From: Borislav Petkov <bp@alien8.de>
To: Oliver Sang <oliver.sang@intel.com>,
Sean Christopherson <seanjc@google.com>
Cc: oe-lkp@lists.linux.dev, lkp@intel.com,
linux-kernel@vger.kernel.org, x86@kernel.org,
Ingo Molnar <mingo@kernel.org>,
Srikanth Aithal <sraithal@amd.com>,
fengwei.yin@intel.com, yujie.liu@intel.com
Subject: Re: [tip:x86/alternatives] [x86/alternatives] ee8962082a: WARNING:at_arch/x86/kernel/cpu/cpuid-deps.c:#do_clear_cpu_cap
Date: Wed, 8 May 2024 10:24:38 +0200 [thread overview]
Message-ID: <20240508082438.GBZjs2xsn4diYXU4ud@fat_crate.local> (raw)
In-Reply-To: <Zjsy8v0pZHPMkjPY@xsang-OptiPlex-9020>
On Wed, May 08, 2024 at 04:08:18PM +0800, Oliver Sang wrote:
> we really don't do any manual change recently, however, per your reminding,
> we rerun tests on both ee8962082a and its parent v6.9-rc3 again.
>
> while we made original report, we always saw below for both commits.
> "x86/cpu: VMX (outside TXT) disabled by BIOS"
>
> by rerun today, we cannot see it again, on both commits.
Yeah, from the last dump you shouldn't be seeing it.
> then for ee8962082a, the reported
> WARNING:at_arch/x86/kernel/cpu/cpuid-deps.c:#do_clear_cpu_cap
> disappeared also while no "x86/cpu: VMX (outside TXT) disabled by BIOS"
Yeah, it does feel like something underneath the OS has changed/is
changing for this to happen.
> we are using kexec to boot into kernel, and the kernel images keep same,
> so we are sure this strage phenomenon is not caused by kernel build.
Hmm, kexec won't go through BIOS so I can imagine if the kernel has left
FEAT_CTL in some weird state... but then if it has been locked, nothing
should change it anymore.
> now we doubt it's really a bios issue, we found another similar machine,
> which also show "x86/cpu: VMX (outside TXT) disabled by BIOS", but after
> several rounds of cold reboot, the message disappeared, too.
If you see that again, please run my branch with the debug patch - that
should at least tell us what's weird in FEAT_CTL.
> we will investigate this BIOS further and avoid this kind of misleading
> report in the future.
>
> sorry again :(
No worries, thanks for testing kernels and thanks Sean too. :-)
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
next prev parent reply other threads:[~2024-05-08 8:24 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-30 15:00 [tip:x86/alternatives] [x86/alternatives] ee8962082a: WARNING:at_arch/x86/kernel/cpu/cpuid-deps.c:#do_clear_cpu_cap kernel test robot
2024-04-30 17:23 ` Borislav Petkov
2024-04-30 18:40 ` Sean Christopherson
2024-04-30 19:32 ` Borislav Petkov
2024-04-30 19:51 ` Sean Christopherson
2024-04-30 22:33 ` Borislav Petkov
2024-05-04 12:48 ` Borislav Petkov
2024-05-04 12:49 ` [PATCH 1/2] x86/alternatives: Check the correct cpu_data's caps Borislav Petkov
2024-05-04 12:50 ` [PATCH 2/2] x86/CPU/Intel: Do the MSR_IA32_FEAT_CTL setup before alternatives Borislav Petkov
2024-05-06 7:09 ` [tip:x86/alternatives] [x86/alternatives] ee8962082a: WARNING:at_arch/x86/kernel/cpu/cpuid-deps.c:#do_clear_cpu_cap Oliver Sang
2024-05-06 7:39 ` Borislav Petkov
2024-05-06 8:01 ` Borislav Petkov
2024-05-06 8:12 ` Borislav Petkov
2024-05-07 2:29 ` Oliver Sang
2024-05-06 15:28 ` Sean Christopherson
2024-05-06 15:57 ` Borislav Petkov
2024-05-07 7:08 ` Oliver Sang
2024-05-07 11:48 ` Borislav Petkov
2024-05-07 17:09 ` Sean Christopherson
2024-05-08 8:08 ` Oliver Sang
2024-05-08 8:24 ` Borislav Petkov [this message]
2024-05-08 8:37 ` Oliver Sang
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