microcode_rev[smp_processor_id()] = mc->hdr.patch_id;
 
 	/* verify patch application was successful */
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index 68049f171860..651202e6fefb 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -57,6 +57,8 @@ bool force_minrev = IS_ENABLED(CONFIG_MICROCODE_LATE_FORCE_MINREV);
 u32 base_rev;
 u32 microcode_rev[NR_CPUS] = {};
 
+bool hypervisor_present;
+
 /*
  * Synchronization.
  *
@@ -117,7 +119,13 @@ bool __init microcode_loader_disabled(void)
 	 * Disable when:
 	 *
 	 * 1) The CPU does not support CPUID.
-	 *
+	 */
+	if (!cpuid_feature()) {
+		dis_ucode_ldr = true;
+		return dis_ucode_ldr;
+	}
+
+	/*
 	 * 2) Bit 31 in CPUID[1]:ECX is clear
 	 *    The bit is reserved for hypervisor use. This is still not
 	 *    completely accurate as XEN PV guests don't see that CPUID bit
@@ -127,9 +135,9 @@ bool __init microcode_loader_disabled(void)
 	 * 3) Certain AMD patch levels are not allowed to be
 	 *    overwritten.
 	 */
-	if (!cpuid_feature() ||
-	    ((native_cpuid_ecx(1) & BIT(31)) &&
-	      !IS_ENABLED(CONFIG_MICROCODE_DBG)) ||
+	hypervisor_present = native_cpuid_ecx(1) & BIT(31);
+
+	if ((hypervisor_present && !IS_ENABLED(CONFIG_MICROCODE_DBG)) ||
 	    amd_check_current_patch_level())
 		dis_ucode_ldr = true;
 
diff --git a/arch/x86/kernel/cpu/microcode/internal.h b/arch/x86/kernel/cpu/microcode/internal.h
index a10b547eda1e..3b93c0676b4f 100644
--- a/arch/x86/kernel/cpu/microcode/internal.h
+++ b/arch/x86/kernel/cpu/microcode/internal.h
@@ -48,6 +48,7 @@ extern struct early_load_data early_data;
 extern struct ucode_cpu_info ucode_cpu_info[];
 extern u32 microcode_rev[NR_CPUS];
 extern u32 base_rev;
+extern bool hypervisor_present;
 
 struct cpio_data find_microcode_in_initrd(const char *path);