blob: a88699e818b74c9d68c5fce6b46ef6cfda335d57 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
/******************************************************************************
* arch/x86/guest/hyperv/util.c
*
* Hyper-V utility functions
*
* Copyright (c) 2020 Microsoft.
*/
#include <xen/cpu.h>
#include <xen/cpumask.h>
#include <xen/errno.h>
#include <asm/guest/hyperv.h>
#include <asm/guest/hyperv-tlfs.h>
#include "private.h"
int cpumask_to_vpset(struct hv_vpset *vpset,
const cpumask_t *mask)
{
int nr = 1;
unsigned int cpu, vcpu_bank, vcpu_offset;
unsigned int max_banks = hv_max_vp_index / 64;
/* Up to 64 banks can be represented by valid_bank_mask */
if ( max_banks > 64 )
return -E2BIG;
/* Clear all banks to avoid flushing unwanted CPUs */
for ( vcpu_bank = 0; vcpu_bank < max_banks; vcpu_bank++ )
vpset->bank_contents[vcpu_bank] = 0;
vpset->format = HV_GENERIC_SET_SPARSE_4K;
for_each_cpu ( cpu, mask )
{
unsigned int vcpu = hv_vp_index(cpu);
vcpu_bank = vcpu / 64;
vcpu_offset = vcpu % 64;
__set_bit(vcpu_offset, &vpset->bank_contents[vcpu_bank]);
if ( vcpu_bank >= nr )
nr = vcpu_bank + 1;
}
/* Some banks may be empty but that's ok */
vpset->valid_bank_mask = ~0ULL >> (64 - nr);
return nr;
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
|
