From: Juergen Gross <jgross@suse.com>
To: Borislav Petkov <bp@alien8.de>
Cc: xen-devel@lists.xenproject.org, x86@kernel.org,
linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
"H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH v3 08/10] x86/mtrr: let cache_aps_delayed_init replace mtrr_aps_delayed_init
Date: Wed, 28 Sep 2022 18:32:20 +0200 [thread overview]
Message-ID: <6d37c273-423c-fdce-c140-e5b90d723b9e@suse.com> (raw)
In-Reply-To: <YzRyaLRqWd6YSgeJ@zn.tnic>
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On 28.09.22 18:12, Borislav Petkov wrote:
> On Wed, Sep 28, 2022 at 03:43:56PM +0200, Juergen Gross wrote:
>> Would you feel better with adding a new enum member CPUHP_AP_CACHECTRL_ONLINE?
>>
>> This would avoid a possible source of failure during resume in case no slot
>> for CPUHP_AP_ONLINE_DYN is found (quite improbable, but in theory possible).
>
> Let's keep that in the bag for the time when we get to cross that bridge.
>
>> You wouldn't want to do that there, as there are multiple places where
>> pm_sleep_enable_secondary_cpus() is being called.
>
> We want all of them, I'd say. They're all some sort of suspend AFAICT.
> But yes, if we get to do it, that would need a proper audit.
>
>> Additionally not all cases are coming in via
>> pm_sleep_enable_secondary_cpus(), as there is e.g. a call of
>> suspend_enable_secondary_cpus() from kernel_kexec(), which wants to
>> have the same handling.
>
> Which means, more hairy.
>
>> arch_thaw_secondary_cpus_begin() and arch_thaw_secondary_cpus_end() are
>> the functions to mark start and end of the special region where the
>> delayed MTRR setup should happen.
>
> Yap, it seems like the best solution at the moment. Want me to do a
> proper patch and test it on real hw?
I can do that.
Juergen
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next prev parent reply other threads:[~2022-09-28 16:32 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-08 8:49 [PATCH v3 00/10] x86: make pat and mtrr independent from each other Juergen Gross
2022-09-08 8:49 ` [PATCH v3 01/10] x86/mtrr: add comment for set_mtrr_state() serialization Juergen Gross
2022-09-08 8:49 ` [PATCH v3 02/10] x86/mtrr: remove unused cyrix_set_all() function Juergen Gross
2022-09-08 8:49 ` [PATCH v3 03/10] x86/mtrr: replace use_intel() with a local flag Juergen Gross
2022-09-11 10:16 ` Borislav Petkov
2022-09-12 9:10 ` Juergen Gross
2022-09-19 19:10 ` Borislav Petkov
2022-09-28 10:17 ` Juergen Gross
2022-09-08 8:49 ` [PATCH v3 04/10] x86: move some code out of arch/x86/kernel/cpu/mtrr Juergen Gross
2022-09-11 11:02 ` Borislav Petkov
2022-09-12 9:11 ` Juergen Gross
2022-09-08 8:49 ` [PATCH v3 05/10] x86/mtrr: split generic_set_all() Juergen Gross
2022-09-19 19:25 ` Borislav Petkov
2022-09-08 8:49 ` [PATCH v3 06/10] x86/mtrr: remove set_all callback from struct mtrr_ops Juergen Gross
2022-09-08 8:49 ` [PATCH v3 07/10] x86/mtrr: simplify mtrr_bp_init() Juergen Gross
2022-09-26 18:40 ` Borislav Petkov
2022-09-08 8:49 ` [PATCH v3 08/10] x86/mtrr: let cache_aps_delayed_init replace mtrr_aps_delayed_init Juergen Gross
2022-09-26 21:11 ` Borislav Petkov
2022-09-27 8:57 ` Juergen Gross
2022-09-27 10:10 ` Borislav Petkov
2022-09-27 10:14 ` Juergen Gross
2022-09-27 11:19 ` Borislav Petkov
2022-09-27 11:25 ` Juergen Gross
2022-09-27 12:13 ` Borislav Petkov
2022-09-27 12:21 ` Juergen Gross
2022-09-27 23:16 ` Borislav Petkov
2022-09-28 5:30 ` Juergen Gross
2022-09-28 6:16 ` Juergen Gross
2022-09-28 10:48 ` Borislav Petkov
2022-09-28 11:14 ` Juergen Gross
2022-09-28 11:22 ` Borislav Petkov
2022-09-28 13:43 ` Juergen Gross
2022-09-28 16:12 ` Borislav Petkov
2022-09-28 16:32 ` Juergen Gross [this message]
2022-09-28 16:39 ` Borislav Petkov
2022-09-29 8:26 ` Juergen Gross
2022-09-30 11:55 ` Borislav Petkov
2022-09-30 13:11 ` Juergen Gross
2022-09-30 13:25 ` Borislav Petkov
2022-09-08 8:49 ` [PATCH v3 09/10] x86/mtrr: add a stop_machine() handler calling only cache_cpu_init() Juergen Gross
2022-09-08 8:49 ` [PATCH v3 10/10] x86: decouple pat and mtrr handling Juergen Gross
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