Re: [PATCH v3 00/22] powerpc: Add KUAP support for BOOKE and 40x

On Tue, 19 Oct 2021 09:29:11 +0200, Christophe Leroy wrote:

On booke/40x we don't have segments like book3s/32.
On booke/40x we don't have access protection groups like 8xx.

Use the PID register to provide user access protection.
Kernel address space can be accessed with any PID.
User address space has to be accessed with the PID of the user.
User PID is always not null.

[...]

Applied to powerpc/next.

[01/22] Revert "powerpc: Inline setup_kup()"
        https://git.kernel.org/powerpc/c/6c1fa60d368e6b752e1612eae9bb0970e85392b2
[02/22] powerpc/8xx: Activate KUEP at all time
        https://git.kernel.org/powerpc/c/13dac4e31e75ce10b2fcaad4432a24dae6c955f6
[03/22] powerpc/44x: Activate KUEP at all time
        https://git.kernel.org/powerpc/c/ee2631603fdbab6f76e86ea87f7a03ebc3a1ef85
[04/22] powerpc/book3e: Activate KUEP at all time
        https://git.kernel.org/powerpc/c/dc3a0e5b83a8806d7da1f343a7d2e0be386d16d2
[05/22] powerpc/32s: Remove capability to disable KUEP at boottime
        https://git.kernel.org/powerpc/c/df415cd758261bceff27f34a145dd8328bbfb018
[06/22] powerpc/32s: Do kuep_lock() and kuep_unlock() in assembly
        https://git.kernel.org/powerpc/c/526d4a4c77aedf1b7df1133e5cced29c70232e6e
[07/22] powerpc/32s: Save content of sr0 to avoid 'mfsr'
        https://git.kernel.org/powerpc/c/70428da94c7ad692d306747a04117543827292a7
[08/22] powerpc/kuep: Remove 'nosmep' boot time parameter except for book3s/64
        https://git.kernel.org/powerpc/c/6754862249d324b11f1361a5353e234325d805ec
[09/22] powerpc/kuap: Add a generic intermediate layer
        https://git.kernel.org/powerpc/c/ba454f9c8e4efcc47c772b7642a5c8c6d1343cbf
[10/22] powerpc/kuap: Check KUAP activation in generic functions
        https://git.kernel.org/powerpc/c/c252f3846d3114542c606618995e3cbc11775357
[11/22] powerpc/kuap: Remove __kuap_assert_locked()
        https://git.kernel.org/powerpc/c/2341964e27b02b2ca1deef8a18df59d1db7b9085
[12/22] powerpc/kuap: Add kuap_lock()
        https://git.kernel.org/powerpc/c/937fb7003ee1f37faed1f1a4ece46e8a14863d92
[13/22] powerpc/nohash: Move setup_kuap out of 8xx.c
        https://git.kernel.org/powerpc/c/25ae981fafaa140a12e4c830992b4fe997071124
[14/22] powerpc/config: Add CONFIG_BOOKE_OR_40x
        https://git.kernel.org/powerpc/c/047a6fd40199eb55ffd18091f7ceae9743d972bf
[15/22] powerpc/kuap: Prepare for supporting KUAP on BOOK3E/64
        https://git.kernel.org/powerpc/c/42e03bc5240b75007682d9941ef672d12828fc70
[16/22] powerpc/kuap: Make PPC_KUAP_DEBUG depend on PPC_KUAP only
        https://git.kernel.org/powerpc/c/e3c02f25b4296c48376b8edb6aadcec460e803bc
[17/22] powerpc: Add KUAP support for BOOKE and 40x
        https://git.kernel.org/powerpc/c/43afcf8f0101279cf4243bb4f9f9b249ddd8613c
[18/22] powerpc/kuap: Wire-up KUAP on 44x
        https://git.kernel.org/powerpc/c/f6fad4fb55936f0d613cea08341d187d691d6440
[19/22] powerpc/kuap: Wire-up KUAP on 40x
        https://git.kernel.org/powerpc/c/fcf9bb6d32f8a268bc3daf3281e3beefabec4e7c
[20/22] powerpc/kuap: Wire-up KUAP on 85xx in 32 bits mode.
        https://git.kernel.org/powerpc/c/4f6a025201a290316b28a2a0ef9950398bd75088
[21/22] powerpc/kuap: Wire-up KUAP on book3e/64
        https://git.kernel.org/powerpc/c/57bc963837f5f1753a1d51fada54a32b8a84fdc3
[22/22] powerpc: Remove CONFIG_PPC_HAVE_KUAP and CONFIG_PPC_HAVE_KUEP
        https://git.kernel.org/powerpc/c/dede19be5163cdc5b5d65a2ce7e7f6eedcb666ff

cheers