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[Qemu-devel] Re: Commit 622b520f changed -drive if=scsi, index=N, intent
From: |
Kevin Wolf |
Subject: |
[Qemu-devel] Re: Commit 622b520f changed -drive if=scsi, index=N, intentional? |
Date: |
Thu, 27 Jan 2011 13:21:22 +0100 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.15) Gecko/20101027 Fedora/3.0.10-1.fc12 Thunderbird/3.0.10 |
Am 27.01.2011 13:10, schrieb Markus Armbruster:
> Consider -drive if=scsi,index=12,...
>
> Before the commit, index=12 meant bus=1,unit=5. Example:
>
> [...]
>
> Two scsi-buses, and scsi1-cd5 with scsi-id 5 is on the second one,
> i.e. bus=1, unit=5.
>
> After the commit, it means bus=0,unit=12. The drive is created, but not
> the guest device. That's because lsi53c895a supports only 7 units
> (LSI_MAX_DEVS), and scsi_bus_legacy_handle_cmdline() ignores drives with
> unit numbers exceeding that limit. Example:
>
> [...]
>
> One scsi-bus, and scsi1-cd5 nowhere to be found.
>
> I'd call this a regression.
>
> What now?
That's a really good question. We could do something like this:
--- a/blockdev.c
+++ b/blockdev.c
@@ -192,7 +192,7 @@ DriveInfo *drive_init(QemuOpts *opts, int
default_to_scsi)
max_devs = MAX_IDE_DEVS;
} else if (!strcmp(buf, "scsi")) {
type = IF_SCSI;
- max_devs = MAX_SCSI_DEVS;
+ max_devs = 7;
} else if (!strcmp(buf, "floppy")) {
type = IF_FLOPPY;
max_devs = 0;
That's very obviously not much more than a hack, but I don't think
blockdev.c can get the real number easily (please prove me wrong). With
this hack, we would get the old behaviour for -drive (which doesn't use
any other controller anyway) and you can still use -device to attach
more devices to a non-lsi bus.
Kevin
- [Qemu-devel] Commit 622b520f changed -drive if=scsi, index=N, intentional?, Markus Armbruster, 2011/01/27
- [Qemu-devel] Re: Commit 622b520f changed -drive if=scsi, index=N, intentional?,
Kevin Wolf <=
- Re: [Qemu-devel] Commit 622b520f changed -drive if=scsi, index=N, intentional?, Daniel P. Berrange, 2011/01/27
- [Qemu-devel] Re: Commit 622b520f changed -drive if=scsi, index=N, intentional?, Paolo Bonzini, 2011/01/27