From: Borislav Petkov <bp@suse.de>
To: Vitezslav Samel <vitezslav@samel.cz>
Cc: "Raj, Ashok" <ashok.raj@intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-kernel@vger.kernel.org
Subject: Re: 4.15.17 regression: bisected: timeout during microcode update
Date: Thu, 19 Apr 2018 12:48:29 +0200 [thread overview]
Message-ID: <20180419104829.GE3896@pd.tnic> (raw)
In-Reply-To: <20180419053531.GA2224@pc11.op.pod.cz>
On Thu, Apr 19, 2018 at 07:35:31AM +0200, Vitezslav Samel wrote:
> > - Can you remove your builtin microcode,
> > - rename the /lib/firmware/intel-ucode so we don't find it during late loading.
> > - let the system boot completely
> > - then rename the intel-ucode back for this test.
> > - write 1 to reload and see if that update succeeds or fails?
>
> Just tested, it fails.
Can you apply the below patch, do the exact same exercise and catch the
output? Over serial console or netconsole or if nothing else, do a video
of the screen with a phone and upload it somewhere?
Thx.
---
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index 10c4fc2c91f8..374ec1d75d89 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -553,6 +553,8 @@ static int __reload_late(void *info)
enum ucode_state err;
int ret = 0;
+ pr_info("%s: CPU%d\n", __func__, cpu);
+
/*
* Wait for all CPUs to arrive. A load will not be attempted unless all
* CPUs show up.
@@ -560,6 +562,8 @@ static int __reload_late(void *info)
if (__wait_for_cpus(&late_cpus_in, NSEC_PER_SEC))
return -1;
+ pr_info("%s: CPU%d reloading\n", __func__, cpu);
+
spin_lock(&update_lock);
apply_microcode_local(&err);
spin_unlock(&update_lock);
@@ -571,9 +575,12 @@ static int __reload_late(void *info)
} else if (err == UCODE_UPDATED || err == UCODE_OK) {
ret = 1;
} else {
+ pr_info("%s: CPU%d returning 0x%x\n", __func__, cpu, ret);
return ret;
}
+ pr_info("%s: CPU%d waiting to exit\n", __func__, cpu);
+
/*
* Increase the wait timeout to a safe value here since we're
* serializing the microcode update and that could take a while on a
--
Regards/Gruss,
Boris.
SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--
next prev parent reply other threads:[~2018-04-19 10:48 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-18 8:11 4.15.17 regression: bisected: timeout during microcode update Vitezslav Samel
2018-04-18 10:07 ` Borislav Petkov
2018-04-18 12:08 ` Vitezslav Samel
2018-04-18 12:22 ` Borislav Petkov
2018-04-18 13:53 ` Raj, Ashok
2018-04-18 16:14 ` Borislav Petkov
2018-04-19 5:35 ` Vitezslav Samel
2018-04-19 7:22 ` Raj, Ashok
2018-04-19 10:48 ` Borislav Petkov [this message]
2018-04-19 12:02 ` Vitezslav Samel
2018-04-19 12:18 ` Borislav Petkov
2018-04-19 12:32 ` Raj, Ashok
2018-04-19 13:48 ` Vitezslav Samel
2018-04-19 13:46 ` Vitezslav Samel
2018-04-19 16:37 ` Borislav Petkov
2018-04-20 6:20 ` Vitezslav Samel
2018-04-20 9:52 ` Borislav Petkov
2018-04-20 10:01 ` Vitezslav Samel
2018-04-20 10:32 ` Borislav Petkov
2018-04-20 10:34 ` [PATCH 1/2] x86/microcode/intel: Save microcode patch unconditionally Borislav Petkov
2018-04-20 10:54 ` Vitezslav Samel
2018-04-20 15:59 ` Raj, Ashok
2018-04-20 10:37 ` [PATCH 2/2] x86/microcode: Do not exit early from __reload_late() Borislav Petkov
2018-04-20 10:54 ` Vitezslav Samel
2018-04-20 16:00 ` Raj, Ashok
2018-04-21 8:19 ` [PATCH 1/2] x86/microcode/intel: Save microcode patch unconditionally Borislav Petkov
2018-04-21 8:19 ` [PATCH 2/2] x86/microcode: Do not exit early from __reload_late() Borislav Petkov
2018-04-24 7:52 ` [tip:x86/urgent] " tip-bot for Borislav Petkov
2018-04-24 7:51 ` [tip:x86/urgent] x86/microcode/intel: Save microcode patch unconditionally tip-bot for Borislav Petkov
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