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xen/time: allow Dom0 to set the host time

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Dom0 should be able to set the host time. This is implemented by first
writing to the RTC (as would be done on bare metal), and then using the
XENPF_settime64 hypercall in order to force Xen to update the wallclock
shared page of all domains.

Sponsored by: Citrix Systems R&D
This commit is contained in:
Roger Pau Monné 2016-05-02 16:15:28 +00:00
parent f65466eb3a
commit eac636b0ce
1 changed files with 25 additions and 1 deletions
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26
sys/dev/xen/timer/timer.c
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@ -53,6 +53,7 @@ __FBSDID("$FreeBSD$");
#include <xen/hypervisor.h>
#include <xen/interface/io/xenbus.h>
#include <xen/interface/vcpu.h>
#include <xen/error.h>
#include <machine/cpu.h>
#include <machine/cpufunc.h>
@ -63,6 +64,8 @@ __FBSDID("$FreeBSD$");
#include <dev/xen/timer/timer.h>
#include <isa/rtc.h>
#include "clock_if.h"
static devclass_t xentimer_devclass;
@ -211,11 +214,32 @@ xen_fetch_uptime(struct timespec *ts)
static int
xentimer_settime(device_t dev __unused, struct timespec *ts)
{
struct xen_platform_op settime;
int ret;
/*
* Don't return EINVAL here; just silently fail if the domain isn't
* privileged enough to set the TOD.
*/
return (0);
if (!xen_initial_domain())
return (0);
/* Set the native RTC. */
atrtc_set(ts);
settime.cmd = XENPF_settime64;
settime.u.settime64.mbz = 0;
settime.u.settime64.secs = ts->tv_sec;
settime.u.settime64.nsecs = ts->tv_nsec;
settime.u.settime64.system_time =
xen_fetch_vcpu_time(DPCPU_GET(vcpu_info));
ret = HYPERVISOR_platform_op(&settime);
ret = ret != 0 ? xen_translate_error(ret) : 0;
if (ret != 0 && bootverbose)
device_printf(dev, "failed to set Xen PV clock: %d\n", ret);
return (ret);
}
/**