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authorVivek Thampi <vithampi@vmware.com>2020-02-28 05:32:46 +0000
committerDavid S. Miller <davem@davemloft.net>2020-03-05 17:25:07 -0800
commit7d10001e20e46ad6ad95622164686bc2cbfc9802 (patch)
tree107641721daeeb7e94e8c5839bbc8566eee6c2c5 /drivers/ptp/Kconfig
parenta368e860adb14f7496033051c1712dfd214f6cb1 (diff)
downloadlinux-7d10001e20e46ad6ad95622164686bc2cbfc9802.tar.bz2
ptp: add VMware virtual PTP clock driver
Add a PTP clock driver called ptp_vmw, for guests running on VMware ESXi hypervisor. The driver attaches to a VMware virtual device called "precision clock" that provides a mechanism for querying host system time. Similar to existing virtual PTP clock drivers (e.g. ptp_kvm), ptp_vmw utilizes the kernel's PTP hardware clock API to implement a clock device that can be used as a reference in Chrony for synchronizing guest time with host. The driver is only applicable to x86 guests running in VMware virtual machines with precision clock virtual device present. It uses a VMware specific hypercall mechanism to read time from the device. Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com> Signed-off-by: Vivek Thampi <vithampi@vmware.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/ptp/Kconfig')
-rw-r--r--drivers/ptp/Kconfig12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/ptp/Kconfig b/drivers/ptp/Kconfig
index 3b424ffceb83..86400c708150 100644
--- a/drivers/ptp/Kconfig
+++ b/drivers/ptp/Kconfig
@@ -139,4 +139,16 @@ config PTP_1588_CLOCK_IDTCM
To compile this driver as a module, choose M here: the module
will be called ptp_clockmatrix.
+config PTP_1588_CLOCK_VMW
+ tristate "VMware virtual PTP clock"
+ depends on ACPI && HYPERVISOR_GUEST && X86
+ depends on PTP_1588_CLOCK
+ help
+ This driver adds support for using VMware virtual precision
+ clock device as a PTP clock. This is only useful in virtual
+ machines running on VMware virtual infrastructure.
+
+ To compile this driver as a module, choose M here: the module
+ will be called ptp_vmw.
+
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