[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] [PATCH] fix the time issue on x86_64
> For x86_64, we must have a RTC driver compiled in kernel. > I compiled a native x86_64 Linux kernel without any RTC > driver support, and the native Linux kernel also has the same > time issue. > If we run hwclock, we get > Cannot access the Hardware Clock via any known method. > Use the --debug option to see the details of our search > for an access method. > If this command fails, /etc/rc.d/rc.sysinit can not set > kernel time (by calling syscall settimeofday()) correctly. > > And after adding CONFIG_RTC to xeno64 default config file, > the time issue is gone. > But for i386, this is not a must, for it has some other way > to get the RTC time. This will only work for privileged guests -- unprivileged guests can not and should not be able to access the RTC directly. The options are to either have our own /dev/rtc driver, or to emulate reading the rtc in Xen for unprivilged guests (which is dead easy). Ian > Following is the patch: > > # This is a BitKeeper generated diff -Nru style patch. > # > # ChangeSet > # 2005/06/08 23:59:01-07:00 xin@xxxxxxxxxxxxxxxxxxxxxx > # fix time issue bug on x86_64 > # Signed-off-by: Li B Xin <li.b.xin@xxxxxxxxx> > # Signed-off-by: Jun Nakajima <jun.nakajima@xxxxxxxxx> > # > # linux-2.6.11-xen-sparse/arch/xen/configs/xen0_defconfig_x86_64 > # 2005/06/08 23:59:00-07:00 xin@xxxxxxxxxxxxxxxxxxxxxx +1 -1 > # fix time issue bug by adding RTC driver support. > # x86_64 must have a RTC driver support, or we can not run hwclock > successfully, so we can not set a correct time to kernel. > # Signed-off-by: Li B Xin <li.b.xin@xxxxxxxxx> > # Signed-off-by: Jun Nakajima <jun.nakajima@xxxxxxxxx> > # > diff -Nru > a/linux-2.6.11-xen-sparse/arch/xen/configs/xen0_defconfig_x86_64 > b/linux-2.6.11-xen-sparse/arch/xen/configs/xen0_defconfig_x86_64 > --- a/linux-2.6.11-xen-sparse/arch/xen/configs/xen0_defconfig_x86_64 > 2005-06-09 00:02:32 -07:00 > +++ b/linux-2.6.11-xen-sparse/arch/xen/configs/xen0_defconfig_x86_64 > 2005-06-09 00:02:32 -07:00 > @@ -701,7 +701,7 @@ > # CONFIG_WATCHDOG is not set > # CONFIG_HW_RANDOM is not set > # CONFIG_NVRAM is not set > -# CONFIG_RTC is not set > +CONFIG_RTC=y > # CONFIG_GEN_RTC is not set > # CONFIG_DTLK is not set > # CONFIG_R3964 is not set > > > thanks > -Xin > > _______________________________________________ > Xen-devel mailing list > Xen-devel@xxxxxxxxxxxxxxxxxxx > http://lists.xensource.com/xen-devel > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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