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Drivers: hv: restore hypervcall page cleanup before kexec

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We need to cleanup the hypercall page before doing kexec/kdump or the new
kernel may crash if it tries to use it. Reuse the now-empty hv_cleanup
function renaming it to hyperv_cleanup and moving to the arch specific
code.

Fixes: 8730046c14 ("Drivers: hv vmbus: Move Hypercall page setup out of common 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>
This commit is contained in:
Vitaly Kuznetsov
2017-01-28 12:37:14 -07:00
committed by Greg Kroah-Hartman
parent 17244623a4
commit d6f3609d2b
5 changed files with 20 additions and 19 deletions
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16
arch/x86/hyperv/hv_init.c
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@@ -165,6 +165,22 @@ void hyperv_init(void)
clocksource_register_hz(&hyperv_cs_msr, NSEC_PER_SEC/100);
}
/*
* This routine is called before kexec/kdump, it does the required cleanup.
*/
void hyperv_cleanup(void)
{
union hv_x64_msr_hypercall_contents hypercall_msr;
/* Reset our OS id */
wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0);
/* Reset the hypercall page */
hypercall_msr.as_uint64 = 0;
wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
}
EXPORT_SYMBOL_GPL(hyperv_cleanup);
/*
* hv_do_hypercall- Invoke the specified hypercall
*/