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Tue, 20 Aug 2024 15:25:14 +0100 Date: Tue, 20 Aug 2024 15:25:13 +0100 Message-ID: <86o75nxody.wl-maz@kernel.org> From: Marc Zyngier To: Sebastian Ene Cc: akpm@linux-foundation.org, alexghiti@rivosinc.com, ankita@nvidia.com, ardb@kernel.org, catalin.marinas@arm.com, christophe.leroy@csgroup.eu, james.morse@arm.com, vdonnefort@google.com, mark.rutland@arm.com, oliver.upton@linux.dev, rananta@google.com, ryan.roberts@arm.com, shahuang@redhat.com, suzuki.poulose@arm.com, will@kernel.org, yuzenghui@huawei.com, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kernel-team@android.com Subject: Re: [PATCH v8 3/6] arm64: ptdump: Use the mask from the state structure In-Reply-To: References: <20240816123906.3683425-1-sebastianene@google.com> <20240816123906.3683425-4-sebastianene@google.com> <86seuzxq27.wl-maz@kernel.org> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/29.4 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: sebastianene@google.com, akpm@linux-foundation.org, alexghiti@rivosinc.com, ankita@nvidia.com, ardb@kernel.org, catalin.marinas@arm.com, christophe.leroy@csgroup.eu, james.morse@arm.com, vdonnefort@google.com, mark.rutland@arm.com, oliver.upton@linux.dev, rananta@google.com, ryan.roberts@arm.com, shahuang@redhat.com, suzuki.poulose@arm.com, will@kernel.org, yuzenghui@huawei.com, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kernel-team@android.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240820_072518_146613_81607BB6 X-CRM114-Status: GOOD ( 38.78 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, 20 Aug 2024 15:13:27 +0100, Sebastian Ene wrote: > > On Tue, Aug 20, 2024 at 02:49:04PM +0100, Marc Zyngier wrote: > > On Fri, 16 Aug 2024 13:39:03 +0100, > > Sebastian Ene wrote: > > > > > > Printing the descriptor attributes requires accessing a mask which has a > > > different set of attributes for stage-2. In preparation for adding support > > > for the stage-2 pagetables dumping, use the mask from the local context > > > and not from the globally defined pg_level array. Store a pointer to > > > the pg_level array in the ptdump state structure. This will allow us to > > > extract the mask which is wrapped in the pg_level array and use it for > > > descriptor parsing in the note_page. > > > > > > Signed-off-by: Sebastian Ene > > > --- > > > arch/arm64/include/asm/ptdump.h | 1 + > > > arch/arm64/mm/ptdump.c | 13 ++++++++----- > > > 2 files changed, 9 insertions(+), 5 deletions(-) > > > > > > diff --git a/arch/arm64/include/asm/ptdump.h b/arch/arm64/include/asm/ptdump.h > > > index bd5d3ee3e8dc..71a7ed01153a 100644 > > > --- a/arch/arm64/include/asm/ptdump.h > > > +++ b/arch/arm64/include/asm/ptdump.h > > > @@ -44,6 +44,7 @@ struct ptdump_pg_level { > > > */ > > > struct ptdump_pg_state { > > > struct ptdump_state ptdump; > > > + struct ptdump_pg_level *pg_level; > > > struct seq_file *seq; > > > const struct addr_marker *marker; > > > const struct mm_struct *mm; > > > diff --git a/arch/arm64/mm/ptdump.c b/arch/arm64/mm/ptdump.c > > > index 404751fd30fe..ca53ef274a8b 100644 > > > --- a/arch/arm64/mm/ptdump.c > > > +++ b/arch/arm64/mm/ptdump.c > > > @@ -117,7 +117,7 @@ static const struct ptdump_prot_bits pte_bits[] = { > > > } > > > }; > > > > > > -static struct ptdump_pg_level pg_level[] __ro_after_init = { > > > +static struct ptdump_pg_level kernel_pg_levels[] __ro_after_init = { > > Hi Marc, > > > > Do you actually need this sort of renaming? Given that it is static, > > this looks like some slightly abusive repainting which isn't warranted > > here. > > I applied Will's suggestion from > https://lore.kernel.org/all/20240705111229.GB9231@willie-the-truck/ > > > > > > I also didn't understand the commit message: you're not tracking any > > mask here, but a page table level. You are also not using it for > > anything yet, see below. > > and I missed updating the commit message. > > > > > > > > { /* pgd */ > > > .name = "PGD", > > > .bits = pte_bits, > > > @@ -192,6 +192,7 @@ void note_page(struct ptdump_state *pt_st, unsigned long addr, int level, > > > u64 val) > > > { > > > struct ptdump_pg_state *st = container_of(pt_st, struct ptdump_pg_state, ptdump); > > > + struct ptdump_pg_level *pg_level = st->pg_level; > > > > This is what I mean. What is this pg_level used for? > > I make use of it to extract the name based on the level. The suggestion > that Will made allowed me to keep the code with less changes. Err, I see that now. It'd be good if you described what actually happens, because it is almost impossible to understand it from reading the patch. Thanks, M. -- Without deviation from the norm, progress is not possible.