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To emulate a register access, KVM uses a table of registers sorted by register encoding to speed up queries using binary search. When Linux boots, KVM checks that the table is sorted and uses a BUG_ON() statement to let the user know if it's not. The unfortunate side effect is that an unsorted sysreg table brings down the whole kernel, not just KVM, even though the rest of the kernel can function just fine without KVM. To make matters worse, on machines which lack a serial console, the user is left pondering why the machine is taking so long to boot. Improve this situation by returning an error from kvm_arch_init() if the sysreg tables are not in the correct order. The machine is still very much usable for the user, with the exception of virtualization, who can now easily determine what went wrong. A minor typo has also been corrected in the check_sysreg_table() function. Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20220428103405.70884-2-alexandru.elisei@arm.com |
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boot | ||
configs | ||
crypto | ||
hyperv | ||
include | ||
kernel | ||
kvm | ||
lib | ||
mm | ||
net | ||
tools | ||
xen | ||
Kbuild | ||
Kconfig | ||
Kconfig.debug | ||
Kconfig.platforms | ||
Makefile |