* Coalesced MMIO
@ 2011-06-03 17:49 Sasha Levin
2011-06-03 19:28 ` Sasha Levin
0 siblings, 1 reply; 2+ messages in thread
From: Sasha Levin @ 2011-06-03 17:49 UTC (permalink / raw)
To: kvm; +Cc: Avi Kivity, Pekka Enberg, Ingo Molnar
Hello,
I've tried using KVM_REGISTER_COALESCED_MMIO to register a coalesced
MMIO zone.
ioctl(KVM_CHECK_EXTENSION) for KVM_CAP_COALESCED_MMIO works properly
(and returns 2).
ioctl(KVM_REGISTER_COALESCED_MMIO) with the zone also works fine (and
returns 0).
What I see is that we still get KVM_EXIT_MMIO into that zone, and the
ring never gets used (first==last==0 at all times).
I've went ahead and added some debug output to QEMU, I've noticed that
while qemu registers a coalesced MMIO zone for it's VGA driver,
kvm_flush_coalesced_mmio_buffer() never has any data to flush in the
ring either.
Is it a known issue? Or am I simply not doing something right?
Thanks!
--
Sasha.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Coalesced MMIO
2011-06-03 17:49 Coalesced MMIO Sasha Levin
@ 2011-06-03 19:28 ` Sasha Levin
0 siblings, 0 replies; 2+ messages in thread
From: Sasha Levin @ 2011-06-03 19:28 UTC (permalink / raw)
To: kvm; +Cc: Avi Kivity, Pekka Enberg, Ingo Molnar
On Fri, 2011-06-03 at 20:49 +0300, Sasha Levin wrote:
> Hello,
>
> I've tried using KVM_REGISTER_COALESCED_MMIO to register a coalesced
> MMIO zone.
Looks like this issue was caused because I changed my KVM_MAX_VCPUS from
64 to 1024.
--
Sasha.
^ permalink raw reply [flat|nested] 2+ messages in thread
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