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Re: [Qemu-devel] saving/loading PCI irq related state

From: andrzej zaborowski
Subject: Re: [Qemu-devel] saving/loading PCI irq related state
Date: Mon, 10 Dec 2007 00:58:29 +0100


On 27/11/2007, Uri Lublin <address@hidden> wrote:
> Hello,
> If one is not lucky he/she may lose PCI interrupts when saving and
> loading a VM.
> It seems PCI irq related state is not being saved.
> When this happens, the guest hangs/spins and the cpu usage of the
> process stays around 100%.
> Attached are three patches to fix this:
>    01 -- when saving/loading a pci device, save/load its irq_state
>    02 -- save/load PCI-Bus irq related state
>    03 -- save/load PCI-bridge (i440FX/PIIX3) irq related state
> There are two alternatives, both recalculate PCI irq related state upon
> loadvm instead of saving/loading it:
> (a) Make every PCI device DEV (e.g. rtl8139, ne2000, usb-uhci, etc) call
> its DEV_update_irq() from its state-load-function. or
> (b) Keep patch 01 and recalculate 02 and 03 by going over all
> PCI-devices on the specific Bus/Bridge.

I committed the three patches together but I changed the put/get
functions used to ones that don't assume on sizeof(int) == 4. Compile
tested only, please check if I've not screwed this up.

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