Re: [RFC PATCH 06/16] x86/split_lock: Save #AC setting for split lock in firmware in boot time and restore the setting in reboot

From: Peter Zijlstra
Date: Thu Jun 21 2018 - 15:58:36 EST

Next message: Luck, Tony: "Re: [PATCH] x86/mce: Do not overwrite MCi_STATUS in mce_no_way_out()"
Previous message: Peter Zijlstra: "Re: [RFC PATCH 04/16] x86/split_lock: Use non locked bit set instruction in set_cpu_cap"
Next in thread: Alan Cox: "Re: [RFC PATCH 06/16] x86/split_lock: Save #AC setting for split lock in firmware in boot time and restore the setting in reboot"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

On Sun, May 27, 2018 at 08:45:55AM -0700, Fenghua Yu wrote:
> Firmware may contain split locked instructions.

I think that's the wrong attitude. You should mandate in your BIOS
development guide that Firmware _MUST_NOT_ contain unaligned LOCK
prefixed instructions.

Next message: Luck, Tony: "Re: [PATCH] x86/mce: Do not overwrite MCi_STATUS in mce_no_way_out()"
Previous message: Peter Zijlstra: "Re: [RFC PATCH 04/16] x86/split_lock: Use non locked bit set instruction in set_cpu_cap"
Next in thread: Alan Cox: "Re: [RFC PATCH 06/16] x86/split_lock: Save #AC setting for split lock in firmware in boot time and restore the setting in reboot"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]