From: Avi Kivity <avi@redhat.com>
To: Glauber Costa <glommer@gmail.com>
Cc: Glauber Costa <glommer@redhat.com>,
aliguori@us.ibm.com, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 4/7] qemu_flush_work for remote vcpu execution
Date: Mon, 30 Nov 2009 14:06:23 +0200 [thread overview]
Message-ID: <4B13B53F.2060207@redhat.com> (raw)
In-Reply-To: <5d6222a80911300344y7ad2fdf0odff84d3767abcdc3@mail.gmail.com>
On 11/30/2009 01:44 PM, Glauber Costa wrote:
>> I really dislike this. In general vcpu ioctls are used as components of
>> some work to be done, for example RMW of some state. In this case it is
>> meaningless to execute the ioctls remotely, you need to execute the entire
>> RMW remotely instead.
>>
>>
> Why? The "M" part of RMW is executed in shared memory.
> Only the R and W parts have any restrictions on where to be executed.
>
>
If the guest continues to run during the RMW, you will get inconsistent
results.
This may be prevented by qemu_mutex, but I'd rather not rely on it.
Also, I'd like remote operations to be visible.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2009-11-30 12:06 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-26 17:24 [Qemu-devel] [PATCH 0/7] KVM SMP support, early version Glauber Costa
2009-11-26 17:24 ` [Qemu-devel] [PATCH 1/7] Don't mess with halted state Glauber Costa
2009-11-26 17:24 ` [Qemu-devel] [PATCH 2/7] store thread-specific env information Glauber Costa
2009-11-26 17:24 ` [Qemu-devel] [PATCH 3/7] update halted state on mp_state sync Glauber Costa
2009-11-26 17:24 ` [Qemu-devel] [PATCH 4/7] qemu_flush_work for remote vcpu execution Glauber Costa
2009-11-26 17:24 ` [Qemu-devel] [PATCH 5/7] tell kernel about all registers instead of just mp_state Glauber Costa
2009-11-26 17:24 ` [Qemu-devel] [PATCH 6/7] Don't call kvm cpu reset on initialization Glauber Costa
2009-11-26 17:25 ` [Qemu-devel] [PATCH 7/7] remove smp restriction from kvm Glauber Costa
2009-11-29 15:32 ` [Qemu-devel] [PATCH 5/7] tell kernel about all registers instead of just mp_state Avi Kivity
2009-11-30 11:45 ` Glauber Costa
2009-11-30 12:04 ` Gleb Natapov
2009-11-30 12:05 ` Avi Kivity
2009-11-30 13:31 ` Glauber Costa
2009-11-30 13:32 ` Avi Kivity
2009-11-29 15:32 ` [Qemu-devel] [PATCH 4/7] qemu_flush_work for remote vcpu execution Avi Kivity
2009-11-30 11:44 ` Glauber Costa
2009-11-30 12:06 ` Avi Kivity [this message]
2009-11-30 11:48 ` [Qemu-devel] " Paolo Bonzini
2009-11-29 15:29 ` [Qemu-devel] [PATCH 2/7] store thread-specific env information Avi Kivity
2009-11-29 15:38 ` Andreas Färber
2009-11-29 15:42 ` Avi Kivity
2009-11-29 16:00 ` Andreas Färber
2009-11-29 22:29 ` Jamie Lokier
2009-11-30 11:36 ` [Qemu-devel] " Paolo Bonzini
2009-11-30 11:41 ` Glauber Costa
2009-11-30 11:49 ` Paolo Bonzini
2009-11-30 12:07 ` Avi Kivity
2009-11-29 17:32 ` [Qemu-devel] Re: [PATCH 0/7] KVM SMP support, early version Jan Kiszka
2009-11-30 11:42 ` Glauber Costa
2009-11-30 15:55 ` Glauber Costa
2009-11-30 16:40 ` Avi Kivity
2009-11-30 16:47 ` Glauber Costa
2009-11-30 17:30 ` Jan Kiszka
2009-12-01 12:10 ` Avi Kivity
2009-12-01 12:17 ` Jan Kiszka
2009-12-01 12:20 ` Glauber Costa
2009-12-01 12:33 ` Jan Kiszka
2009-11-30 16:50 ` Avi Kivity
2009-12-01 0:31 ` [Qemu-devel] " Ed Swierk
2009-12-01 0:42 ` Ed Swierk
2009-12-01 12:20 ` Alexander Graf
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