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rtc: add -rtc clock=rt 

This will let people use backwards-compatible semantics for devices that
will be affected by the following patches.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Paolo Bonzini 2012-03-30 10:31:21 +00:00 committed by Peter Maydell
parent f638f0d3ae
commit 788081417a
2 changed files with 6 additions and 3 deletions
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7
qemu-options.hx
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@ -2453,7 +2453,7 @@ DEF("localtime", 0, QEMU_OPTION_localtime, "", QEMU_ARCH_ALL)
DEF("startdate", HAS_ARG, QEMU_OPTION_startdate, "", QEMU_ARCH_ALL)
DEF("rtc", HAS_ARG, QEMU_OPTION_rtc, \
"-rtc [base=utc|localtime|date][,clock=host|vm][,driftfix=none|slew]\n" \
"-rtc [base=utc|localtime|date][,clock=host|rt|vm][,driftfix=none|slew]\n" \
" set the RTC base and clock, enable drift fix for clock ticks (x86 only)\n",
QEMU_ARCH_ALL)
@ -2469,8 +2469,9 @@ format @code{2006-06-17T16:01:21} or @code{2006-06-17}. The default base is UTC.
By default the RTC is driven by the host system time. This allows to use the
RTC as accurate reference clock inside the guest, specifically if the host
time is smoothly following an accurate external reference clock, e.g. via NTP.
If you want to isolate the guest time from the host, even prevent it from
progressing during suspension, you can set @option{clock} to @code{vm} instead.
If you want to isolate the guest time from the host, you can set @option{clock}
to @code{rt} instead. To even prevent it from progressing during suspension,
you can set it to @code{vm}.
Enable @option{driftfix} (i386 targets only) if you experience time drift problems,
specifically with Windows' ACPI HAL. This option will try to figure out how

2
vl.c
View File

@ -529,6 +529,8 @@ static void configure_rtc(QemuOpts *opts)
if (value) {
if (!strcmp(value, "host")) {
rtc_clock = host_clock;
} else if (!strcmp(value, "rt")) {
rtc_clock = rt_clock;
} else if (!strcmp(value, "vm")) {
rtc_clock = vm_clock;
} else {