- Add patch from Dirk Brandewie to fix intel pstate divide error (rhbz 916833) - Disable debugging options.
59 lines
1.9 KiB
Diff
59 lines
1.9 KiB
Diff
Hi Josh,
|
|
|
|
Sorry for the slow resopnse you caught me on vacation :-)
|
|
|
|
I do not have either of these VMs ATM to test against. The patch below
|
|
should solve the problem though It looks like the VM is returning zero
|
|
for the highest P state (frequency) MSR. The patch will have the driver refuse
|
|
to load and the system should fall through to one of the other configured
|
|
governors/ scaling drivers.
|
|
|
|
Is it possible for tyou to test the patch below while I try to get a test setup
|
|
put together locally?
|
|
|
|
Thanks in advance
|
|
--Dirk
|
|
|
|
On 03/01/2013 06:13 AM, Josh Boyer wrote:
|
|
> Hi,
|
|
>
|
|
> We've had a report[1] that the intel_pstate driver will panic on boot
|
|
> under certain virtual machine environments. Thus far it seems VMWare
|
|
> and Hyper-V both see this. While this may be because of something those
|
|
> VMs are doing, the driver probably shouldn't cause a panic if it's
|
|
> getting some iffy data.
|
|
>
|
|
commit db138459876467dd1b4785ce2b35c9db31dab056
|
|
Author: Dirk Brandewie <dirk.brandewie@gmail.com>
|
|
Date: Mon Mar 4 10:14:42 2013 -0800
|
|
|
|
cpufreq/intel_pstate: Do not load on VM that do not report max P state.
|
|
|
|
It seems some VMs support the P state MSRs but return zeros. Fail
|
|
gracefully if we are running in this environment.
|
|
|
|
https://bugzilla.redhat.com/show_bug.cgi?id=916833
|
|
|
|
Reported-by: jwboyer@redhat.com
|
|
|
|
Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com>
|
|
---
|
|
drivers/cpufreq/intel_pstate.c | 3 +++
|
|
1 files changed, 3 insertions(+), 0 deletions(-)
|
|
|
|
|
|
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
|
|
index 096fde0..2bfd083 100644
|
|
--- a/drivers/cpufreq/intel_pstate.c
|
|
+++ b/drivers/cpufreq/intel_pstate.c
|
|
@@ -662,6 +662,9 @@ static int intel_pstate_set_policy(struct cpufreq_policy *policy)
|
|
|
|
cpu = all_cpu_data[policy->cpu];
|
|
|
|
+ if (!policy->cpuinfo.max_freq)
|
|
+ return -ENODEV;
|
|
+
|
|
intel_pstate_get_min_max(cpu, &min, &max);
|
|
|
|
limits.min_perf_pct = (policy->min * 100) / policy->cpuinfo.max_freq;
|