Re: [Xen-devel] xen-acpi-processor: (CX): Hypervisor error (-38) for ACPI CPU

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

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@xxxxxxxxxxxxxxxxxxxxxxxxx) (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@xxxxxxxxxx>
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@xxxxxxxxxxx>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
 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. */
-- 
1.8.5.3

>      -Don Slutz
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxx
> http://lists.xen.org/xen-devel

Attachment: 0001-xen-acpi-processor-Don-t-display-errors-when-we-get-.patch
Description: Text document

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