linux-kernel - Re: [PATCH v3 09/47] arm64: mpam: Add cpu

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Message-ID: <a0d81df0-901a-4478-a07d-e9ee61d21300@redhat.com>
Date: Mon, 19 Jan 2026 14:40:59 +0800
From: Gavin Shan <gshan@...hat.com>
To: Ben Horgan <ben.horgan@....com>
Cc: amitsinght@...vell.com, baisheng.gao@...soc.com,
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 dave.martin@....com, david@...nel.org, dfustini@...libre.com,
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Subject: Re: [PATCH v3 09/47] arm64: mpam: Add cpu_pm notifier to restore MPAM
 sysregs

On 1/13/26 12:58 AM, Ben Horgan wrote:
> From: James Morse <james.morse@....com>
> 
> The MPAM system registers will be lost if the CPU is reset during PSCI's
> CPU_SUSPEND.
> 
> Add a PM notifier to restore them.
> 
> mpam_thread_switch(current) can't be used as this won't make any changes if
> the in-memory copy says the register already has the correct value. In
> reality the system register is UNKNOWN out of reset.
> 
> Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>
> Signed-off-by: James Morse <james.morse@....com>
> Signed-off-by: Ben Horgan <ben.horgan@....com>
> ---
>   arch/arm64/kernel/mpam.c | 30 ++++++++++++++++++++++++++++++
>   1 file changed, 30 insertions(+)
> 

Reviewed-by: Gavin Shan <gshan@...hat.com>