From: Borislav Petkov <bp@alien8.de>
To: Reinette Chatre <reinette.chatre@intel.com>
Cc: Ben Horgan <ben.horgan@arm.com>,
x86@kernel.org, james.morse@arm.com, fenghuay@nvidia.com,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, tglx@linutronix.de,
mingo@redhat.com, dave.hansen@linux.intel.com, hpa@zytor.com,
corbet@lwn.net, linux-doc@vger.kernel.org, dave.martin@arm.com
Subject: Re: [PATCH v5 0/3] x86,fs/resctrl,arm_mpam: Factor MBA parse-time conversion to be per-arch
Date: Fri, 4 Sep 2026 17:45:05 -0700 [thread overview]
Message-ID: <20260905004505.GAaptmEVxltONVfl2J@fat_crate.local> (raw)
In-Reply-To: <35ebb8d4-2ef0-4bc0-ac3f-afff0c95ae89@intel.com>
On Fri, Sep 04, 2026 at 02:15:08PM -0700, Reinette Chatre wrote:
> Sashiko's second comment is about resctrl's existing (not introduced by this patch)
> Intel specific enumeration being resilient against a hypervisor misconfiguration.
> Thus far resctrl assumed the enumeration would return what the actual hardware
> is known to support.
>
> Sashiko had similar "hypervisor misconfiguration" comments in response to another
> resctrl series that already falls under the "cleanup" umbrella. It is not clear to
> me how far resctrl needs to go to be resilient against hypervisor misconfiguration
> but I can include needed validation addressing this report as part of [1].
I would always ask myself how realistic is the use case. Here, I'm thinking
not that realistic unless you guys wanna support resctrl in a guest. Which
would be weird, IMHO, because a guest can fake all kinds of hw so controlling
resources of a fake hw is an exercise in futility.
So might as well answer that Sashiko review comment with "thanks, but no
thanks."
:-)
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
next prev parent reply other threads:[~2026-09-05 0:45 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-09 9:31 [PATCH v5 0/3] x86,fs/resctrl,arm_mpam: Factor MBA parse-time conversion to be per-arch Ben Horgan
2026-07-09 9:31 ` [PATCH v5 1/3] x86,fs/resctrl: Add resctrl_arch_preconvert_bw() Ben Horgan
2026-07-09 9:31 ` [PATCH v5 2/3] arm_mpam: resctrl: Add pass-through resctrl_arch_preconvert_bw() Ben Horgan
2026-07-09 9:31 ` [PATCH v5 3/3] fs/resctrl: Factor MBA parse-time conversion to be per-arch Ben Horgan
2026-07-14 17:45 ` [PATCH v5 0/3] x86,fs/resctrl,arm_mpam: " Reinette Chatre
2026-07-14 22:48 ` Moger, Babu
2026-07-14 23:59 ` Reinette Chatre
2026-09-03 15:40 ` Reinette Chatre
2026-09-04 3:37 ` Borislav Petkov
2026-09-04 17:36 ` Borislav Petkov
2026-09-04 21:15 ` Reinette Chatre
2026-09-05 0:45 ` Borislav Petkov [this message]
2026-09-07 10:44 ` Ben Horgan
2026-09-08 15:35 ` Reinette Chatre
2026-09-08 15:44 ` Ben Horgan
2026-07-15 0:13 ` Gavin Shan
2026-07-15 16:02 ` Reinette Chatre
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