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Subject[PATCH 13/17] x86/microcode/intel: Rename mc_saved_in_initrd
Date
From: Borislav Petkov <bp@suse.de>

Rename it to mc_tmp_ptrs to denote better what it is - a temporary array
for saving pointers to microcode blobs. And "initrd" is not accurate
anymore since initrd is not the only source for early microcode.
Therefore, rename copy_initrd_ptrs() to copy_ptrs() simply and
"initrd_start" to "offset".

And then do the following convention: the global variable is called
"mc_tmp_ptrs" and the local function arguments "mc_ptrs" for
differentiation.

Signed-off-by: Borislav Petkov <bp@suse.de>
---
arch/x86/kernel/cpu/microcode/intel.c | 52 +++++++++++++++++++----------------
1 file changed, 28 insertions(+), 24 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index ff0b44951d12..5970758bbcdd 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -39,7 +39,13 @@
#include <asm/setup.h>
#include <asm/msr.h>

-static unsigned long mc_saved_in_initrd[MAX_UCODE_COUNT];
+/*
+ * Temporary microcode blobs pointers storage. We note here the pointers to
+ * microcode blobs we've got from whatever storage (detached initrd, builtin).
+ * Later on, we put those into final storage mc_saved_data.mc_saved.
+ */
+static unsigned long mc_tmp_ptrs[MAX_UCODE_COUNT];
+
static struct mc_saved_data {
unsigned int num_saved;
struct microcode_intel **mc_saved;
@@ -78,13 +84,13 @@ load_microcode_early(struct microcode_intel **saved,
}

static inline void
-copy_initrd_ptrs(struct microcode_intel **mc_saved, unsigned long *initrd,
- unsigned long off, int num_saved)
+copy_ptrs(struct microcode_intel **mc_saved, unsigned long *mc_ptrs,
+ unsigned long off, int num_saved)
{
int i;

for (i = 0; i < num_saved; i++)
- mc_saved[i] = (struct microcode_intel *)(initrd[i] + off);
+ mc_saved[i] = (struct microcode_intel *)(mc_ptrs[i] + off);
}

#ifdef CONFIG_X86_32
@@ -106,14 +112,14 @@ microcode_phys(struct microcode_intel **mc_saved_tmp, struct mc_saved_data *mcs)
#endif

static enum ucode_state
-load_microcode(struct mc_saved_data *mcs, unsigned long *initrd,
- unsigned long initrd_start, struct ucode_cpu_info *uci)
+load_microcode(struct mc_saved_data *mcs, unsigned long *mc_ptrs,
+ unsigned long offset, struct ucode_cpu_info *uci)
{
struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
unsigned int count = mcs->num_saved;

if (!mcs->mc_saved) {
- copy_initrd_ptrs(mc_saved_tmp, initrd, initrd_start, count);
+ copy_ptrs(mc_saved_tmp, mc_ptrs, offset, count);

return load_microcode_early(mc_saved_tmp, count, uci);
} else {
@@ -284,7 +290,7 @@ static enum ucode_state __init
get_matching_model_microcode(int cpu, unsigned long start,
void *data, size_t size,
struct mc_saved_data *mcs,
- unsigned long *mc_saved_in_initrd,
+ unsigned long *mc_ptrs,
struct ucode_cpu_info *uci)
{
u8 *ucode_ptr = data;
@@ -337,7 +343,7 @@ get_matching_model_microcode(int cpu, unsigned long start,
}

for (i = 0; i < num_saved; i++)
- mc_saved_in_initrd[i] = (unsigned long)mc_saved_tmp[i] - start;
+ mc_ptrs[i] = (unsigned long)mc_saved_tmp[i] - start;

mcs->num_saved = num_saved;
out:
@@ -533,7 +539,7 @@ static bool __init load_builtin_intel_microcode(struct cpio_data *cp)

static __initdata char ucode_name[] = "kernel/x86/microcode/GenuineIntel.bin";
static __init enum ucode_state
-scan_microcode(struct mc_saved_data *mcs, unsigned long *initrd,
+scan_microcode(struct mc_saved_data *mcs, unsigned long *mc_ptrs,
unsigned long start, unsigned long size,
struct ucode_cpu_info *uci)
{
@@ -559,7 +565,7 @@ scan_microcode(struct mc_saved_data *mcs, unsigned long *initrd,
}

return get_matching_model_microcode(0, start, cd.data, cd.size,
- mcs, initrd, uci);
+ mcs, mc_ptrs, uci);
}

/*
@@ -675,7 +681,7 @@ static int apply_microcode_early(struct ucode_cpu_info *uci, bool early)

/*
* This function converts microcode patch offsets previously stored in
- * mc_saved_in_initrd to pointers and stores the pointers in mc_saved_data.
+ * mc_tmp_ptrs to pointers and stores the pointers in mc_saved_data.
*/
int __init save_microcode_in_initrd_intel(void)
{
@@ -686,7 +692,7 @@ int __init save_microcode_in_initrd_intel(void)
if (!count)
return ret;

- copy_initrd_ptrs(mc_saved, mc_saved_in_initrd, get_initrd_start(), count);
+ copy_ptrs(mc_saved, mc_tmp_ptrs, get_initrd_start(), count);

ret = save_microcode(&mc_saved_data, mc_saved, count);
if (ret)
@@ -698,7 +704,7 @@ int __init save_microcode_in_initrd_intel(void)
}

static void __init
-_load_ucode_intel_bsp(struct mc_saved_data *mcs, unsigned long *initrd,
+_load_ucode_intel_bsp(struct mc_saved_data *mcs, unsigned long *mc_ptrs,
unsigned long start, unsigned long size)
{
struct ucode_cpu_info uci;
@@ -706,11 +712,11 @@ _load_ucode_intel_bsp(struct mc_saved_data *mcs, unsigned long *initrd,

collect_cpu_info_early(&uci);

- ret = scan_microcode(mcs, initrd, start, size, &uci);
+ ret = scan_microcode(mcs, mc_ptrs, start, size, &uci);
if (ret != UCODE_OK)
return;

- ret = load_microcode(mcs, initrd, start, &uci);
+ ret = load_microcode(mcs, mc_ptrs, start, &uci);
if (ret != UCODE_OK)
return;

@@ -733,28 +739,28 @@ void __init load_ucode_intel_bsp(void)
start = (size ? p->hdr.ramdisk_image : 0);

_load_ucode_intel_bsp((struct mc_saved_data *)__pa_nodebug(&mc_saved_data),
- (unsigned long *)__pa_nodebug(&mc_saved_in_initrd),
+ (unsigned long *)__pa_nodebug(&mc_tmp_ptrs),
start, size);
#else
size = boot_params.hdr.ramdisk_size;
start = (size ? boot_params.hdr.ramdisk_image + PAGE_OFFSET : 0);

- _load_ucode_intel_bsp(&mc_saved_data, mc_saved_in_initrd, start, size);
+ _load_ucode_intel_bsp(&mc_saved_data, mc_tmp_ptrs, start, size);
#endif
}

void load_ucode_intel_ap(void)
{
- unsigned long *mc_saved_in_initrd_p;
+ unsigned long *mcs_tmp_p;
struct mc_saved_data *mcs_p;
struct ucode_cpu_info uci;
enum ucode_state ret;
#ifdef CONFIG_X86_32

- mc_saved_in_initrd_p = (unsigned long *)__pa_nodebug(mc_saved_in_initrd);
+ mcs_tmp_p = (unsigned long *)__pa_nodebug(mc_tmp_ptrs);
mcs_p = (struct mc_saved_data *)__pa_nodebug(&mc_saved_data);
#else
- mc_saved_in_initrd_p = mc_saved_in_initrd;
+ mcs_tmp_p = mc_tmp_ptrs;
mcs_p = &mc_saved_data;
#endif

@@ -766,9 +772,7 @@ void load_ucode_intel_ap(void)
return;

collect_cpu_info_early(&uci);
- ret = load_microcode(mcs_p, mc_saved_in_initrd_p,
- get_initrd_start_addr(), &uci);
-
+ ret = load_microcode(mcs_p, mcs_tmp_p, get_initrd_start_addr(), &uci);
if (ret != UCODE_OK)
return;

--
2.3.5
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