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hhŒ	_document”hŒsource”NŒline”NubhŒcomment”“”)”}”(hŒ SPDX-License-Identifier: GPL-2.0”h]”hŒ SPDX-License-Identifier: GPL-2.0”…””}”hh£sbah}”(h]”h ]”h"]”h$]”h&]”Œ	xml:space”Œpreserve”uh1h¡hhhžhhŸŒ?/var/lib/git/docbuild/linux/Documentation/virt/paravirt_ops.rst”h KubhŒsection”“”)”}”(hhh]”(hŒtitle”“”)”}”(hŒParavirt_ops”h]”hŒParavirt_ops”…””}”(hh»hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¹hh¶hžhhŸh³h KubhŒ	paragraph”“”)”}”(hXð  Linux provides support for different hypervisor virtualization technologies.
Historically, different binary kernels would be required in order to support
different hypervisors; this restriction was removed with pv_ops.
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hypervisors. It allows each hypervisor to override critical operations and
allows a single kernel binary to run on all supported execution environments
including native machine -- without any hypervisors.”h]”hXð  Linux provides support for different hypervisor virtualization technologies.
Historically, different binary kernels would be required in order to support
different hypervisors; this restriction was removed with pv_ops.
Linux pv_ops is a virtualization API which enables support for different
hypervisors. It allows each hypervisor to override critical operations and
allows a single kernel binary to run on all supported execution environments
including native machine -- without any hypervisors.”…””}”(hhËhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÉhŸh³h Khh¶hžhubhÊ)”}”(hX"  pv_ops provides a set of function pointers which represent operations
corresponding to low-level critical instructions and high-level
functionalities in various areas. pv_ops allows for optimizations at run
time by enabling binary patching of the low-level critical operations
at boot time.”h]”hX"  pv_ops provides a set of function pointers which represent operations
corresponding to low-level critical instructions and high-level
functionalities in various areas. pv_ops allows for optimizations at run
time by enabling binary patching of the low-level critical operations
at boot time.”…””}”(hhÙhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÉhŸh³h Khh¶hžhubhÊ)”}”(hŒ7pv_ops operations are classified into three categories:”h]”hŒ7pv_ops operations are classified into three categories:”…””}”(hhçhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÉhŸh³h Khh¶hžhubhŒbullet_list”“”)”}”(hhh]”(hŒ	list_item”“”)”}”(hŒšsimple indirect call
 These operations correspond to high-level functionality where it is
 known that the overhead of indirect call isn't very important.
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definition”“”)”}”(hhh]”hÊ)”}”(hŒ‚These operations correspond to high-level functionality where it is
known that the overhead of indirect call isn't very important.”h]”hŒ„These operations correspond to high-level functionality where it is
known that the overhead of indirect call isnâ€™t very important.”…””}”(hj   hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÉhŸh³h Khj  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hj  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1j  hŸh³h Khj  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j   hhüubah}”(h]”h ]”h"]”h$]”h&]”uh1húhh÷hžhhŸNh Nubhû)”}”(hŒÞindirect call which allows optimization with binary patch
 Usually these operations correspond to low-level critical instructions. They
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 very important.
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are called frequently and are performance critical. The overhead is
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are called frequently and are performance critical. The overhead is
very important.”…””}”(hjb  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÉhŸh³h Khj_  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hjM  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1j  hŸh³h KhjJ  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j   hjF  ubah}”(h]”h ]”h"]”h$]”h&]”uh1húhh÷hžhhŸNh Nubhû)”}”(hŒÛa set of macros for hand written assembly code
 Hand written assembly codes (.S files) also need paravirtualization
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