On 04/26/2013 03:42 PM, Peter Maydell wrote:
On 26 April 2013 14:24, Andre Przywara <[email protected]> wrote:
On 04/26/2013 03:18 PM, Peter Maydell wrote:
The obvious question here is "why do we need a new command?".
The kernel booting specification says "boot the kernel in
Hyp mode" so we should just always do that for booting Linux,
surely?
Because it avoids regressions. I kind of feel uneasy to do a lot of
tinkering with secure state and the GIC unconditionally, especially if
enabled on many boards with virt-capable CPUs.
There aren't exactly very many of those out there, so if we
default to "boot in HYP mode" then (a) KVM will just work
out of the box and (b) people doing u-boot ports to their
board will find any issues and be able to submit fixes.
If we don't turn it on by default then we'll end up stuck
in a world where KVM doesn't work on half the virt capable
boards out there.
OK, that's a point. I changed the code already and will include it in
the next revision.
Thanks,
Andre.
I have no objection to a "turn this off" escape hatch if
you think it's useful.
-- PMM
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