Re: [PATCH v1] x86/apic: Fix kernel panic when "intremap=off" and "x2apic_phys" are set
From: Borislav Petkov
Date: Mon Jun 19 2023 - 10:50:38 EST
On Sat, Jun 17, 2023 at 02:52:36AM +0530, Dheeraj Kumar Srivastava wrote:
> x2APIC mode requires "Interrupt Remapping" to be enabled and the
> "physical x2apic" driver can be used only when x2APIC mode is enabled.
> However when "intremap=off" and "x2apic_phys" kernel command line
> parameters are passed, "physical x2apic" driver is being used even when
> x2APIC mode is disabled ("intremap=off" disables x2APIC mode).
> This results in the below kernel panic:
>
> unchecked MSR access error: RDMSR from 0x80f at rIP: 0xffffffff87eab4ec
Not a kernel panic - that's a warning about accessing a non-existent
MSR.
Can you send full dmesg? Privately is fine too.
How exactly do you trigger this? What hw?
Thx.
--
Regards/Gruss,
Boris.
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