Re: powerpc/64: Call H_REGISTER_PROC_TBL when running as a HPT guest on POWER9

[Michael Ellerman <patch-notifications@ellerman.id.au>]

On Thu, 2017-02-16 at 05:03:39 UTC, Paul Mackerras wrote:
> On POWER9, since commit cc3d2940133d ("powerpc/64: Enable use of radix
> MMU under hypervisor on POWER9", 2017-01-30), we set both the radix and
> HPT bits in the client-architecture-support (CAS) vector, which tells
> the hypervisor that we can do either radix or HPT.  According to PAPR,
> if we use this combination we are promising to do a H_REGISTER_PROC_TBL
> hcall later on to let the hypervisor know whether we are doing radix
> or HPT.  We currently do this call if we are doing radix but not if
> we are doing HPT.  If the hypervisor is able to support both radix
> and HPT guests, it would be entitled to defer allocation of the HPT
> until the H_REGISTER_PROC_TBL call, and to fail any attempts to create
> HPTEs until the H_REGISTER_PROC_TBL call.  Thus we need to do a
> H_REGISTER_PROC_TBL call when we are doing HPT; otherwise we may
> crash at boot time.
> 
> This adds the code to call H_REGISTER_PROC_TBL in this case, before
> we attempt to create any HPT entries using H_ENTER.
> 
> Fixes: cc3d2940133d ("powerpc/64: Enable use of radix MMU under hypervisor on POWER9")
> Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
> Reviewed-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/dbfcf3cb9c681aa0c5d0bb46068f98

cheers