28f52cc04d
[Jan: fix build with CONFIG_USER_ONLY] Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
65 lines
1.2 KiB
C
65 lines
1.2 KiB
C
/*
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* QEMU Hyper-V support
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*
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* Copyright Red Hat, Inc. 2011
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*
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* Author: Vadim Rozenfeld <vrozenfe@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "hyperv.h"
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static bool hyperv_vapic;
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static bool hyperv_relaxed_timing;
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static int hyperv_spinlock_attempts = HYPERV_SPINLOCK_NEVER_RETRY;
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void hyperv_enable_vapic_recommended(bool val)
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{
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hyperv_vapic = val;
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}
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void hyperv_enable_relaxed_timing(bool val)
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{
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hyperv_relaxed_timing = val;
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}
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void hyperv_set_spinlock_retries(int val)
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{
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hyperv_spinlock_attempts = val;
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if (hyperv_spinlock_attempts < 0xFFF) {
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hyperv_spinlock_attempts = 0xFFF;
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}
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}
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bool hyperv_enabled(void)
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{
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return hyperv_hypercall_available() || hyperv_relaxed_timing_enabled();
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}
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bool hyperv_hypercall_available(void)
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{
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if (hyperv_vapic ||
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(hyperv_spinlock_attempts != HYPERV_SPINLOCK_NEVER_RETRY)) {
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return true;
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}
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return false;
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}
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bool hyperv_vapic_recommended(void)
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{
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return hyperv_vapic;
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}
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bool hyperv_relaxed_timing_enabled(void)
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{
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return hyperv_relaxed_timing;
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}
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int hyperv_get_spinlock_retries(void)
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{
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return hyperv_spinlock_attempts;
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}
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