Balloon driver scrub memory page before giving it back to the
hypervisor. Normally this is a good thing, to avoid leaking VM's memory
data into Xen and other domains. But during initial startup when maxmem
is bigger than initial memory, on HVM and PVH, Populate-on-Demand (PoD) is in use.
This means every page on initial balloon down needs to be first mapped
by Xen into VM's memory (as it wasn't populated before - and in fact
didn't have any data), scrubbed by the kernel and then given back to
Xen. This is great waste of time. Such operation with default settings
(initial memory 400M, maxmem 4000M) can take few seconds, delaying every
VM startup (including DispVM). In extreme situation, when running inside
nested virtualization, the effect is much worse.
Avoid this problem by disabling memory scrubbing during initial boot,
and re-enable it as soon as user space kicks in - in initramfs, before
mounting root filesystem, to be sure it's enabled before memory contains
any kind of secrets.
This commit handle only one case - when kernel in managed by the VM
itself. It is critical to enable initramfs module whenever
xen_scrub_pages=0 kernel option is given, so make them depend on the
same condition and ship them in the same package.
FixesQubesOS/qubes-issues#1963
Recently some applications ships with large icons like 1024x1024
(Signal-desktop for example). To not degrade any fancy HiDPI 8K
experience, allow for that, instead of downscaling.
The max icon size is only anti-DoS protection anyway.
Don't rely on python -> python2 symlink and default %{python_*} macros.
Add explicit BR: gcc (default build env for fc29 doesn't have it
anymore).
QubesOS/qubes-issues#4223
qubes-vm@.service would already cause this ordering, but not every user
has any autostart=True VMs.
Also needed to maybe f*x QubesOS/qubes-issues#3149 at some point.
When root device is available read-write (TemplateVM/StandaloneVM), its
mounted directly, instead of using device-mapper layer. But
/dev/mapper/dmroot still needs to exists (it is pointed from
/etc/fstab), otherwise various tools, including grub-mkconfig get
confused.
Create a symlink using udev rule. It is already done in initramfs, and
in case of Fedora that udev rule/symlink survive switching to
non-initramfs udev, but not on Debian. So, add appropriate udev rules
file.
FixesQubesOS/qubes-issues#3178
The script call is quite expensive (it does multiple things, including
checking device-mapper, qubesdb etc). Don't call it for devices we (or
else) already excluded earlier.
This is the most relevant for dom0, where udev "change" event is
triggered quite often, for multiple LVM volumes - all excluded, because
being VM's disks.
* qubesos/pr/33:
drop busybox dependance
centos: fix python packages names
Remove busybox as it is not provided in RHEL7 anymore
Fix python3 package names with respect to CentOS for consistency with python34 names
Reduce code duplication by moving parsing of "QUBESRPC" magic command to
one place.
Call qubes-rpc-multiplexer directly with execve(), to avoid string
expansions in its parameters.
Controller sysfs path have changed in recent kernels ('vhci_hcd' ->
'vhci_hcd.0'), look for vhci_hcd prefix, not exact this name.
QubesOS/qubes-issues#3455
