From: Peter Zijlstra <peterz@infradead.org>
To: Hans de Goede <hdegoede@redhat.com>
Cc: "Rafael J . Wysocki" <rafael@kernel.org>,
Pavel Machek <pavel@ucw.cz>, Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
"H . Peter Anvin" <hpa@zytor.com>,
x86@kernel.org, linux-kernel@vger.kernel.org,
Dave Hansen <dave.hansen@intel.com>
Subject: Re: [PATCH] x86/cpu: Avoid writing MSR_IA32_TSX_CTRL when writing it is not supported
Date: Tue, 6 Sep 2022 22:43:46 +0200 [thread overview]
Message-ID: <YxexAl+i+6MGjf7K@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20220906201743.436091-1-hdegoede@redhat.com>
On Tue, Sep 06, 2022 at 10:17:43PM +0200, Hans de Goede wrote:
> On an Intel Atom N2600 (and presumable other Cedar Trail models)
> MSR_IA32_TSX_CTRL can be read, causing saved_msr.valid to be set for it
> by msr_build_context().
>
> This causes restore_processor_state() to try and restore it, but writing
> this MSR is not allowed on the Intel Atom N2600 leading to:
FWIW, virt tends to do this same thing a lot. They'll allow reading
random MSRs and only fail on write.
next prev parent reply other threads:[~2022-09-06 20:44 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-06 20:17 [PATCH] x86/cpu: Avoid writing MSR_IA32_TSX_CTRL when writing it is not supported Hans de Goede
2022-09-06 20:43 ` Peter Zijlstra [this message]
2022-09-06 20:56 ` Hans de Goede
2022-09-06 21:00 ` Peter Zijlstra
2022-09-06 23:00 ` Andrew Cooper
2022-09-07 7:32 ` Hans de Goede
2022-09-08 13:34 ` Andrew Cooper
2022-09-08 1:03 ` Pawan Gupta
2022-09-08 13:46 ` Andrew Cooper
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