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| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2017-01-28 12:37:15 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-01-31 11:05:58 +0100 |
| commit | 5647dbf8f0807a35421bd0232247b02413ef2cab (patch) | |
| tree | 0c1b46ca522c505d896bbee02e9c7f7c2ff88e8d | |
| parent | d6f3609d2b4c6d0eec01f398cb685e50da3e6013 (diff) | |
| download | linux-5647dbf8f0807a35421bd0232247b02413ef2cab.tar.gz linux-5647dbf8f0807a35421bd0232247b02413ef2cab.tar.bz2 linux-5647dbf8f0807a35421bd0232247b02413ef2cab.zip | |
Drivers: hv: restore TSC page cleanup before kexec
We need to cleanup the TSC page before doing kexec/kdump or the new kernel
may crash if it tries to use it.
Fixes: 63ed4e0c67df ("Drivers: hv: vmbus: Consolidate all Hyper-V specific clocksource code")
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/x86/hyperv/hv_init.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index d6b018b86c42..b371d0e984a9 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -178,6 +178,10 @@ void hyperv_cleanup(void) /* Reset the hypercall page */ hypercall_msr.as_uint64 = 0; wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); + + /* Reset the TSC page */ + hypercall_msr.as_uint64 = 0; + wrmsrl(HV_X64_MSR_REFERENCE_TSC, hypercall_msr.as_uint64); } EXPORT_SYMBOL_GPL(hyperv_cleanup); |