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Tue, 20 Aug 2024 14:49:05 +0100 Date: Tue, 20 Aug 2024 14:49:04 +0100 Message-ID: <86seuzxq27.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: <20240816123906.3683425-4-sebastianene@google.com> References: <20240816123906.3683425-1-sebastianene@google.com> <20240816123906.3683425-4-sebastianene@google.com> 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_064910_362390_6D2D3ED0 X-CRM114-Status: GOOD ( 33.00 ) 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 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 = { 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 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. > { /* 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? > static const char units[] = "KMGTPE"; > u64 prot = 0; > > @@ -262,6 +263,7 @@ void ptdump_walk(struct seq_file *s, struct ptdump_info *info) > .seq = s, > .marker = info->markers, > .mm = info->mm, > + .pg_level = &kernel_pg_levels[0], > .level = -1, > .ptdump = { > .note_page = note_page, > @@ -279,10 +281,10 @@ static void __init ptdump_initialize(void) > { > unsigned i, j; > > - for (i = 0; i < ARRAY_SIZE(pg_level); i++) > - if (pg_level[i].bits) > - for (j = 0; j < pg_level[i].num; j++) > - pg_level[i].mask |= pg_level[i].bits[j].mask; > + for (i = 0; i < ARRAY_SIZE(kernel_pg_levels); i++) > + if (kernel_pg_levels[i].bits) > + for (j = 0; j < kernel_pg_levels[i].num; j++) > + kernel_pg_levels[i].mask |= kernel_pg_levels[i].bits[j].mask; > } > > static struct ptdump_info kernel_ptdump_info __ro_after_init = { > @@ -297,6 +299,7 @@ bool ptdump_check_wx(void) > { 0, NULL}, > { -1, NULL}, > }, > + .pg_level = &kernel_pg_levels[0], > .level = -1, > .check_wx = true, > .ptdump = { Thanks, M. -- Without deviation from the norm, progress is not possible.