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author | Otavio Pontes <otavio.pontes@intel.com> | 2021-03-19 09:55:15 -0700 |
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committer | Borislav Petkov <bp@suse.de> | 2021-03-22 22:29:40 +0100 |
commit | 7189b3c11903667808029ec9766a6e96de5012a5 (patch) | |
tree | fc3eba2b1c9e778fbcc69e4cba416887d2de15a5 /arch/x86/kernel/cpu | |
parent | 0d02ec6b3136c73c09e7859f0d0e4e2c4c07b49b (diff) | |
download | linux-stable-7189b3c11903667808029ec9766a6e96de5012a5.tar.gz linux-stable-7189b3c11903667808029ec9766a6e96de5012a5.tar.bz2 linux-stable-7189b3c11903667808029ec9766a6e96de5012a5.zip |
x86/microcode: Check for offline CPUs before requesting new microcode
Currently, the late microcode loading mechanism checks whether any CPUs
are offlined, and, in such a case, aborts the load attempt.
However, this must be done before the kernel caches new microcode from
the filesystem. Otherwise, when offlined CPUs are onlined later, those
cores are going to be updated through the CPU hotplug notifier callback
with the new microcode, while CPUs previously onine will continue to run
with the older microcode.
For example:
Turn off one core (2 threads):
echo 0 > /sys/devices/system/cpu/cpu3/online
echo 0 > /sys/devices/system/cpu/cpu1/online
Install the ucode fails because a primary SMT thread is offline:
cp intel-ucode/06-8e-09 /lib/firmware/intel-ucode/
echo 1 > /sys/devices/system/cpu/microcode/reload
bash: echo: write error: Invalid argument
Turn the core back on
echo 1 > /sys/devices/system/cpu/cpu3/online
echo 1 > /sys/devices/system/cpu/cpu1/online
cat /proc/cpuinfo |grep microcode
microcode : 0x30
microcode : 0xde
microcode : 0x30
microcode : 0xde
The rationale for why the update is aborted when at least one primary
thread is offline is because even if that thread is soft-offlined
and idle, it will still have to participate in broadcasted MCE's
synchronization dance or enter SMM, and in both examples it will execute
instructions so it better have the same microcode revision as the other
cores.
[ bp: Heavily edit and extend commit message with the reasoning behind all
this. ]
Fixes: 30ec26da9967 ("x86/microcode: Do not upload microcode if CPUs are offline")
Signed-off-by: Otavio Pontes <otavio.pontes@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Acked-by: Ashok Raj <ashok.raj@intel.com>
Link: https://lkml.kernel.org/r/20210319165515.9240-2-otavio.pontes@intel.com
Diffstat (limited to 'arch/x86/kernel/cpu')
-rw-r--r-- | arch/x86/kernel/cpu/microcode/core.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c index b935e1b5f115..6a6318e9590c 100644 --- a/arch/x86/kernel/cpu/microcode/core.c +++ b/arch/x86/kernel/cpu/microcode/core.c @@ -629,16 +629,16 @@ static ssize_t reload_store(struct device *dev, if (val != 1) return size; - tmp_ret = microcode_ops->request_microcode_fw(bsp, µcode_pdev->dev, true); - if (tmp_ret != UCODE_NEW) - return size; - get_online_cpus(); ret = check_online_cpus(); if (ret) goto put; + tmp_ret = microcode_ops->request_microcode_fw(bsp, µcode_pdev->dev, true); + if (tmp_ret != UCODE_NEW) + goto put; + mutex_lock(µcode_mutex); ret = microcode_reload_late(); mutex_unlock(µcode_mutex); |