diff --git a/arm-virt-acpi-Extend-cpufreq-to-support-max_cpus.patch b/arm-virt-acpi-Extend-cpufreq-to-support-max_cpus.patch
new file mode 100644
index 0000000..501573c
--- /dev/null
+++ b/arm-virt-acpi-Extend-cpufreq-to-support-max_cpus.patch
@@ -0,0 +1,66 @@
+From e3522e63a2f14c3c7d8cd603099b6bb51087f43b Mon Sep 17 00:00:00 2001
+From: Keqian Zhu <zhukeqian1@huawei.com>
+Date: Wed, 22 Apr 2020 19:52:58 +0800
+Subject: [PATCH] arm/virt/acpi: Extend cpufreq to support max_cpus
+
+We will support CPU hotplug soon, so extend memory region size to
+allow hotplugged CPU access cpufreq space.
+
+Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com>
+---
+ hw/acpi/cpufreq.c | 15 ++++++---------
+ 1 file changed, 6 insertions(+), 9 deletions(-)
+
+diff --git a/hw/acpi/cpufreq.c b/hw/acpi/cpufreq.c
+index a84db490b3..a76f7b8fa2 100644
+--- a/hw/acpi/cpufreq.c
++++ b/hw/acpi/cpufreq.c
+@@ -83,6 +83,7 @@ typedef struct CpuhzState {
+     uint32_t PerformanceLimited;
+     uint32_t LowestFreq;
+     uint32_t NominalFreq;
++    uint32_t num_cpu;
+     uint32_t reg_size;
+ } CpuhzState;
+ 
+@@ -93,10 +94,7 @@ static uint64_t cpufreq_read(void *opaque, hwaddr offset, unsigned size)
+     uint64_t r;
+     uint64_t n;
+ 
+-    MachineState *ms = MACHINE(qdev_get_machine());
+-    unsigned int smp_cpus = ms->smp.cpus;
+-
+-    if (offset >= smp_cpus * CPPC_REG_PER_CPU_STRIDE) {
++    if (offset >= s->num_cpu * CPPC_REG_PER_CPU_STRIDE) {
+         warn_report("cpufreq_read: offset 0x%lx out of range", offset);
+         return 0;
+     }
+@@ -163,11 +161,10 @@ static uint64_t cpufreq_read(void *opaque, hwaddr offset, unsigned size)
+ static void cpufreq_write(void *opaque, hwaddr offset,
+                            uint64_t value, unsigned size)
+ {
++    CpuhzState *s = CPUFREQ(opaque);
+     uint64_t n;
+-    MachineState *ms = MACHINE(qdev_get_machine());
+-    unsigned int smp_cpus = ms->smp.cpus;
+ 
+-    if (offset >= smp_cpus * CPPC_REG_PER_CPU_STRIDE) {
++    if (offset >= s->num_cpu * CPPC_REG_PER_CPU_STRIDE) {
+         error_printf("cpufreq_write: offset 0x%lx out of range", offset);
+         return;
+     }
+@@ -248,9 +245,9 @@ static void cpufreq_init(Object *obj)
+     CpuhzState *s = CPUFREQ(obj);
+ 
+     MachineState *ms = MACHINE(qdev_get_machine());
+-    unsigned int smp_cpus = ms->smp.cpus;
++    s->num_cpu = ms->smp.max_cpus;
+ 
+-    s->reg_size = smp_cpus * CPPC_REG_PER_CPU_STRIDE;
++    s->reg_size = s->num_cpu * CPPC_REG_PER_CPU_STRIDE;
+     if (s->reg_size > MAX_SUPPORT_SPACE) {
+         error_report("Required space 0x%x excesses the max support 0x%x",
+                  s->reg_size, MAX_SUPPORT_SPACE);
+-- 
+2.27.0
+