On 19/10/18 12:35, Catalin Marinas wrote:

On Tue, Oct 16, 2018 at 05:14:39PM +0100, Kristina Martsenko wrote:

quoted

On 05/10/2018 10:04, Ramana Radhakrishnan wrote:

quoted

On 05/10/2018 09:47, Kristina Martsenko wrote:

[...]

quoted

The other option is to turn off trapping entirely. However then on a
big.LITTLE system with mismatched pointer authentication support
instructions will work intermittently on some CPUs but not others.

That's another case but let's assume we never see such configurations ;).

I'd like to put it on the record that I'm not willing to support such a
configuration. So my ask is that if we detect a system where only some
of the CPUs have pointer authentication support, we either:

1) prevent some of the CPUs from booting (that's harsh)
2) disable KVM (that's easy)

I'm perfectly happy with (2).

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...