diff options
| author | Vivek Thampi <vithampi@vmware.com> | 2020-02-28 05:32:46 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-03-05 17:25:07 -0800 |
| commit | 7d10001e20e46ad6ad95622164686bc2cbfc9802 (patch) | |
| tree | 107641721daeeb7e94e8c5839bbc8566eee6c2c5 /drivers/ptp/Kconfig | |
| parent | a368e860adb14f7496033051c1712dfd214f6cb1 (diff) | |
| download | linux-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/Kconfig | 12 |
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. + endmenu |