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Annotation of qemu/target-i386/hyperv.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * QEMU Hyper-V support
                      3:  *
                      4:  * Copyright Red Hat, Inc. 2011
                      5:  *
                      6:  * Author: Vadim Rozenfeld     <[email protected]>
                      7:  *
                      8:  * This work is licensed under the terms of the GNU GPL, version 2 or later.
                      9:  * See the COPYING file in the top-level directory.
                     10:  *
                     11:  */
                     12: 
                     13: #include "hyperv.h"
                     14: 
                     15: static bool hyperv_vapic;
                     16: static bool hyperv_relaxed_timing;
                     17: static int hyperv_spinlock_attempts = HYPERV_SPINLOCK_NEVER_RETRY;
                     18: 
                     19: void hyperv_enable_vapic_recommended(bool val)
                     20: {
                     21:     hyperv_vapic = val;
                     22: }
                     23: 
                     24: void hyperv_enable_relaxed_timing(bool val)
                     25: {
                     26:     hyperv_relaxed_timing = val;
                     27: }
                     28: 
                     29: void hyperv_set_spinlock_retries(int val)
                     30: {
                     31:     hyperv_spinlock_attempts = val;
                     32:     if (hyperv_spinlock_attempts < 0xFFF) {
                     33:         hyperv_spinlock_attempts = 0xFFF;
                     34:     }
                     35: }
                     36: 
                     37: bool hyperv_enabled(void)
                     38: {
                     39:     return hyperv_hypercall_available() || hyperv_relaxed_timing_enabled();
                     40: }
                     41: 
                     42: bool hyperv_hypercall_available(void)
                     43: {
                     44:     if (hyperv_vapic ||
                     45:         (hyperv_spinlock_attempts != HYPERV_SPINLOCK_NEVER_RETRY)) {
                     46:       return true;
                     47:     }
                     48:     return false;
                     49: }
                     50: 
                     51: bool hyperv_vapic_recommended(void)
                     52: {
                     53:     return hyperv_vapic;
                     54: }
                     55: 
                     56: bool hyperv_relaxed_timing_enabled(void)
                     57: {
                     58:     return hyperv_relaxed_timing;
                     59: }
                     60: 
                     61: int hyperv_get_spinlock_retries(void)
                     62: {
                     63:     return hyperv_spinlock_attempts;
                     64: }

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