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Date: Thu, 30 Jan 2020 18:41:49 +0530 From: Anshuman Khandual <anshuman.khandual@....com> To: Gerald Schaefer <gerald.schaefer@...ibm.com> Cc: linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>, Vlastimil Babka <vbabka@...e.cz>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Thomas Gleixner <tglx@...utronix.de>, Mike Rapoport <rppt@...ux.vnet.ibm.com>, Jason Gunthorpe <jgg@...pe.ca>, Dan Williams <dan.j.williams@...el.com>, Peter Zijlstra <peterz@...radead.org>, Michal Hocko <mhocko@...nel.org>, Mark Rutland <mark.rutland@....com>, Mark Brown <broonie@...nel.org>, Steven Price <Steven.Price@....com>, Ard Biesheuvel <ard.biesheuvel@...aro.org>, Masahiro Yamada <yamada.masahiro@...ionext.com>, Kees Cook <keescook@...omium.org>, Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>, Matthew Wilcox <willy@...radead.org>, Sri Krishna chowdary <schowdary@...dia.com>, Dave Hansen <dave.hansen@...el.com>, Russell King - ARM Linux <linux@...linux.org.uk>, Michael Ellerman <mpe@...erman.id.au>, Paul Mackerras <paulus@...ba.org>, Martin Schwidefsky <schwidefsky@...ibm.com>, Heiko Carstens <heiko.carstens@...ibm.com>, "David S. Miller" <davem@...emloft.net>, Vineet Gupta <vgupta@...opsys.com>, James Hogan <jhogan@...nel.org>, Paul Burton <paul.burton@...s.com>, Ralf Baechle <ralf@...ux-mips.org>, "Kirill A . Shutemov" <kirill@...temov.name>, Christophe Leroy <christophe.leroy@....fr>, Ingo Molnar <mingo@...nel.org>, linux-snps-arc@...ts.infradead.org, linux-mips@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-ia64@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org, linux-sh@...r.kernel.org, sparclinux@...r.kernel.org, x86@...nel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH V12] mm/debug: Add tests validating architecture page table helpers On 01/30/2020 03:50 AM, Gerald Schaefer wrote: > On Tue, 28 Jan 2020 06:57:53 +0530 > Anshuman Khandual <anshuman.khandual@....com> wrote: > >> This adds tests which will validate architecture page table helpers and >> other accessors in their compliance with expected generic MM semantics. >> This will help various architectures in validating changes to existing >> page table helpers or addition of new ones. >> >> This test covers basic page table entry transformations including but not >> limited to old, young, dirty, clean, write, write protect etc at various >> level along with populating intermediate entries with next page table page >> and validating them. >> >> Test page table pages are allocated from system memory with required size >> and alignments. The mapped pfns at page table levels are derived from a >> real pfn representing a valid kernel text symbol. This test gets called >> right after page_alloc_init_late(). >> >> This gets build and run when CONFIG_DEBUG_VM_PGTABLE is selected along with >> CONFIG_VM_DEBUG. Architectures willing to subscribe this test also need to >> select CONFIG_ARCH_HAS_DEBUG_VM_PGTABLE which for now is limited to x86 and >> arm64. Going forward, other architectures too can enable this after fixing >> build or runtime problems (if any) with their page table helpers. >> >> Folks interested in making sure that a given platform's page table helpers >> conform to expected generic MM semantics should enable the above config >> which will just trigger this test during boot. Any non conformity here will >> be reported as an warning which would need to be fixed. This test will help >> catch any changes to the agreed upon semantics expected from generic MM and >> enable platforms to accommodate it thereafter. >> > > [...] > >> >> Tested-by: Christophe Leroy <christophe.leroy@....fr> #PPC32 > > Tested-by: Gerald Schaefer <gerald.schaefer@...ibm.com> # s390 Thanks for testing. > > Thanks again for this effort, and for keeping up the spirit against > all odds and even after 12 iterations :-) > >> >> diff --git a/Documentation/features/debug/debug-vm-pgtable/arch-support.txt b/Documentation/features/debug/debug-vm-pgtable/arch-support.txt >> new file mode 100644 >> index 000000000000..f3f8111edbe3 >> --- /dev/null >> +++ b/Documentation/features/debug/debug-vm-pgtable/arch-support.txt >> @@ -0,0 +1,35 @@ >> +# >> +# Feature name: debug-vm-pgtable >> +# Kconfig: ARCH_HAS_DEBUG_VM_PGTABLE >> +# description: arch supports pgtable tests for semantics compliance >> +# >> + ----------------------- >> + | arch |status| >> + ----------------------- >> + | alpha: | TODO | >> + | arc: | ok | >> + | arm: | TODO | >> + | arm64: | ok | >> + | c6x: | TODO | >> + | csky: | TODO | >> + | h8300: | TODO | >> + | hexagon: | TODO | >> + | ia64: | TODO | >> + | m68k: | TODO | >> + | microblaze: | TODO | >> + | mips: | TODO | >> + | nds32: | TODO | >> + | nios2: | TODO | >> + | openrisc: | TODO | >> + | parisc: | TODO | >> + | powerpc/32: | ok | >> + | powerpc/64: | TODO | >> + | riscv: | TODO | >> + | s390: | TODO | > > s390 is ok now, with my patches included in v5.5-rc1. So you can now add > > --- a/Documentation/features/debug/debug-vm-pgtable/arch-support.txt > +++ b/Documentation/features/debug/debug-vm-pgtable/arch-support.txt > @@ -25,7 +25,7 @@ > | powerpc/32: | ok | > | powerpc/64: | TODO | > | riscv: | TODO | > - | s390: | TODO | > + | s390: | ok | > | sh: | TODO | > | sparc: | TODO | > | um: | TODO | > --- a/arch/s390/Kconfig > +++ b/arch/s390/Kconfig > @@ -59,6 +59,7 @@ config KASAN_SHADOW_OFFSET > config S390 > def_bool y > select ARCH_BINFMT_ELF_STATE > + select ARCH_HAS_DEBUG_VM_PGTABLE > select ARCH_HAS_DEVMEM_IS_ALLOWED > select ARCH_HAS_ELF_RANDOMIZE > select ARCH_HAS_FORTIFY_SOURCE Sure, will add this up.
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