* [v2] arch/x86: Fix boot_cpu_data.microcode version output
@ 2018-07-31 11:27 ` Prarit Bhargava
0 siblings, 0 replies; 38+ messages in thread
From: Prarit Bhargava @ 2018-07-31 11:27 UTC (permalink / raw)
To: bp; +Cc: linux-edac, linux-kernel, sironi, tony.luck, Prarit Bhargava, stable
I tested this on AMD Ryzen & Intel Broadwell system and dumped the
boot_cpu_data before and after a microcode update. On the Intel
system I also did a fatal MCE using mce-inject to confirm the output
from the mce handling code.
P.
---8<---
On systems where a runtime microcode update has occurred the microcode
version output in a MCE log record is wrong because
boot_cpu_data.microcode is not updated during runtime.
Update boot_cpu_data.microcode when the BSP's microcode is updated.
Fixes: fa94d0c6e0f3 ("x86/MCE: Save microcode revision in machine check records")
Suggested-by: Borislav Petkov <bp@alien8.com>
Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Cc: stable@vger.kernel.org
Cc: sironi@amazon.de
Cc: tony.luck@intel.com
---
Changes in v2: Use mc_amd->hdr.patch_id on AMD
arch/x86/kernel/cpu/microcode/amd.c | 4 ++++
arch/x86/kernel/cpu/microcode/intel.c | 4 ++++
2 files changed, 8 insertions(+)
diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 0624957aa068..63b072377ba4 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -537,6 +537,10 @@ static enum ucode_state apply_microcode_amd(int cpu)
uci->cpu_sig.rev = mc_amd->hdr.patch_id;
c->microcode = mc_amd->hdr.patch_id;
+ /* Update boot_cpu_data's revision too, if we're on the BSP: */
+ if (c->cpu_index == boot_cpu_data.cpu_index)
+ boot_cpu_data.microcode = mc_amd->hdr.patch_id;
+
return UCODE_UPDATED;
}
diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 97ccf4c3b45b..256d336cbc04 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -851,6 +851,10 @@ static enum ucode_state apply_microcode_intel(int cpu)
uci->cpu_sig.rev = rev;
c->microcode = rev;
+ /* Update boot_cpu_data's revision too, if we're on the BSP: */
+ if (c->cpu_index == boot_cpu_data.cpu_index)
+ boot_cpu_data.microcode = rev;
+
return UCODE_UPDATED;
}
^ permalink raw reply related [flat|nested] 38+ messages in thread* Re: [PATCH v2] arch/x86: Fix boot_cpu_data.microcode version output
@ 2018-07-31 11:46 ` Filippo Sironi
0 siblings, 0 replies; 38+ messages in thread
From: Sironi, Filippo @ 2018-07-31 11:46 UTC (permalink / raw)
To: Prarit Bhargava; +Cc: bp, linux-edac, linux-kernel, tony.luck, stable
> On 31. Jul 2018, at 13:27, Prarit Bhargava <prarit@redhat.com> wrote:
>
> I tested this on AMD Ryzen & Intel Broadwell system and dumped the
> boot_cpu_data before and after a microcode update. On the Intel
> system I also did a fatal MCE using mce-inject to confirm the output
> from the mce handling code.
>
> P.
>
> ---8<---
>
> On systems where a runtime microcode update has occurred the microcode
> version output in a MCE log record is wrong because
> boot_cpu_data.microcode is not updated during runtime.
>
> Update boot_cpu_data.microcode when the BSP's microcode is updated.
>
> Fixes: fa94d0c6e0f3 ("x86/MCE: Save microcode revision in machine check records")
> Suggested-by: Borislav Petkov <bp@alien8.com>
> Signed-off-by: Prarit Bhargava <prarit@redhat.com>
> Cc: stable@vger.kernel.org
> Cc: sironi@amazon.de
> Cc: tony.luck@intel.com
> ---
> Changes in v2: Use mc_amd->hdr.patch_id on AMD
>
> arch/x86/kernel/cpu/microcode/amd.c | 4 ++++
> arch/x86/kernel/cpu/microcode/intel.c | 4 ++++
> 2 files changed, 8 insertions(+)
>
> diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
> index 0624957aa068..63b072377ba4 100644
> --- a/arch/x86/kernel/cpu/microcode/amd.c
> +++ b/arch/x86/kernel/cpu/microcode/amd.c
> @@ -537,6 +537,10 @@ static enum ucode_state apply_microcode_amd(int cpu)
> uci->cpu_sig.rev = mc_amd->hdr.patch_id;
> c->microcode = mc_amd->hdr.patch_id;
>
> + /* Update boot_cpu_data's revision too, if we're on the BSP: */
> + if (c->cpu_index == boot_cpu_data.cpu_index)
> + boot_cpu_data.microcode = mc_amd->hdr.patch_id;
> +
> return UCODE_UPDATED;
> }
>
> diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
> index 97ccf4c3b45b..256d336cbc04 100644
> --- a/arch/x86/kernel/cpu/microcode/intel.c
> +++ b/arch/x86/kernel/cpu/microcode/intel.c
> @@ -851,6 +851,10 @@ static enum ucode_state apply_microcode_intel(int cpu)
> uci->cpu_sig.rev = rev;
> c->microcode = rev;
>
> + /* Update boot_cpu_data's revision too, if we're on the BSP: */
> + if (c->cpu_index == boot_cpu_data.cpu_index)
> + boot_cpu_data.microcode = rev;
> +
> return UCODE_UPDATED;
> }
There may be a chance of skipping this code, I think.
If the microcode is loaded on the hyperthread sibling of the boot cpu
before being loaded on the boot cpu, the boot cpu will exit earlier
from apply_microcode_intel() - in if (rev >= mc->hdr.rev) { ... }.
(This seems to be possible in apply_microcode_amd() as well.)
In my tree with the aforementioned change - Intel only - I also had
the following patch:
diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 97ccf4c3b45b..4bc869e829eb 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -797,6 +797,7 @@ static enum ucode_state apply_microcode_intel(int cpu)
struct microcode_intel *mc;
static int prev_rev;
u32 rev;
+ enum ucode_state ret;
/* We should bind the task to the CPU */
if (WARN_ON(raw_smp_processor_id() != cpu))
@@ -817,9 +818,8 @@ static enum ucode_state apply_microcode_intel(int cpu)
*/
rev = intel_get_microcode_revision();
if (rev >= mc->hdr.rev) {
- uci->cpu_sig.rev = rev;
- c->microcode = rev;
- return UCODE_OK;
+ ret = UCODE_OK;
+ goto out;
}
/*
@@ -848,10 +848,12 @@ static enum ucode_state apply_microcode_intel(int cpu)
prev_rev = rev;
}
+ ret = UCODE_UPDATED;
+out:
uci->cpu_sig.rev = rev;
c->microcode = rev;
- return UCODE_UPDATED;
+ return ret;
}
static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size,
which prevents the issue.
> --
> 2.17.0
>
>
Amazon Development Center Germany GmbH
Berlin - Dresden - Aachen
main office: Krausenstr. 38, 10117 Berlin
Geschaeftsfuehrer: Dr. Ralf Herbrich, Christian Schlaeger
Ust-ID: DE289237879
Eingetragen am Amtsgericht Charlottenburg HRB 149173 B
^ permalink raw reply related [flat|nested] 38+ messages in thread* [v2] arch/x86: Fix boot_cpu_data.microcode version output
@ 2018-07-31 11:46 ` Filippo Sironi
0 siblings, 0 replies; 38+ messages in thread
From: Filippo Sironi @ 2018-07-31 11:46 UTC (permalink / raw)
To: Prarit Bhargava; +Cc: bp, linux-edac, linux-kernel, tony.luck, stable
> On 31. Jul 2018, at 13:27, Prarit Bhargava <prarit@redhat.com> wrote:
>
> I tested this on AMD Ryzen & Intel Broadwell system and dumped the
> boot_cpu_data before and after a microcode update. On the Intel
> system I also did a fatal MCE using mce-inject to confirm the output
> from the mce handling code.
>
> P.
>
> ---8<---
>
> On systems where a runtime microcode update has occurred the microcode
> version output in a MCE log record is wrong because
> boot_cpu_data.microcode is not updated during runtime.
>
> Update boot_cpu_data.microcode when the BSP's microcode is updated.
>
> Fixes: fa94d0c6e0f3 ("x86/MCE: Save microcode revision in machine check records")
> Suggested-by: Borislav Petkov <bp@alien8.com>
> Signed-off-by: Prarit Bhargava <prarit@redhat.com>
> Cc: stable@vger.kernel.org
> Cc: sironi@amazon.de
> Cc: tony.luck@intel.com
> ---
> Changes in v2: Use mc_amd->hdr.patch_id on AMD
>
> arch/x86/kernel/cpu/microcode/amd.c | 4 ++++
> arch/x86/kernel/cpu/microcode/intel.c | 4 ++++
> 2 files changed, 8 insertions(+)
>
> diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
> index 0624957aa068..63b072377ba4 100644
> --- a/arch/x86/kernel/cpu/microcode/amd.c
> +++ b/arch/x86/kernel/cpu/microcode/amd.c
> @@ -537,6 +537,10 @@ static enum ucode_state apply_microcode_amd(int cpu)
> uci->cpu_sig.rev = mc_amd->hdr.patch_id;
> c->microcode = mc_amd->hdr.patch_id;
>
> + /* Update boot_cpu_data's revision too, if we're on the BSP: */
> + if (c->cpu_index == boot_cpu_data.cpu_index)
> + boot_cpu_data.microcode = mc_amd->hdr.patch_id;
> +
> return UCODE_UPDATED;
> }
>
> diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
> index 97ccf4c3b45b..256d336cbc04 100644
> --- a/arch/x86/kernel/cpu/microcode/intel.c
> +++ b/arch/x86/kernel/cpu/microcode/intel.c
> @@ -851,6 +851,10 @@ static enum ucode_state apply_microcode_intel(int cpu)
> uci->cpu_sig.rev = rev;
> c->microcode = rev;
>
> + /* Update boot_cpu_data's revision too, if we're on the BSP: */
> + if (c->cpu_index == boot_cpu_data.cpu_index)
> + boot_cpu_data.microcode = rev;
> +
> return UCODE_UPDATED;
> }
There may be a chance of skipping this code, I think.
If the microcode is loaded on the hyperthread sibling of the boot cpu
before being loaded on the boot cpu, the boot cpu will exit earlier
from apply_microcode_intel() - in if (rev >= mc->hdr.rev) { ... }.
(This seems to be possible in apply_microcode_amd() as well.)
In my tree with the aforementioned change - Intel only - I also had
the following patch:
which prevents the issue.
> --
> 2.17.0
>
>
Amazon Development Center Germany GmbH
Berlin - Dresden - Aachen
main office: Krausenstr. 38, 10117 Berlin
Geschaeftsfuehrer: Dr. Ralf Herbrich, Christian Schlaeger
Ust-ID: DE289237879
Eingetragen am Amtsgericht Charlottenburg HRB 149173 B
---
To unsubscribe from this list: send the line "unsubscribe linux-edac" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 97ccf4c3b45b..4bc869e829eb 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -797,6 +797,7 @@ static enum ucode_state apply_microcode_intel(int cpu)
struct microcode_intel *mc;
static int prev_rev;
u32 rev;
+ enum ucode_state ret;
/* We should bind the task to the CPU */
if (WARN_ON(raw_smp_processor_id() != cpu))
@@ -817,9 +818,8 @@ static enum ucode_state apply_microcode_intel(int cpu)
*/
rev = intel_get_microcode_revision();
if (rev >= mc->hdr.rev) {
- uci->cpu_sig.rev = rev;
- c->microcode = rev;
- return UCODE_OK;
+ ret = UCODE_OK;
+ goto out;
}
/*
@@ -848,10 +848,12 @@ static enum ucode_state apply_microcode_intel(int cpu)
prev_rev = rev;
}
+ ret = UCODE_UPDATED;
+out:
uci->cpu_sig.rev = rev;
c->microcode = rev;
- return UCODE_UPDATED;
+ return ret;
}
static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size,
^ permalink raw reply related [flat|nested] 38+ messages in thread* Re: [PATCH v2] arch/x86: Fix boot_cpu_data.microcode version output
@ 2018-07-31 13:00 ` Borislav Petkov
0 siblings, 0 replies; 38+ messages in thread
From: Borislav Petkov @ 2018-07-31 13:00 UTC (permalink / raw)
To: Sironi, Filippo
Cc: Prarit Bhargava, linux-edac, linux-kernel, tony.luck, stable
On Tue, Jul 31, 2018 at 11:46:09AM +0000, Sironi, Filippo wrote:
> There may be a chance of skipping this code, I think.
>
> If the microcode is loaded on the hyperthread sibling of the boot cpu
> before being loaded on the boot cpu, the boot cpu will exit earlier
> from apply_microcode_intel() - in if (rev >= mc->hdr.rev) { ... }.
>
> (This seems to be possible in apply_microcode_amd() as well.)
>
> In my tree with the aforementioned change - Intel only - I also had
> the following patch:
Yap, good catch.
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
--
^ permalink raw reply [flat|nested] 38+ messages in thread* [v2] arch/x86: Fix boot_cpu_data.microcode version output
@ 2018-07-31 13:00 ` Borislav Petkov
0 siblings, 0 replies; 38+ messages in thread
From: Borislav Petkov @ 2018-07-31 13:00 UTC (permalink / raw)
To: Sironi, Filippo
Cc: Prarit Bhargava, linux-edac, linux-kernel, tony.luck, stable
On Tue, Jul 31, 2018 at 11:46:09AM +0000, Sironi, Filippo wrote:
> There may be a chance of skipping this code, I think.
>
> If the microcode is loaded on the hyperthread sibling of the boot cpu
> before being loaded on the boot cpu, the boot cpu will exit earlier
> from apply_microcode_intel() - in if (rev >= mc->hdr.rev) { ... }.
>
> (This seems to be possible in apply_microcode_amd() as well.)
>
> In my tree with the aforementioned change - Intel only - I also had
> the following patch:
Yap, good catch.
^ permalink raw reply [flat|nested] 38+ messages in thread* Re: [PATCH v2] arch/x86: Fix boot_cpu_data.microcode version output
@ 2018-07-31 15:31 ` Filippo Sironi
0 siblings, 0 replies; 38+ messages in thread
From: Sironi, Filippo @ 2018-07-31 15:31 UTC (permalink / raw)
To: Borislav Petkov
Cc: Prarit Bhargava, linux-edac, linux-kernel, tony.luck, stable
> On 31. Jul 2018, at 15:00, Borislav Petkov <bp@alien8.de> wrote:
>
> On Tue, Jul 31, 2018 at 11:46:09AM +0000, Sironi, Filippo wrote:
>> There may be a chance of skipping this code, I think.
>>
>> If the microcode is loaded on the hyperthread sibling of the boot cpu
>> before being loaded on the boot cpu, the boot cpu will exit earlier
>> from apply_microcode_intel() - in if (rev >= mc->hdr.rev) { ... }.
>>
>> (This seems to be possible in apply_microcode_amd() as well.)
>>
>> In my tree with the aforementioned change - Intel only - I also had
>> the following patch:
>
> Yap, good catch.
>
> --
> Regards/Gruss,
> Boris.
>
> ECO tip #101: Trim your mails when you reply.
> --
>
Boris, Prarit,
I've sent the patch the I had in my tree and extended it to cover
apply_microcode_amd(). I don't have an AMD host available for testing,
can one of you give that a spin?
Thanks,
Filippo
Amazon Development Center Germany GmbH
Berlin - Dresden - Aachen
main office: Krausenstr. 38, 10117 Berlin
Geschaeftsfuehrer: Dr. Ralf Herbrich, Christian Schlaeger
Ust-ID: DE289237879
Eingetragen am Amtsgericht Charlottenburg HRB 149173 B
^ permalink raw reply [flat|nested] 38+ messages in thread* [v2] arch/x86: Fix boot_cpu_data.microcode version output
@ 2018-07-31 15:31 ` Filippo Sironi
0 siblings, 0 replies; 38+ messages in thread
From: Filippo Sironi @ 2018-07-31 15:31 UTC (permalink / raw)
To: Borislav Petkov
Cc: Prarit Bhargava, linux-edac, linux-kernel, tony.luck, stable
> On 31. Jul 2018, at 15:00, Borislav Petkov <bp@alien8.de> wrote:
>
> On Tue, Jul 31, 2018 at 11:46:09AM +0000, Sironi, Filippo wrote:
>> There may be a chance of skipping this code, I think.
>>
>> If the microcode is loaded on the hyperthread sibling of the boot cpu
>> before being loaded on the boot cpu, the boot cpu will exit earlier
>> from apply_microcode_intel() - in if (rev >= mc->hdr.rev) { ... }.
>>
>> (This seems to be possible in apply_microcode_amd() as well.)
>>
>> In my tree with the aforementioned change - Intel only - I also had
>> the following patch:
>
> Yap, good catch.
>
> --
> Regards/Gruss,
> Boris.
>
> ECO tip #101: Trim your mails when you reply.
> --
>
Boris, Prarit,
I've sent the patch the I had in my tree and extended it to cover
apply_microcode_amd(). I don't have an AMD host available for testing,
can one of you give that a spin?
Thanks,
Filippo
Amazon Development Center Germany GmbH
Berlin - Dresden - Aachen
main office: Krausenstr. 38, 10117 Berlin
Geschaeftsfuehrer: Dr. Ralf Herbrich, Christian Schlaeger
Ust-ID: DE289237879
Eingetragen am Amtsgericht Charlottenburg HRB 149173 B
---
To unsubscribe from this list: send the line "unsubscribe linux-edac" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
^ permalink raw reply [flat|nested] 38+ messages in thread
* Re: [PATCH v2] arch/x86: Fix boot_cpu_data.microcode version output
@ 2018-08-01 15:43 ` Borislav Petkov
0 siblings, 0 replies; 38+ messages in thread
From: Borislav Petkov @ 2018-08-01 15:43 UTC (permalink / raw)
To: Prarit Bhargava; +Cc: linux-edac, linux-kernel, sironi, tony.luck
(dropping stable@)
On Tue, Jul 31, 2018 at 07:27:39AM -0400, Prarit Bhargava wrote:
> I tested this on AMD Ryzen & Intel Broadwell system and dumped the
> boot_cpu_data before and after a microcode update. On the Intel
> system I also did a fatal MCE using mce-inject to confirm the output
> from the mce handling code.
Ok, sending the two patches I've massaged into submission as a reply to
this message - please run them on your boxes. You can also inject MCEs
on the AMD box to verify - simply enable CONFIG_X86_MCE_INJECT, go to
debugfs and do, for example:
cd /sys/kernel/debug/mce-inject/
echo 10 > /sys/devices/system/machinecheck/machinecheck0/check_interval
echo 0x9c7d410092080813 > status; echo 0x000000006d3d483b > addr; echo 2 > cpu; echo 4 > bank; echo hw > flags
echo 0xbc00200000010015 > status; echo 0x00000000942e4d98 > addr; echo 6 > cpu; echo 2 > bank; echo hw > flags
echo 0xfe000010000b0c0f > status; echo 0xe1101add1e550012 > addr; echo 0xcafebeef > misc; echo 2 > cpu; echo hw > flags; echo 4 > bank
Thanks!
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
--
^ permalink raw reply [flat|nested] 38+ messages in thread* [v2] arch/x86: Fix boot_cpu_data.microcode version output
@ 2018-08-01 15:43 ` Borislav Petkov
0 siblings, 0 replies; 38+ messages in thread
From: Borislav Petkov @ 2018-08-01 15:43 UTC (permalink / raw)
To: Prarit Bhargava; +Cc: linux-edac, linux-kernel, sironi, tony.luck
(dropping stable@)
On Tue, Jul 31, 2018 at 07:27:39AM -0400, Prarit Bhargava wrote:
> I tested this on AMD Ryzen & Intel Broadwell system and dumped the
> boot_cpu_data before and after a microcode update. On the Intel
> system I also did a fatal MCE using mce-inject to confirm the output
> from the mce handling code.
Ok, sending the two patches I've massaged into submission as a reply to
this message - please run them on your boxes. You can also inject MCEs
on the AMD box to verify - simply enable CONFIG_X86_MCE_INJECT, go to
debugfs and do, for example:
cd /sys/kernel/debug/mce-inject/
echo 10 > /sys/devices/system/machinecheck/machinecheck0/check_interval
echo 0x9c7d410092080813 > status; echo 0x000000006d3d483b > addr; echo 2 > cpu; echo 4 > bank; echo hw > flags
echo 0xbc00200000010015 > status; echo 0x00000000942e4d98 > addr; echo 6 > cpu; echo 2 > bank; echo hw > flags
echo 0xfe000010000b0c0f > status; echo 0xe1101add1e550012 > addr; echo 0xcafebeef > misc; echo 2 > cpu; echo hw > flags; echo 4 > bank
Thanks!
^ permalink raw reply [flat|nested] 38+ messages in thread
* [PATCH 1/2] x86/microcode: Make sure boot_cpu_data.microcode is up-to-date
@ 2018-08-01 15:44 ` Borislav Petkov
0 siblings, 0 replies; 38+ messages in thread
From: Borislav Petkov @ 2018-08-01 15:44 UTC (permalink / raw)
To: Prarit Bhargava; +Cc: linux-edac, linux-kernel, sironi, tony.luck
From: Prarit Bhargava <prarit@redhat.com>
The MCE code uses boot_cpu_data.microcode to prepare the MCE record.
However, on systems where late microcode update has occurred, the
microcode revision output in a MCE log record is wrong because
boot_cpu_data.microcode is not updated when the microcode gets updated.
However, the microcode revision saved in boot_cpu_data's microcode
member should be kept up-to-date, regardless, for consistency.
Make it so.
Fixes: fa94d0c6e0f3 ("x86/MCE: Save microcode revision in machine check records")
Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: sironi@amazon.de
Cc: stable@vger.kernel.org
Cc: x86-ml <x86@kernel.org>
Link: http://lkml.kernel.org/r/20180731112739.32338-1-prarit@redhat.com
[ Make commit message more precise. ]
Signed-off-by: Borislav Petkov <bp@suse.de>
---
arch/x86/kernel/cpu/microcode/amd.c | 4 ++++
arch/x86/kernel/cpu/microcode/intel.c | 4 ++++
2 files changed, 8 insertions(+)
diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 0624957aa068..63b072377ba4 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -537,6 +537,10 @@ static enum ucode_state apply_microcode_amd(int cpu)
uci->cpu_sig.rev = mc_amd->hdr.patch_id;
c->microcode = mc_amd->hdr.patch_id;
+ /* Update boot_cpu_data's revision too, if we're on the BSP: */
+ if (c->cpu_index == boot_cpu_data.cpu_index)
+ boot_cpu_data.microcode = mc_amd->hdr.patch_id;
+
return UCODE_UPDATED;
}
diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 97ccf4c3b45b..256d336cbc04 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -851,6 +851,10 @@ static enum ucode_state apply_microcode_intel(int cpu)
uci->cpu_sig.rev = rev;
c->microcode = rev;
+ /* Update boot_cpu_data's revision too, if we're on the BSP: */
+ if (c->cpu_index == boot_cpu_data.cpu_index)
+ boot_cpu_data.microcode = rev;
+
return UCODE_UPDATED;
}
--
2.18.0.321.gffc6fa0e3962
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
--
^ permalink raw reply related [flat|nested] 38+ messages in thread* [1/2] x86/microcode: Make sure boot_cpu_data.microcode is up-to-date
@ 2018-08-01 15:44 ` Borislav Petkov
0 siblings, 0 replies; 38+ messages in thread
From: Borislav Petkov @ 2018-08-01 15:44 UTC (permalink / raw)
To: Prarit Bhargava; +Cc: linux-edac, linux-kernel, sironi, tony.luck
From: Prarit Bhargava <prarit@redhat.com>
The MCE code uses boot_cpu_data.microcode to prepare the MCE record.
However, on systems where late microcode update has occurred, the
microcode revision output in a MCE log record is wrong because
boot_cpu_data.microcode is not updated when the microcode gets updated.
However, the microcode revision saved in boot_cpu_data's microcode
member should be kept up-to-date, regardless, for consistency.
Make it so.
Fixes: fa94d0c6e0f3 ("x86/MCE: Save microcode revision in machine check records")
Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: sironi@amazon.de
Cc: stable@vger.kernel.org
Cc: x86-ml <x86@kernel.org>
Link: http://lkml.kernel.org/r/20180731112739.32338-1-prarit@redhat.com
[ Make commit message more precise. ]
Signed-off-by: Borislav Petkov <bp@suse.de>
---
arch/x86/kernel/cpu/microcode/amd.c | 4 ++++
arch/x86/kernel/cpu/microcode/intel.c | 4 ++++
2 files changed, 8 insertions(+)
diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 0624957aa068..63b072377ba4 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -537,6 +537,10 @@ static enum ucode_state apply_microcode_amd(int cpu)
uci->cpu_sig.rev = mc_amd->hdr.patch_id;
c->microcode = mc_amd->hdr.patch_id;
+ /* Update boot_cpu_data's revision too, if we're on the BSP: */
+ if (c->cpu_index == boot_cpu_data.cpu_index)
+ boot_cpu_data.microcode = mc_amd->hdr.patch_id;
+
return UCODE_UPDATED;
}
diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 97ccf4c3b45b..256d336cbc04 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -851,6 +851,10 @@ static enum ucode_state apply_microcode_intel(int cpu)
uci->cpu_sig.rev = rev;
c->microcode = rev;
+ /* Update boot_cpu_data's revision too, if we're on the BSP: */
+ if (c->cpu_index == boot_cpu_data.cpu_index)
+ boot_cpu_data.microcode = rev;
+
return UCODE_UPDATED;
}
^ permalink raw reply related [flat|nested] 38+ messages in thread
* [PATCH 2/2] x86/microcode: Update the new microcode revision unconditionally
@ 2018-08-01 15:45 ` Borislav Petkov
0 siblings, 0 replies; 38+ messages in thread
From: Borislav Petkov @ 2018-08-01 15:45 UTC (permalink / raw)
To: Prarit Bhargava; +Cc: linux-edac, linux-kernel, sironi, tony.luck
From: Filippo Sironi <sironi@amazon.de>
Handle the case where microcode gets loaded on the BSP's hyperthread
sibling first and the boot_cpu_data's microcode revision doesn't get
updated because of early exit due to the siblings sharing a microcode
engine.
For that, simply write the updated revision on all CPUs unconditionally.
Signed-off-by: Filippo Sironi <sironi@amazon.de>
Cc: prarit@redhat.com
Cc: stable@vger.kernel.org
Cc: x86-ml <x86@kernel.org>
Link: http://lkml.kernel.org/r/1533050970-14385-1-git-send-email-sironi@amazon.de
[ Massage everything a bit. ]
Signed-off-by: Borislav Petkov <bp@suse.de>
---
arch/x86/kernel/cpu/microcode/amd.c | 22 +++++++++++++---------
arch/x86/kernel/cpu/microcode/intel.c | 13 ++++++++-----
2 files changed, 21 insertions(+), 14 deletions(-)
diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 63b072377ba4..07b5fc00b188 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -504,6 +504,7 @@ static enum ucode_state apply_microcode_amd(int cpu)
struct microcode_amd *mc_amd;
struct ucode_cpu_info *uci;
struct ucode_patch *p;
+ enum ucode_state ret;
u32 rev, dummy;
BUG_ON(raw_smp_processor_id() != cpu);
@@ -521,9 +522,8 @@ static enum ucode_state apply_microcode_amd(int cpu)
/* need to apply patch? */
if (rev >= mc_amd->hdr.patch_id) {
- c->microcode = rev;
- uci->cpu_sig.rev = rev;
- return UCODE_OK;
+ ret = UCODE_OK;
+ goto out;
}
if (__apply_microcode_amd(mc_amd)) {
@@ -531,17 +531,21 @@ static enum ucode_state apply_microcode_amd(int cpu)
cpu, mc_amd->hdr.patch_id);
return UCODE_ERROR;
}
- pr_info("CPU%d: new patch_level=0x%08x\n", cpu,
- mc_amd->hdr.patch_id);
- uci->cpu_sig.rev = mc_amd->hdr.patch_id;
- c->microcode = mc_amd->hdr.patch_id;
+ rev = mc_amd->hdr.patch_id;
+ ret = UCODE_UPDATED;
+
+ pr_info("CPU%d: new patch_level=0x%08x\n", cpu, rev);
+
+out:
+ uci->cpu_sig.rev = rev;
+ c->microcode = rev;
/* Update boot_cpu_data's revision too, if we're on the BSP: */
if (c->cpu_index == boot_cpu_data.cpu_index)
- boot_cpu_data.microcode = mc_amd->hdr.patch_id;
+ boot_cpu_data.microcode = rev;
- return UCODE_UPDATED;
+ return ret;
}
static int install_equiv_cpu_table(const u8 *buf)
diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 256d336cbc04..16936a24795c 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -795,6 +795,7 @@ static enum ucode_state apply_microcode_intel(int cpu)
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
struct cpuinfo_x86 *c = &cpu_data(cpu);
struct microcode_intel *mc;
+ enum ucode_state ret;
static int prev_rev;
u32 rev;
@@ -817,9 +818,8 @@ static enum ucode_state apply_microcode_intel(int cpu)
*/
rev = intel_get_microcode_revision();
if (rev >= mc->hdr.rev) {
- uci->cpu_sig.rev = rev;
- c->microcode = rev;
- return UCODE_OK;
+ ret = UCODE_OK;
+ goto out;
}
/*
@@ -848,14 +848,17 @@ static enum ucode_state apply_microcode_intel(int cpu)
prev_rev = rev;
}
+ ret = UCODE_UPDATED;
+
+out:
uci->cpu_sig.rev = rev;
- c->microcode = rev;
+ c->microcode = rev;
/* Update boot_cpu_data's revision too, if we're on the BSP: */
if (c->cpu_index == boot_cpu_data.cpu_index)
boot_cpu_data.microcode = rev;
- return UCODE_UPDATED;
+ return ret;
}
static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size,
--
2.18.0.321.gffc6fa0e3962
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
--
^ permalink raw reply related [flat|nested] 38+ messages in thread* [2/2] x86/microcode: Update the new microcode revision unconditionally
@ 2018-08-01 15:45 ` Borislav Petkov
0 siblings, 0 replies; 38+ messages in thread
From: Borislav Petkov @ 2018-08-01 15:45 UTC (permalink / raw)
To: Prarit Bhargava; +Cc: linux-edac, linux-kernel, sironi, tony.luck
From: Filippo Sironi <sironi@amazon.de>
Handle the case where microcode gets loaded on the BSP's hyperthread
sibling first and the boot_cpu_data's microcode revision doesn't get
updated because of early exit due to the siblings sharing a microcode
engine.
For that, simply write the updated revision on all CPUs unconditionally.
Signed-off-by: Filippo Sironi <sironi@amazon.de>
Cc: prarit@redhat.com
Cc: stable@vger.kernel.org
Cc: x86-ml <x86@kernel.org>
Link: http://lkml.kernel.org/r/1533050970-14385-1-git-send-email-sironi@amazon.de
[ Massage everything a bit. ]
Signed-off-by: Borislav Petkov <bp@suse.de>
---
arch/x86/kernel/cpu/microcode/amd.c | 22 +++++++++++++---------
arch/x86/kernel/cpu/microcode/intel.c | 13 ++++++++-----
2 files changed, 21 insertions(+), 14 deletions(-)
diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 63b072377ba4..07b5fc00b188 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -504,6 +504,7 @@ static enum ucode_state apply_microcode_amd(int cpu)
struct microcode_amd *mc_amd;
struct ucode_cpu_info *uci;
struct ucode_patch *p;
+ enum ucode_state ret;
u32 rev, dummy;
BUG_ON(raw_smp_processor_id() != cpu);
@@ -521,9 +522,8 @@ static enum ucode_state apply_microcode_amd(int cpu)
/* need to apply patch? */
if (rev >= mc_amd->hdr.patch_id) {
- c->microcode = rev;
- uci->cpu_sig.rev = rev;
- return UCODE_OK;
+ ret = UCODE_OK;
+ goto out;
}
if (__apply_microcode_amd(mc_amd)) {
@@ -531,17 +531,21 @@ static enum ucode_state apply_microcode_amd(int cpu)
cpu, mc_amd->hdr.patch_id);
return UCODE_ERROR;
}
- pr_info("CPU%d: new patch_level=0x%08x\n", cpu,
- mc_amd->hdr.patch_id);
- uci->cpu_sig.rev = mc_amd->hdr.patch_id;
- c->microcode = mc_amd->hdr.patch_id;
+ rev = mc_amd->hdr.patch_id;
+ ret = UCODE_UPDATED;
+
+ pr_info("CPU%d: new patch_level=0x%08x\n", cpu, rev);
+
+out:
+ uci->cpu_sig.rev = rev;
+ c->microcode = rev;
/* Update boot_cpu_data's revision too, if we're on the BSP: */
if (c->cpu_index == boot_cpu_data.cpu_index)
- boot_cpu_data.microcode = mc_amd->hdr.patch_id;
+ boot_cpu_data.microcode = rev;
- return UCODE_UPDATED;
+ return ret;
}
static int install_equiv_cpu_table(const u8 *buf)
diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 256d336cbc04..16936a24795c 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -795,6 +795,7 @@ static enum ucode_state apply_microcode_intel(int cpu)
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
struct cpuinfo_x86 *c = &cpu_data(cpu);
struct microcode_intel *mc;
+ enum ucode_state ret;
static int prev_rev;
u32 rev;
@@ -817,9 +818,8 @@ static enum ucode_state apply_microcode_intel(int cpu)
*/
rev = intel_get_microcode_revision();
if (rev >= mc->hdr.rev) {
- uci->cpu_sig.rev = rev;
- c->microcode = rev;
- return UCODE_OK;
+ ret = UCODE_OK;
+ goto out;
}
/*
@@ -848,14 +848,17 @@ static enum ucode_state apply_microcode_intel(int cpu)
prev_rev = rev;
}
+ ret = UCODE_UPDATED;
+
+out:
uci->cpu_sig.rev = rev;
- c->microcode = rev;
+ c->microcode = rev;
/* Update boot_cpu_data's revision too, if we're on the BSP: */
if (c->cpu_index == boot_cpu_data.cpu_index)
boot_cpu_data.microcode = rev;
- return UCODE_UPDATED;
+ return ret;
}
static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size,
^ permalink raw reply related [flat|nested] 38+ messages in thread
* Re: [PATCH v2] arch/x86: Fix boot_cpu_data.microcode version output
@ 2018-08-01 15:55 ` Prarit Bhargava
0 siblings, 0 replies; 38+ messages in thread
From: Prarit Bhargava @ 2018-08-01 15:55 UTC (permalink / raw)
To: Borislav Petkov
Cc: linux-edac, linux-kernel, sironi, tony.luck, Oleksandr Natalenko
On 08/01/2018 11:43 AM, Borislav Petkov wrote:
> (dropping stable@)
>
> On Tue, Jul 31, 2018 at 07:27:39AM -0400, Prarit Bhargava wrote:
>> I tested this on AMD Ryzen & Intel Broadwell system and dumped the
>> boot_cpu_data before and after a microcode update. On the Intel
>> system I also did a fatal MCE using mce-inject to confirm the output
>> from the mce handling code.
>
> Ok, sending the two patches I've massaged into submission as a reply to
> this message - please run them on your boxes. You can also inject MCEs
> on the AMD box to verify - simply enable CONFIG_X86_MCE_INJECT, go to
> debugfs and do, for example:
>
> cd /sys/kernel/debug/mce-inject/
> echo 10 > /sys/devices/system/machinecheck/machinecheck0/check_interval
> echo 0x9c7d410092080813 > status; echo 0x000000006d3d483b > addr; echo 2 > cpu; echo 4 > bank; echo hw > flags
> echo 0xbc00200000010015 > status; echo 0x00000000942e4d98 > addr; echo 6 > cpu; echo 2 > bank; echo hw > flags
> echo 0xfe000010000b0c0f > status; echo 0xe1101add1e550012 > addr; echo 0xcafebeef > misc; echo 2 > cpu; echo hw > flags; echo 4 > bank
>
Borislav, I'm not sure if you saw his comments but Oleksandr, cc'd, has an
objection to overwriting the stored microcode version in boot_cpu_data. He has
found that information useful in debugging microcode issues.
P.
> Thanks!
>
^ permalink raw reply [flat|nested] 38+ messages in thread
* [v2] arch/x86: Fix boot_cpu_data.microcode version output
@ 2018-08-01 15:55 ` Prarit Bhargava
0 siblings, 0 replies; 38+ messages in thread
From: Prarit Bhargava @ 2018-08-01 15:55 UTC (permalink / raw)
To: Borislav Petkov
Cc: linux-edac, linux-kernel, sironi, tony.luck, Oleksandr Natalenko
On 08/01/2018 11:43 AM, Borislav Petkov wrote:
> (dropping stable@)
>
> On Tue, Jul 31, 2018 at 07:27:39AM -0400, Prarit Bhargava wrote:
>> I tested this on AMD Ryzen & Intel Broadwell system and dumped the
>> boot_cpu_data before and after a microcode update. On the Intel
>> system I also did a fatal MCE using mce-inject to confirm the output
>> from the mce handling code.
>
> Ok, sending the two patches I've massaged into submission as a reply to
> this message - please run them on your boxes. You can also inject MCEs
> on the AMD box to verify - simply enable CONFIG_X86_MCE_INJECT, go to
> debugfs and do, for example:
>
> cd /sys/kernel/debug/mce-inject/
> echo 10 > /sys/devices/system/machinecheck/machinecheck0/check_interval
> echo 0x9c7d410092080813 > status; echo 0x000000006d3d483b > addr; echo 2 > cpu; echo 4 > bank; echo hw > flags
> echo 0xbc00200000010015 > status; echo 0x00000000942e4d98 > addr; echo 6 > cpu; echo 2 > bank; echo hw > flags
> echo 0xfe000010000b0c0f > status; echo 0xe1101add1e550012 > addr; echo 0xcafebeef > misc; echo 2 > cpu; echo hw > flags; echo 4 > bank
>
Borislav, I'm not sure if you saw his comments but Oleksandr, cc'd, has an
objection to overwriting the stored microcode version in boot_cpu_data. He has
found that information useful in debugging microcode issues.
P.
> Thanks!
>
---
To unsubscribe from this list: send the line "unsubscribe linux-edac" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
^ permalink raw reply [flat|nested] 38+ messages in thread
* [tip:x86/urgent] x86/microcode: Make sure boot_cpu_data.microcode is up-to-date
2018-07-31 11:27 ` [v2] " Prarit Bhargava
` (2 preceding siblings ...)
(?)
@ 2018-09-02 12:15 ` tip-bot for Prarit Bhargava
-1 siblings, 0 replies; 38+ messages in thread
From: tip-bot for Prarit Bhargava @ 2018-09-02 12:15 UTC (permalink / raw)
To: linux-tip-commits; +Cc: tglx, bp, tony.luck, linux-kernel, hpa, prarit, mingo
Commit-ID: 370a132bb2227ff76278f98370e0e701d86ff752
Gitweb: https://git.kernel.org/tip/370a132bb2227ff76278f98370e0e701d86ff752
Author: Prarit Bhargava <prarit@redhat.com>
AuthorDate: Tue, 31 Jul 2018 07:27:39 -0400
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Sun, 2 Sep 2018 14:10:54 +0200
x86/microcode: Make sure boot_cpu_data.microcode is up-to-date
When preparing an MCE record for logging, boot_cpu_data.microcode is used
to read out the microcode revision on the box.
However, on systems where late microcode update has happened, the microcode
revision output in a MCE log record is wrong because
boot_cpu_data.microcode is not updated when the microcode gets updated.
But, the microcode revision saved in boot_cpu_data's microcode member
should be kept up-to-date, regardless, for consistency.
Make it so.
Fixes: fa94d0c6e0f3 ("x86/MCE: Save microcode revision in machine check records")
Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: sironi@amazon.de
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/20180731112739.32338-1-prarit@redhat.com
---
arch/x86/kernel/cpu/microcode/amd.c | 4 ++++
arch/x86/kernel/cpu/microcode/intel.c | 4 ++++
2 files changed, 8 insertions(+)
diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 0624957aa068..602f17134103 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -537,6 +537,10 @@ static enum ucode_state apply_microcode_amd(int cpu)
uci->cpu_sig.rev = mc_amd->hdr.patch_id;
c->microcode = mc_amd->hdr.patch_id;
+ /* Update boot_cpu_data's revision too, if we're on the BSP: */
+ if (c->cpu_index == boot_cpu_data.cpu_index)
+ boot_cpu_data.microcode = mc_amd->hdr.patch_id;
+
return UCODE_UPDATED;
}
diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 97ccf4c3b45b..256d336cbc04 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -851,6 +851,10 @@ static enum ucode_state apply_microcode_intel(int cpu)
uci->cpu_sig.rev = rev;
c->microcode = rev;
+ /* Update boot_cpu_data's revision too, if we're on the BSP: */
+ if (c->cpu_index == boot_cpu_data.cpu_index)
+ boot_cpu_data.microcode = rev;
+
return UCODE_UPDATED;
}
^ permalink raw reply related [flat|nested] 38+ messages in thread