>>> On Mon, May 22, 2006 at 9:03 AM, in message
<6085df031157d9ce198b72191501db21@xxxxxxxxxxxx>, Keir Fraser
<Keir.Fraser@xxxxxxxxxxxx> wrote:
> On 22 May 2006, at 15:51, Charles Coffing wrote:
>
>> HVM domains need some extra memory free for the shadow page tables,
>> otherwise they may crash the entire machine while they are running,
or
>> the HVM domain itself may crash (exact behavior depends on whether
you
>> have Yunhong's patch to change BUGs to domain_crash).
>>
>> This slack space is calculated into the memory size for HVM
domains,
>> but what happens if you then start a PV domain afterwards? Only
the
>> minimally required memory is freed up, then the PV domain takes it
all,
>> leaving the HVM domain with no slack == crash.
>
> Where does the slack from the previous HVM guest startup go? Are you
> saying that dom0 only frees up PV- guest- size minus existing-
slack?
Correct.
Unless, of course, the HVM domain has eaten up some of the slack in the
mean-time, in which case dom0 frees up PV-guest-size minus
remaining-slack.
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