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Message-ID: <CALjTZvYFTS4G4CZnFqHU+H7v4_0w-hFB_wV6Z1Ksy+nQ6M6_5A@mail.gmail.com>
Date: Fri, 7 Apr 2023 19:57:59 +0100
From: Rui Salvaterra <rsalvaterra@...il.com>
To: srinivas pandruvada <srinivas.pandruvada@...ux.intel.com>
Cc: Borislav Petkov <bp@...en8.de>, x86@...nel.org,
linux-kernel@...r.kernel.org,
"Rafael J. Wysocki" <rafael@...nel.org>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Amit Kucheria <amitk@...nel.org>,
Zhang Rui <rui.zhang@...el.com>, linux-pm@...r.kernel.org
Subject: Re: [BUG?] unchecked MSR access error: WRMSR to 0x19c
Hi, Srinivas,
On Thu, 6 Apr 2023 at 23:31, srinivas pandruvada
<srinivas.pandruvada@...ux.intel.com> wrote:
>
> Please send output of : cpuid -1
Attached.
> Also please try this:
>
> #wrmsr 0x19c 0xaaa8
> This should give "wrmsr: CPU 0 cannot set MSR 0x0000019c to 0x000000000000aaa8
Indeed, it does:
wrmsr: CPU 0 cannot set MSR 0x0000019c to 0x000000000000aaa8
> #wrmsr 0x19c 0x0aa8
>
> I think this will not return error.
Correct, no error writing 0x0aa8.
I'll soon test the patch you sent me.
Kind regards,
Rui
View attachment "cpuid.txt" of type "text/plain" (27032 bytes)
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