15ad71460d
Current kvm disables preemption while the new virtualization registers are in use. This of course is not very good for latency sensitive workloads (one use of virtualization is to offload user interface and other latency insensitive stuff to a container, so that it is easier to analyze the remaining workload). This patch re-enables preemption for kvm; preemption is now only disabled when switching the registers in and out, and during the switch to guest mode and back. Contains fixes from Shaohua Li <shaohua.li@intel.com>. Signed-off-by: Avi Kivity <avi@qumranet.com>
51 lines
1.4 KiB
Plaintext
51 lines
1.4 KiB
Plaintext
#
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# KVM configuration
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#
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menuconfig VIRTUALIZATION
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bool "Virtualization"
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depends on X86
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default y
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---help---
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Say Y here to get to see options for using your Linux host to run other
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operating systems inside virtual machines (guests).
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This option alone does not add any kernel code.
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If you say N, all options in this submenu will be skipped and disabled.
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if VIRTUALIZATION
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config KVM
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tristate "Kernel-based Virtual Machine (KVM) support"
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depends on X86 && EXPERIMENTAL
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select PREEMPT_NOTIFIERS
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select ANON_INODES
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---help---
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Support hosting fully virtualized guest machines using hardware
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virtualization extensions. You will need a fairly recent
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processor equipped with virtualization extensions. You will also
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need to select one or more of the processor modules below.
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This module provides access to the hardware capabilities through
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a character device node named /dev/kvm.
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To compile this as a module, choose M here: the module
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will be called kvm.
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If unsure, say N.
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config KVM_INTEL
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tristate "KVM for Intel processors support"
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depends on KVM
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---help---
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Provides support for KVM on Intel processors equipped with the VT
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extensions.
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config KVM_AMD
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tristate "KVM for AMD processors support"
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depends on KVM
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---help---
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Provides support for KVM on AMD processors equipped with the AMD-V
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(SVM) extensions.
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endif # VIRTUALIZATION
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