core-agent-linux/misc/grub.qubes

# make sure to use /dev/mapper/dmroot, not /dev/xvda directly - both have the
# same fs, including UUID
GRUB_DISABLE_LINUX_UUID=true
GRUB_DISABLE_OS_PROBER=true
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX root=/dev/mapper/dmroot console=hvc0 console=tty0"
# make SWIOTLB smaller - it isn't really needed unless PCI passthrough is used,
# and even then, 16MB is enough
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX swiotlb=8192"
GRUB_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_DISABLE_LINUX_UUID=true`
			`GRUB_DISABLE_OS_PROBER=true`
grub: add console=tty0 to kernel cmdline When there is only console=hvc0 (i.e. no output to emulated VGA) and GRUB_TIMEOUT is set to 0, VM startup hangs. This may be very well some race condition broken by either of console=tty0 or GRUB_TIMEOUT > 0, but even in such a case, apply this as a workaround for now. 2017-07-05 12:52:43 +02:00			`GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX root=/dev/mapper/dmroot console=hvc0 console=tty0"`
Update grub configuration This configuration isn't included twice - it's Debian post-installation script of grub that copy settings to /etc/default/grub, which results in parameters being duplicated. Leave it as is for now. Add GRUB_TIMEOUT=0 for faster VM startup. QubesOS/qubes-issues#2577 2017-06-13 01:36:12 +02:00			`# make SWIOTLB smaller - it isn't really needed unless PCI passthrough is used,`
			`# and even then, 16MB is enough`
			`GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX swiotlb=8192"`
			`GRUB_TIMEOUT=0`