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50 lines
1.2 KiB
50 lines
1.2 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Hypervisor Maintenance Interrupt (HMI) handling. |
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* |
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* Copyright 2015 IBM Corporation |
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* Author: Mahesh Salgaonkar <[email protected]> |
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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, or running |
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* on POWER9 or newer CPU. |
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* |
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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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* |
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* POWER9 and newer don't need this synchronisation. |
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* |
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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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