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x86/microcode: Request microcode on the BSP

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... 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
This commit is contained in:
Borislav Petkov 2018-02-28 11:28:45 +01:00 committed by Thomas Gleixner
parent d8c3b52c00
commit cfb52a5a09
1 changed files with 5 additions and 6 deletions
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11
arch/x86/kernel/cpu/microcode/core.c
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@ -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 device *dev,
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 device *dev,
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();