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From: Christophe Leroy <christophe.leroy@c-s.fr>
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: linux-kernel@vger.kernel.org, npiggin@gmail.com,
	linux-mm@kvack.org, Paul Mackerras <paulus@samba.org>,
	linuxppc-dev@lists.ozlabs.org, dja@axtens.net
Subject: Re: [PATCH v3 15/15] powerpc/32s: Activate CONFIG_VMAP_STACK
Date: Tue, 19 Nov 2019 18:23:10 +0100
Message-ID: <20191119182310.Horde.k9AYj80RSVXLkAUdXVQqrQ1@messagerie.si.c-s.fr> (raw)
In-Reply-To: <87v9rhcuc5.fsf@mpe.ellerman.id.au>

Michael Ellerman <mpe@ellerman.id.au> a écrit :

> Christophe Leroy <christophe.leroy@c-s.fr> writes:
>> A few changes to retrieve DAR and DSISR from struct regs
>> instead of retrieving them directly, as they may have
>> changed due to a TLB miss.
>>
>> Also modifies hash_page() and friends to work with virtual
>> data addresses instead of physical ones.
>>
>> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
>> ---
>>  arch/powerpc/kernel/entry_32.S         |  4 +++
>>  arch/powerpc/kernel/head_32.S          | 19 +++++++++++---
>>  arch/powerpc/kernel/head_32.h          |  4 ++-
>>  arch/powerpc/mm/book3s32/hash_low.S    | 46  
>> +++++++++++++++++++++-------------
>>  arch/powerpc/mm/book3s32/mmu.c         |  9 +++++--
>>  arch/powerpc/platforms/Kconfig.cputype |  2 ++
>>  6 files changed, 61 insertions(+), 23 deletions(-)
>
> If I build pmac32_defconfig with KVM enabled this causes a build break:
>
>   arch/powerpc/kernel/head_32.S: Assembler messages:
>   arch/powerpc/kernel/head_32.S:324: Error: attempt to move .org backwards
>   scripts/Makefile.build:357: recipe for target  
> 'arch/powerpc/kernel/head_32.o' failed
>   make[2]: *** [arch/powerpc/kernel/head_32.o] Error 1
>
> In the interests of getting the series merged I'm inclined to just make
> VMAP_STACK and KVM incompatible for now with:
>
> diff --git a/arch/powerpc/platforms/Kconfig.cputype  
> b/arch/powerpc/platforms/Kconfig.cputype
> index 15c9097dc4f7..5074fe77af40 100644
> --- a/arch/powerpc/platforms/Kconfig.cputype
> +++ b/arch/powerpc/platforms/Kconfig.cputype
> @@ -31,7 +31,7 @@ config PPC_BOOK3S_6xx
>         select PPC_HAVE_PMU_SUPPORT
>         select PPC_HAVE_KUEP
>         select PPC_HAVE_KUAP
> -       select HAVE_ARCH_VMAP_STACK
> +       select HAVE_ARCH_VMAP_STACK if !KVM_BOOK3S_32
>
>  config PPC_BOOK3S_601
>         bool "PowerPC 601"
>
>
> Thoughts?

Ok, lets do it the way you propose.

I'll look at this problem with KVM when I'm back next week.

Thanks
Christophe




  parent reply index

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-10  9:16 [PATCH v3 00/15] Enable CONFIG_VMAP_STACK on PPC32 Christophe Leroy
2019-09-10  9:16 ` [PATCH v3 01/15] powerpc/32: replace MTMSRD() by mtmsr Christophe Leroy
2019-09-10  9:16 ` [PATCH v3 02/15] powerpc/32: Add EXCEPTION_PROLOG_0 in head_32.h Christophe Leroy
2019-09-10  9:16 ` [PATCH v3 03/15] powerpc/32: save DEAR/DAR before calling handle_page_fault Christophe Leroy
2019-09-10  9:16 ` [PATCH v3 04/15] powerpc/32: move MSR_PR test into EXCEPTION_PROLOG_0 Christophe Leroy
2019-09-10  9:16 ` [PATCH v3 05/15] powerpc/32: add a macro to get and/or save DAR and DSISR on stack Christophe Leroy
2019-09-10  9:16 ` [PATCH v3 06/15] powerpc/32: prepare for CONFIG_VMAP_STACK Christophe Leroy
2019-10-17  7:36   ` Andrew Donnellan
2019-10-18  6:46     ` Christophe Leroy
2019-10-18  7:09       ` Andrew Donnellan
2019-09-10  9:16 ` [PATCH v3 07/15] powerpc: align stack to 2 * THREAD_SIZE with VMAP_STACK Christophe Leroy
2019-09-10  9:16 ` [PATCH v3 08/15] powerpc/32: Add early stack overflow detection with VMAP stack Christophe Leroy
2019-09-10  9:16 ` [PATCH v3 09/15] powerpc/8xx: Use alternative scratch registers in DTLB miss handler Christophe Leroy
2019-09-10  9:16 ` [PATCH v3 10/15] powerpc/8xx: drop exception entries for non-existing exceptions Christophe Leroy
2019-09-10  9:16 ` [PATCH v3 11/15] powerpc/8xx: move DataStoreTLBMiss perf handler Christophe Leroy
2019-09-10  9:16 ` [PATCH v3 12/15] powerpc/8xx: split breakpoint exception Christophe Leroy
2019-09-10  9:16 ` [PATCH v3 13/15] powerpc/8xx: Enable CONFIG_VMAP_STACK Christophe Leroy
2019-09-10  9:16 ` [PATCH v3 14/15] powerpc/32s: reorganise DSI handler Christophe Leroy
2019-09-10  9:16 ` [PATCH v3 15/15] powerpc/32s: Activate CONFIG_VMAP_STACK Christophe Leroy
2019-11-18 11:11   ` Michael Ellerman
2019-11-19  6:57     ` Michael Ellerman
2019-11-19 17:23     ` Christophe Leroy [this message]
2019-11-19  6:58   ` Michael Ellerman
2019-11-20  7:38     ` Christophe Leroy
2019-11-26  9:01     ` Christophe Leroy

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