Re: xen-acpi-processor: (CX): Hypervisor error (-38) for ACPI CPU

[Andrew Cooper <andrew.cooper3@citrix.com>]

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On 19/03/14 20:04, Konrad Rzeszutek Wilk wrote:
> On Wed, Mar 19, 2014 at 03:44:13PM -0400, Don Slutz wrote:
>> I just noticed these messages from a 4.5-unstable build (a03984e + xenctx changes):
>>
>> (XEN) Xen version 4.5-unstable (don@culpepper.cloudswitch.com) (gcc (GCC) 4.7.2 20120921 (Red Hat 4.7.2-2)) debug=y Tue Mar 18 14:00:04 EDT 2014
>> (XEN) Latest ChangeSet: Thu Dec 12 19:17:03 2013 +0000 git:a03984e
>> ...
>> Mar 19 15:31:16 dcs-xen-54 kernel: [   92.479270] xen-acpi-processor: (CX): Hypervisor error (-38) for ACPI CPU1
>> Mar 19 15:31:16 dcs-xen-54 kernel: [   92.479328] xen-acpi-processor: (CX): Hypervisor error (-38) for ACPI CPU2
>> Mar 19 15:31:16 dcs-xen-54 kernel: [   92.479346] xen-acpi-processor: (CX): Hypervisor error (-38) for ACPI CPU3
>> Mar 19 15:31:16 dcs-xen-54 kernel: [   92.479366] xen-acpi-processor: (CX): Hypervisor error (-38) for ACPI CPU4
>> Mar 19 15:31:16 dcs-xen-54 kernel: [   92.479381] xen-acpi-processor: (CX): Hypervisor error (-38) for ACPI CPU5
>> Mar 19 15:31:16 dcs-xen-54 kernel: [   92.479398] xen-acpi-processor: (CX): Hypervisor error (-38) for ACPI CPU6
>> Mar 19 15:31:16 dcs-xen-54 kernel: [   92.479411] xen-acpi-processor: (CX): Hypervisor error (-38) for ACPI CPU7
>> Mar 19 15:31:16 dcs-xen-54 kernel: [   92.479427] xen-acpi-processor: (CX): Hypervisor error (-38) for ACPI CPU8
>>
>>
>> This related to no-cpuidle that I have specified.  Is this a bug or is it expected?
> Does this fix it for you (inline and attached)?
>
> From 3b2c8fd5e3a8722983f93e790d609d0d5b38054b Mon Sep 17 00:00:00 2001
> From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> Date: Wed, 19 Mar 2014 16:03:23 -0400
> Subject: [PATCH] xen-acpi-processor: Don't display errors when we get -ENOSYS
>
> which is a perfectly legal error. This can be triggered if the
> user has booted Xen with the no-cpuidle parameter.
>
> Reported-by: Don Slutz <dslutz@verizon.com>
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

An ENOSYS should imply that dom0 shouldn't try setting any further CPUs
worth of information.

~Andrew

> ---
>  drivers/xen/xen-acpi-processor.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/xen/xen-acpi-processor.c b/drivers/xen/xen-acpi-processor.c
> index 82358d1..59fc190 100644
> --- a/drivers/xen/xen-acpi-processor.c
> +++ b/drivers/xen/xen-acpi-processor.c
> @@ -127,7 +127,7 @@ static int push_cxx_to_hypervisor(struct acpi_processor *_pr)
>  			pr_debug("     C%d: %s %d uS\n",
>  				 cx->type, cx->desc, (u32)cx->latency);
>  		}
> -	} else if (ret != -EINVAL)
> +	} else if ((ret != -EINVAL) && (ret != -ENOSYS))
>  		/* EINVAL means the ACPI ID is incorrect - meaning the ACPI
>  		 * table is referencing a non-existing CPU - which can happen
>  		 * with broken ACPI tables. */
> @@ -259,7 +259,7 @@ static int push_pxx_to_hypervisor(struct acpi_processor *_pr)
>  			(u32) perf->states[i].power,
>  			(u32) perf->states[i].transition_latency);
>  		}
> -	} else if (ret != -EINVAL)
> +	} else if ((ret != -EINVAL) && (ret != -ENOSYS))
>  		/* EINVAL means the ACPI ID is incorrect - meaning the ACPI
>  		 * table is referencing a non-existing CPU - which can happen
>  		 * with broken ACPI tables. */
>
>
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