46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-or-later
|
||
|
|
/*
|
||
|
|
* Hypervisor Maintenance Interrupt (HMI) handling.
|
||
|
|
*
|
||
|
|
* Copyright 2015 IBM Corporation
|
||
|
|
* Author: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#undef DEBUG
|
||
|
|
|
||
|
|
#include <linux/types.h>
|
||
|
|
#include <linux/compiler.h>
|
||
|
|
#include <asm/paca.h>
|
||
|
|
#include <asm/hmi.h>
|
||
|
|
#include <asm/processor.h>
|
||
|
|
|
||
|
|
void wait_for_subcore_guest_exit(void)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* NULL bitmap pointer indicates that KVM module hasn't
|
||
|
|
* been loaded yet and hence no guests are running.
|
||
|
|
* If no KVM is in use, no need to co-ordinate among threads
|
||
|
|
* as all of them will always be in host and no one is going
|
||
|
|
* to modify TB other than the opal hmi handler.
|
||
|
|
* Hence, just return from here.
|
||
|
|
*/
|
||
|
|
if (!local_paca->sibling_subcore_state)
|
||
|
|
return;
|
||
|
|
|
||
|
|
for (i = 0; i < MAX_SUBCORE_PER_CORE; i++)
|
||
|
|
while (local_paca->sibling_subcore_state->in_guest[i])
|
||
|
|
cpu_relax();
|
||
|
|
}
|
||
|
|
|
||
|
|
void wait_for_tb_resync(void)
|
||
|
|
{
|
||
|
|
if (!local_paca->sibling_subcore_state)
|
||
|
|
return;
|
||
|
|
|
||
|
|
while (test_bit(CORE_TB_RESYNC_REQ_BIT,
|
||
|
|
&local_paca->sibling_subcore_state->flags))
|
||
|
|
cpu_relax();
|
||
|
|
}
|