[PATCH v6 11/26] KVM: arm64: Fix HYP idmap unmap when using 52bit PA

[Catalin Marinas]

On Wed, Mar 14, 2018 at 04:50:34PM +0000, Marc Zyngier wrote:
> Unmapping the idmap range using 52bit PA is quite broken, as we
> don't take into account the right number of PGD entries, and rely
> on PTRS_PER_PGD. The result is that pgd_index() truncates the
> address, and we end-up in the weed.
> 
> Let's introduce a new unmap_hyp_idmap_range() that knows about this,
> together with a kvm_pgd_index() helper, which hides a bit of the
> complexity of the issue.
> 
> Fixes: 98732d1b189b ("KVM: arm/arm64: fix HYP ID map extension to 52 bits")
> Reported-by: James Morse <james.morse at arm.com>
> Signed-off-by: Marc Zyngier <marc.zyngier at arm.com>

It looks fine to me:

Reviewed-by: Catalin Marinas <catalin.marinas at arm.com>