lkml.org 
[lkml]   [2018]   [Apr]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 4.14 093/138] x86/microcode: Request microcode on the BSP
Date
4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Borislav Petkov <bp@suse.de>

commit cfb52a5a09c8ae3a1dafb44ce549fde5b69e8117 upstream.

... so that any newer version can land in the cache and can later be
fished out by the application functions. Do that before grabbing the
hotplug lock.

Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Tom Lendacky <thomas.lendacky@amd.com>
Tested-by: Ashok Raj <ashok.raj@intel.com>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Arjan Van De Ven <arjan.van.de.ven@intel.com>
Link: https://lkml.kernel.org/r/20180228102846.13447-7-bp@alien8.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
arch/x86/kernel/cpu/microcode/core.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)

--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -499,15 +499,10 @@ static int check_online_cpus(void)
static enum ucode_state reload_for_cpu(int cpu)
{
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
- enum ucode_state ustate;

if (!uci->valid)
return UCODE_OK;

- ustate = microcode_ops->request_microcode_fw(cpu, &microcode_pdev->dev, true);
- if (ustate != UCODE_OK)
- return ustate;
-
return apply_microcode_on_target(cpu);
}

@@ -515,11 +510,11 @@ static ssize_t reload_store(struct devic
struct device_attribute *attr,
const char *buf, size_t size)
{
+ int cpu, bsp = boot_cpu_data.cpu_index;
enum ucode_state tmp_ret = UCODE_OK;
bool do_callback = false;
unsigned long val;
ssize_t ret = 0;
- int cpu;

ret = kstrtoul(buf, 0, &val);
if (ret)
@@ -528,6 +523,10 @@ static ssize_t reload_store(struct devic
if (val != 1)
return size;

+ tmp_ret = microcode_ops->request_microcode_fw(bsp, &microcode_pdev->dev, true);
+ if (tmp_ret != UCODE_OK)
+ return size;
+
get_online_cpus();

ret = check_online_cpus();

\
 
 \ /
  Last update: 2018-04-11 00:48    [W:0.917 / U:0.032 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site