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Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update v
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update vm irq routing table |
Date: |
Tue, 26 Nov 2013 16:58:53 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130923 Thunderbird/17.0.9 |
Il 26/11/2013 16:35, Avi Kivity ha scritto:
>>>> If we want to ensure, we need to use a different mechanism for
>>>> synchronization than the global RCU. QRCU would work; readers are not
>>>> wait-free but only if there is a concurrent synchronize_qrcu, which
>>>> should be rare.
>>> An alternative path is to convince ourselves that the hardware does not
>>> provide the guarantees that the current code provides, and so we can
>>> relax them.
>> No, I think it's a reasonable guarantee to provide.
>
> Why?
Because IIUC the semantics may depend not just on the interrupt
controller, but also on the specific PCI device. It seems safer to
assume that at least one device/driver pair wants this to work.
(BTW, PCI memory writes are posted, but configuration writes are not).
Paolo
- Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update vm irq routing table, (continued)
- Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update vm irq routing table, Avi Kivity, 2013/11/26
- Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update vm irq routing table, Paolo Bonzini, 2013/11/26
- Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update vm irq routing table, Avi Kivity, 2013/11/26
- Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update vm irq routing table, Paolo Bonzini, 2013/11/26
- Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update vm irq routing table, Avi Kivity, 2013/11/26
- Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update vm irq routing table, Gleb Natapov, 2013/11/26
- Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update vm irq routing table, Paolo Bonzini, 2013/11/26
- Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update vm irq routing table, Avi Kivity, 2013/11/26
- Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update vm irq routing table, Paolo Bonzini, 2013/11/26
- Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update vm irq routing table, Avi Kivity, 2013/11/26
- Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update vm irq routing table,
Paolo Bonzini <=
- Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update vm irq routing table, Avi Kivity, 2013/11/26
- Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update vm irq routing table, Michael S. Tsirkin, 2013/11/26
- Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update vm irq routing table, Avi Kivity, 2013/11/26
- Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update vm irq routing table, Paolo Bonzini, 2013/11/26
- Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update vm irq routing table, Michael S. Tsirkin, 2013/11/26
- Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update vm irq routing table, Gleb Natapov, 2013/11/26
- Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update vm irq routing table, Avi Kivity, 2013/11/26
- Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update vm irq routing table, Gleb Natapov, 2013/11/26
- Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update vm irq routing table, Paolo Bonzini, 2013/11/26
- Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update vm irq routing table, Avi Kivity, 2013/11/26