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Wed, 01 Jul 2026 01:50:53 -0700 (PDT) Received: from wud.bbrouter ([2409:8a1e:9473:9f10:5de9:783b:c249:18c5]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-38097ba48d0sm550782a91.1.2026.07.01.01.50.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 01 Jul 2026 01:50:53 -0700 (PDT) From: "Dylan.Wu" To: palmer@dabbelt.com, pjw@kernel.org, aou@eecs.berkeley.edu, anup@brainfault.org Cc: alex@ghiti.fr, atish.patra@linux.dev, zhouquan@iscas.ac.cn, linux-riscv@lists.infradead.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, "Dylan.Wu" Subject: [PATCH 0/2] riscv: ptdump: Refactor for KVM gstage ptdump support Date: Wed, 1 Jul 2026 04:50:28 -0400 Message-Id: <20260701085030.124579-1-fredwudi0305@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This series refactors the RISC-V ptdump implementation to support dumping KVM gstage (stage-2) page tables via debugfs. Patch 1 moves the pagetable walking state and level definitions to a common header (arch/riscv/include/asm/ptdump.h), updates the attribute parsing logic to use per-level bit definitions, and exports note_page() so that it can be reused by the KVM ptdump implementation. Patch 2 introduces KVM gstage ptdump support, registering a 'gstage_page_tables' file under the guest debugfs directory. This allows userspace to inspect the gstage layout and permissions, which is useful for architectural debugging and memory management audits. Testing: - Booted on QEMU riscv64 with CONFIG_PTDUMP_DEBUGFS=y and CONFIG_PTDUMP_GSTAGE_DEBUGFS=y - Verified /sys/kernel/debug/kernel_page_tables output unchanged - Created a KVM guest and verified gstage_page_tables output: 0x0000000080200000-0x0000000080209000 0x000000010c94e000 36K PTE .. D A U X W R V 0x000000008020a000-0x0000000080223000 0x000000010c9af000 100K PTE .. D A U X W R V 0x0000000080229000-0x000000008022b000 0x000000010c978000 8K PTE .. D A U X W R V 0x000000008022d000-0x000000008022e000 0x000000010c844000 4K PTE .. D A U X W R V 0x000000008022f000-0x0000000080232000 0x000000010c846000 12K PTE .. D A U X W R V 0x0000000080234000-0x0000000080238000 0x000000010ca13000 16K PTE .. D A U X W R V 0x000000008023a000-0x000000008023f000 0x00000001083bd000 20K PTE .. D A U X W R V 0x0000000080242000-0x000000008024b000 0x0000000106975000 36K PTE .. D A U X W R V 0x000000008024d000-0x0000000080252000 0x000000010cb54000 20K PTE .. D A U X W R V 0x0000000080255000-0x0000000080258000 0x000000010c164000 12K PTE .. D A U X W R V 0x000000008025a000-0x000000008025c000 0x00000001036a9000 8K PTE .. D A U X W R V 0x0000000080260000-0x0000000080275000 0x0000000107917000 84K PTE .. D A U X W R V 0x0000000080276000-0x000000008027e000 0x00000001078ed000 32K PTE .. D A U X W R V 0x000000008027f000-0x00000000802bb000 0x0000000108986000 240K PTE .. D A U X W R V 0x00000000802bc000-0x00000000802c0000 0x000000010762b000 16K PTE .. D A U X W R V 0x00000000802c2000-0x00000000802d2000 0x00000001083fd000 64K PTE .. D A U X W R V 0x00000000802d4000-0x00000000802e0000 0x000000010790b000 48K PTE .. D A U X W R V 0x00000000802e1000-0x00000000802e4000 0x0000000102f74000 12K PTE .. D A U X W R V 0x00000000802e5000-0x00000000802ef000 0x0000000104b9c000 40K PTE .. D A U X W R V 0x00000000802f1000-0x00000000802f2000 0x0000000103778000 4K PTE .. D A U X W R V 0x00000000802f3000-0x00000000802f9000 0x000000010377a000 24K PTE .. D A U X W R V Dylan.Wu (2): riscv: ptdump: Move pagetable definitions to common header KVM: riscv: Register ptdump with debugfs on guest creation arch/riscv/include/asm/kvm_host.h | 6 + arch/riscv/include/asm/ptdump.h | 42 +++++++ arch/riscv/kvm/Kconfig | 15 +++ arch/riscv/kvm/Makefile | 1 + arch/riscv/kvm/ptdump.c | 178 ++++++++++++++++++++++++++++++ arch/riscv/kvm/vm.c | 5 + arch/riscv/mm/ptdump.c | 102 ++++++----------- 7 files changed, 282 insertions(+), 67 deletions(-) create mode 100644 arch/riscv/include/asm/ptdump.h create mode 100644 arch/riscv/kvm/ptdump.c -- 2.34.1