linux-kernel - Re: [PATCH v1 1/6] powerpc/64e: Fix early TLB miss with KUAP

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Message-Id: <165693442393.9954.10279523167895642919.b4-ty@ellerman.id.au>
Date:   Mon, 04 Jul 2022 21:33:43 +1000
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@...roup.eu>, dja@...ens.net,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:     stable@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/6] powerpc/64e: Fix early TLB miss with KUAP

On Tue, 28 Jun 2022 16:48:54 +0200, Christophe Leroy wrote:
> With KUAP, the TLB miss handler bails out when an access to user
> memory is performed with a nul TID.
> 
> But the normal TLB miss routine which is only used early during boot
> does the check regardless for all memory areas, not only user memory.
> 
> By chance there is no early IO or vmalloc access, but when KASAN
> come we will start having early TLB misses.
> 
> [...]

Applied to powerpc/next.

[1/6] powerpc/64e: Fix early TLB miss with KUAP
      https://git.kernel.org/powerpc/c/09317643117ade87c03158341e87466413fa8f1a
[2/6] powerpc/64e: Remove MMU_FTR_USE_TLBRSRV and MMU_FTR_USE_PAIRED_MAS
      https://git.kernel.org/powerpc/c/3adfb457b84bd6de4e78a99814038fbd7205f253
[3/6] powerpc/64e: Remove unused REGION related macros
      https://git.kernel.org/powerpc/c/b646c1f7f43c13510d519e3044c87aa32352fc1f
[4/6] powerpc/64e: Move virtual memory closer to linear memory
      https://git.kernel.org/powerpc/c/128c1ea2f838d3031a1c475607860e4271a8e9dc
[5/6] powerpc/64e: Reorganise virtual memory
      https://git.kernel.org/powerpc/c/059c189389ebe9c4909d849d1a5f65c53115ca19
[6/6] powerpc/64e: KASAN Full support for BOOK3E/64
      https://git.kernel.org/powerpc/c/c7b9ed7c34a9f5dbf8222d63e3e313cef9f3150b

cheers