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>

diff --git a/qemu-options.hx b/qemu-options.hx
index 662f5715277400a38d62b602c908b714918d2c8b..a6cd8e96fd59a71671f045017378434e268e0830 100644 (file)
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -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

diff --git a/vl.c b/vl.c
index 0fccf50a5d191d6054f9e62a07c78b246eba5305..71a4755faf7c6f940773d3124ff2ad3f97a6fe7c 100644 (file)
--- a/vl.c
+++ b/vl.c
@@ -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 {