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authorVitaly Kuznetsov <vkuznets@redhat.com>2017-01-28 12:37:15 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-31 11:05:58 +0100
commit5647dbf8f0807a35421bd0232247b02413ef2cab (patch)
tree0c1b46ca522c505d896bbee02e9c7f7c2ff88e8d /arch/x86/hyperv
parentd6f3609d2b4c6d0eec01f398cb685e50da3e6013 (diff)
downloadlinux-5647dbf8f0807a35421bd0232247b02413ef2cab.tar.bz2
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>
Diffstat (limited to 'arch/x86/hyperv')
-rw-r--r--arch/x86/hyperv/hv_init.c4
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);