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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
View File

@ -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
*/

1
arch/x86/include/asm/mshyperv.h
View File

@ -171,5 +171,6 @@ void hv_remove_crash_handler(void);
void hyperv_init(void);
void hyperv_report_panic(struct pt_regs *regs);
bool hv_is_hypercall_page_setup(void);
void hyperv_cleanup(void);
#endif
#endif

10
drivers/hv/hv.c
View File

@ -70,16 +70,6 @@ int hv_init(void)
return 0;
}
/*
* hv_cleanup - Cleanup routine.
*
* This routine is called normally during driver unloading or exiting.
*/
void hv_cleanup(bool crash)
{
}
/*
* hv_post_message - Post a message using the hypervisor message IPC.
*

2
drivers/hv/hyperv_vmbus.h
View File

@ -255,8 +255,6 @@ struct hv_ring_buffer_debug_info {
extern int hv_init(void);
extern void hv_cleanup(bool crash);
extern int hv_post_message(union hv_connection_id connection_id,
enum hv_message_type message_type,
void *payload, size_t payload_size);

10
drivers/hv/vmbus_drv.c
View File

@ -962,7 +962,7 @@ static int vmbus_bus_init(void)
ret = bus_register(&hv_bus);
if (ret)
goto err_cleanup;
return ret;
hv_setup_vmbus_irq(vmbus_isr);
@ -1004,9 +1004,6 @@ static int vmbus_bus_init(void)
bus_unregister(&hv_bus);
err_cleanup:
hv_cleanup(false);
return ret;
}
@ -1462,7 +1459,7 @@ static void hv_kexec_handler(void)
/* Make sure conn_state is set as hv_synic_cleanup checks for it */
mb();
cpuhp_remove_state(hyperv_cpuhp_online);
hv_cleanup(false);
hyperv_cleanup();
};
static void hv_crash_handler(struct pt_regs *regs)
@ -1475,7 +1472,7 @@ static void hv_crash_handler(struct pt_regs *regs)
*/
vmbus_connection.conn_state = DISCONNECTED;
hv_synic_cleanup(smp_processor_id());
hv_cleanup(true);
hyperv_cleanup();
};
static int __init hv_acpi_init(void)
@ -1535,7 +1532,6 @@ static void __exit vmbus_exit(void)
&hyperv_panic_block);
}
bus_unregister(&hv_bus);
hv_cleanup(false);
for_each_online_cpu(cpu) {
tasklet_kill(hv_context.event_dpc[cpu]);
}