linux-kernel - Re: [6.5.0-rc1] unchecked MSR access error: RDMSR from 0xe2 at rIP: 0xffffffff87090227 (native_read_msr+0x7/0x40) (intel_idle_init_cstates

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Message-ID: <20230714211021.GB3275140@hirez.programming.kicks-ass.net>
Date:   Fri, 14 Jul 2023 23:10:21 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Wysocki, Rafael J" <rafael.j.wysocki@...el.com>
Cc:     Bruno Goncalves <bgoncalv@...hat.com>, arjan@...ux.intel.com,
        x86@...nel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [6.5.0-rc1] unchecked MSR access error: RDMSR from 0xe2 at rIP:
 0xffffffff87090227 (native_read_msr+0x7/0x40) (intel_idle_init_cstates_icpu)

On Tue, Jul 11, 2023 at 08:37:51PM +0200, Wysocki, Rafael J wrote:

> > Rafael, can we please just pull these patches and try again later?
> 
> I think you mean "revert"?

Yes, revert. The whole premise with the unparsable changelog that
babbles about TLB invalidates without any performance data-so-ever
should've been a red-flag.

That whole TLB angle is nonsense. We have paravirt TLB invalidation for
this.