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Prevent multiple VMs from simultaneously writing to same USB block device physical addresses #1081

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nvesely opened this Issue Jul 23, 2015 · 28 comments

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@nvesely

nvesely commented Jul 23, 2015

Referencing #1072, it would be nice at some point to implement a feature to the block device framework to prevent multiple VMs from simultaneously being able to write to the same physical addresses on a USB block device.

@marmarek marmarek added this to the Release 3.1 milestone Oct 8, 2015

@marmarek marmarek modified the milestones: Release 4.0, Release 3.1 Feb 8, 2016

@marmarek marmarek modified the milestones: Release 3.2, Release 4.0 May 16, 2016

@marmarek marmarek self-assigned this May 16, 2016

marmarek added a commit to marmarek/old-qubes-vmm-xen that referenced this issue May 18, 2016

hotplug: trigger udev event when attaching/detaching a block device
This is used to update information on given device (for example hide
partitions when whole device is attached).

Fixes QubesOS/qubes-issues#1081

marmarek added a commit to marmarek/qubes-linux-utils that referenced this issue May 18, 2016

udev: fix deadlock on xenstore access during dom0 boot
During early dom0 boot, before xenstored is started any access to it
through /proc/xen/xenbus (or /dev/xen/xenbus) will wait until xenstored
is started. If that happens in script ordered to start before xenstored,
we have a deadlock. Prevent this by using `xenstore-ls -s` in dom0,
which will fail immediately when xenstored isn't running yet. This fail
isn't a problem, because when xenstored isn't running yet, surely device
isn't attached anywhere.

QubesOS/qubes-issues#1081
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marmarek commented May 25, 2016

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The package xen-4.6.1-15.fc21 has been pushed to the r3.1 testing repository for the Fedora fc21 template.
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marmarek commented May 25, 2016

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The package xen-4.6.1-15.fc22 has been pushed to the r3.1 testing repository for the Fedora fc22 template.
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marmarek commented May 25, 2016

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marmarek commented May 25, 2016

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The package xen-4.6.1-15.fc20 has been pushed to the r3.1 testing repository for dom0.
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marmarek added a commit to QubesOS/qubes-linux-utils that referenced this issue Jun 25, 2016

udev/qvm-block: exclude device if its partition is already attached
This prevents simultaneous attachment of the same device (in practice)
to multiple VMs.
This change to be effective requires udev action being called when such
device is attached/detached to some domain. Script
/etc/xen/scripts/block will take care of it.

Fixes QubesOS/qubes-issues#1081

(cherry picked from commit 098bfb6)

marmarek added a commit to QubesOS/qubes-linux-utils that referenced this issue Jun 25, 2016

udev: fix deadlock on xenstore access during dom0 boot
During early dom0 boot, before xenstored is started any access to it
through /proc/xen/xenbus (or /dev/xen/xenbus) will wait until xenstored
is started. If that happens in script ordered to start before xenstored,
we have a deadlock. Prevent this by using `xenstore-ls -s` in dom0,
which will fail immediately when xenstored isn't running yet. This fail
isn't a problem, because when xenstored isn't running yet, surely device
isn't attached anywhere.

QubesOS/qubes-issues#1081

(cherry picked from commit cdbcb2e)
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marmarek commented Jun 25, 2016

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marmarek commented Jun 25, 2016

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To test this update, first enable the testing repository in /etc/apt/sources.list.d/qubes-*.list by uncommenting the line containing jessie-testing, then use the standard update command:

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To test this update, first enable the testing repository in /etc/apt/sources.list.d/qubes-*.list by uncommenting the line containing stretch-testing, then use the standard update command:

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To test this update, first enable the testing repository in /etc/apt/sources.list.d/qubes-*.list by uncommenting the line containing stretch-testing, then use the standard update command:

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To test this update, first enable the testing repository in /etc/apt/sources.list.d/qubes-*.list by uncommenting the line containing wheezy-testing, then use the standard update command:

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The package xen_4.6.1-17+deb7u1 has been pushed to the r3.1 testing repository for the Debian wheezy template.
To test this update, first enable the testing repository in /etc/apt/sources.list.d/qubes-*.list by uncommenting the line containing wheezy-testing, then use the standard update command:

sudo apt-get update && sudo apt-get dist-upgrade

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To test this update, first enable the testing repository in /etc/apt/sources.list.d/qubes-*.list by uncommenting the line containing wheezy-testing, then use the standard update command:

sudo apt-get update && sudo apt-get dist-upgrade

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To test this update, first enable the testing repository in /etc/apt/sources.list.d/qubes-*.list by uncommenting the line containing wheezy-testing, then use the standard update command:

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The package xen_2001:4.6.1-17+deb7u1 has been pushed to the r3.1 stable repository for the Debian wheezy template.
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