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SubjectRe: [PATCH 09/15] x86/split_lock: Explicitly enable or disable #AC for split locked accesses
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On 05/14/2018 11:52 AM, Fenghua Yu wrote:
> By default, we don't set or clear the bit 29 in TEST_CTL MSR 0x33 and
> the bit is inherited from BIOS/hardware setting.
>
> The kernel parameter "split_lock_ac=on/off" explicitly sets or clears
> the bit during boot time.

The more I think about this... Why do we need this at boot anyway?
Surely boot-time kernel code can't cause performance issues in the same
way that untrusted repeated userspace can. Why don't we just let
userspace turn this on?

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