Re: [Xen-devel] [PATCH 0/6] x86/HVM: RTC/VPT adjustments

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 01.05.13 at 18:15, George Dunlap <george.dunlap@xxxxxxxxxxxxx> wrote:
> On 29/04/13 14:42, Jan Beulich wrote:
>> 1: fix processing of RTC REG_B writes
>> 2: slightly adjust RTC reset
>> 3: adjust IRQ (de-)assertion
>> 4: properly handle RTC periodic timer even when !RTC_PIE
>> 5: fix legacy PIC check in pt_update_irq()
>> 6: RTC code must be in line with WAET flags passed by hvmloader
>>
>> This fixes the Win2003 boot failure George reported. Roger, since
>> the first patch is slightly different from what you tested earlier,
>> could you re-test that patch alone and the full series against
>> FreeBSD?
>>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> 
> This series seems to fix the w2k3 issue -- but it looks like a series of 
> "fixes and updates".  I thought we had decided to revert all the RTC 
> changes?

I always said I'd prefer a partial revert over a full one, if at all
possible. Of course I'm not intending to enforce this in any way,
but I'm also not intending to myself revert good fixes (and drop
further ones, as presented in this series) without need. So my
proposed solution is this series of patches (which is a partial
revert in terms of functionality, but not any kind of revert in terms
of source code) - others can certainly propose other solutions.
This is even more so now that we know that the reason for the
observed regression weren't the RTC changes themselves, but
the expectation of non-spec-conforming emulation behavior by
the guest.

Jan


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