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xen-devel
RE: [Xen-devel] [PATCH] fix the time issue on x86_64
Ian Pratt wrote:
> > 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
So, do we need this patch? I think it should be OK for xen0.
-Xin
>
>
>> 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
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