58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
/*
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* Hypervisor Maintenance Interrupt (HMI) handling.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program.
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*
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* Copyright 2015 IBM Corporation
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* Author: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
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*/
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#undef DEBUG
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#include <linux/types.h>
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#include <linux/compiler.h>
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#include <asm/paca.h>
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#include <asm/hmi.h>
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#include <asm/processor.h>
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void wait_for_subcore_guest_exit(void)
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{
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int i;
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/*
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* NULL bitmap pointer indicates that KVM module hasn't
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* been loaded yet and hence no guests are running.
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* If no KVM is in use, no need to co-ordinate among threads
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* as all of them will always be in host and no one is going
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* to modify TB other than the opal hmi handler.
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* Hence, just return from here.
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*/
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if (!local_paca->sibling_subcore_state)
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return;
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for (i = 0; i < MAX_SUBCORE_PER_CORE; i++)
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while (local_paca->sibling_subcore_state->in_guest[i])
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cpu_relax();
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}
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void wait_for_tb_resync(void)
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{
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if (!local_paca->sibling_subcore_state)
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return;
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while (test_bit(CORE_TB_RESYNC_REQ_BIT,
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&local_paca->sibling_subcore_state->flags))
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cpu_relax();
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}
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