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Subject[PATCH 05/12] x86/microcode: Export the microcode cache linked list
Date
From: Borislav Petkov <bp@suse.de>

It will be used by both drivers so move it to core.c.

No functionality change.

Signed-off-by: Borislav Petkov <bp@suse.de>
---
arch/x86/include/asm/microcode.h | 9 +++++++++
arch/x86/kernel/cpu/microcode/amd.c | 23 +++++++----------------
arch/x86/kernel/cpu/microcode/core.c | 2 ++
3 files changed, 18 insertions(+), 16 deletions(-)

diff --git a/arch/x86/include/asm/microcode.h b/arch/x86/include/asm/microcode.h
index 05e56d0968d4..91595ecb3689 100644
--- a/arch/x86/include/asm/microcode.h
+++ b/arch/x86/include/asm/microcode.h
@@ -20,6 +20,15 @@ do { \
(u32)((u64)(val)), \
(u32)((u64)(val) >> 32))

+struct ucode_patch {
+ struct list_head plist;
+ void *data; /* Intel uses only this one */
+ u32 patch_id;
+ u16 equiv_cpu;
+};
+
+extern struct list_head microcode_cache;
+
struct cpu_signature {
unsigned int sig;
unsigned int pf;
diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 6b3929e80fd4..8cb20e3e9436 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -39,15 +39,6 @@

static struct equiv_cpu_entry *equiv_cpu_table;

-struct ucode_patch {
- struct list_head plist;
- void *data;
- u32 patch_id;
- u16 equiv_cpu;
-};
-
-static LIST_HEAD(pcache);
-
/*
* This points to the current valid container of microcode patches which we will
* save from the initrd before jettisoning its contents.
@@ -312,9 +303,9 @@ void __init load_ucode_amd_bsp(unsigned int family)
#ifdef CONFIG_X86_32
/*
* On 32-bit, since AP's early load occurs before paging is turned on, we
- * cannot traverse cpu_equiv_table and pcache in kernel heap memory. So during
- * cold boot, AP will apply_ucode_in_initrd() just like the BSP. During
- * save_microcode_in_initrd_amd() BSP's patch is copied to amd_ucode_patch,
+ * cannot traverse cpu_equiv_table and microcode_cache in kernel heap memory.
+ * So during cold boot, AP will apply_ucode_in_initrd() just like the BSP.
+ * In save_microcode_in_initrd_amd() BSP's patch is copied to amd_ucode_patch,
* which is used upon resume from suspend.
*/
void load_ucode_amd_ap(void)
@@ -508,7 +499,7 @@ static struct ucode_patch *cache_find_patch(u16 equiv_cpu)
{
struct ucode_patch *p;

- list_for_each_entry(p, &pcache, plist)
+ list_for_each_entry(p, &microcode_cache, plist)
if (p->equiv_cpu == equiv_cpu)
return p;
return NULL;
@@ -518,7 +509,7 @@ static void update_cache(struct ucode_patch *new_patch)
{
struct ucode_patch *p;

- list_for_each_entry(p, &pcache, plist) {
+ list_for_each_entry(p, &microcode_cache, plist) {
if (p->equiv_cpu == new_patch->equiv_cpu) {
if (p->patch_id >= new_patch->patch_id)
/* we already have the latest patch */
@@ -531,14 +522,14 @@ static void update_cache(struct ucode_patch *new_patch)
}
}
/* no patch found, add it */
- list_add_tail(&new_patch->plist, &pcache);
+ list_add_tail(&new_patch->plist, &microcode_cache);
}

static void free_cache(void)
{
struct ucode_patch *p, *tmp;

- list_for_each_entry_safe(p, tmp, &pcache, plist) {
+ list_for_each_entry_safe(p, tmp, &microcode_cache, plist) {
__list_del(p->plist.prev, p->plist.next);
kfree(p->data);
kfree(p);
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index d0d1a0f5a497..55a2b24b2bdd 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -45,6 +45,8 @@
static struct microcode_ops *microcode_ops;
static bool dis_ucode_ldr;

+LIST_HEAD(microcode_cache);
+
/*
* Synchronization.
*
--
2.10.0
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