core-agent-linux/boot/grub.qubes

# make sure to use /dev/mapper/dmroot, not /dev/xvda directly - both have the
# same fs, including UUID
GRUB_DEVICE=/dev/mapper/dmroot
GRUB_DISABLE_LINUX_UUID=true
GRUB_DISABLE_OS_PROBER=true
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX root=/dev/mapper/dmroot console=tty0 console=hvc0"
# make SWIOTLB smaller - it isn't really needed unless PCI passthrough is used,
# and even then, 16MB is enough
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX swiotlb=8192"
# add noresume - to avoid a 30 second hang on Debian HVM boot as it tries to
# locate swap space for hibernation
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX noresume"
GRUB_TIMEOUT=0
Ship grub configuration Qubes VM require few config options in grub. Ship appropriate configuration. Debian have grub.d support, so it can be done cleanly. On Fedora, /etc/default/grub needs to be modified. Still keep the options in separate file, but include it manually from /etc/default/grub. QubesOS/qubes-issues#2577 2017-06-13 01:36:12 +02:00			`# make sure to use /dev/mapper/dmroot, not /dev/xvda directly - both have the`
			`# same fs, including UUID`
grub: override GRUB_DEVICE with /dev/mapper/dmroot Grub scripts are very persistent in trying to use what is currently mounted as /. Even if currently (TemplateVM) /dev/xvda3 is mounted directly, all the configuration should use /dev/mapper/dmroot, to work also in AppVM. GRUB_DEVICE is used in various places as root device (including constructing root= parameter in some versions). Force it to /dev/mapper/dmroot QubesOS/qubes-issues#6174 2020-11-02 04:33:56 +01:00			`GRUB_DEVICE=/dev/mapper/dmroot`
Ship grub configuration Qubes VM require few config options in grub. Ship appropriate configuration. Debian have grub.d support, so it can be done cleanly. On Fedora, /etc/default/grub needs to be modified. Still keep the options in separate file, but include it manually from /etc/default/grub. QubesOS/qubes-issues#2577 2017-06-13 01:36:12 +02:00			`GRUB_DISABLE_LINUX_UUID=true`
			`GRUB_DISABLE_OS_PROBER=true`
console=hvc0 must be last https://github.com/QubesOS/qubes-issues/issues/5490#issuecomment-562263712 2019-12-07 17:56:53 +01:00			`GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX root=/dev/mapper/dmroot console=tty0 console=hvc0"`
Update grub configuration This configuration isn't included twice - it's Debian post-installation script of grub that copy settings to /etc/default/grub, which results in parameters being duplicated. Leave it as is for now. Add GRUB_TIMEOUT=0 for faster VM startup. QubesOS/qubes-issues#2577 2017-06-13 01:36:12 +02:00			`# make SWIOTLB smaller - it isn't really needed unless PCI passthrough is used,`
			`# and even then, 16MB is enough`
			`GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX swiotlb=8192"`
grub: add noresume to kernel cmdline Under R4.0, when Debian HVMs are created from the debian-9 template, they hang on boot for 30 seconds without this option. 2018-06-26 13:02:34 +02:00			`# add noresume - to avoid a 30 second hang on Debian HVM boot as it tries to`
			`# locate swap space for hibernation`
			`GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX noresume"`
Update grub configuration This configuration isn't included twice - it's Debian post-installation script of grub that copy settings to /etc/default/grub, which results in parameters being duplicated. Leave it as is for now. Add GRUB_TIMEOUT=0 for faster VM startup. QubesOS/qubes-issues#2577 2017-06-13 01:36:12 +02:00			`GRUB_TIMEOUT=0`