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Re: [PATCH for-4.22 v2 8/8] x86/mwait-idle: Add C-states validation
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 15 May 2026 09:01:08 +0200
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Delivery-date: Fri, 15 May 2026 07:02:17 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 14.05.2026 17:30, Roger Pau Monné wrote:
> On Tue, May 12, 2026 at 05:38:32PM +0200, Jan Beulich wrote:
>> From: Artem Bityutskiy <artem.bityutskiy@xxxxxxxxxxxxxxx>
>>
>> Add validation for C-states specified via the "table=" module parameter.
>> Treat this module parameter as untrusted input and validate it thoroughly.
>>
>> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@xxxxxxxxxxxxxxx>
>> Link: https://patch.msgid.link/20251216080402.156988-4-dedekind1@xxxxxxxxx
>> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
>> Origin: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>> be6a150829b3
>>
>> Add __init to validate_cmdline_cstate(). Other adjustments to fit our env.
>>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>
> Acked-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Thanks.
>> @@ -1697,6 +1737,21 @@ static void __init cmdline_table_adjust(
>> state->name, state->exit_latency,
>> state->target_residency);
>> }
>>
>> + /* Validate the adjusted C-states */
>> + for (i = 0; i < state_count; i++) {
>> + struct cpuidle_state *prev_state;
>
> const?
Oh, yes, I should have done that with the other v2 change.
> FWIW, you could also init the field at definition, but I
> understand this might diverge too much from the Linux code.
Right, hence why I left it. Generally I agree that using initializers is
preferable over separate assignments.
Jan
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