Re: [PATCH v6 2/7] arm64: Introduce VA_BITS and translation level options

From: Jungseok Lee
Date: Tue Jul 15 2014 - 10:53:28 EST

On Jul 15, 2014, at 7:41 AM, Catalin Marinas wrote:
> On Mon, Jul 14, 2014 at 09:38:59PM +0100, Joel Schopp wrote:
>> I agree that these patches would be very useful. I just rebased my fix
>> for a VTTBR_BADDR_MASK bug on one of these patches that could be pulled
>> out independently. See
>> The original author Jungseok Lee is no longer available to work on
>> future versions of these patches. I was thinking that if they didn't
>> get picked up as they are that with the original author's blessing I
>> would pick them up and keep them forward ported/resubmitted. I have an
>> SOC to test them on.
> The patches are pretty good. I'll give them a try tomorrow and if there
> isn't something fundamental missing I'll consider taking them for 3.17.

Hi All,

If only stage1 side is taken and merged, KVM should be disabled under 4 level
lookups with the following configuration adjustment. I've tested it on top of
arm64/for-next/core branch and it works fine.

--- a/arch/arm64/kvm/Kconfig
+++ b/arch/arm64/kvm/Kconfig
@@ -18,6 +18,7 @@ if VIRTUALIZATION

config KVM
bool "Kernel-based Virtual Machine (KVM) support"
+ depends on !ARM64_4_LEVELS

However, I don't know whether it does make sense or not.
In other words, stage2 side should be prepared to fully support 4 level lookups.

In order to cover all combinations of host and guest, VTTBR_X should be determined
dynamically as referring to hardware capability. At this point, the patches have
been revised many times, but they don't have got ACKs from Christoffer and Marc yet.

That is why the patches are pending now in the author's point of view.

- Jungseok Lee--
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