[PATCH] ARM64: KVM: Fix coherent_icache_guest_page() for host with external L3-cache.

[Marc Zyngier]

On 2013-08-14 16:41, Peter Maydell wrote:
> On 14 August 2013 16:34, Marc Zyngier <maz at misterjones.org> wrote:
>> When userspace loads the kernel into memory, the kernel is not 
>> flushed
>> to RAM, and may sit in the L3 cache if the cache is big enough. You
>> end-up executing garbage... My proposed fix is to let kvmtool do the
>> flushing, as we have userspace cache management operations for this
>> exact purpose.
>
> Why does this issue only apply to the loaded kernel and not to
> the zero bytes in the rest of RAM? I know executing zeroes
> isn't a very useful thing to do but it should be a well defined
> thing.

Good point, and not quite sure just yet. Probably we get a zeroed, 
clean page?

Anup, can you elaborate on how your L3 cache behaves?

Thanks,

         M.
-- 
Who you jivin' with that Cosmik Debris?