[PATCH V4 1/2] x86/microcode: Cleanup int type usage for cpu numbers

[Aravind Gopalakrishnan <aravind.gopalakrishnan@amd.com>]

CPU numbers can't be negative. Fixing the microcode*
files to properly use unsigned type in this patch.

No functional change is introduced.

Signed-off-by: Aravind Gopalakrishnan <aravind.gopalakrishnan@amd.com>
---
 xen/arch/x86/microcode.c        |  6 +++---
 xen/arch/x86/microcode_amd.c    | 12 +++++++-----
 xen/arch/x86/microcode_intel.c  | 15 ++++++++-------
 xen/include/asm-x86/microcode.h |  9 +++++----
 xen/include/asm-x86/processor.h |  2 +-
 5 files changed, 24 insertions(+), 20 deletions(-)

diff --git a/xen/arch/x86/microcode.c b/xen/arch/x86/microcode.c
index 091d5d1..c20bde6 100644
--- a/xen/arch/x86/microcode.c
+++ b/xen/arch/x86/microcode.c
@@ -195,7 +195,7 @@ struct microcode_info {
     char buffer[1];
 };
 
-static void __microcode_fini_cpu(int cpu)
+static void __microcode_fini_cpu(unsigned int cpu)
 {
     struct ucode_cpu_info *uci = &per_cpu(ucode_cpu_info, cpu);
 
@@ -203,14 +203,14 @@ static void __microcode_fini_cpu(int cpu)
     memset(uci, 0, sizeof(*uci));
 }
 
-static void microcode_fini_cpu(int cpu)
+static void microcode_fini_cpu(unsigned int cpu)
 {
     spin_lock(&microcode_mutex);
     __microcode_fini_cpu(cpu);
     spin_unlock(&microcode_mutex);
 }
 
-int microcode_resume_cpu(int cpu)
+int microcode_resume_cpu(unsigned int cpu)
 {
     int err;
     struct ucode_cpu_info *uci = &per_cpu(ucode_cpu_info, cpu);
diff --git a/xen/arch/x86/microcode_amd.c b/xen/arch/x86/microcode_amd.c
index f79b397..2717479 100644
--- a/xen/arch/x86/microcode_amd.c
+++ b/xen/arch/x86/microcode_amd.c
@@ -79,7 +79,7 @@ struct mpbhdr {
 static DEFINE_SPINLOCK(microcode_update_lock);
 
 /* See comment in start_update() for cases when this routine fails */
-static int collect_cpu_info(int cpu, struct cpu_signature *csig)
+static int collect_cpu_info(unsigned int cpu, struct cpu_signature *csig)
 {
     struct cpuinfo_x86 *c = &cpu_data[cpu];
 
@@ -149,7 +149,8 @@ static bool_t find_equiv_cpu_id(const struct equiv_cpu_entry *equiv_cpu_table,
     return 0;
 }
 
-static bool_t microcode_fits(const struct microcode_amd *mc_amd, int cpu)
+static bool_t microcode_fits(const struct microcode_amd *mc_amd,
+                             unsigned int cpu)
 {
     struct ucode_cpu_info *uci = &per_cpu(ucode_cpu_info, cpu);
     const struct microcode_header_amd *mc_header = mc_amd->mpb;
@@ -186,7 +187,7 @@ static bool_t microcode_fits(const struct microcode_amd *mc_amd, int cpu)
     return 1;
 }
 
-static int apply_microcode(int cpu)
+static int apply_microcode(unsigned int cpu)
 {
     unsigned long flags;
     struct ucode_cpu_info *uci = &per_cpu(ucode_cpu_info, cpu);
@@ -347,7 +348,8 @@ static int container_fast_forward(const void *data, size_t size_left, size_t *of
     return 0;
 }
 
-static int cpu_request_microcode(int cpu, const void *buf, size_t bufsize)
+static int cpu_request_microcode(unsigned int cpu, const void *buf,
+                                 size_t bufsize)
 {
     struct microcode_amd *mc_amd, *mc_old;
     size_t offset = 0;
@@ -511,7 +513,7 @@ static int cpu_request_microcode(int cpu, const void *buf, size_t bufsize)
     return error;
 }
 
-static int microcode_resume_match(int cpu, const void *mc)
+static int microcode_resume_match(unsigned int cpu, const void *mc)
 {
     struct ucode_cpu_info *uci = &per_cpu(ucode_cpu_info, cpu);
     struct microcode_amd *mc_amd = uci->mc.mc_amd;
diff --git a/xen/arch/x86/microcode_intel.c b/xen/arch/x86/microcode_intel.c
index b54cd71..0a5f403 100644
--- a/xen/arch/x86/microcode_intel.c
+++ b/xen/arch/x86/microcode_intel.c
@@ -90,7 +90,7 @@ struct extended_sigtable {
 /* serialize access to the physical write to MSR 0x79 */
 static DEFINE_SPINLOCK(microcode_update_lock);
 
-static int collect_cpu_info(int cpu_num, struct cpu_signature *csig)
+static int collect_cpu_info(unsigned int cpu_num, struct cpu_signature *csig)
 {
     struct cpuinfo_x86 *c = &cpu_data[cpu_num];
     uint64_t msr_content;
@@ -129,7 +129,7 @@ static int collect_cpu_info(int cpu_num, struct cpu_signature *csig)
 }
 
 static inline int microcode_update_match(
-    int cpu_num, const struct microcode_header_intel *mc_header,
+    unsigned int cpu_num, const struct microcode_header_intel *mc_header,
     int sig, int pf)
 {
     struct ucode_cpu_info *uci = &per_cpu(ucode_cpu_info, cpu_num);
@@ -232,7 +232,7 @@ static int microcode_sanity_check(void *mc)
  * return 1 - found update
  * return < 0 - error
  */
-static int get_matching_microcode(const void *mc, int cpu)
+static int get_matching_microcode(const void *mc, unsigned int cpu)
 {
     struct ucode_cpu_info *uci = &per_cpu(ucode_cpu_info, cpu);
     const struct microcode_header_intel *mc_header = mc;
@@ -277,12 +277,12 @@ static int get_matching_microcode(const void *mc, int cpu)
     return 1;
 }
 
-static int apply_microcode(int cpu)
+static int apply_microcode(unsigned int cpu)
 {
     unsigned long flags;
     uint64_t msr_content;
     unsigned int val[2];
-    int cpu_num = raw_smp_processor_id();
+    unsigned int cpu_num = raw_smp_processor_id();
     struct ucode_cpu_info *uci = &per_cpu(ucode_cpu_info, cpu_num);
 
     /* We should bind the task to the CPU */
@@ -351,7 +351,8 @@ static long get_next_ucode_from_buffer(void **mc, const u8 *buf,
     return offset + total_size;
 }
 
-static int cpu_request_microcode(int cpu, const void *buf, size_t size)
+static int cpu_request_microcode(unsigned int cpu, const void *buf,
+                                 size_t size)
 {
     long offset = 0;
     int error = 0;
@@ -391,7 +392,7 @@ static int cpu_request_microcode(int cpu, const void *buf, size_t size)
     return error;
 }
 
-static int microcode_resume_match(int cpu, const void *mc)
+static int microcode_resume_match(unsigned int cpu, const void *mc)
 {
     return get_matching_microcode(mc, cpu);
 }
diff --git a/xen/include/asm-x86/microcode.h b/xen/include/asm-x86/microcode.h
index 00a672a..23ea954 100644
--- a/xen/include/asm-x86/microcode.h
+++ b/xen/include/asm-x86/microcode.h
@@ -7,10 +7,11 @@ struct cpu_signature;
 struct ucode_cpu_info;
 
 struct microcode_ops {
-    int (*microcode_resume_match)(int cpu, const void *mc);
-    int (*cpu_request_microcode)(int cpu, const void *buf, size_t size);
-    int (*collect_cpu_info)(int cpu, struct cpu_signature *csig);
-    int (*apply_microcode)(int cpu);
+    int (*microcode_resume_match)(unsigned int cpu, const void *mc);
+    int (*cpu_request_microcode)(unsigned int cpu, const void *buf,
+                                 size_t size);
+    int (*collect_cpu_info)(unsigned int cpu, struct cpu_signature *csig);
+    int (*apply_microcode)(unsigned int cpu);
     int (*start_update)(void);
 };
 
diff --git a/xen/include/asm-x86/processor.h b/xen/include/asm-x86/processor.h
index b9a00aa..f507f5e 100644
--- a/xen/include/asm-x86/processor.h
+++ b/xen/include/asm-x86/processor.h
@@ -570,7 +570,7 @@ int wrmsr_hypervisor_regs(uint32_t idx, uint64_t val);
 
 void microcode_set_module(unsigned int);
 int microcode_update(XEN_GUEST_HANDLE_PARAM(const_void), unsigned long len);
-int microcode_resume_cpu(int cpu);
+int microcode_resume_cpu(unsigned int cpu);
 
 enum get_cpu_vendor {
    gcv_host_early,
-- 
1.9.1