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| author | Glauber de Oliveira Costa <gcosta@redhat.com> | 2008-02-15 17:52:48 -0200 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2008-04-27 11:53:22 +0300 |
| commit | 790c73f6289a204f858ffdcbe4a2b38e91657ec6 (patch) | |
| tree | 3d6b146538b11e45a713bb4fa1b44af4509ca27f /arch/x86/Kconfig | |
| parent | 18068523d3a0b41fcee5b53cdb437a0ab4d65e4b (diff) | |
| download | lwn-790c73f6289a204f858ffdcbe4a2b38e91657ec6.tar.gz lwn-790c73f6289a204f858ffdcbe4a2b38e91657ec6.zip | |
x86: KVM guest: paravirtualized clocksource
This is the guest part of kvm clock implementation
It does not do tsc-only timing, as tsc can have deltas
between cpus, and it did not seem worthy to me to keep
adjusting them.
We do use it, however, for fine-grained adjustment.
Other than that, time comes from the host.
[randy dunlap: add missing include]
[randy dunlap: disallow on Voyager or Visual WS]
Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'arch/x86/Kconfig')
| -rw-r--r-- | arch/x86/Kconfig | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 2fadf794483d..40cedc255eda 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -373,6 +373,17 @@ config VMI at the moment), by linking the kernel to a GPL-ed ROM module provided by the hypervisor. +config KVM_CLOCK + bool "KVM paravirtualized clock" + select PARAVIRT + depends on !(X86_VISWS || X86_VOYAGER) + help + Turning on this option will allow you to run a paravirtualized clock + when running over the KVM hypervisor. Instead of relying on a PIT + (or probably other) emulation by the underlying device model, the host + provides the guest with timing infrastructure such as time of day, and + system time + source "arch/x86/lguest/Kconfig" config PARAVIRT |