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Diffstat (limited to 'Documentation/virtual/paravirt_ops.txt')
| -rw-r--r-- | Documentation/virtual/paravirt_ops.txt | 32 |
1 files changed, 0 insertions, 32 deletions
diff --git a/Documentation/virtual/paravirt_ops.txt b/Documentation/virtual/paravirt_ops.txt deleted file mode 100644 index d4881c00e339..000000000000 --- a/Documentation/virtual/paravirt_ops.txt +++ /dev/null @@ -1,32 +0,0 @@ -Paravirt_ops -============ - -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. - -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-ops critical operations -at boot time. - -pv_ops operations are classified into three categories: - -- simple indirect call - These operations correspond to high level functionality where it is - known that the overhead of indirect call isn't very important. - -- indirect call which allows optimization with binary patch - Usually these operations correspond to low level critical instructions. They - are called frequently and are performance critical. The overhead is - very important. - -- a set of macros for hand written assembly code - Hand written assembly codes (.S files) also need paravirtualization - because they include sensitive instructions or some of code paths in - them are very performance critical. |