RE: [Xen-devel] Block device not presented read-only in HVM domain

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> /dev/vbd-backend/hvm1 is an LVM volume containing a disk image with a
> partition for the root filesystem for the hvm1 domain.
> /dev/vbd-backend/usr is an LVM volume containing a disk image with a
> partition for /usr which is shared read-only across multiple HVM
domains.
> /dev/vbd-disktest/dom1 is an LVM volume that is used as a scratch
disk.
> 
> The /etc/fstab in the HVM domain has the lines:
> 
> /dev/hda1            /                    ext3       acl,user_xattr
> 1 0
> /dev/hdb1            /usr                 ext3       acl,user_xattr
> 1 0
> 
> In the domain I can write to /usr, even though it is supposed to be
shared
> read-only!
> 
> x3850-hvm1:~ # ls -l /usr/bob
> /bin/ls: /usr/bob: No such file or directory
> x3850-hvm1:~ # touch /usr/bob
> x3850-hvm1:~ # ls -l /usr/bob
> -rw-r--r-- 1 root root 0 Oct 25 14:29 /usr/bob
> x3850-hvm1:~ #

You've not using PV drivers, right?
Someone needs to extend qemu-dm to accept and respect a 'read only' flag
associated with a device.

Ian




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