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cpufreq/intel_pstate: Add function to check that all MSR's are valid (rhbz 922923)

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This commit is contained in:
Dave Jones 2013-03-19 15:05:22 -04:00
parent 31befe51b6
commit 6f9fa1acc9
2 changed files with 64 additions and 0 deletions
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56
cpufreq-intel-pstate-validate-msrs.patch Normal file
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@ -0,0 +1,56 @@
commit 866111646f2c5d4c6c25e2bb97f5c61c3992defb
Author: Dirk Brandewie <dirk.brandewie@gmail.com>
Date: Mon Mar 18 16:55:02 2013 -0700
cpufreq/intel_pstate: Add function to check that all MSR's are valid
Some VMs seem to try to implement some MSRs but not all the registers
the driver needs. Check to make sure all the MSR that we need are
available. If any of the required MSRs are not available refuse to
load.
Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com>
--- linux-3.9.0-0.rc3.git0.2.fc19.x86_64/drivers/cpufreq/intel_pstate.c~ 2013-03-19 14:54:33.489581718 -0400
+++ linux-3.9.0-0.rc3.git0.2.fc19.x86_64/drivers/cpufreq/intel_pstate.c 2013-03-19 14:55:09.667523730 -0400
@@ -752,6 +752,30 @@ static struct cpufreq_driver intel_pstat
static int __initdata no_load;
+static int intel_pstate_msrs_not_valid(void)
+{
+ /* Check that all the msr's we are using are valid. */
+ u64 aperf, mperf, tmp;
+
+ rdmsrl(MSR_IA32_APERF, aperf);
+ rdmsrl(MSR_IA32_MPERF, mperf);
+
+ if (!intel_pstate_min_pstate() ||
+ !intel_pstate_max_pstate() ||
+ !intel_pstate_turbo_pstate())
+ return -ENODEV;
+
+ rdmsrl(MSR_IA32_APERF, tmp);
+ if (!(tmp - aperf))
+ return -ENODEV;
+
+ rdmsrl(MSR_IA32_MPERF, tmp);
+ if (!(tmp - mperf))
+ return -ENODEV;
+
+ return 0;
+}
+
static int __init intel_pstate_init(void)
{
int cpu, rc = 0;
@@ -764,6 +788,9 @@ static int __init intel_pstate_init(void
if (!id)
return -ENODEV;
+ if (intel_pstate_msrs_not_valid())
+ return -ENODEV;
+
pr_info("Intel P-state driver initializing.\n");
all_cpu_data = vmalloc(sizeof(void *) * num_possible_cpus());

8
kernel.spec
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@ -751,6 +751,8 @@ Patch22000: weird-root-dentry-name-debug.patch
#selinux ptrace child permissions
Patch22001: selinux-apply-different-permission-to-ptrace-child.patch
Patch23000: cpufreq-intel-pstate-validate-msrs.patch
# END OF PATCH DEFINITIONS
%endif
@ -1416,6 +1418,9 @@ ApplyPatch weird-root-dentry-name-debug.patch
#selinux ptrace child permissions
ApplyPatch selinux-apply-different-permission-to-ptrace-child.patch
# rhbz 922923
ApplyPatch cpufreq-intel-pstate-validate-msrs.patch
#rhbz 859485
ApplyPatch vt-Drop-K_OFF-for-VC_MUTE.patch
@ -2285,6 +2290,9 @@ fi
# ||----w |
# || ||
%changelog
* Tue Mar 19 2013 Dave Jones <davej@redhat.com>
- cpufreq/intel_pstate: Add function to check that all MSR's are valid (rhbz 922923)
* Mon Mar 18 2013 Dave Jones <davej@redhat.com> - 3.9.0-0.rc3.git0.4
- s390x config option changes from Dan Horák <dan@danny.cz>
- enable PCI