Re: [Qemu-devel] [PATCH][v12] megasas: LSI Megaraid SAS HBA emulation

[Gerhard Wiesinger <lists@wiesinger.com>]

On Mon, 20 Feb 2012, Hannes Reinecke wrote:

> On 02/18/2012 01:38 PM, Gerhard Wiesinger wrote:
>> Hello Hannes,
>>
>> Patch applies well to qemu tree and with a one line modification to
>> qemu-kvm.
>>
>> My testcase was to install Fedora 16 x64 on qemu-kvm. Unfortunatly
>> it was NOT successful.
>>
>> 1.) Strange thing is that udevd got into timeouts and tries to kill
>> a lot afterwards.
>> 2.) Report that udevadm settle - timeout of 120 seconds reached, the
>> event queue contains: ....
>> 3.) Then it hangs in Examining Devices ...
>>
>> Looks like that hd device is dead.
>>
>> With LSI 53C895A everything is fine and install works well.
>>
>> Any ideas?
>>
>> Command line:
>> /root/download/qemu/git/qemu-kvm/x86_64-softmmu/qemu-system-x86_64
>>  -device megasas,id=raid,romfile=BIOS/MegaSAS.rom
>> -drive file=VM-FEDORA/fedora.qcow2,if=none,cache=unsafe,id=id0
>> -device scsi-disk,drive=id0
>> -cdrom ISO/Fedora-16-x86_64-DVD.iso
>> -boot order=cad,menu=on -m 2048 -k de -vga vmware -vnc :0
>> -bios /root/download/seabios/git/seabios/out/bios.bin
>> -device rtl8139,mac=00:02:44:92:87:6a,vlan=0,romfile=
>> -net tap,ifname=tap0,script=no,downscript=no,vlan=0
>> -device pcnet,mac=1a:46:0b:ca:bc:7e,vlan=1,romfile=
>> -net tap,ifname=tap1,script=no,downscript=no,vlan=1
>>
>
> MSI-X support is buggered, and due to a bug in megasas.c you cannot
> switch it off :-(
>
> Please try with this patch:
>
> diff --git a/hw/megasas.c b/hw/megasas.c
> index 26cc355..4f74ab6 100644
> --- a/hw/megasas.c
> +++ b/hw/megasas.c
> @@ -1972,7 +1977,6 @@ static int megasas_scsi_init(PCIDevice *dev)
>                           0x40000);
>
>     pci_register_bar(&s->dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY,
> &s->mmio_io);
> -    s->flags |= MEGASAS_FLAG_USE_MSIX;
>     memory_region_init(&s->msix_io, "megasas-msix", 4096);
>     if (megasas_use_msix(s) && !msix_init(&s->dev, 1, &s->msix_io,
> 1, 0)) {
>         pci_register_bar(&s->dev, 1, PCI_BASE_ADDRESS_SPACE_MEMORY,

Can confirm that V12 + patch above fixes the problem.

BTW: What is MSI-X?

Ciao,
Gerhard

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