[PATCH 17/21] arm64: KVM: Map the kernel RO section into HYP

Marc Zyngier marc.zyngier at arm.com
Mon Nov 16 06:43:26 PST 2015

On 16/11/15 14:27, Mark Rutland wrote:
> On Mon, Nov 16, 2015 at 01:11:55PM +0000, Marc Zyngier wrote:
>> In order to run C code in HYP, we must make sure that the kernel's
>> RO section in mapped into HYP (otherwise things break badly).
> Somewhat tangential, but do we have any strong guarantees that the hyp
> text is otherwise safe in its address space which differs from that of
> the kernel proper?
> i.e. do we need something like we did for the EFI stub in commit
> e8f3010f7326c003 ("arm64/efi: isolate EFI stub from the kernel proper")?

Probably. That will make things more difficult for VHE, where there are
function calls between the kernel and the "hypervisor" (kvm_call_hyp()
and panic() are the most obvious ones).

I'll have a look, thanks for the pointer.

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

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