1 .. SPDX-License-Identifier: GPL-2.0
2
3 ============
4 Paravirt_ops
5 ============
6
7 Linux provides support for different hyperviso
8 Historically, different binary kernels would b
9 different hypervisors; this restriction was re
10 Linux pv_ops is a virtualization API which ena
11 hypervisors. It allows each hypervisor to over
12 allows a single kernel binary to run on all su
13 including native machine -- without any hyperv
14
15 pv_ops provides a set of function pointers whi
16 corresponding to low-level critical instructio
17 functionalities in various areas. pv_ops allow
18 time by enabling binary patching of the low-le
19 at boot time.
20
21 pv_ops operations are classified into three ca
22
23 - simple indirect call
24 These operations correspond to high-level f
25 known that the overhead of indirect call is
26
27 - indirect call which allows optimization with
28 Usually these operations correspond to low-
29 are called frequently and are performance c
30 very important.
31
32 - a set of macros for hand written assembly co
33 Hand written assembly codes (.S files) also
34 because they include sensitive instructions
35 them are very performance critical.
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