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Re: [Qemu-devel] [libvirt] [PATCHv2 libvirt] qemu: Issue rtc-reset-reinj
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From: |
Eric Blake |
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Subject: |
Re: [Qemu-devel] [libvirt] [PATCHv2 libvirt] qemu: Issue rtc-reset-reinjection command after guest-set-time |
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Date: |
Tue, 19 Aug 2014 11:00:26 -0600 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.7.0 |
On 08/19/2014 10:57 AM, Marcelo Tosatti wrote:
>
> rtc-reset-reinjection has been introduced because certain Windows
> versions will advance the guest system time (via rtc interrupt
> reinjection).
>
> So if libvirt adjusts the guest system time via guest-set-time,
> allowing rtc interrupt reinjection to compensate for lost time,
> as well, will cause an incorrect guest system time.
>
> So you should always use the
>
> guest-set-time
> rtc-reset-reinjection
>
> pair.
But is that true both for the 'guest-set-time' no-arg case (which tells
the guest to read the current RTC and update in-memory time
accordingly), as well as the 'guest-set-time with time argument' case
(which tells the guest to forcefully set in-memory time, then write that
time back to the RTC)?
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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