kernel.git/arch/arm64/kvm/ptdump.c, branch master

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28Z

This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook

KVM: arm64: Teach ptdump about FEAT_XNX permissions

2025-12-01T08:43:47Z

Although KVM doesn't make direct use of the feature, guest hypervisors can use FEAT_XNX which influences the permissions of the shadow stage-2. Update ptdump to separately print the privileged and unprivileged execute permissions. Reviewed-by: Marc Zyngier Tested-by: Marc Zyngier Link: https://msgid.link/20251124190158.177318-5-oupton@kernel.org Signed-off-by: Oliver Upton

KVM: arm64: ptdump: Don't test PTE_VALID alongside other attributes

2025-09-08T19:01:21Z

The attribute masks and test values in the ptdump code are meant for individual attributes, however for stage-2 ptdump we included PTE_VALID while testing for R, W, X, and AF. This led to some confusion and the flipped output for the executable attribute. Remove PTE_VALID from all attribute masks and values so that each test matches only the relevant bits. Additionally, the executable attribute printing is updated to align with stage-1 ptdump, printing "NX" for non-executable regions and "x " for executable ones. Suggested-by: Anshuman Khandual Suggested-by: Mark Rutland Suggested-by: Sebastian Ene Signed-off-by: Wei-Lin Chang Acked-by: Will Deacon Reviewed-by: Anshuman Khandual Signed-off-by: Marc Zyngier

KVM: arm64: ptdump: Test PMD_TYPE_MASK for block mapping

2025-03-12T12:20:59Z

Test given page table entries against PMD_TYPE_SECT on PMD_TYPE_MASK mask bits for identifying block mappings in stage 2 page tables. Cc: Marc Zyngier Cc: Oliver Upton Cc: James Morse Cc: Will Deacon Cc: linux-arm-kernel@lists.infradead.org Cc: kvmarm@lists.linux.dev Cc: linux-kernel@vger.kernel.org Signed-off-by: Anshuman Khandual Acked-by: Marc Zyngier Reviewed-by: Ryan Roberts Link: https://lore.kernel.org/r/20250221044227.1145393-2-anshuman.khandual@arm.com Signed-off-by: Catalin Marinas

KVM: arm64: Register ptdump with debugfs on guest creation

2024-09-10T20:32:51Z

While arch/*/mem/ptdump handles the kernel pagetable dumping code, introduce KVM/ptdump to show the guest stage-2 pagetables. The separation is necessary because most of the definitions from the stage-2 pagetable reside in the KVM path and we will be invoking functionality specific to KVM. Introduce the PTDUMP_STAGE2_DEBUGFS config. When a guest is created, register a new file entry under the guest debugfs dir which allows userspace to show the contents of the guest stage-2 pagetables when accessed. [maz: moved function prototypes from kvm_host.h to kvm_mmu.h] Signed-off-by: Sebastian Ene Reviewed-by: Vincent Donnefort Link: https://lore.kernel.org/r/20240909124721.1672199-6-sebastianene@google.com Signed-off-by: Marc Zyngier