From: Paolo Bonzini <pbonzini@redhat.com>
To: Avi Kivity <avi@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>,
Jan Kiszka <jan.kiszka@web.de>, xming <xmingske@gmail.com>,
Gerd Hoffmann <kraxel@redhat.com>,
kvm@vger.kernel.org, qemu-devel <qemu-devel@nongnu.org>
Subject: Re: kvm crashes with spice while loading qxl
Date: Tue, 08 Mar 2011 10:28:54 +0100 [thread overview]
Message-ID: <4D75F6D6.1000600@redhat.com> (raw)
In-Reply-To: <4D75F440.6010401@redhat.com>
On 03/08/2011 10:17 AM, Avi Kivity wrote:
>> Memory map can be protected by a read-write lock initially, so that vcpu
>> thread holds it for read. Later can be converted to URCU.
>
> rwlock is insufficient, need a way to force the vcpu off so a writer can
> actually do something.
>
> So we need some kind of priority rwlock where a reader lets the lock
> know how it can force it off in case a writer comes along.
If the reader is the VCPU thread, the VCPU thread can always be bounced
via qemu_cpu_kick.
Paolo
WARNING: multiple messages have this Message-ID (diff)
From: Paolo Bonzini <pbonzini@redhat.com>
To: Avi Kivity <avi@redhat.com>
Cc: kvm@vger.kernel.org, Marcelo Tosatti <mtosatti@redhat.com>,
qemu-devel <qemu-devel@nongnu.org>, xming <xmingske@gmail.com>,
Jan Kiszka <jan.kiszka@web.de>, Gerd Hoffmann <kraxel@redhat.com>
Subject: [Qemu-devel] Re: kvm crashes with spice while loading qxl
Date: Tue, 08 Mar 2011 10:28:54 +0100 [thread overview]
Message-ID: <4D75F6D6.1000600@redhat.com> (raw)
In-Reply-To: <4D75F440.6010401@redhat.com>
On 03/08/2011 10:17 AM, Avi Kivity wrote:
>> Memory map can be protected by a read-write lock initially, so that vcpu
>> thread holds it for read. Later can be converted to URCU.
>
> rwlock is insufficient, need a way to force the vcpu off so a writer can
> actually do something.
>
> So we need some kind of priority rwlock where a reader lets the lock
> know how it can force it off in case a writer comes along.
If the reader is the VCPU thread, the VCPU thread can always be bounced
via qemu_cpu_kick.
Paolo
next prev parent reply other threads:[~2011-03-08 9:29 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-26 11:43 kvm crashes with spice while loading qxl xming
2011-02-26 12:29 ` Jan Kiszka
2011-02-26 12:29 ` [Qemu-devel] " Jan Kiszka
2011-02-26 14:44 ` xming
2011-02-26 14:44 ` [Qemu-devel] " xming
2011-02-27 19:03 ` Alon Levy
2011-02-27 19:03 ` Alon Levy
2011-02-27 19:11 ` Jan Kiszka
2011-02-27 19:11 ` Jan Kiszka
2011-02-27 19:16 ` Alon Levy
2011-02-27 19:16 ` Alon Levy
2011-02-27 19:27 ` Jan Kiszka
2011-02-27 19:27 ` Jan Kiszka
2011-02-27 19:29 ` Alon Levy
2011-02-27 19:29 ` Alon Levy
2011-02-27 19:32 ` Alon Levy
2011-02-27 19:32 ` Alon Levy
2011-03-01 12:58 ` Alon Levy
2011-03-01 12:58 ` Alon Levy
2011-03-02 8:22 ` Jan Kiszka
2011-03-02 10:56 ` Alon Levy
2011-03-02 10:56 ` Alon Levy
2011-03-02 11:34 ` Jan Kiszka
2011-03-02 12:32 ` Alon Levy
2011-03-02 12:32 ` Alon Levy
2011-02-28 12:56 ` xming
2011-03-01 3:56 ` Rick Vernam
2011-03-01 3:56 ` [Qemu-devel] " Rick Vernam
2011-03-05 16:35 ` Marcelo Tosatti
2011-03-05 16:35 ` [Qemu-devel] " Marcelo Tosatti
2011-03-05 17:11 ` Paolo Bonzini
2011-03-05 17:11 ` [Qemu-devel] " Paolo Bonzini
2011-03-06 10:30 ` Alon Levy
2011-03-06 10:30 ` [Qemu-devel] " Alon Levy
2011-03-07 16:02 ` Marcelo Tosatti
2011-03-07 16:02 ` [Qemu-devel] " Marcelo Tosatti
2011-03-06 10:38 ` Avi Kivity
2011-03-06 10:38 ` [Qemu-devel] " Avi Kivity
2011-03-07 16:13 ` Marcelo Tosatti
2011-03-07 16:13 ` [Qemu-devel] " Marcelo Tosatti
2011-03-07 22:27 ` Paolo Bonzini
2011-03-07 22:27 ` [Qemu-devel] " Paolo Bonzini
2011-03-08 9:17 ` Avi Kivity
2011-03-08 9:17 ` [Qemu-devel] " Avi Kivity
2011-03-08 9:28 ` Paolo Bonzini [this message]
2011-03-08 9:28 ` Paolo Bonzini
2011-03-08 9:32 ` Avi Kivity
2011-03-08 9:32 ` [Qemu-devel] " Avi Kivity
2011-04-26 8:53 ` Gerd Hoffmann
2011-04-26 8:53 ` [Qemu-devel] " Gerd Hoffmann
2011-04-26 9:06 ` Jan Kiszka
2011-04-26 9:06 ` [Qemu-devel] " Jan Kiszka
2011-04-26 9:43 ` Gerd Hoffmann
2011-04-26 9:43 ` [Qemu-devel] " Gerd Hoffmann
2011-04-26 9:34 ` Alon Levy
2011-04-26 9:34 ` [Qemu-devel] " Alon Levy
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