From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gleb Natapov <gleb@redhat.com>
Subject: Re: raw disks no longer work in latest kvm (kvm-88 was fine)
Date: Sun, 7 Mar 2010 11:36:10 +0200
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References: <4B92BF97.4040001@nagafix.co.uk>
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To: Antoine Martin <antoine@nagafix.co.uk>
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On Sun, Mar 07, 2010 at 03:48:23AM +0700, Antoine Martin wrote:
> Hi,
> 
> With qemu-kvm-0.12.3:
> ./qemu-system-x86_64 [..] -drive file=/dev/sdc9,if=virtio,cache=none [..]
> [    1.882843]  vdc:
> [    2.365154] udev: starting version 146
> [    2.693768] end_request: I/O error, dev vdc, sector 126
> [    2.693772] Buffer I/O error on device vdc, logical block 126
> [    2.693775] Buffer I/O error on device vdc, logical block 127
> [    2.693777] Buffer I/O error on device vdc, logical block 128
> [    2.693779] Buffer I/O error on device vdc, logical block 129
> [    2.693781] Buffer I/O error on device vdc, logical block 130
> [    2.693783] Buffer I/O error on device vdc, logical block 131
> [    2.693785] Buffer I/O error on device vdc, logical block 132
> [    2.693787] Buffer I/O error on device vdc, logical block 133
> [    2.693788] Buffer I/O error on device vdc, logical block 134
> [    2.693814] end_request: I/O error, dev vdc, sector 0
> [    3.144870] end_request: I/O error, dev vdc, sector 0
> [    3.499377] end_request: I/O error, dev vdc, sector 0
> [    3.523247] end_request: I/O error, dev vdc, sector 0
> [    3.547130] end_request: I/O error, dev vdc, sector 0
> [    3.550076] end_request: I/O error, dev vdc, sector 0
> 
> Works fine with kvm-88:
> cp  /usr/src/KVM/kvm-88/pc-bios/*bin ./
> cp /usr/src/KVM/kvm-88/x86_64-softmmu/qemu-system-x86_64 ./
> ./qemu-system-x86_64 [..] -drive file=/dev/sdc9,if=virtio,cache=none [..]
> 
> [    1.650274]  vdc: unknown partition table
> [  112.704164] EXT4-fs (vdc): mounted filesystem with ordered data mode
> 
> I've tried running as root, using the block device directly (as
> shown above) rather than using a softlink, etc..
> 
> Something broke.
> Host and guest are both running 2.6.33 and latest KVM.
> 
Are you sure you have write access to the block device?

--
			Gleb.